论文部分内容阅读
为了选择合适的方法研究高金属含量发动机喷管内的高凝相浓度两相流,从理论研究和实验研究两个方面,总结了喷管两相流研究的进展,根据各种方法的研究结果,讨论了各方法对高凝相浓度喷管两相流研究的参考价值。发现实际流动介于两相平衡流和两相冻结流之间,在高凝相浓度喷管两相流中,颗粒含量高,两相间相互作用强,流动趋于等温,两相等温流模型适用于简化分析。两相流数值模型包括颗粒轨道模型和颗粒拟流体模型,两者均可用于高凝相浓度喷管两相流计算,轨道模型忽略颗粒体积,但能描述颗粒的运动变化过程,拟流体模型能得到颗粒参数在空间的分布。两相流实验研究主要用于验证数值计算的结果,并从实验获得颗粒粒径、颗粒阻力系数、Nu数等参数,以用于理论计算。采用理论和实验相结合的方法,分析颗粒或两相流场的某些局部特征,最终可推广到整个喷管内,从而大大减少实验难度。通过分析喷管两相流的研究进展,为高金属含量发动机内高凝相浓度喷管两相流的研究提供了参考。
In order to select the suitable method to study the high-coagulation phase concentration two-phase flow in high metal content engine nozzle, the progress of research on two-phase nozzle flow is summarized from the theoretical and experimental aspects. According to the results of various methods, The reference value of each method on the research of two-phase nozzle with high condensing phase concentration was discussed. It is found that the actual flow is between the two-phase equilibrium flow and the two-phase freezing flow. In the two-phase flow with high coagulation phase concentration, the particle content is high, the interaction between the two phases is strong, and the flow tends to be isothermal. To simplify the analysis. The two-phase flow numerical model includes particle trajectory model and particle simulating fluid model, both of which can be used for the calculation of two-phase flow in high-concentration phase concentration nozzle. The orbital model ignores the particle volume but describes the movement of particles. Get the distribution of particle parameters in space. Two-phase flow experimental study is mainly used to verify the numerical results, and from the experimental particle size, particle resistance coefficient, Nu number and other parameters for theoretical calculations. Using the combination of theory and experiment, the analysis of some local features of particle or two-phase flow field can be generalized to the whole nozzle, which can greatly reduce the experimental difficulty. By analyzing the research progress of nozzle two-phase flow, it provides a reference for the research on two-phase nozzle of high-concentration phase concentration nozzle in high-metal content engine.