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首页> 外文期刊>Journal of turbomachinery >Investigation of Pre-Stall Behavior in an Axial Compressor Rotor-Part I: Unsteadiness of Tip Clearance Flow
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Investigation of Pre-Stall Behavior in an Axial Compressor Rotor-Part I: Unsteadiness of Tip Clearance Flow

机译：轴流压气机转子失速行为的研究-第一部分：叶尖间隙流动的不稳定性

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摘要

To investigate the pre-stall behavior of an axial flow compressor rotor, which was experimentally observed with spike-type stall inception, systematic experimental and wholepassage simulations were laid out to analyze the internal flow fields in the test rotor. In this part, emphases were put on the analyses of experimental results and the predicted results from steady simulations and unsteady simulations, which converged to equilibrium solutions with nearly periodic fluctuations of efficiency. The objective was to uncover the unsteady behavior of tip clearance flow and its associated flow mechanism at near-stall conditions. To validate the steady simulation results, the predicted total characteristics and spanwise distributions of aerodynamic parameters were first compared with the measured steady data, and a good agreement was achieved. Then, the numerically obtained unsteady flow fields during one period of efficiency fluctuations were analyzed in detail. The instantaneous flow structure near casing showed that tip secondary vortex (TSV), which appeared in the previous unsteady single-passage simulations, did exist in tip flow fields of whole-passage simulations. The cyclical motion of this vortex was the main source of the nearly periodic variation of efficiency. The simulated active period of TSV increased when the mass flow rate decreased. The simulated frequency of TSV at flow condition very close to the measured stall point equaled the frequency of the characteristic hump identified from the instantaneous casing pressure measurements. This coincidence implied that the occurrence of this hump was most probably a result of the movement of TSV. Further flow field analyses indicated that the interaction of the low-energy leakage fluid from adjacent passages with the broken-down tip leakage vortex (TLV) was the flow mechanism for the formation of TSV. Once TSV appeared in tip flow fields, its rearward movement would lead to a periodic variation in near-tip blade loading, which in turn altered the strength of TLV and TSV, accordingly, the low-energy regions associated with the breakdown of TLV and the motion of TSV, thus establishing a self-sustained unsteady flow oscillation in tip flow fields.
机译：为了研究轴流压气机转子的预失速行为，该行为是在尖峰型失速开始时通过实验观察到的，进行了系统的实验和全程模拟，以分析测试转子的内部流场。在这一部分中，重点放在对实验结果的分析以及来自稳态模拟和非稳态模拟的预测结果上，它们收敛到效率几乎周期性波动的平衡解。目的是揭示在接近失速条件下叶尖间隙流动的不稳定行为及其相关的流动机理。为了验证稳态模拟结果，首先将预测的空气动力学参数的总体特征和翼展方向分布与测得的稳态数据进行比较，并取得了良好的一致性。然后，详细分析了在效率波动的一个时期内在数值上获得的非恒定流场。套管附近的瞬时流动结构表明，在先前的非稳态单通道模拟中出现的尖端二次涡流（TSV）确实存在于全通道模拟的尖端流场中。该涡旋的周期性运动是效率近乎周期性变化的主要来源。当质量流量降低时，TSV的模拟有效期增加。在非常接近测得的失速点的流动条件下，TSV的模拟频率等于从瞬时套管压力测量中识别出的特征峰的频率。这个巧合暗示了这种驼峰的发生很可能是TSV运动的结果。进一步的流场分析表明，来自相邻通道的低能泄漏流体与破裂的尖端泄漏涡（TLV）的相互作用是形成TSV的流动机制。一旦TSV出现在尖端流场中，它的向后运动将导致近尖端叶片载荷的周期性变化，进而改变TLV和TSV的强度，因此，与TLV击穿和TSV的运动，从而在尖端流场中建立了一个自持的非恒定流振荡。

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  • 来源
    《Journal of turbomachinery》 |2012年第5期|p.051027.1-051027.12|共12页
  • 作者

    Yanhui Wu; Qingpeng Li; Jiangtao Tian; Wuli Chu;

  • 作者单位

    School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China;

    School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China;

    School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China;

    School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China;

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