论文部分内容阅读
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。本文以WZJ-70增压器
I. Introduction Low-power radial hearth turbine is widely used, of which the supercharger is a very broad field of application but technical problems are also more prominent an important area. Due to the pulsed air intake and the commonly used non-leaf nozzle structure, the impeller inlet parameters are distorted in time and space. When the car engine working in variable conditions, especially in low-speed conditions, the internal flow of the impeller tends to deteriorate, resulting in a significant reduction in the efficiency of the turbine. The improvement of low-speed performance is the key to vehicle engine supercharging. The traditional design of the impeller did not fully consider the above factors, so it needs to be improved conscientiously. This article to WZJ-70 supercharger