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狭窄航道的水流变形影响。它们是通常从槽壁进入横向流动的射流和跨越槽壁之间的圆柱体。关于射流(1)的分析-讨论了以下内容：壁面边界层对穿过边界层的射流轨迹的影响；射流撞击槽壁的轨迹；射流诱导的涡状流的环流；气动壁面干扰效应和射流的轨迹。计算的喷流轨迹和实验的喷流轨迹吻合得相当好。计算得到的环量与实验接近，特别是在低速比下。速度场的变形可以用毕奥-萨伐尔定律、涡中心线和沿它的环流来计算。计算得到的速度分布与实验结果基本吻合。(2)实验-关于…的思考更详细地讨论了三维流动，这既是由于射流撞击通道壁而产生的涡状流，也是由涡状流和通道壁引起的气动干扰效应的结果。这一结果对射流中心线上的最大速度变化、射流撞击点下游涡心位置以及射流撞击通道壁上的流态有了新的认识。在圆柱体(1)实验中，考虑了圆柱体引起的流动变形、通道壁面边界层和气动壁面干扰效应。速度矢量是用热线风速仪测量的。由于壁面边界层厚度较小，作为二次流的项链状涡并不明显。但计算结果表明，圆柱体和壁面边界层存在干扰效应，尤其是对横向速度分量有显著影响。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。较少

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