异相脉冲进气混流涡轮非定常特性数值模拟

发布时间：2018-01-10 17:25

本文关键词：异相脉冲进气混流涡轮非定常特性数值模拟　出处：《工程热物理学报》2016年01期 　论文类型：期刊论文

【摘要】：车用增压器双通道涡轮进口气流是脉动不同步变化的,基于稳态方法设计的涡轮在实际运行条件下的性能与其稳态性能存在差异。为了解异相脉冲进气条件下涡轮性能,改善涡轮与发动机的匹配,本文使用数值模拟的方法对最大扭矩工况对应的40 Hz脉冲频率进气条件下涡轮内部流场进行了研究。结果表明:涡轮入口两个通道内压力越不均衡,涡轮的效率和流通能力越低,叶轮入口攻角变化对叶轮流场影响很大,进口攻角随叶高变化,且与涡轮级入口压力水平有关,脉冲波还会影响吸力面的气体分离涡团。
[Abstract]:The inlet flow of the two-channel turbine of the vehicle turbocharger is pulsating and out of sync. The performance of turbine designed based on steady state method is different from that of its steady state performance. In order to understand the turbine performance under the condition of heterogeneous pulse inlet, the matching between turbine and engine is improved. In this paper, numerical simulation method is used to study the internal flow field of the turbine under the condition of 40 Hz pulse frequency inlet corresponding to the maximum torque condition. The results show that the pressure in the inlet two channels of the turbine is more unbalanced. The lower the efficiency and the flow capacity of the turbine, the greater the impeller inlet angle of attack affects the blade rotation field. The inlet angle of attack varies with the blade height and is related to the inlet pressure level of the turbine stage. Pulse waves also affect the gas separation vortex on the suction surface.
【作者单位】：北京理工大学机械与车辆学院;北京汽车动力总成有限公司;
【基金】：国家自然科学基金项目(No.51276018)
【分类号】：U464.135
【正文快照】： 0引苜通常在进行车用增压器涡轮设计时采用定常流动条件,实际上车用发动机广泛采用脉冲增压方式W,活塞式发动机排气过程造成涡轮入口流动是脉冲进气条件,定常假设并不符合涡轮的实际运行条件. 另外,对于采用脉冲增压系统的气缸数大于等于4的发动机,涡轮箱设计为双通道型式,以

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