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首页> 外文会议>ASME Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >EXPERIMENTAL STUDY OF BOUNDARY LAYER CONTROL THROUGH TIP INJECTION ON STRAIGHT AND SWEPT COMPRESSOR BLADES
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EXPERIMENTAL STUDY OF BOUNDARY LAYER CONTROL THROUGH TIP INJECTION ON STRAIGHT AND SWEPT COMPRESSOR BLADES

机译：直，压压缩机叶片通过喷头边界层控制的实验研究

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摘要

Recent research on the use of three dimensional blade designs incorporating sweep and casing boundary layer control through tip injection have shown improved efficiency, stage loading and stable operating range Both methods are known to stabilize the flow at the tip trailing edge (Stall Inception Point) of the compressor blade under lower than design mass flow conditions and improve the compressor performance. This study, performed on a low speed axial flow fan, is aimed to improve the understanding and to assess the improved stall margin due to tip injection on swept and straight blades. Injection through flush mounted nozzles on the casing before the rotor blades is of practical importance because of the non-interference of the nozzles with the main flow. Benefits in terms of efficiency and operating range have already been established and swept blades were found to perform better than the baseline straight blades. The injection mechanism involves 12 symmetrically located flush mounted nozzles before the rotor blades in the casing. The number of injection nozzles used is an additional parameter of the study. Although there are manufacturing limitations in the air injection angle, two injection angles (10° and 30°) have been tried. The improvement in stall margin is more pronounced in the straight blades than in the swept blades and the 10° injection angle with 6 active injection holes gives the best performance in comparison to other combinations.
机译：最近对使用三维叶片设计的研究表明，通过尖端注入结合扫掠和套管边界层控制，可以提高效率，级载和稳定的工作范围。两种方法都可以稳定叶片后缘（失速起始点）处的流动。压缩机叶片在低于设计质量流量的条件下工作，并改善了压缩机性能。这项研究是在低速轴流风扇上进行的，旨在增进了解并评估由于扫掠和直叶片上的叶尖注入而导致的失速裕度提高。由于转子喷嘴不会干扰主流，因此在转子叶片之前通过外壳上齐平安装的喷嘴进行注入非常重要。在效率和工作范围方面的好处已经确立，并且发现扫掠刀片的性能优于基线直刀片。注射机构在外壳中的转子叶片之前包含12个对称放置的齐平安装喷嘴。使用的喷嘴数量是研究的另一个参数。尽管空气喷射角存在制造限制，但已经尝试了两个喷射角（10°和30°）。与扫掠叶片相比，直叶片的失速裕度改善更为明显，与其他组合相比，具有6个有效喷射孔的10°喷射角可提供最佳性能。

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