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首页> 外文期刊>Journal of the Aeronautical Society of India >COMPUTATIONAL INVESTIGATION OF EFFECT OF CASING WALL MOTION ON FLOW AND LOSSES IN AN ANNULAR TURBINE ROTOR IMPULSE CASCADE
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COMPUTATIONAL INVESTIGATION OF EFFECT OF CASING WALL MOTION ON FLOW AND LOSSES IN AN ANNULAR TURBINE ROTOR IMPULSE CASCADE

机译：套管壁运动对环形涡轮转子脉冲级联流动和损失影响的计算研究

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摘要

The present paper presents computational results of effect of casing wall motion on three dimensional flow and losses in an annular turbine rotor impulse cascade. The flow at the inlet of the rotor cascade is radially non uniform, which is simulated by means of an upstream nozzle blade row. Commercial CFD software is used for the computations. No slip condition is used for the case of stationary casing, whereas relative wall condition is used for the case of rotating casing. Streamlines, velocity vectors, contours of static pressure on blade tip, contours of total loss coefficient at blade exit, spanwise variation of lift coefficient, circumferentially averaged flow angles and total pressure loss coefficient and axial variation of mass averaged total pressure loss coefficient are presented for both cases. There are minor differences in the spanwise variation of various parameters for both cases. The casing wall motion reduces the losses in the region near to casing but increases in the region far away from the casing. The blade loading and lift coefficient are increased with increase in casing wall motion near the casing and reduced away from the casing. The casing motion causes a slight reduction of losses associated directly with the leakage vortex. However total losses remain nearly same.
机译：本文提出了在环形涡轮转子冲激级联中，套管壁运动对三维流动和损失的影响的计算结果。转子叶栅入口处的流动在径向上是不均匀的，这是通过上游喷嘴叶片行模拟的。商业CFD软件用于计算。对于固定式外壳，不使用打滑条件，而对于旋转式外壳，则使用相对壁条件。给出了流线，速度矢量，叶片尖端静压力的轮廓，叶片出口处总损耗系数的轮廓，升力系数的翼展方向变化，周向平均流角和总压力损失系数以及质量平均总压力损失系数的轴向变化两种情况。在两种情况下，各个参数的跨度变化均存在细微差异。套管壁的运动减少了靠近套管的区域中的损失，但在远离套管的区域中的损失增加了。叶片的载荷和升力系数随着在壳体附近的壳体壁运动的增加而增加，并且在远离壳体的情况下减小。套管运动导致与涡旋涡流直接相关的损失略有减少。但是总损失几乎保持不变。

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