Investigation on Mechanical Characteristics of Air Jet Acting on Nozzle Vanes of VNT  

作　　者：马朝臣 吕伟 张志强 施新 

机构地区：[1]School of Mechanical Engineering,Beijing Institute of Technology

出　　处：《Journal of Beijing Institute of Technology》2010年第2期136-142,共7页北京理工大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China (50676011)

摘　　要：Extensive experimental studies are performed using force sensors to measure actuating forces of nozzle ring devices of variable nozzle turbines. Torques from pneumatic action applied onto axles of nozzle vanes have been calculated. Test results obtained through repeated experiments are quite congruent, confirming the effectiveness of this simple method. Results have indicated that, with a fixed opening angle of guide vane, pneumatic torque increases with mass flow of air jet in the turbine; moreover, under the same mass flow rate, torque decreases with reducing opening angle, even possibly change direction down to negative. The results have also provided a modus operandi for designing nozzle-adjusting devices as well as validation data for numerical study on changes of pneumatic torque onto guide vanes under full engine operating conditions.Extensive experimental studies are performed using force sensors to measure actuating forces of nozzle ring devices of variable nozzle turbines. Torques from pneumatic action applied onto axles of nozzle vanes have been calculated. Test results obtained through repeated experiments are quite congruent, confirming the effectiveness of this simple method. Results have indicated that, with a fixed opening angle of guide vane, pneumatic torque increases with mass flow of air jet in the turbine; moreover, under the same mass flow rate, torque decreases with reducing opening angle, even possibly change direction down to negative. The results have also provided a modus operandi for designing nozzle-adjusting devices as well as validation data for numerical study on changes of pneumatic torque onto guide vanes under full engine operating conditions.

关 键 词：variable nozzle turbine nozzle vane pneumatic torque 

分 类 号：TK14[动力工程及工程热物理—热能工程]