Coupled Numerical Simulation of Transpiration Cooling With Phase Change in the Porous Plate
Transpiration cooling in two-dimensional porous plate under hypersonic flow has been numerically investigated.The numerical model considers the complex interaction between the hy-personic mainstream region and porous medium region.The simulations are performed at Mach number 6.47.The liquid water is adopted as the coolant.The effects of the injection rates,the par-ticle diameter,porosity and properties of porous material on transpiration cooling performance are analyzed.The simulation results show that the average cooling efficiency of porous plate increases from 0.41 to 0.87 when the injection rate varies from 0.0159％to 0.0795％.It also can be found that the effects of particle diameter and porosity of porous plate on transpiration cooling efficiency are marginal.The influence of particle diameter on transpiration cooling efficiency becomes weaker at higher injection rate.Such as,the temperature profiles of porous plate for different particle diame-ters are almost the same when the injection rate is 0.0795％.Furthermore,the thermal conductivity of porous material has marginal effect on the averaged cooling efficiency of porous plate;however,the greater temperature difference between the two ends in the porous plate can be obtained at a smaller thermal conductivity.
NETL
NSTL
万方数据
