离心压气机非轴对称流动特性分析

发布时间：2018-02-28 08:47

本文关键词： 离心压气机非轴对称流动流量载荷　出处：《推进技术》2017年01期 　论文类型：期刊论文

【摘要】：为探求离心压气机蜗壳周向不对称结构引起的内部非轴对称流动现象,采用实验和数值模拟(湍流模型为S-A模型)相结合的方法进行研究。结果表明:非设计工况下蜗壳高静压区域产生的扰动压力波向上游逆向传播,使压气机内部出现非轴对称流动。大流量工况(0.40kg/s)下蜗壳静压的不均匀程度比小流量工况(0.26kg/s)更明显,叶轮出口较强的扰动压力波可以逆向传播到叶轮进口大约180°的周向位置。流经扩压器的气流径向和切向速度的周向不均匀程度在小流量工况下较为显著,但大流量工况下蜗壳进口气流随时间的波动程度更明显。叶轮内部的非轴对称流动特性对叶片载荷分布及其波动形式产生影响,大流量工况下主叶片表面载荷波动主要受基频影响,而小流量工况下主要受2倍频的影响。
[Abstract]:In order to investigate the phenomenon of non-axisymmetric flow caused by the circumferential asymmetric structure of the volute of centrifugal compressor, The experimental and numerical simulation (S-A model) is used to study the problem. The results show that the disturbed pressure waves produced in the high static pressure region of the volute are propagated inversely upstream under off-design conditions. The non-axisymmetric flow occurred inside the compressor. The non-uniformity of volute static pressure was more obvious under large flow condition (0.40 kg / s) than in small flow condition (0.26 kg / s). The strongly disturbed pressure wave at the outlet of the impeller can be propagated to the circumferential position of about 180 掳at the inlet of the impeller. However, under the condition of large flow rate, the fluctuation degree of inlet airflow of volute with time is more obvious. The non-axisymmetric flow characteristics in the impeller have an effect on the load distribution and the fluctuating form of the blade. The surface load fluctuation of the main blade is mainly affected by the fundamental frequency under the condition of large flow rate and by the frequency doubling under the condition of the small flow rate.
【作者单位】：河北工程大学装备制造学院;北京理工大学机械与车辆学院;康跃科技股份有限公司;
【基金】：国家自然科学基金资助项目(51276017) 博士点基金项目(20111101130002) 河北省高校科研项目(ZD2016095)
【分类号】：TH452

【相似文献】