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RISS 인기검색어
- 검색키워드
- 저자 : Hamed Jamshidi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Jamshidi, Hamed,Nilsson, Hakan,Chernoray, Valery Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.2
The efficiency of the ventilation system is a key point for durable and reliable electric generators. The design of such system requires a detailed understanding of the air flow in the generator. Computational fluid dynamics (CFD) has the potential to resolve the lack of information in this field. The present work analyses the air flow inside a generator model. The model is designed using a CFD-based approach, and manufactured by taking into consideration the experimental and numerical requirements and limitations. The emphasis is on the possibility to accurately predict and experimentally measure the flow distribution inside the stator channels. A major part of the work is focused on the design of an intake and a fan that gives an evenly distributed flow with a high flow rate. The intake also serves as an accurate flowmeter. Experimental results are presented, of the total volume flow rate, the total pressure and velocity distributions. Steady-state CFD simulations are performed using the FOAM-extend CFD toolbox. The simulations are based on the multiple rotating reference frames method. The results from the frozen rotor and mixing plane rotor-stator coupling approaches are compared. It is shown that the fan design provides a sufficient flow rate for the stator channels, which is not the case without the fan or with a previous fan design. The detailed experimental and numerical results show an excellent agreement, proving that the results reliable.
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Hamed Jamshidi,Håkan Nilsson,Valery Chernoray 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.2
The efficiency of the ventilation system is a key point for durable and reliable electric generators. The design of such system requires a detailed understanding of the air flow in the generator. Computational fluid dynamics (CFD) has the potential to resolve the lack of information in this field. The present work analyses the air flow inside a generator model. The model is designed using a CFD-based approach, and manufactured by taking into consideration the experimental and numerical requirements and limitations. The emphasis is on the possibility to accurately predict and experimentally measure the flow distribution inside the stator channels. A major part of the work is focused on the design of an intake and a fan that gives an evenly distributed flow with a high flow rate. The intake also serves as an accurate flowmeter. Experimental results are presented, of the total volume flow rate, the total pressure and velocity distributions. Steady-state CFD simulations are performed using the FOAM-extend CFD toolbox. The simulations are based on the multiple rotating reference frames method. The results from the frozen rotor and mixing plane rotor-stator coupling approaches are compared. It is shown that the fan design provides a sufficient flow rate for the stator channels, which is not the case without the fan or with a previous fan design. The detailed experimental and numerical results show an excellent agreement, proving that the results reliable.
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Marjan Rezaei,Hamed Jamshidi Aval 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
This study investigated the influence of non-isothermal aging (NIA) on microstructure, mechanical properties, and corrosionresistance of Al-Cu-Mg-Li alloy containing a Cu/Mg ratio of 1.0 and 3.8. The results show that NIA with a heating rate of10 °C/min results in maximum hardness 179.3 ± 2.3 HV and ultimate tensile strength 610.1 ± 21.5 MPa at a temperature of250 °C. Also, with increasing the Cu/Mg ratio from 1.0 to 3.8 in the alloy containing 0.75 wt% of lithium, the maximumhardness, and tensile strength increased by 35 and 45%, respectively. By increasing Cu/Mg ratio from 1.0 to 3.8 at alloycontaining 0.75 wt% of lithium, T1(Al2CuLi) precipitates are formed in the microstructure instead of δ′(Al3Li) precipitates. In the Cu/Mg ratio of 3.8, due to the more potential difference between the T1 precipitates and the aluminum base, the corrosionresistance of the alloy increases 76% higher than lithium-free alloy.
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Hossein Rostami,Salman Nourouzi,Hamed Jamshidi Aval 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
The aim of this investigation was to explore the effect of geometric tool parameters and tool probe offset on the properties of friction stir welded of 2 mm thick plates of Ti6Al4V to AA5052-H32 joints. In a probe offset distance of 0.5 mm, sound dissimilar joint with tensile strength higher than 94 % of the parent AA5052 alloy strength is produced. Increasing the probe offset distance result in more homogenous and higher quantity of titanium alloy particles in the weld nugget. Increasing welding heat input results in change of fracture zone from TMAZ of AA5052 side to weld interface. It was found that the tool with square frustum pin produces joints without defect and high strength compared to the cylindrical pin.
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