湍流空气射流引射特性的模拟研究  

MODELING STUDY ON THE ENTRAINMENT CHARACTERISTICS OF TURBULENT AIR JETS

作　　者：王海兴[1] 陈熙[2] 潘文霞[3] 

机构地区：[1]北京航空航天大学宇航学院,北京100083 [2]清华大学工程力学系,北京100084 [3]中国科学院力学研究所,北京100190

出　　处：《工程热物理学报》2008年第6期1025-1027,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.10772016，No.10575127)

摘　　要：本文采用数值模拟方法,研究了湍流空气射流对环境空气的引射特性,包括等温射流和非等温射流情形。结果表明,由于射流不停地引射环境空气,射流"势核"区下游的温度与轴向速度迅速降低;射流引射量的模拟结果与文献中报道的、采用多孔壁技术进行实验所建立的关联式良好符合。Modeling study is performed to reveal the special features of the entrainment of ambient air into turbulent air jets, Two different types of jet flows are considered, i,e. the isothermal and non-isothermal jets. It is found that due to the continuous entrainment of ambient air into the free jet, the temperature, axial velocity in downstream of the jet potential core rapidly decrease in the direction of jet axis, The modeling results concerning the jet entrainment rate agree well with those calculated by the experimental correlation built in the literature for the gas jet entrainment using a specially designed porous chamber technique.

关 键 词：湍流射流 引射 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TG402[动力工程及工程热物理—热能工程]