增压器无叶喷嘴宽度对其出口流场影响的研究  

Influence of Nozzle Width in Turbocharger Scroll on its Outlet Flow Field

作　　者：王仁人[1] 房克信[2] 李国祥[2] 

机构地区：[1]山东轻工业学院,山东济南250100 [2]山东大学,山东济南250061

出　　处：《车用发动机》2001年第2期12-15,共4页Vehicle Engine

基　　金：山东省优秀中青年科学家科研奖励基金资助项目! (972 5 3 118) ;山东省自然科学基金赞助项目 !(Q98F0 414 5 )

摘　　要：用心形线表征了一种增压器无叶蜗壳梨形流道横截面轮廓 ,用有限差分法对增压器蜗壳内无叶喷嘴出口流场进行了数值模拟计算 ,研究了喷嘴宽度 (B)对其出口流场的影响。结果表明 ,喷嘴出口速度及气流角 (α)分布不均匀 ,随着 B沿蜗壳轴向减小 ,α逐渐减小且其分布趋于较均匀 ,而喷嘴出口速度逐渐增加但其分布趋于恶化 ;B减小到一定程度后 ,喷嘴出口流场变化不大。B沿蜗壳周向线形减小时 ,可改善α分布 。The pear shaped flow section contour of turbocharger scroll is featured by heart shaped line. The flow field of nozzle outlet is simulated by using FDM,and the influence of nozzle width B on its flow field is investigated. The nozzle outlet velocity and flow angle α are uneven,and with the B axial increase the α decreases gradually and its distribution tends even,but the velocity increases constantly and its distribution becomes worse. The flow field of nozzle outlet varies a little as the B decreases to some extent. As the B decreases linearly along the scroll circumference,the distribution of α is improved, but the velocity is improved a little.

关 键 词：涡轮增压器 车用柴油机 无叶蜗壳 喷嘴宽度 气流角 速度 有限差分法 

分 类 号：U464.172[机械工程—车辆工程]