Mechanism of Shock and Load Fluctuation of Variable Nozzle Turbines with Split Sliding Guide Vanes

被引：0
|
作者：
Yang D. [1 ]
Pan Y. [1 ]
Wang G. [2 ]
Lao D. [3 ]
Hu L. [4 ]
机构：
[1] School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, Hebei
[2] State Power Investment Group Zhoukou Gas Thermal Power Co., Ltd., Zhoukou, 466200, Henan
[3] School of Aerospace Engineering, Beijing Institute of Technology, Beijing
[4] Ford Motor Company, Dearborn, 48124, MI
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2020年 / 31卷 / 15期
关键词：
Clearance leakage flow; Load fluctuation; Shock; Split sliding guide vane; Variable nozzle turbine;
D O I：
10.3969/j.issn.1004-132X.2020.15.003
中图分类号：
学科分类号：
摘要：
In view of the low efficiency and strong shock characteristics of the variable nozzle turbines in a diesel engine at low speed, a split sliding guide vane was proposed and designed, and the steady/unsteady numerical calculations were carried out under three typical nozzle openings of 10%, 40% and 100%. Results show that the split sliding guide vanes may effectively restrain the clearance leakage flows and greatly improve turbine efficiency under the small nozzle openings. Under the conditions of 10% opening, the turbine peak efficiency is improved by 10%, besides, turbine efficiency is also improved to different degrees under other openings. At the same time, the trailing edge shocks of the split sliding guide vanes are greatly weakened by the reasonable design of rotor-stator spacing. The weakening of guide blade clearance leakage flows and trailing edge shocks reduces the rotor-stator interference, thus weakens the intensity of load fluctuation on downstream rotor blades and increases the reliability of rotor blades. © 2020, China Mechanical Engineering Magazine Office. All right reserved.
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页码：1778 / 1786
页数：8
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