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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >NUMERICAL SIMULATION OF SHOCK SYSTEMS OF LOW PRESSURE TURBINE IN VANELESS COUNTER-ROTATING TURBINE
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NUMERICAL SIMULATION OF SHOCK SYSTEMS OF LOW PRESSURE TURBINE IN VANELESS COUNTER-ROTATING TURBINE

机译：无刷反向旋转涡轮中低压涡轮激波系统的数值模拟

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摘要

A detailed unsteady numerical simulation has been carried out to investigate the shock and unsteady flow in the low pressure (LP) rotor in a 1+1/2 counter-rotating turbine (vaneless counter-rotating turbine (VCRT)). Through analyzing the distribution of static pressure and Mach number etc. in the VCRT, it can be found that, when the outer-extending shock (OES) of high pressure (HP) rotor moving from one LP rotor leading edge into the next, the inflow condition of LP rotor will vary. In the process, there are two typical inflow conditions. One is subsonic, but sufficiently near 1.0, and the other is slightly above unity i.e. the OES impinges on the LP rotor leading edge. Such inflow conditions of LP rotor will result in two different shock systems at different time. When the OES impinges on the LP rotor leading edge, a bow shock appears upstream of the LP rotor, and a normal shock produces at roughly 70% axial chord on the suction surface of LP rotor, and between the bow shock and normal shock, a group of expansion waves exist. After the OES sweeps the LP rotor leading edge i.e. the inflow of LP rotor is subsonic, the bow shock upstream of the LP rotor disappears, and a normal shock, that is weaker than the above, produces at the same location, and in front of the normal shock, a group of expansion waves exist. This distribution of shock in the VCRT LP rotor is similar to that in a compressor double-circular-arc (DCA) airfoil cascade in the same inflow condition, but in the VCRT LP rotor, the shocks are confined to the suction surface side of passage and its intensity weaker. The reason of the difference of the shock systems between the VCRT and the DCA airfoil cascade is that in the cascade the flow is of pressurization while in the VCRT the flow is of decompression. When the wake of the HP rotor sweeps the LP rotor, the static pressure on the suction surface of LP rotor will fluctuate, and a variational lower pressure area appears on the suction surface, which will result in a clear adverse pressure gradient on the suction surface in the LP rotor.
机译：已经进行了详细的非稳态数值模拟，以研究1 + 1/2反向旋转涡轮机（无叶反向旋转涡轮机（VCRT））中低压（LP）转子中的冲击和非恒定流。通过分析VCRT中的静压和马赫数等的分布，可以发现，当高压（HP）转子的外伸冲击（OES）从一个LP转子前缘移动到另一个时，低压转子的流入条件会有所不同。在此过程中，有两种典型的流入条件。一个是亚音速的，但足够接近1.0，另一个则略高于1，即OES撞击LP转子的前缘。低压转子的这种流入条件将导致在不同时间产生两个不同的冲击系统。当OES撞击LP转子的前缘时，在LP转子的上游会出现弓形冲击，在LP转子的吸力表面上大约70％的轴向弦会产生法向冲击，在弓形冲击和法向冲击之间，存在着一组膨胀波。在OES扫过LP转子的前缘后，即LP转子的流入是亚音速的，LP转子上游的弓形冲击消失了，并且在上述位置的同一位置和前面产生了比上述弱的正常冲击。在正常的冲击中，存在着一组膨胀波。 VCRT LP转子中的冲击分布与在相同流入条件下的压缩机双圆弧（DCA）翼型叶栅中的分布相似，但在VCRT LP转子中，冲击被限制在通道的吸入表面侧其强度较弱。 VCRT和DCA机翼级联之间的冲击系统不同的原因是，在级联中，流动是增压的，而在VCRT中，流动是减压的。当高压转子的尾流扫过低压转子时，低压转子的吸力表面上的静压力会波动，并且吸力表面上会出现变化的低压区域，这将导致吸力表面上明显出现不利的压力梯度在低压转子中。

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