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Stability enhancement using a new hybrid casing treatment in an axial flow compressor

机译：在轴流压缩机中使用新型混合套管处理提高稳定性

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A hybrid slot-groove casing treatment (CT) composed of front axial slots and rear circumferential grooves is experimentally studied in a low-speed axial compressor in consideration of stability and efficiency. Results show that the hybrid slot-groove CT can improve the stall margin by 19.79% with an efficiency penalty of 1.5%. Compared to full-groove and full-slot CTs, the hybrid slot-groove CT's stall margin improvement and minimization of efficiency loss are excellent. Detailed measurements indicate that, unlike smooth casing (SC), the hybrid slot-groove CT can unload the blade tip, weaken the tip leakage vortex, and improve the disturbance observed downstream to postpone stall. Given the influence of serious passage blockage derived from the hub region after improving tip flow capability under the hybrid slot-groove CT, the stall route and inception captured in the casing wall and different downstream radial positions demonstrate that, unlike the SC with a typical spike-type inception (short length-scale with 2-3 blade passages), the hybrid slot-groove CT creates a long length-scale stall inception (6-8 blade passages). In addition, a new type of instability inception with a different frequency band from the stall cell is found in the hub region under the hybrid slot-groove CT. This inception appears more than hundreds of revolutions before the fast trigger of spike-type inception and can be used as an early stall warning signal under high hub loading. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：考虑到稳定性和效率，在低速轴向压缩机中对由前轴向槽和后圆周槽组成的混合槽槽式套管处理（CT）进行了实验研究。结果表明，混合槽槽式CT可以将失速裕度提高19.79％，效率损失为1.5％。与全槽式和全槽式CT相比，混合槽式CT的失速裕度提高和效率损失最小。详细的测量结果表明，与光滑外壳（SC）不同，混合槽式CT可以使叶片尖端卸荷，减弱尖端泄漏涡流，并改善下游观察到的扰动以推迟失速。考虑到混合槽式槽CT改善了尖端流动能力后，轮毂区域产生了严重的通道阻塞，在套管壁和不同的下游径向位置捕获的失速路线和起始点表明，与典型尖峰的SC不同初始槽型（短的长度刻度，带有2-3个刀片通道），混合槽式CT产生了长长度型的失速起始（6-8个刀片通道）。此外，在混合槽-槽CT下的轮毂区域中发现了一种新型的不稳定性起始，其频率不同于失速单元。在快速触发尖峰型启动之前，该启动出现了数百转，并且可以用作在高轮毂负载下的早期失速警告信号。 （C）2018 Elsevier Masson SAS。版权所有。

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