激励参数对合成射流控制压气机流动分离的影响
发布时间：2018-12-14 15:48
【摘要】：对吸力面施加合成射流激励的高负荷压气机静叶栅展开数值模拟,系统地研究不同激励参数对单缝合成射流改善叶栅气动性能的影响,并探索分段式合成射流控制流动分离的有效性。研究结果表明,单缝合成射流对栅内流动的作用效果主要取决于两个因素:射流切向动量注入带来的气动性能改善与射流输运过程的附加流动损失。单缝合成射流具有较为宽广的有效频率范围,当激励频率等于主流流过叶型的频率且射流满足有效激励动量要求时,对叶栅气动性能的改善效果最佳,总压损失降低约14.26%。分段式合成射流能够较好地适应不同叶高处分离起始点沿轴向变化对最佳流动控制位置的要求,在不增加有效射流面积的前提下可较单缝射流更为有效地控制流动分离,此时的损失降低幅度高达15.84%,从另外一个角度证实了激励位置对于非定常激励的重要性。
[Abstract]:The static cascade of a high load compressor subjected to a combined jet excitation on the suction surface was numerically simulated, and the effects of different excitation parameters on the aerodynamic performance of the cascade by single suture jet were studied systematically. The effectiveness of flow separation controlled by segmented synthetic jet was explored. The results show that the effect of single sutured jet on the flow in the grid is mainly determined by two factors: the improvement of aerodynamic performance caused by jet tangential momentum injection and the additional flow loss in the jet transport process. The single sutured jet has a wide effective frequency range. When the excitation frequency is equal to the frequency of the mainstream flow through the blade shape and the jet meets the requirement of effective excitation momentum, the aerodynamic performance of the cascade can be improved best. The total pressure loss was reduced by 14.26%. The segmented synthetic jet can better meet the requirements of the optimal flow control position for the axial variation of the starting point of separation at different blade heights, and it can control the flow separation more effectively than the single slit jet without increasing the effective jet area. The loss reduction is as high as 15.84, which proves the importance of incentive position for unsteady excitation.
【作者单位】： 哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金(51306042)
【分类号】：TH45
本文编号：2378897
[Abstract]:The static cascade of a high load compressor subjected to a combined jet excitation on the suction surface was numerically simulated, and the effects of different excitation parameters on the aerodynamic performance of the cascade by single suture jet were studied systematically. The effectiveness of flow separation controlled by segmented synthetic jet was explored. The results show that the effect of single sutured jet on the flow in the grid is mainly determined by two factors: the improvement of aerodynamic performance caused by jet tangential momentum injection and the additional flow loss in the jet transport process. The single sutured jet has a wide effective frequency range. When the excitation frequency is equal to the frequency of the mainstream flow through the blade shape and the jet meets the requirement of effective excitation momentum, the aerodynamic performance of the cascade can be improved best. The total pressure loss was reduced by 14.26%. The segmented synthetic jet can better meet the requirements of the optimal flow control position for the axial variation of the starting point of separation at different blade heights, and it can control the flow separation more effectively than the single slit jet without increasing the effective jet area. The loss reduction is as high as 15.84, which proves the importance of incentive position for unsteady excitation.
【作者单位】： 哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金(51306042)
【分类号】：TH45
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，本文编号：2378897
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