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为了进一步加深对转子叶尖区域非定常流动现象的认识,针对某一跨声速单转子轴流压气机,采用三维非定常数值方法开展了详细研究。对单转子在不同进气条件以及不同工作流量下分别进行非定常模拟,来研究该转子叶尖区域复杂流动结构以及叶尖非定常流动的发展过程。结果表明:不同进气条件下,转子叶尖区域流场结构形式表现不同.当进口非轴向进气时,叶尖非定常流动呈单通道周期形式;而轴向进气时,叶尖区域出现了类似于“旋转不稳定”的沿周向传播的非定常流动现象,且随着工作流量的减小,叶尖区域流场结构也相应发生改变.
In order to further deepen the understanding of the unsteady flow in the rotor tip region, a three-dimensional unsteady numerical method is studied in detail for a transonic single-rotor axial-flow compressor. The unsteady simulation of a single rotor under different inlet conditions and different working flows is carried out to study the complicated flow structure in the rotor tip region and the development of unsteady tip flow. The results show that under different air inlet conditions, the flow field in the rotor tip region behaves differently. When the inlet is non-axial, the tip unsteady flow presents single-channel periodic form. A phenomenon of unsteady flow propagating in the circumferential direction similar to “rotating instability ” appeared, and as the working flow decreased, the flow field structure in the tip region changed correspondingly.