横流均匀环境中有限长线源型扩散器正浮力射流近区特性预报

Prediction on Characteristics of Positive Buoyant Jets in Crossflow around Near Field of Finite Length Diffuser

应用标准ｋ－ε湍流模型和混合有限分析方法，对均匀横流中三维线源型扩散器的正浮力射流近区特性进行了预报，分析了不同工况的流速和温度在断面上的分布，得出射流轨迹线随Ｒ变化的表达式，并分析讨论了浮射流的分叉现象及浮力对射流轨迹线的影响．

The standard k ε\ turbulence model and hybrid finite analytic method (HFAM) are used to predict the characteristics of positive buoyant jets in crossflow.The buoyant jets are discharged from the finite length diffuser.The distributions of velocity and temperature at different cross sections are calculated.The relationship between trajectory of jets and velocity ratio R is given.The bifurcation of jets and buoyancy effect on trajectory of jets are analysed also.