Experiments on the Merging Process and Interaction of the Leg Vortices within the Horseshoe Vortex

马蹄涡内腿部涡合并过程及相互作用的实验

• 批准号: 61550141
• 负责人: SHINJI HONAMI
• 金额: $ 1.15万
• 依托单位: Science University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550141/
• 关键词: Horseshoe Vortex; Three-Dimensional Structure of Vortex; Triple Hot-Wire Anemomter; Reynolds Stress, Turbulence Energy; 乱流エネルギ; 2次流れの圧力損失機構; 渦の三次元構造; 乱流運動エネルギ; 3線熱線流速計の検定

The research project includes the flow mesurements within the leg portion of the horseshoe vortex at a blade and endwall juction. An uncambered blade of constant thickness downstream of a half-circular nose of the idealized tuebine blade was installed at the flat plate with and without an anble of attack to the free-stream. The six components of the Reynolds stresses were mesured in addition to the tree mean velocity components at two cross-sectional planes by a fine teiple-wire probe. Total pressure losses was also measured by a cobra-type pitot probe. In case of the lower angls of attack, the predominant vortical motion of the secondary flow occurs at the corner of the blade and the endwall. The effect of the entrainment of the free-stream induced by the vortical motion on the Reynolds stress is founs. The diffusion of the Reynolds stresses is observed in the crosswise direction. Total pressure losses within the leg vortex are determined by the presominant vortical motion of the secondary flow. On the other hand, the turbulence energy is produced considerably in the leg vortex in case of the higher angle of attack, The distribution of the total pressure losses seems not to correspond to the vortical motion of the secondary flow in the leg vortex. This is the indication of the complicated flow mechanism bacause of the flow sepatation at the blade surface and detachment of the leg vortices from the blade base.

该研究项目包括在叶片和端壁连接处的马蹄涡腿部内的流量测量。在理想化的管状叶片的半圆形前端下游安装有厚度恒定的无弧形叶片，该叶片安装在平板上，具有或不具有对自由流的攻击能力。除了两个横截面的树平均速度分量之外，还通过细四线探针测量了雷诺应力的六个分量。总压力损失也通过眼镜蛇型皮托管进行测量。在攻角较低的情况下，二次流的主要涡旋运动发生在叶片和端壁的拐角处。旋涡运动引起的自由流夹带对雷诺应力的影响已被发现。在横向方向上观察到雷诺应力的扩散。腿部涡流内的总压力损失由二次流的主要涡旋运动决定。另一方面，在攻角较高的情况下，腿涡中会产生相当大的湍流能量，总压力损失的分布似乎与腿涡中二次流的涡旋运动不对应。这表明由于叶片表面的流动分离和腿涡与叶片基部的脱离而导致复杂的流动机制。

项目成果

Shinji HONAMI: ASME(to be presented at the 33rd ASME Gas Turbines and Aero Engine Congress,Amsterdam,June5-9,1988). 88-GT-197.

Shinji HONAMI：ASME（将于 1988 年 6 月 5 日至 9 日在阿姆斯特丹举行的第 33 届 ASME 燃气轮机和航空发动机大会上发表）。