Flow control of compressor rotor cascade by blade-attached vortex generator
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摘要:
提出基于叶片依附式楔形涡流发生器（VG）的压气机叶栅内部流动控制方法，并开展三维稳态雷诺平均Navier-Stokes（RANS）方法对其进行数值仿真研究。对4种不同形状方案的VG叶栅性能开展计算并分析内部流动，研究结果表明：倒置对称方案的VG可以有效改善叶栅性能。不同形状的VG均可以抑制激波/附面层干扰分离，但控制效果相差明显。在弯曲的压气机叶栅通道中，倒置方案的VG涡紧贴吸力面，控制效果强于VG涡远离吸力面的正置方案。对称方案产生的VG涡对强度低可以沿轴向抑制激波/附面层干扰分离，非对称方案产生的VG涡强度高可以沿轴向和展向抑制分离，但会伴随更大的静压损失。因此综合VG的分离抑制效果和其本身引入的负面影响，倒置对称方案更适用于控制压气机叶栅内部的流动分离。
Abstract:A flow control method in compressor cascade based on blade-attached wedge vortex generator (VG) was proposed, and the numerical simulation of 3D steady Reynolds-averaged Navier-Stokes （RANS） method was carried out. The numerical method was verified, and compared with the experiment results to indicate its correctness. Furthermore, the performance of cascades with four different shape VGs was calculated and the internal flow was analysed. The results showed that the VG with inverted-symmetric shape can effectively improve the cascade performance, and widen the cascade working range. The four-shape schemes can suppress shock wave/boundary layer interaction separation, but the control effects were significantly different. In curved compressor cascade passage, the VG vortex of inverted schemes was close to suction surface, and the control effect was better than that of the forward schemes away from suction surface. The weaker VG vortex pair generated by symmetric scheme can suppress shock wave/boundary layer interaction separation along the axial direction, and the stronger VG vortex from unsymmetric scheme can suppress the separation along the axial and span directions, but with greater static pressure loss. Therefore, considering the separation suppression by VG and its own negative effects, the inverted-symmetric scheme is more suitable for the flow control inside the compressor cascade.
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表 1 原始叶栅参数
Table 1. Parameters of original cascade
参数 数值 轴向弦长 Cax/mm 35.9 栅距 t/mm 37.6 安装角 βs/（°） 39.9 
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