摘要
本文研究热激励器对超音速自由射流流动特性的影响,用S-A湍流模型得到马赫数为1.3的自由射流的准稳态流场,然后用LES方法模拟热激励器的热效应对射流流场不同区域的激励作用。文中讨论了持续式加热和脉动式加热对超音速剪切层涡发展的不同影响。前者通过提高局部区域温度,影响自由射流流场结构和超音速剪切层的涡结构;后者则通过凹槽内的脉动式热效应,产生压力扰动作用于主流场来改变涡的发展特性。
Thermal actuator can make difference in changing the flow characteristics of supersonic jet.The S-A turbulent model is applied to obtain the quasi-steady flowfield of a Mach 1.3 free jet,and large eddy simulation(LES) is used to simulate the thermal effect of the actuators on the free jet.The thermal actuator embedded in a groove is modeled by two heating patterns,steady heating and time-dependent heating using sine function.In the former pattern,the groove becomes high temperature and pressure region.The fluid inside the groove is entrained into the main stream,which affects the free jet and vortical structures.For the latter one,the heat source creates a high temperature region,causing the pressure wave with certain frequency to affect the characteristics of vortices in the main stream.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第10期1935-1938,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51176157)
关键词
热激励器
剪切层
超音速
自由射流
大涡模拟
thermal actuator
shear layer
supersonic flow
free jet
large eddy simulation
