排放角度对平面负浮力射流的影响及射流远区特性分析

Influence of injection anlges on planar negatively buoyant jets and characteristic analysis of far-field flow

采用κ-ε湍流模型和混合有限分析算法,对静止环境中多排放角度的平面负浮力射流进行了数值模拟,分析了射流角度和出口密度弗汝德数对负浮力射流特征量的影响,给出了考虑排放角度的最大上升高度计算公式.分析了垂直射流的远区特性,高密度流体以异重流形式向下游流动.

The κ-ε turbulent model is used to obtain a mathematical model of turbulent, planar dense jets. The hybrid finite analytic method and a stagger grid are used to calculate the whole field of this flow pattern. A new equation is given to predict the maximum penetration of planar dense jets with different injection angles and initial densimetric Froude number .Calculation of the far-field behavior indicated that the denseness flow is the main form of the far-field flow. The shape of the denseness flow head and velocity distribution on section are analyzed.