ORCID Profile
0000-0001-6509-2469
Current Organisation
Iran University of Science and Technology
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Publisher: SAGE Publications
Date: 08-2009
Abstract: Designing a combustion chamber for a gas turbine engine requires expensive tests with many iterations. A numerical analysis can be employed to reduce the number of design iterations by providing an insight into the characteristics of the flow. This present article describes a three-dimensional numerical investigation of flow inside a model reverse-flow gas turbine combustor. In this computational work the entire model including the swirler has been selected for better accuracy. A finite volume non-staggered grid approach has been used and the pressure—velocity coupling is resolved using the SIMPLE algorithm. Comparisons are made between the standard k—ɛ turbulence model and the Reynolds stress turbulence model. Studies are performed to assess the velocity and pressure distributions at different locations in the combustor liner as well as the flow split through various holes on the liner surface. Overall, the predicted flow characteristics are found to be in reasonable agreement with the available experimental data.
Publisher: MDPI AG
Date: 15-05-2023
DOI: 10.3390/EN16104102
Abstract: In hot climates, PV efficiency drops dramatically if the surface temperature of the panels rises over a specific limit. Consequently, a cooling system is required to preserve PV modules as close to their operating temperature as feasible. For this purpose, the influence of an increase in PV surface temperature on PV performance was studied experimentally and numerically at the Research Institute of Petroleum Industry (RIPI) in July. The current study uses a cooling system consisting of rows of copper pipes connected to the PV backside. The experiments are conducted for four distinct scenarios, each with a different input fluid temperature ranging from 19.5 to 61 °C. The parametric analysis focuses on three influential factors: ambient temperature, solar radiation, and fluid inlet temperatures. In addition, other inputs are configured in accordance with the experimental conditions. The results showed that installing a cooling water system decreased the PV surface temperature from 60.20 °C to 40.24 °C at 9:00 am and from 73.98 °C to 73.33 °C at 1:30 pm. Furthermore, the electrical, thermal, overall, and exergy efficiencies drop as radiation intensity and water inlet temperature increase. In addition, the numerical results are validated with the experimental ones, and it shows high degrees of concordance.
Publisher: Springer Science and Business Media LLC
Date: 21-04-2015
Publisher: Informa UK Limited
Date: 07-2013
DOI: 10.1080/09593330.2013.777080
Abstract: Biodiesel, produced from plant and animal oils, is an important alternative to fossil fuels because, apart from dwindling supply, the latter are a major source of air pollution. In this investigation, effects of castor oil biodiesel blends have been examined on diesel engine performance and emissions. After producing castor methyl ester by the transesterification method and measuring its characteristics, the experiments were performed on a four cylinder, turbocharged, direct injection, diesel engine. Engine performance (power, torque, brake specific fuel consumption and thermal efficiency) and exhaust emissions were analysed at various engine speeds. All the tests were done under 75% full load. Furthermore, the volumetric blending ratios of biodiesel with conventional diesel fuel were set at 5, 10, 15, 20 and 30%. The results indicate that lower blends of biodiesel provide acceptable engine performance and even improve it. Meanwhile, exhaust emissions are much decreased. Finally, a 15% blend of castor oil-biodiesel was picked as the optimized blend of biodiesel-diesel. It was found that lower blends of castor biodiesel are an acceptable fuel alternative for the engine.
Location: Iran (Islamic Republic of)
No related grants have been discovered for Mohammad Hasan Shojaeefard.