【摘要】 用数值计算的方法 ,以 k-ε双方程模型模拟蜗壳内的气体流动情况 ,以心形线拟合蜗壳的通流截面 ,用 SIMPL EST算法计算了 3种不同型线蜗壳其喷嘴出口气流角和速度的分布情况。这 3种型线分别为 :1)特征长度沿周向线性变化 ;2 )通流截面沿周向线性变化 ;3) Aθ/ rθ沿周向线性变化。对计算结果的比较表明 ,蜗壳型线的变化对喷嘴出口气流参数的分布会产生明显的影响。当 Aθ/ rθ沿周向线性变化时 ,喷嘴出口参数的分布最均匀。更多还原

【Abstract】 Numerical simulation of the three-dimensional turbulent flow field inside a turbocharger scroll using k-ε double-equation model is described.Cardioid is used to simulate the outline of the flow area of the cross section.The flow angle and velocity distributions at the scroll nozzle outlet with three different scroll outlines are calculated.The three outlines include:(1)character length a varying linearly around circumference;(2)area of cross section varying linearly around circumference;(3)A θ/r θ varying linearyly around circumference.The calculated results show that the scroll outline will distinctly influence the velocity distribution at the nozzle outlet.As A θ/r θ varying linearly around circumference,the velocity distribution is the most uniform.更多还原