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首页> 外文会议>ASME TURBO EXPO >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：瓦楞涡轮机低压涡轮机冲击系统的数值模拟

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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：已经进行了详细的不稳定数值模拟，以研究1 + 1/2反向旋转涡轮机（差异反向旋转涡轮机（VCRT）中的低压（LP）转子中的冲击和不稳定流。通过分析VCRT中静压和马赫数等的分布，可以发现，当高压（HP）转子的外延延伸冲击（OES）从一个LP转子前缘移动到下一个时， LP转子的流入条件会有所不同。在该过程中，有两个典型的流入条件。一个是括号，但足够接近1.0，另一个略高于Unity，即，OES撞击LP转子前缘。 LP转子的这种流入条件将在不同时间导致两种不同的冲击系统。当OES在LP转子前缘撞击时，凸轮冲击出现在LP转子的上游，并且在LP转子的吸入表面上的大约70％的轴向弦中产生正常冲击，并且在弓形冲击和正常冲击之间产生存在组膨胀波。在OES扫描LP转子前缘即LP转子的流入后，LP转子上游的弓形冲击消失，并且正常震动，比上述较弱，在相同的位置产生，并且在前面产生正常冲击，存在一组膨胀波。这种震动在VCRT LP转子中的这种震动的分布类似于压缩机双圆弧（DCA）翼型级联，在相同的流入条件下，但在VCRT LP转子中，冲击被限制在通过的吸入表面侧它的强度较弱。 VCRT与DCA翼型级联之间的冲击系统差异的原因是，在级联中，在VCRT中，流动的流动是减压的。当HP转子的唤醒扫过LP转子时，LP转子的吸入表面上的静压将会波动，并且在抽吸表面上出现变分压面积，这将导致吸入表面上的透明不利的压力梯度在LP转子。

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