叶片式多相泵内部相态分离过程的研究

以韦伯数作为气泡稳定性的判断准则，从气泡稳定性的分析入手，研究分析了气泡在旋转叶轮间的运动规律，描述了叶轮间气泡的扩散流与分层流，并通过叶轮内气、液微元体的受力分析，研究了多相泵内部的相态分离过程及其影响因素．研究表明，周围流体对气泡有压力作用，这使气泡存在聚合的可能，而气泡的聚合必然导致相态分离的发生，叶轮内部相态分离过程的发生与其叶轮的旋转角速度和曲率半径有关．

PHASE SEPARATION INSIDE A ROTODYNAMIC MULTIPHASE PUMP

The stability of the motion of gas bubbles in impellers of rotodynamic multiphase pumps are discussed on the basis of Weber number, and the effects of dispersion or coalescence of the gas bubbles is described. The phase separation is studied with the analysis of the forces acting on fluid particles and gas particles in impellers. In the case of a multiphase flow in the pump impeller, the liquid carried phase will exert its pressure field on the bubbles with gas bubbles forming the dispersed phase and liquid as carried phase. This will results in a relative gas bubble motion which cause the bubbles to disperse or coalesce. The coalescence will result in the phase separation, which is related to the rotation characteristics, such as angular velocity, curvature of impellers.