摘要
涡轮增压器的涡轮叶片在转动过程中受到周期性的气动激励作用,过高的气动激励可能导致涡轮叶片发生高周疲劳(HCF).在无叶蜗壳中,气动激励主要来自蜗舌位置处的压力波动.为了降低涡轮叶片的激振力,笔者从激励产生的来源出发,提出了一种通过喉口射流孔把蜗壳进口段高压气体引流到蜗舌上游低静压区域的压力波动抑制措施,并利用非定常流场数值模拟方法,研究了通过射流孔引入蜗壳进口段高压气体到低静压区对涡轮叶片激振力的改善效果,以及射流孔对涡轮机整机性能的影响.结果表明,该措施可以明显弱化径流涡轮叶片激振力,叶片高振幅区的测点激励幅值最高降低34%,射流孔在弱化激振力的同时,对涡轮机效率的影响可忽略.
The turbine blades of turbocharger are subject to periodic aerodynamic excitation during rotation,and excessive aerodynamic excitation may lead to high cycle fatigue(HCF)of turbine blades.In bladeless volute,the aerodynamic excitation mainly comes from pressure fluctuations at the volute tongue position.To reduce the excitation force of turbine blades,a pressure fluctuation suppression measure by diverting the high-pressure gas from the inlet section of the volute housing to the low static pressure region upstream of the volute tongue was proposed based on the source of excitation generation.The improvement of turbine blade excitation force and its effect on the turbine performance of high-pressure gas introduced through the volute throat jet flow were investigated using an unsteady flow field numerical simulation method.The results show that the measure can significantly weaken the radial turbine blade excitation force.The excitation amplitude of the measuring point in the high amplitude region of the blade is reduced by up to 34%,and the effect of the jet hole on the turbine efficiency can be negligible while weakening the excitation force.
作者
李延昭
于效顺
马敏
司英杰
Li Yanzhao;Yu Xiaoshun;Ma Min;Si Yingjie(School of Intelligent Manufacturing,Weifang University of Science and Technology,Shouguang 262700,China;Key Laboratory of Internal Combustion Engine Turbocharging System,China Machinery Industry Federation,Shouguang 262718,China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2024年第4期367-375,共9页
Transactions of Csice
基金
寿光市科学技术发展计划资助项目(2021JH11)。
关键词
涡轮增压器
激振力
蜗壳喉口射流
压力波动
非定常流动
turbocharger
excitation force
volute throat jet flow
pressure fluctuation
unsteady flow
