混合型前缘掠对离心压气机气动性能的影响

发布时间：2018-02-10 06:56

本文关键词： 跨音速离心压气机前缘混合掠激波低能流团二次流　出处：《内燃机学报》2016年03期 　论文类型：期刊论文

【摘要】：对带有叶片前缘混合掠的跨音速离心压气机流场进行了数值模拟研究.结果表明:叶片前缘混合前掠能够有效提高压气机流通能力,拓展失速裕度,推迟压气机失稳,使压气机工作裕度得到明显提升,而叶片前缘混合后掠则减少失速裕度,使压气机工作裕度下降,易发生失稳;叶片前缘混合前掠可以有效减弱叶轮通道内部激波强度,而前缘混合后掠会使通道内激波强度增强,造成一定的激波损失;虽然二者均可以改善通道下游分流叶片两侧低能流团的分布情况,但叶片前缘混合前掠改善作用更好;叶片前缘混合掠对压气机内部二次流的影响主要集中在叶片前缘附近,对叶轮出口附近二次流影响不大.通过对不同前缘混合掠结果对比分析,叶片前缘混合前掠在提高压气机流通能力、工作裕度以及改善内部气流流动情况具有明显的优势.
[Abstract]:The numerical simulation of the flow field of a transonic centrifugal compressor with blade leading edge mixing sweep is carried out. The results show that the blade leading edge mixing forward sweep can effectively improve the compressor flow capacity, expand the stall margin, and delay the compressor instability. The compressor working margin is improved obviously, while the stall margin is reduced, the compressor working margin is decreased, and the blade front edge mixing forward sweep can effectively reduce the intensity of shock wave in the impeller passage, so that the compressor working margin is decreased and the compressor work margin is easy to lose stability, and the blade front edge mixing forward sweep can effectively reduce the intensity of shock wave in the impeller passage. Although both of them can improve the distribution of the low energy flow on both sides of the downstream shunt blade, the forward mixing of the front edge of the blade is better. The influence of blade leading edge mixing sweep on the secondary flow in the compressor is mainly near the blade front edge, but it has little effect on the secondary flow near the impeller outlet. Blade leading edge mixing forward sweep has obvious advantages in increasing compressor flow capacity, working margin and improving internal airflow.
【作者单位】：北京理工大学宇航学院;清华大学汽车安全与节能国家重点实验室;
【基金】：清华大学汽车安全与节能重点实验室开放基金资助项目(KF12011)
【分类号】：TK403

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