摘要
应用有限体积法及Baldwin-Lomax代数湍流模型求解叶轮机转子内流动的三维可压缩非定常薄层Navier-Stokes方程组,计算一个绕X轴等转速旋转的转子内流场问题,用当地时间步长方法来加速收敛。采用隐式算法对对流通量进行求解,而耗散通量采用显式算法。采用高阶TVD下的Roe格式计算对流通量,采用中心差分格式计算耗散通量。关于守恒变量Q的非线性方程组,采用牛顿迭代方法求解,线化后的方程用对称的Gauss-Seidle方法求其渐近解。应用该算法模拟了转子Rotor67流场,与试验做了大量的对比研究,包括性能、等马赫线以及总压和总温等。在最高效率点附近计算与试验比较接近,但在靠近失速点时计算与试验有较大的差别。
Three-dimension flow fields in the lobed mixer-ejector is numerically investigated, with main focus on vortical structures as well as vortical characteristics, to reveal further mechanism of the lobed mixer-ejector on enhanced mixing efficiency and pumping capacity. The results show that ： （ 1 ） the scale of streamwise vortices at the trailing edge of lobed nozzle is about the lobe height, the important contribution of the streamwise vortices for enhanced mixing occurs in downstream distance away from nozzle exit about one mixing duct diameter and then the intensity of streamwise vortices decays obviously; （2） the normal vortices take on lobed shape near the trailing edge of lobed nozzle, the normal vortices intensity decreases rapidly downstream, and have a little effect on enhanced mixing efficiency. These results are verified with the physics nature.
出处
《空气动力学学报》
CSCD
北大核心
2005年第3期350-354,359,共6页
Acta Aerodynamica Sinica
关键词
压气机
数值模拟
试验验证
旋转坐标系
lobed nozzle
mixer
numerical computation
stream-wise vortices
normal vortices
