几种液体燃料指数蒸发率模型的实验研究

Experimental Study on Exponential Evaporation Rate Model of Several Liquid Fuels

燃烧室设计需要精确的气液两相质量传输关系,通过显微高速摄影测量了电加热炉中的悬挂液滴蒸发情况,得到了不同环境温度和气体组分条件下乙醇、煤油等五种液体燃料的定量蒸发率关系。经数据检验实验方法可行,最大相对误差不超过5%。实验数据对比表明,常用的两相质量传输规律在燃烧室工作温度范围内有明显偏差。提出指数蒸发率模型,航空煤油等燃料的模型值与实验值的标准差小于0.23。

Accurate gas-liquid two-phase mass transfer relationship is required for combustion chamber design. In this paper a micro high speed camera was adopted to measure the suspended droplet evaporation in an electrical heating furnace. The quantitative evaporation rate relationship of five kinds of liquid fuels,such as ethanol,kerosene etc. was obtained with various ambient temperature and gas phase component. The test method was verified by experimental data and the maximum relative error is less than 5%. The experimental data comparison showed that there is notable difference with the commonly used two phase mass transfer law in the combustion chamber working temperature range. In this paper,an exponential evaporation rate model was proposed. Compared with experimental values,the standard error（SE） of aviation kerosene and other fuels＇ model value is under 0.23. This model can be helpful for liquid fuel combustor design.