含高浓度悬浮固粒运动射流稳定性研究

首先用连续介质耦合模型推导出含高浓度悬浮固粒运动射流的空间稳定性方程,然后借助渐进分析法和欧拉守恒差分格式,用有限差分数值解法得到不同流向位置、流场雷诺数、固粒属性和喷射装置运动速度时流场的稳定性特征曲线,说明喷射装置的反向运动使不稳定扰动频率范围扩大,正向运动则相反。固粒抑制流场的不稳定性,随着固粒等效斯托克斯数的减小,这种效应增强。这些结论,对于两相运动射流发展的认识有重要意义。

Research on Stability of Moving Jet Containing Dense Suspended Solid Particles

The spatial stability equation of moving jet containing dense suspended solid particles was derived out by means of the continuum phase_coupled model. The stability curves of moving jet for different downstream distances, Reynolds number of flow_field, particle properties and velocities of jetting device are got by the finite difference method based on the asymptotic method and the Eulerian conservative difference scheme. Founded on the analyses of the obtained stability curves it is found that the positive velocity of jetting device widens the unstable frequency range of flow_field but the effect of the negative one is contrary. In addition, particles existing in the flow_field curb the instability of flow_field and the effect enhances with the decrease of Reynolds number of flow_field. These conclusions benefit learning the development of moving two_phase jet.