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首页> 外文期刊>Journal of Aeronautics Astronautics and Aviation >IMPACTS OF TIP CLEARANCE SIZE VARIATION IN DIFFERENT ROTORS ON THE OVERALL PERFORMANCE AND UNSTEADY FLOW FIELDS IN A COUNTER-ROTATING AXIAL FLOW COMPRESSOR
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IMPACTS OF TIP CLEARANCE SIZE VARIATION IN DIFFERENT ROTORS ON THE OVERALL PERFORMANCE AND UNSTEADY FLOW FIELDS IN A COUNTER-ROTATING AXIAL FLOW COMPRESSOR

机译：反向旋转轴流压缩机中不同转子的尖端间隙尺寸变化对整体性能和非定常流场的影响

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摘要

The objective of current investigation is to study how the change of tip clearance size (TCS) in each of the two different rotors affects the compressor performance and the unsteady flow fields inside. It is found that the compressor stage performance is mainly dominated by the rear rotor. An increase of TCS in one rotor has no significant influence on the other rotor’s performance within a limited range of TCS. The pressure fluctuations in front rotor are dominated by the potential effects from downstream, while the oscillations in rear rotor are mainly caused by the unsteadiness of local tip leakage flow. Additionally, the pressure oscillating strength in one rotor is reduced obviously by the increased TCS in the other rotor. Frequency analysis indicates that the happening of periodical fluctuation in rear rotor is easier than that in front rotor and the frequency component of the strongest oscillation in rear rotor always appears in front rotor due to the potential effects. The pressure fluctuating components with lower frequency begin to happen in the corresponding rotor with TCS change when the TCS is increased to a large enough value for both rotors.
机译：当前研究的目的是研究两个不同转子中每个转子的叶尖间隙尺寸（TCS）的变化如何影响压缩机性能和内部的不稳定流场。发现压缩机级的性能主要由后转子决定。在有限的TCS范围内，一个转子的TCS的增加对另一转子的性能没有重大影响。前转子中的压力波动主要受下游的潜在影响，而后转子中的振荡主要由局部叶尖泄漏流的不稳定引起。另外，一个转子中的压力振荡强度由于另一转子中TCS的增加而明显降低。频率分析表明，后转子的周期性波动比前转子更容易发生，并且由于潜在的影响，后转子中最强振荡的频率分量总是出现在前转子中。当两个转子的TCS增加到足够大的值时，随着TCS的变化，相应的转子中开始出现较低频率的压力波动分量。

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