摘要
对内嵌火箭发动机低压条件下的亚超剪切混合层中的燃油雾化特性进行研究,分析总结了环境压力、气液比、韦伯数对燃油雾化性能的影响。研究过程中采用ANSYS软件,使用了可有效捕捉漩涡的RNG k-ε模型并加入了TAB二次破碎模型,在0.01 MPa^0.1 MPa中改变环境压力,并通过改变燃油入口速度改变韦伯数和气液比。研究结果表明,随着环境压力降低,索泰尔平均直径增加,颗粒直径下降速度在接近常压时逐渐放缓,雾化性能下降;随着气液比的增加,索泰尔平均直径减小,颗粒分布更为均匀,提升了雾化性能;提高韦伯数使得气动力增加,索泰尔平均直径几乎呈线性趋势降低,提升了雾化性能。对数值模拟的数据进行分析,在低压条件下得到了索泰尔平均直径的经验计算模型。
A numerical study of spray characteristics of subsonic-supersonic mixing layer at low pressure is made.The effects of the parameters such as environmental pressure,air liquid ratio and We on the spray characteristics is analyzed and summed up.The RNG k-εmodel,which can capture the vortex effectively,is used with the ANSYS software in the research process,and the TAB secondary breaking model is added to the model.We and ALR can be changed by increasing the velocity of fuel.The range of air pressure is 0.01 MPa^0.1 MPa.The results show that the performance of the atomization is improved when the ALR and We is increased.The decrease of the air pressure makes the atomization characteristics lowering,as the distribution uniformity index value may be worse and the mean diameter is higher.Under the condition of the low pressure,the experimental model of the mean diameter is obtained for the calculation.
作者
宫冠吉
GONG Guanji(Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《机械制造与自动化》
2020年第3期67-70,共4页
Machine Building & Automation
