摘要
一、引言 小功率向心透平的应用甚广,其中车用增压器是其应用前景极为广泛但技术问题亦较突出的一个重要领域。由于脉冲进气以及普遍采用的无叶喷嘴结构,叶轮进口参数在时空上均有畸变。当车用发动机变工况运行特别是低速工况运行时,叶轮内部流动易于恶化,致使透平效率明显下降。而低速工况性能的改善正是车用发动机增压的关键。传统的叶轮设计没有充分考虑上述因素,因此需要认真改进。
In this paper theoretical and numerical analyses are made of revising the Inlet profile of a radial inflow turbine impeller for WZJ-70 vehicular turbocharger, in view of the impeller inlet conditions which depend on the vaneless nozzle exit flow field, the engine pulsating discharge, and its off-design running. A new-design plan of impeller which is characterized by its inlet profile, forward-curved in the middle part and swept-back near the shroud and hub, has been proposed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1990年第1期47-49,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金
