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CHT/CFD Analysis of Thermal Sensitivity of a Transonic Film-Cooled Guide Vane

Computer Modeling in Engineering & Sciences 2019年第6期119卷 593-615页

作者： prasert prapamonthon Soemsak Yooyen Suwin Sleesongsom Department of Aeronautical Engineering International Academy of Aviation IndustryKing Mongkut’s Institute of Technology LadkrabangBangkok10520Thailand Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China

Thermal parameters are important variables that have great influence on life time of turbine ***,accurate prediction of the thermal parameters is *** this study,a numerical approach for conjugate heat transfer(CHT)and computational fluid dynamics(CFD)is used to investigate thermal sensitivity of a transonic guide vane which is fully film-cooled by 199 film *** barrier coating(TBC),i.e.,the typical TBC and a new one as the candidate TBC,and turbulence intensity(Tu),i.e.,Tu=3.3%,10%and 20%,are two variables used for the present *** first the external surface temperatures of the vane material are ***,the TBC surface temperatures are *** show the major role of the lower thermal conductivity of TBC which results in the lower and more uniform temperature on the external surface of the vane ***,the thermal sensitivity is presented in terms of the percentage reduction of the external surface temperatures of the vane material and the structural temperatures of the vane material at midspan,including the variations of average and maximum vane *** show that TBC and Tu have significant effects on the external surface and structural temperatures of the vane *** lower thermal conductivity of TBC leads to the higher difference between the thermal conductivity of the vane substrate and TBC,the reduction of heat transfer and the more uniform temperature within the vane *** results also show more effective protection for the average vane temperature from the two TBCs at higher ***,Tu does not significantly affect the reduction of the maximum vane temperature even though the new TBC,which has the very low thermal conductivity,is used.

关键词： Conjugate heat transfer film cooling thermal sensitivity

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Aerodynamic optimization using passive control devices near the bogie cabin of high-speed trains

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Acta Mechanica Sinica 2022年第9期38卷 48-63页

作者： Yongfang Yao Zhenxu Sun Guibo Li Guowei Yang prasert prapamonthon Yi Guo Mengying Wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing100049China China Railway Rolling Stock Corporation Qingdao Sifang Co. Ltd.Qingdao266111China International Academy of Aviation Industry King Mongkut’s Institute of Technology LadkrabangBangkok10520Thailand

Bogies are responsible for a significant amount of aerodynamic resistance and noise,both of which negatively affect high-speed train performance and passenger *** the present study,the passive control method is applied in designing the bogie cabins of a high-speed train to improve its aerodynamic *** passive control measures are introduced,namely,adding a spoiler and creating diversion grooves near the bogie ***,the aerodynamic and aeroacoustic characteristics of a high-speed train operating at 350 km/h under different control strategies are numerically investigated using the improved-delayed-detached-eddy simulation(IDDES)and the acoustic finite element method(FEM).The impacts of passive control devices on drag reduction,slipstream,and aerodynamic noise are presented and *** results reveal that the passive control devices have a major effect on the slipstream around the *** amplitude of the fluctuating pressure is higher in the first half of the train than in the second *** first bogie has the maximum amplitude of the acoustic pressure for both the train with and without passive *** the far field,the spoiler installation and placement of the diversion grooves in the front of the bogie cabin can significantly reduce aerodynamic drag and ***,as shown in this study,using passive control methods to improve the aerodynamic and aeroacoustic properties of high-speed trains can be a viable option.

关键词： Passive control devices Aerodynamic drag Slipstream Aerodynamic noise High-speed trains

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