确定应力模型在离心压缩机级流场模拟的应用  

Application of Deterministic Stresses Model in Simulation of Centrifugal Compressor Stage Flow Field

作　　者：高丽敏[1] 李晓军[1] 高杰[1] 刘波[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710049

出　　处：《机械工程学报》2011年第2期166-172,共7页Journal of Mechanical Engineering

基　　金：西北工业大学'翱翔之星'计划;基础研究基金;国防重点实验室基金;国家自然科学基金(51076132);航空科学基金(2010ZB53014)资助项目

摘　　要：在求解多级叶轮机械流场的定常计算方法中,ADAMCZYK提出的通道平均方法比混合界面方法更为严格也更为复杂,方程中的确定应力项反映了级环境下流场非定常性的时均效应。然而,与雷诺平均方程一样,通道平均方程本身也没包含足够的信息来确定它的解。基于简化的通道平均方程,建立适合离心压缩机动静相干非定常的半经验确定应力模型,替代重叠区域方法来计算确定应力的方法,结合界面处理方法,发展预测离心压缩机级环境下包含动/静相干周期性非定常流场的时均效应的定常计算方法。采用确定应力模型及混合界面两种方法对两台离心压缩机级内的流场进行计算,两种方法计算时间相当。与混合界面方法相比,由于考虑了非定常流动的时均效应,确定应力模型方法得到的流场分布与试验测量更加吻合;而且确定应力的引入在一定程度上能补偿'人工掺混'带来的影响,采用确定应力模型能够得到更真实的流场。The passage-averaged N-S equations proposed by ADAMCZYK is proved to be a more rigorous and complicated model than the mixing plane model in the flow prediction of multistage turbomachinery using steady state methods,in which the deterministic stresses represent the time-averaged effect of the flow unsteadiness.Like the RANS,the average-passage N-S equations do not contain sufficient information to determine its solution.Based on reduced passage averaged N-S equations,a semi-empirical deterministic stresses model is introduced instead of overlapping domain approach.By combining the interface approach with the deterministic stresses model,a steady simulation method is developed to predict the effect of the time-averaged unsteadiness in the centrifugal compressor stage.To verify the developed deterministic stresses model and the corresponding numerical method,two computations for two centrifugal compressors are performed： one is the solution of reduced passage-averaged N-S with the developed deterministic stresses model;the other is of the steady N-S equations with the mixing plane.Two computations cost the similar time.Compared with the mixing plane method,results with deterministic stresses model has a better agreement with the experiment due to considering the time averaged effects of the flow unsteadiness;deterministic stresses compensate the influence of the ＂artificial mixing＂ with the interface plane,and the deterministic stress model provides more realistic flow field prediction than the mixing plane model.

关 键 词：通道平均 N-S 方程 多级环境 确定应力 离心压缩机 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]