蜗壳周向流动非均匀性对可调向心涡轮性能的影响  

Influence of Volute Inflow Inhomogeneity on the Characteristic of Variable Radial Inflow Turbine

作　　者：邢世凯[1,2] 马朝臣[1] 胡辽平[3] 潘航宇[3] 高建兵[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]河北师范大学职业技术学院,河北石家庄050024 [3]湖南天雁机械有限责任公司,湖南衡阳421005

出　　处：《内燃机学报》2015年第3期265-271,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(51276018);河北省教育厅自然科学研究基金资助项目(QN20131017;QN2014164)

摘　　要：基于蜗壳周向流动不均匀的特性,建立增压器涡轮级全周计算模型,并与试验数据进行对比,验证数值计算结果的有效性.在此基础上,根据试验数据确定边界条件进行三维黏性数值计算,重点探讨蜗壳周向流动非均匀性对可调向心涡轮内部流场的影响.计算结果表明:该增压器蜗壳周向流动的非均匀性导致导叶和叶轮内部的流场分布出现周向不均匀的特性,即导叶入口气流角周向分布变化较大,叶轮各叶片负荷和各通道流量均呈现周向分布不均匀的特点.个别叶片负荷突变,有可能诱发叶片振动,降低涡轮使用寿命.Based on the characteristics of nonuniform volute circumferential flow,a full week turbocharger turbine stage calculation model was established. The model was compared with the experimental results to verify its validity of the simulation. Experimental data were used to determine the boundary conditions of three-dimensional viscous numerical calculations,focusing on the influence of volute inflow inhomogeneous on the internal flow field of variable radial inflow turbine. Calculation results show that the volute inflow inhomogeneity leads to the uneven features distribution of guide vanes and impeller internal circumferential flow. Inlet flow angle of the guide vanes shows a great change in circumferential distribution,and each blade of impeller load and flow circumferential distribute is not uniform. Individual blade loading mutation may cause the blade vibration,reducing the service life of the turbine.

关 键 词：导流叶片可调涡轮 蜗壳流动非均匀性 径向涡轮 内部流场 数值模拟 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]