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检索条件"主题词=acoustic cavity"

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Validation of Air cavity for Vehicle

Validation of Air Cavity for Vehicle

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2015中国汽车工程学会年会

作者： Yang Zhong Mo Liqiong Lifan Automobile Research Institue LIFAN INDUSTRY（GROUP）.LTD

In this study,passive noise analysis in low frequency range in carbon was discussed Firstly,the simple rectangular box air cavity model was created and analysed,using ANSYS,VAONE,Actran and Hypermesh with Nastran,which was to do a comparison of the computational results to the theoretical ***,the real air cavity of a car was generated by using the software that was proved,as more accurate,by the simple rectangular box air cavity analysis,meanwhile,the results were also discussed in this paper.

关键词： rectangular box cavity acoustic cavity Hypermesh Nastran ANASYS

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Numerical Study on Combined Thermal Protection System of the Hypersonic Vehicle

Numerical Study on Combined Thermal Protection System of the...

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2023智能制造与机械动力学学术大会

作者： Xin Sheng Xi Lu Jianrun Zhang School of Mechanical Engineering Southeast University

With the view to satisfy rapid developments of the modern aerospace and military demands,high flight velocity has become a crucial specification in the design process of hypersonic ***,thermal problems caused by severe aerodynamic heating cannot be omitted with the increase of Mach *** strong aerodynamic heating caused by high heat flux on nose and body at the windward leading edge of the aircraft brings the main problem in the aerodynamic layout *** thermal protection systems are usually categorized into passive and active *** on the ultimate temperature of traditional heat protection materials elevate slowly and the passive methods are unable to suffer from the continuous high heat *** methods(*** spike,energy deposition,transpiration cooling,film cooling and directed injection of coolant gas,etc.)utilize flow control technologies to achieve the aim of decreasing heat flux by changing the flow field structure,but their respective disadvantages still *** this paper,we focus on the active methods including opposing jet,acoustic cavity and their combined thermal protection *** drag reduction and thermal protection effects are discussed,*** jet has almost same effect of heat reduction at nose region as the method with mechanical spike,which forms a Mach disk to balance the pressure of jet with the pressure behind the detached shock *** substituting opposing jet omits the worry to the spike *** free steam lets the jet layer reattach to body surface,then recirculation region is formed around the nozzle exit and recompression shock wave is formed near the reattachment of the jet *** the pressure ratio is increased,the heat flux is decreased at each *** remarkable reduction of aerodynamic heating is also observed in nose ***,the porous opposing jet method that a blunt body attaches with uniformly 30°distributed nozzles is also *** prote

关键词： numerical simulation opposing jet acoustic cavity hypersonic vehicle

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