An inlet distortion due to a vortexlike turbulent wake interfering aerodynamically with walls of a narrow channel as a gas-turbine one.

考虑了两种障碍物对窄缝通道流动畸变的影响。它们是从通道壁和横跨在通道壁之间的圆柱体正常地进入横流的射流。关于射流（1）分析--讨论了壁面边界层对穿过边界层的射流轨迹的影响;射流撞击通道壁面的轨迹;沿射流诱导的旋涡流沿着的环流;气动壁面干扰效应和射流轨迹。计算的和实验的射流轨迹一致相当好。计算的环量与实验结果接近，特别是在低流速比时。用毕奥-萨伐尔定律计算了速度场的畸变，以及涡中心线和沿中心线沿着的环量，计算的速度分布与实验结果吻合较好。(2)实验-注意事项a ...更多信息 在三维流场上进行了数值模拟，该三维流场是由射流冲击通道壁面引起的涡状流场以及涡状流场和通道壁面引起的气动干扰效应共同作用的结果。研究结果对最大速度沿着射流中心线的变化规律、射流冲击点下游涡中心线的位置以及射流冲击通道壁面的流动形态提供了新的认识.在圆柱上（1）实验-考虑了圆柱、通道壁面边界层和气动壁面干扰效应引起的流动畸变。用热线风速计测量速度矢量。由于壁面边界层厚度较小，作为二次流的项链涡不明显。但是，计算结果表明，圆柱和壁面边界层的干扰效应，特别是对横向速度分量的影响非常显著。进一步研究的课题是推导出项链状涡轨迹的经验表达式，并改进热线技术测量大波动的速度矢量。少

Considerations are made on the flow distortion resulting from two kinds of obstacle, which extends across a narrow channel. They are a jet issuing normally into a cross flow from a channel wall and a cylinder spanned between channel walls.1. On the jet (1) Analyses ---- The following are discussed, namely, effects of a wall boundary layer on a trajectory of the jet issuing across the boundary layer f a trajectory of the jet impinging on the channel wall ; a circulation along the vortexlike flow induced by the jet ; aerodynamic wall-interference effects and a trajectory of the jet. The calculated and experimental jet-trajectories agree fairly good. The calculated circulation is near experiments, especially at low velocity ratios. The distortion of the velocity field can be calculated using Biot-Savart's law, together with the vortex center line and the circulation along it. The calculated velocity distributions agree quontitatively with experiments. (2) Experiments ---- Considerations a … More re made on a three-dimensional flow, which results from both a vortexlike flow induced by the jet impinging on a channel wall and aerodynamic interference effects due to the vortexlike flow and the channel wall. The result gives new knowledges on a variation of the maximum velocity along the jet center line, a location of the vortex center line downstream of an impinging point of the jet, and a flow pattern on the channel wall, on which the jet impinges.2. On the cylinder (1) Experiments ---- The flow distortion due to the cylinder, a channel-wall boundary layer and aerodynamic wall-interference effects is considered. Velocity vectors are measured with the hot-wire anemometer. The necklacelike vortex as a secondary flow isn't clear, because of a small wall-boundary-layer thickness. However, the results reveal that there is the interference effects due to the cylinder and the wall boundary layer, especially the marked effects on the lateral velocity component. Topics for further investigation are to derive an empirical expression for trajectories of the necklacelike vortex and to improve a hot-wire technique for measurements of velocity vector with large fluctuations. Less