Analyzing the Fluid-Solid-Heat Coupled Mechanical Properties of Highly Porous Silicon Nitride Member Under High Mach Number
ZHANG Chen1, YING Guobing1, WANG Cheng1, WANG Pengju1, TIAN Baona1, HAN Jianxing2, WANG Xiang2
1 College of Mechanics and Materials, Hohai University, Nanjing 211100; 2 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
Abstract: The 40%, 45% and 50% (mass fractionm) solid content porous silicon nitrides with porosity of 65.24%, 63.26% and 61.19%, respectively, were successfully fabricated by gel-casting. And the gel-cast porous silicon nitride flight member with tangent pointed arch model was investigated by finite element analysis, using the property parameters as calculating data. The flow field was simulated by FLUENT software, and the fluid-solid-heat coupling analysis under different Mach number was conducted by ANSYS calculation. It was found that the tail connection end of the component was subjected to the maximum stress and exhibited serious instability. The stability of the component needed to be enhanced by strengthening the tail connection end. The pneumatic heat was the key to the instability of the component. It was revealed that an outside heat insulation layer was needed to protect the member under high Mach number. The porosity of porous silicon nitride material was in direct proportion to that of the Mach number at unstable situation. The thermal conductivity of porous silicon nitride was the key to the value of thermal stress under high Mach number.
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2017, Vol. 31 
