ORCID Profile
0000-0002-7620-9789
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Turbulent Flows | Interdisciplinary Engineering | Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels) | Energy Generation, Conversion and Storage Engineering | Functional Materials | Automotive Engineering | Materials Engineering | Heat and Mass Transfer Operations | Composite and Hybrid Materials |
Energy Conservation and Efficiency in Transport | Management of Greenhouse Gas Emissions from Transport Activities | Management of Gaseous Waste from Transport Activities (excl. Greenhouse Gases) | Urban and Industrial Air Quality | Management of Gaseous Waste from Energy Activities (excl. Greenhouse Gases) | Automotive Equipment | Industrial Energy Conservation and Efficiency | Management of Solid Waste from Energy Activities | Management of Greenhouse Gas Emissions from Energy Activities (excl. Electricity Generation) | Management of Greenhouse Gas Emissions from Electricity Generation | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Expanding Knowledge in Technology
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 06-2018
Publisher: Informa UK Limited
Date: 31-03-2021
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 02-2023
Publisher: MDPI AG
Date: 2020
DOI: 10.3390/APP10010318
Abstract: A numerical study of the fire whirl formation under symmetrical and asymmetrical entraining configuration is presented. This work aims to assess the effect of eddy-generation configuration on the evolution of the intriguing phenomenon coupled with both flow dynamics and combustion. The numerical framework implements large-eddy simulation, detailed chemistry to capture the sophisticated turbulence-chemistry interaction under reasonable computational cost. It also adopts liquid-based clean fuel with fixed injection rate and uniformed discretisation scheme to eliminate potential interference introduced by various aspects of uncertainties. The result reveals that the nascent fire whirl formulates significantly rapidly under the symmetrical two-slit configuration, with extended flame height and constrained vortex structure, compared with the asymmetrical baseline. However, its revolution orbit gradually erges from domain centreline and eventually stabilises with a large radius of rotation, whereas the revolution pattern of that from the baseline case is relatively unchanged from the inception of nascent fire whirl. Through the analysis, the observed difference in evaluation pathway could be explained using the concept of circular motion with constant centripetal force. This methodology showcases its feasibility to reveal and visualise the fundamental insight and facilitate profound understanding of the flaming behaviour to benefit both research and industrial sectors.
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1413
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1259
Publisher: SAE International
Date: 05-04-2016
DOI: 10.4271/2016-01-0857
Publisher: SAE International
Date: 09-2015
DOI: 10.4271/2015-01-1849
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0710
Publisher: SAGE Publications
Date: 06-08-2019
Abstract: This study shows the in-cylinder soot reduction mechanism associated with injection timing variation in a small-bore optical diesel engine. For the three selected injection timings, three optical-/laser-based imaging diagnostics were performed to show the development of high-temperature reaction and soot within the cylinder, which include OH* chemiluminescence, planar laser–induced fluorescence of hydroxyl and planar laser–induced incandescence. In addition, detailed soot morphology analysis was conducted using thermophoresis-based soot particle s ling from two locations within the piston bowl, and the subsequent analysis of transmission electron microscope (TEM) images of the s led soot aggregates was also conducted. The results suggest that when fuel injection timing is varied, ambient gas temperature makes a predominant effect on soot formation and oxidation. This is primarily combustion phasing effect as the advanced fuel injection moved the start of combustion closer to the top dead centre, and therefore, soot formation and oxidation occurred at elevated ambient gas temperature. There was an overall development pattern of in-cylinder soot consistently found for three injection timings of this study. The planar laser–induced incandescence images showed that a few small soot pockets first appear around the jet axis, which promptly grow into large soot regions behind the head of the flame marked planar laser–induced fluorescence of hydroxyl. The soot signals disappear due to significant oxidation induced by surrounding OH radicals. When the injection timing is advanced, the soot formation becomes higher as indicated by higher total laser–induced incandescence coverage, increased s led particle counts and larger and more stretched soot aggregate structures. However, soot oxidation is also enhanced under this elevated ambient temperature environment. At the most advanced injection timing of this study, the enhanced soot oxidation outperformed the increased soot formation with both peak laser–induced incandescence signal coverage and late-cycle coverage showing lower values than those of more retarded injection timings.
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 2015
Publisher: SAE International
Date: 17-10-2016
DOI: 10.4271/2016-01-2162
Publisher: SAE International
Date: 11-2014
DOI: 10.4271/2014-01-9079
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 07-2018
Publisher: SAE International
Date: 06-09-2015
DOI: 10.4271/2015-24-2444
Publisher: SAE International
Date: 06-09-2015
DOI: 10.4271/2015-24-2489
Publisher: Elsevier BV
Date: 2017
Publisher: American Society of Mechanical Engineers
Date: 06-05-2012
Abstract: Diesel knock is a phenomenon that generates undesirable noise and vibration that can be destructive to diesel engine structures and components for long-term operation. The diesel knock occurs when a large quantity of air-fuel is mixed prior to combustion when the ignition delay is long. This leads to a drastic pressure rise during the premixed phase of the combustion, which is followed by a pressure ringing. The main focus of this study is to examine effect of pilot injection on the pressure ringing and associated in-cylinder flame behaviour. In a single-cylinder small-bore optical engine, in-cylinder pressure measurement and high-speed imaging of the natural combustion luminosity have been performed. Results demonstrate that pilot injection helps reduce the in-cylinder pressure ringing by reducing the pressure rise rate of the main injection. Moreover, oscillation of the flames observed during the knocking events appears to diminish when the pilot injection is applied. How the pilot injection duration and timing affect the diesel knock behaviour is also discussed in detail.
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 08-2018
Publisher: SAE International
Date: 09-2015
DOI: 10.4271/2015-01-1852
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 04-2013
Publisher: SAGE Publications
Date: 17-01-2017
Publisher: Springer Science and Business Media LLC
Date: 05-2016
Publisher: MDPI AG
Date: 08-07-2022
Abstract: The increasing popularity of lithium-ion battery systems, particularly in electric vehicles and energy storage systems, has gained broad research interest regarding performance optimization, thermal stability, and fire safety. To enhance the battery thermal management system, a comprehensive investigation of the thermal behaviour and heat exchange process of battery systems is paramount. In this paper, a three-dimensional electro-thermal model coupled with fluid dynamics module was developed to comprehensively analyze the temperature distribution of battery packs and the heat carried away. The computational fluid dynamics (CFD) simulation results of the lumped battery model were validated and verified by considering natural ventilation speed and ambient temperature. In the artificial neural networks (ANN) model, the multilayer perceptron was applied to train the numerical outputs and optimal design of the battery setup, achieving a 1.9% decrease in maximum temperature and a 4.5% drop in temperature difference. The simulation results provide a practical compromise in optimizing the battery configuration and cooling efficiency, balancing the layout of the battery system, and safety performance. The present modelling framework demonstrates an innovative approach to utilizing high-fidelity electro-thermal/CFD numerical inputs for ANN optimization, potentially enhancing the state-of-art thermal management and reducing the risks of thermal runaway and fire outbreaks.
Publisher: Informa UK Limited
Date: 26-07-2022
Publisher: Elsevier BV
Date: 2023
Publisher: SAE International
Date: 30-08-2011
DOI: 10.4271/2011-01-1981
Publisher: Springer Science and Business Media LLC
Date: 03-07-2018
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 03-2020
Publisher: SAGE Publications
Date: 03-10-2020
Abstract: This study measures in-flame flow fields in a single-cylinder small-bore optical diesel engine using Flame Image Velocimetry (FIV) applied to high-speed soot luminosity movies. Three injection pressures were tested for a two-hole nozzle injector to cause jet-wall interaction and a significant jet-jet interaction within 45° inter-jet spacing. The high-pressure fuel jets were also under the strong influence of a swirl flow. For each test condition, soot luminosity signals were recorded at a high framing rate of 45 kHz with which the time-resolved, two-dimensional FIV post-processing was performed based on the image contrast variations associated with flame structure evolution and internal pattern change. A total of 100 combustion events for each injection pressure were recorded and processed to address the inherent cyclic variations. The ensemble-averaged flow fields were used for detailed flow structure discussion, and Reynolds decomposition using a spatial filtering method was applied to obtain high-frequency fluctuations that were found to be primarily turbulence. The detailed analysis of flow fields suggested that increased injection pressure leads to enhanced jet flow travelling along the bowl wall and higher flow vectors penetrating back towards the nozzle upon the impingement on the wall. Within the jet-jet interaction region, the flow vectors tend to follow the swirl direction, which increases with increasing injection pressure. The FIV also captured a turbulent ring vortex formed in the wall-jet head, which becomes larger and clearer at higher injection pressure. A vortex generated in the centre of combustion chamber was due to the swirl flow with its position being shifted at higher injection pressure. The bulk flow magnitude indicated significant cyclic variations, which increases with injection pressure. The turbulence intensity is also enhanced due to higher injection pressure, which primarily occurs in the wall-jet head region and the jet-jet interaction region.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2016
Publisher: American Chemical Society (ACS)
Date: 03-07-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 2017
Publisher: SAE International
Date: 19-08-2019
Publisher: Informa UK Limited
Date: 27-01-2021
Publisher: SAGE Publications
Date: 03-08-2022
DOI: 10.1177/14680874211037844
Abstract: This study performs endoscopic high-speed imaging to enhance the fundamental knowledge of in-cylinder flow structure and flame development process in a selected high-tumble production engine. The endoscopic high-speed particle image velocimetry (eHS-PIV) was performed for varied engine speeds and intake valve closing (IVC) timings to evaluate their impact on the in-cylinder flow structure in a motored engine condition. On another endoscope engine sharing the same hardware, high-speed flame imaging was conducted to visualise spark stretch and flame propagation. The flow and flame measurements were repeated for over 100 cycles and the ensemble-averaged results are compared. The eHS-PIV showed that a strong tumble vortex is generated during the piston compression with the flow directed towards the exhaust side. As the piston reaches top dead centre (TDC), however, a complex flow breakup involving multiple flow components occurs. This is followed by lateral flow vectors travelling back towards the intake side, which is termed as the bounce-back flow. For a tested engine speed range of 1700–2700 revolutions per minute (rpm), 2500 rpm shows the most significant bounce-back flow as a result of competition between the remaining exhaust-ward tumble flow strength and the newly formed bounce-back flow strength. At a retarded IVC timing, the flow loss leads to a weakened tumble flow and subsequently no bounce-back flow formation to maintain the exhaust-ward TDC flow direction. From the comparison between the flow results and spark/flame high-speed images, a strong positive correlation is found between the TDC flow direction and spark plasma stretch, and subsequently the flame propagation direction. The findings indicate that the TDC flow direction should be considered as a key parameter in the engine design and operating condition settings.
Publisher: MDPI AG
Date: 12-11-2019
DOI: 10.3390/APP9224842
Abstract: A paradigm shift towards the utilization of carbon-neutral and low emission fuels is necessary in the internal combustion engine industry to fulfil the carbon emission goals and future legislation requirements in many countries. Hydrogen as an energy carrier and main fuel is a promising option due to its carbon-free content, wide flammability limits and fast flame speeds. For spark-ignited internal combustion engines, utilizing hydrogen direct injection has been proven to achieve high engine power output and efficiency with low emissions. This review provides an overview of the current development and understanding of hydrogen use in internal combustion engines that are usually spark ignited, under various engine operation modes and strategies. This paper then proceeds to outline the gaps in current knowledge, along with better potential strategies and technologies that could be adopted for hydrogen direct injection in the context of compression-ignition engine applications—topics that have not yet been extensively explored to date with hydrogen but have shown advantages with compressed natural gas.
Publisher: Elsevier BV
Date: 06-2022
Publisher: American Chemical Society (ACS)
Date: 06-11-2013
DOI: 10.1021/EF401479S
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 2013
Publisher: SAGE Publications
Date: 20-06-2023
DOI: 10.1177/14680874231181960
Abstract: Three cylinder heads with varied intake port shapes are experimentally investigated to evaluate intake flow structures and their influence on near top dead centre (TDC) flow fields and turbulence distributions in a motored high-tumble engine. The endoscopic high-speed particle image velocimetry (eHS-PIV) is implemented in multi-cylinder engines with two laser endoscopes and a camera endoscope installed in the cylinder head. For a range of engine load and speed conditions, particle seeded and laser illuminated high-speed movies are recorded for 100 cycles with which ensemble-averaged flow fields and spatial-filtered high-frequency flow magnitude distributions are analysed. The results show that a straighter intake port producing a more lateral flow direction results in a larger swinging arc, which is related to enhanced flow later in the compression stroke. The tumble vortex shows an asymmetric structure the flow field during the compression stroke exhibits higher magnitude vectors at the leading head. This surging flow head becomes stronger with a straighter intake port, which leads to enhanced tumble vortex formation near TDC. As it becomes very strong, the flow vectors originally directed towards the exhaust valves bounce back towards the intake valves, causing a very complex flow structure involving multiple flow components. The result is enhanced turbulence throughout the late compression stroke including the spark timing. However, the impact of the straighter intake port shape on TDC turbulence becomes less significant at lower engine load and speed conditions as the lower intake air momentum limits the enhancement.
Publisher: Elsevier BV
Date: 06-2016
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0657
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 11-2017
Publisher: Begell House
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 16-04-2013
Publisher: Elsevier BV
Date: 06-2014
Publisher: Elsevier BV
Date: 2021
Publisher: SAE International
Date: 17-10-2016
DOI: 10.4271/2016-01-2303
Publisher: SAE International
Date: 03-04-2018
DOI: 10.4271/2018-01-1418
Publisher: SAE International
Date: 09-2015
DOI: 10.4271/2015-01-1991
Publisher: Elsevier BV
Date: 07-2013
Publisher: MDPI AG
Date: 24-09-2019
DOI: 10.3390/APP9193989
Abstract: This paper numerically examines the characterisation of fire whirl formulated under various entrainment conditions in an enclosed configuration. The numerical framework, integrating large eddy simulation and detailed chemistry, is constructed to assess the whirling flame behaviours. The proposed model constraints the convoluted coupling effects, e.g., the interrelation between combustion, flow dynamics and radiative feedback, thus focuses on assessing the impact on flame structure and flow behaviour solely attribute to the eddy-generation mechanisms. The baseline model is validated well against the experimental data. The data of the comparison case, with the introduction of additional flow channelling slit, is subsequently generated for comparison. The result suggests that, with the intensified circulation, the generated fire whirl increased by 9.42 % in peak flame temperature, 84.38 % in visible flame height, 6.81 % in axial velocity, and 46.14 % in velocity dominant region. The fire whirl core radius of the comparison case was well constrained within all monitored heights, whereas that of the baseline tended to disperse at 0.5 m height-above-burner. This study demonstrates that lified eddy generation via the additional flow channelling slit enhances the mixing of all reactant species and intensifies the combustion process, resulting in an elongated and converging whirling core of the reacting flow.
Publisher: Elsevier BV
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 28-01-2019
Publisher: Begell House
Date: 2011
Publisher: Elsevier BV
Date: 07-2019
Publisher: Springer Science and Business Media LLC
Date: 05-01-2018
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier BV
Date: 02-2019
Publisher: Springer Science and Business Media LLC
Date: 21-04-2015
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0742
Publisher: Elsevier BV
Date: 12-2019
Publisher: SAE International
Date: 03-04-2018
DOI: 10.4271/2018-01-0246
Publisher: American Chemical Society (ACS)
Date: 09-07-2018
No related organisations have been discovered for Sanghoon Kook.
Start Date: 2011
End Date: 07-2014
Amount: $92,245.00
Funder: Australian Research Council
View Funded ActivityStart Date: 11-2014
End Date: 08-2018
Amount: $240,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 09-2011
End Date: 02-2015
Amount: $310,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2015
End Date: 12-2017
Amount: $340,300.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 04-2016
Amount: $315,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2011
End Date: 11-2012
Amount: $600,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 11-2016
End Date: 03-2021
Amount: $240,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2018
End Date: 07-2023
Amount: $4,272,072.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 12-2019
Amount: $956,700.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 12-2023
Amount: $372,734.00
Funder: Australian Research Council
View Funded Activity