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

考虑了两种障碍物在狭窄通道上的流动畸变。它们是通常从通道壁上发出的射流和跨越在通道壁上的圆柱体。关于射流(1)分析----讨论了以下问题，即壁面附面层对射流穿过附面层的轨迹的影响；由射流引起的沿涡状流动的循环；气动壁面干涉效应和射流轨迹。计算结果与实验结果吻合较好。计算的环流与实验结果接近，特别是在低速比下。速度场的畸变可以用Biot-Savart定律，以及涡旋中心线和涡旋中心线上的环流来计算。计算得到的速度分布与实验结果定量吻合。(2)实验----注意事项a ..对射流撞击通道壁面所引起的类涡流以及类涡流与通道壁面的气动干涉效应所产生的三维流动进行了更多的研究。结果对最大速度沿射流中心线的变化、射流撞击点下游涡中心线的位置以及射流撞击的通道壁面上的流动模式有了新的认识。在圆柱体(1)实验上----考虑了由圆柱体引起的流动畸变、通道-壁面边界层和气动壁面干涉效应。用热线风速计测量速度矢量。由于壁面边界层厚度小，作为二次流的项链状涡并不清楚。结果表明，圆柱和壁面边界层存在干涉效应，特别是对横向速度分量的影响较为明显。进一步研究的主题是推导出项链状涡旋轨迹的经验表达式，并改进用于测量大波动速度矢量的热线技术。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