孔式非定常脉动抽吸控制高负荷压气机叶栅内流动分离的参数研究

Parametric Investigations of Unsteady Holed Pulsed Suction to Control Flow Separationsin a Highly Loaded Compressor Cascade

关键词:  非定常脉冲抽吸  高负荷压气机  激励参数  时均抽吸率  流动分离

Key words:  Unsteady pulsed suction  Highly loaded compressor  Excitation parameter  Time-averaged suction flow rate  Flow separation

摘要:

为了探索非定常脉冲抽吸在高负荷压气机叶栅中控制流动分离的应用前景，掌握非定常脉动抽吸在不同激励参数条件下的适应性和可行性，首先对非定常脉动抽吸的不同激励参数包括激励频率、位置、前向倾角和侧向倾角进行了详细的讨论和分析。然后，基于最优激励参数，将非定常脉动抽吸与传统的定常抽吸进行了比较分析。结果表明:在流动分离的控制中，激励参数起着重要的作用，当激励参数在相应的最优范围内气动性能才能被明显地提升，如果远离相应的最优范围，控制分离的效果将会减弱，甚至导致总压损失增加。当所有激励参数都是其最优值时，在时均抽吸率只有0.4%的情况下，总压损失减小了19%。基于最优激励参数，在相同时均抽吸量的情况下，相比于定常抽吸，非定常脉动抽吸在控制流动分离、改善气动性能上具有更大的优势。

Abstract:

In order to explore the application prospects of unsteady pulsed suction (UPS) to control flow separations in a highly loaded compressor cascade and to understand the adaptability and flexibility of UPS under different excitation parameters， different excitation parameters of UPS such as excitation frequency， excitation location， pitch angle， and skew angle were first discussed and analyzed in detail. And then， based on the optimum excitation parameters， the result of UPS was compared with that of steady contant suction (SCS). The results show that excitation parameters play important roles in controlling flow separations. The aerodynamic performances of compressors can be significantly enhanced when all the excitation parameters are in their optimum ranges; if not， the control effect of flow separation will be weakened， which even results in an increase of the total pressure loss. When all the excitation parameters are their optimum values， total pressure loss is reduced by 19% only with the time-averaged suction flow rate [ms]=0.4%. Based on the optimum excitation parameters， UPS has more advantage in controlling flow separations and improving aerodynamic performances compared to SCS with the same time-averaged suction flow rate.