Experimental and Numerical Study on Phase Change Transpiration Cooling for a Wedge-shaped Nose Cone with a Gradient Porosity Layout
In order to improve the transpiration cooling efficiency at the stagnation point of the nose cone of the near space vehicle,a wedge-shaped porous nose cone with a gradient porosity layout is proposed and the phase change transpiration cooling is experimentally and numerically investigated under different coolant injection ratio.The experimental results indicate that the gradient porosity layout can effectively improve the cooling efficiency at the stagnation point and the overall temperature uniformity of the porous surface.When the coolant injection ratio M is 0.125%,the cooling efficiency at the stagnation point is increased by 52.4%,and the overall cooling efficiency is increased by 31.7%.The numerical results indicate that the gradient porosity layout increases the coolant mass flux at the leading edge and optimizes coolant distribution by moving the maximum pressure value at the stagnation point downstream.When the coolant injection ratio M=0.15%,the coolant mass flux at the stagnation point is increased 76%.In addition,the film formed by the coolant flows out of the porous structure is more uniform.
active thermal protectiontranspiration coolingporous medialiquid-gas phase changethermal protection
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