可变截面涡轮增压器喷嘴叶片小开度流动特性  

Analysis of Steady-State Flow Plant under Small Opening of Variable Section Turbocharger

作　　者：姜鹏飞 李延昭 闫伟[1] 王桂华[1] 杨文芳 JIANG Pengfei,LI Yanzhao , YAN Wei , WANG Guihua , Yang Wenfang(1. School of Energy and Power Engineering ,Shandong University, dinan 250061, China 2. Kangyue Technology Co., Ltd., Weifang 262718, China ;3. Key Laboratory of Internal Combustion Engine Pressurization System in Machinery Industry, Weifang 262718, China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]康跃科技股份有限公司,山东潍坊262718 [3]机械工业内燃机增压系统重点实验室,山东潍坊262718

出　　处：《内燃机与动力装置》2018年第3期1-5,共5页Internal Combustion Engine & Powerplant

摘　　要：利用NUMECA三维仿真软件对某款可变截面增压器(variable geometry turbocharger,VGT)分别在50%开度和10%开度和140 000 r/min工况下,各选取5各工况点进行仿真计算,通过对导叶周围速度场、压力场等宏观现象的分析,探究其在小开度下涡端效率低的原因。结果表明:小开度下流体经过导叶时的加速程度较大,整体速度偏高;导叶沿叶高方向上,压力损失系数较大;这些变化主要是由于导叶出口气流角和叶端间隙泄漏流的综合影响造成的,并且在小开度下叶端间隙泄漏流对主流道的干涉程度较大,对流动损失的影响权重较大。By using NUMECA thine-dimensional simulation software in a certain type of variable geometry turbocharger （VGT） at in 50% and 10% opening cases respectively, and the working condition of 140 000 r/min, five operating point were selected to simulating calculated. Through the analysis of the guide vane such as the velocity field and pressure field, the reasons for the low efficiency under the small opening degree were explored. The results show that the acceleration of the fluid under the small opening is larger and the overall velocity is higher. The pressure loss coefficient is gloater along the diffretion of the blade. It＇s mainly due to the comprehensive influence of the outlet flow angle and the tip clearance leakage flow. And under the small opening degree the leakage flow of the tip clearance has great influence on the mainstream channel, and flow loss.

关 键 词：增压器 可变截面 小开度 流动损失 

分 类 号：U464.135.2[机械工程—车辆工程]