全耦合的一维两相喷管流的数值解

本文对控制方程组作了无因次处理,用龙格-库塔-基尔法进行了数值解。计算了五种粒度及两种微粒-气体质量流率比下微粒速度滞后及温度滞后;气相和凝相参数沿喷管长度的变化。分析讨论了所获得的结果,并简要地评论了几种一维两相喷管流模型。

NUMERICAL SOLUTION OF A FULLY-COUPLED MODEL OF ONE-DIMENSIONAL TWO-PHASE NOZZLE FLOW

A numerical method for calculating a fully-coupled model of one-dimensional two-phase nozzle flow is described in brief. Governing equations are derived. The Runge-Kutta-Gill method is adopted to solve the equations numerically. The solution for uniform acceleration of gas phase is utilized as an approximate solution for the dimensionless distance x*(=x/L) = 0 to 0.02,i.e.ug = ax*. The initial value of a is determined by a trial and error approach and then checked at the throat. The solution is continued to the throat where the conditions must be satisfied. To eliminate the singularity of the equation, a superseding variable is introduced. The computations are performed for velocity-lag as well as temperature-lag of five parsticle sizes and two ratios of particle to gas flow rates.Temperature, pressure and velocity distributions of both gas and particle along the length of the nozzle are also obtained.In addition, various modes of one-dimensional two-phase nozzle flow have also been briefly reviewed.