在收缩-扩张喷嘴中气粉流的理论研究

考虑粉粒体积分率对气粉两相流的影响建立了收缩-扩张喷嘴中气粉流的数学模型,这一模型由九个未知量U_p,T_p,U-g,T_g,α,P,ρ_g,M和A的一阶常微分方程组,以及相应的入口边界条件所构成。数值计算表明,在亚声速区中粉粒速度和气体速度的变化与粉气比无关,在超声速区中粉粒速度和气体速度均随粉气比的增大而减小;粉粒终速随粉粒粒径的减小而增大。

Theoretical Study on the Gas-Particle Flow Passing through Convergent-Divergent Nozzle

Considering influence of particle volume fraction on two phase flow,a mathematical model describing the behavior of gas-particle flow passing through convergent-divergent nozzle is developed. The model is constituted by a system of first-order ordinary differential equations including nine parameters, with corresponding boundary conditions at the inlet in nozzle. The numerical calculation results show that the variation of particle's velocities and gas velocities are independent of the ratio of mass flow rate of particles to total mass flow rate for subsonic flow region,but particle's velocities and gas velocities are increasing with the reduction of the ratio for supersonic flow region,and the particle's final velocities are increasing with the reduction of particle's size.