液体推进剂液滴高压蒸发研究

本文改进了现有的液体推进剂液滴高压蒸发模型,提出了一个计算高压下液滴蒸发时环境介质气体在液滴中溶解的子模型,该模型中采用了改进的R-K气体状态方程。利用本模型对丙烷在氮气中的高压蒸发进行了计算。结果表明在高压下液滴蒸发时间随压力和环境温度的增加而减小,当压力超过某临界值时,液滴将达到超临界状态。高压下环境介质气体在液滴中的溶解是非常明显的,并且压力愈高溶解性愈大,因此在推进剂高压燃烧中必须考虑溶解性对于液滴蒸发的影响。

A Study of Evaporation of Liquid Propellant Droplet under High Pressure

The existing models of evaporation of liquid propellant droplet under high pressurehave been modified by the authors. A submodel of solution of surrounding dielectric gasin droplet was developed to investigate the effect of solubility on evaporation under highpressure. A modified R-K equation of gas state was used in the model. Using the model,the evaporation of propane droplet in a nitrogen environment was simulated. It wasfound that the evaporation time of droplet decreases with the increasing of pressure andenvironment temperature and that the droplet will reach a supercritical state when thepressure is greater than a critical value. The solution of surrounding gas in droplet isvery obvious under high pressure, and the higher the pressure, the greater the solubility.So it is important to take the effect of the solution into account in high pressure combus-tion of propellant.