凝相粒子相变及微观传热对喷管内两相流动换热的影响规律研究

The heat transfer and solidification process between alumina condensate particles in the solid rocket motor nozzle gas and environment have impact on the two-phase flow process in the nozzle. The microscopic heat transfer models of the condensed particles were established, including the convective heat transfer, radiative heat transfer and liquid-solid phase change models between particles and environment. Besides, those heat transfer models were coupled with the one-dimensional non-equilibrium two-phase model of the nozzle to investigate the effects of phase transition and heat transfer of condensed particles on two-phase flows in the nozzle. The results show that the Drake model has the best accuracy for calculating the convective heat transfer. For condensed particles, the radiative heat transfer is far less than the convective heat transfer, with a contribution of 0.041%. When considering the liquid-solid phase transition of condensed particles, the outlet temperature of gas and particle phases are significantly higher while the outlet velocity is slightly higher than those without considering liquid-solid phase transition. At an inlet temperature 3000 K, the outlet temperature of gas and condensed particles is 25.5% and 26.7% higher than that without considering the phase transition, while the outlet velocity is 1.2% and 0.5% higher, respectively.