高焓可压缩流动热辐射颗粒两相流理论分析

从理论上推导了弥散热辐射颗粒与可压缩流动的耦合方程,发现弥散颗粒与携带流体的相间传热系数与马赫数平方成正比。极端高温下,弥散颗粒相与携带流体相的对流传热是单向的,即等温颗粒不断通过对流作用传热给流体,但对流作用无法冷却高温热辐射颗粒。通过考察均匀流中缩核效应对惯性颗粒动力学的影响,发现质量损失会诱导颗粒惯性参数发生变化,从而改变颗粒的非定常速度曲线。

Theoretical Analysis on the High Enthalpy Radiation ParticleLaden Compressible Flow

The theoretical equations of particle laden compressible flow by taking into account of heat radiation and convection were derived. It is found that, the heat exchange between dispersed phase and carried fluid phase is proportional to square of Mach number. In extreme high temperature environment, the convective heat transfer between two phases is one way, which means that the isothermal particle transfers the heat into the fluid, but the fluid can not cool down the radiation-heated particle via convection. In addition, the effect of shrinking core on the particle dynamics was investigated. The shrinking core effect modifies the Stokes number of particle, therefore the time evolution of unsteady velocity of particle from rest to terminal state in a uniform flow was altered.