摘要
本文以超音速氧气射流为研究对象,采用温度修正的k-ε湍流模型,对氧气射流在不同环境温度下的引射行为进行数值模拟研究.通过对模拟结果与文献中试验结果的比较发现温度修正的k-ε模型能够准确预测高温环境中射流行为.射流引射行为的模拟结果表明:环境温度对湍流射流的引射行为有很大的影响,在标准大气压下,随着环境温度的升高,射流引射率降低.与此同时,室温下的模拟结果符合经验公式,而在高温气体环境中,温度对湍流混合增长速率的影响不可忽略,随着环境温度的升高,环境气体密度和湍流混合增长速率均减小,从而使射流引射率降低并逐渐偏离室温下得到的经验公式.
In this paper, the temperature modified k-c turbulence model is used to simulate the entrainment of the supersonic oxygen jet at different ambient temperatures. The comparison between simulation results and the experimental data in the literature shows the temperature modified k-c turbulence model can accurately predict the jet behavior in high-temperature environment. The simulation results of the jet entrainment show that the ambient temperature has a great influence on the behavior of turbulent jet entrainment, and the entrainment rate of the turbulent jet decreases as the ambient temperature rises. Meanwhile, the simulation results at room temperature is consistent with the empirical formula. The effect of temperature on the growth rate of turbulent mixing cannot be ignored in a high temperature environment. In addition, both the density of ambient gas and the growth rate of turbulent mixing reduce with increasing the ambient temperature, and then the calculated entrainment rate of the turbulent jet gradually deviated from the obtained empirical formula at room temperature.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第3期545-549,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目(No.51034008)
关键词
环境温度
湍流
引射
数值模拟
ambient temperature
turbulence
entrainment
numerical simulation
