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Journal of Thermal Science

热科学学报

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2022 , Vol. 31 >Issue 5: 1734 - 1744

DOI: https://doi.org/10.1007/s11630-022-1671-0

气动

Characterization of Swirling Inflow Effects on Turbine Performance under Pulsating Flows

  • DING Zhanming ,
  • WANG Cuicui ,
  • ZHANG Junyue ,
  • LIU Ying ,
  • HOU Linlin ,
  • ZHUGE Weilin ,
  • ZHANG Yangjun
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  • 1. Science and Technology on Diesel Engine Turbocharging Laboratory, China North Engine Research Institute, Tianjin 300400, China
    2. Kangyue Technology (Shandong) Co., Ltd, Shouguang, Shandong 262718, China
    3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

网络出版日期: 2023-12-01

基金资助

The authors would like to thank the foundation of Science and Technology on Diesel Engine Turbocharging Laboratory (No.6142212190101) and Young Elite Scientists Sponsorship Program by CAST (2021QNRC001) for the supports.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Characterization of Swirling Inflow Effects on Turbine Performance under Pulsating Flows

  • DING Zhanming ,
  • WANG Cuicui ,
  • ZHANG Junyue ,
  • LIU Ying ,
  • HOU Linlin ,
  • ZHUGE Weilin ,
  • ZHANG Yangjun
Expand
  • 1. Science and Technology on Diesel Engine Turbocharging Laboratory, China North Engine Research Institute, Tianjin 300400, China
    2. Kangyue Technology (Shandong) Co., Ltd, Shouguang, Shandong 262718, China
    3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Online published: 2023-12-01

Supported by

The authors would like to thank the foundation of Science and Technology on Diesel Engine Turbocharging Laboratory (No.6142212190101) and Young Elite Scientists Sponsorship Program by CAST (2021QNRC001) for the supports.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

论文研究了在脉冲条件下进口旋流对径流式增压器涡轮流动行为及性能的影响规律。为了分析进口旋流效应，开展了脉冲旋流进气下的非定常仿真、等效脉冲均匀进气下的非定常仿真和等效均匀进气下的准定常仿真等三组仿真研究。结果表明，旋流进气对涡轮瞬时性能有明显负面影响，导致涡轮循环平均效率降低2.5%。进口旋流在蜗壳和叶轮内部均导致显著的流动损失，而脉冲均匀进气仅引起叶轮内损失增大、对蜗壳内损失影响很小。涡轮瞬时效率的降低与进口旋流强度存在明显相关关系。在非定常进口旋流的影响下，蜗壳流场高度畸变，自由涡方程失效。进口旋流与蜗舌尾迹存在显著的相互影响，这引发了额外损失。叶轮进口相对气流角显著减小，同时其分布出现明显畸变。旋流进气在叶轮内引起较强的分离流和通道涡，进而导致叶轮性能恶化。

关键词： swirling inflow; pulsating flow; CFD; turbocharger turbine; internal combustion engine

本文引用格式

DING Zhanming , WANG Cuicui , ZHANG Junyue , LIU Ying , HOU Linlin , ZHUGE Weilin , ZHANG Yangjun . Characterization of Swirling Inflow Effects on Turbine Performance under Pulsating Flows[J]. 热科学学报, 2022 , 31(5) : 1734 -1744 . DOI: 10.1007/s11630-022-1671-0

Abstract

The present study focuses on the influence of the swirling flows on flow behaviors and performance of a radial-flow turbocharger turbine under pulsating inflow condition. To characterize the effects of swirling flow, three sets of simulations of the turbine were carried out, which are an unsteady simulation under pulsating swirling inflow, an unsteady simulation under equivalent pulsating uniform inflow, and quasi-steady simulations under uniform inflow. Results proved that swirling flow has a considerable negative influence on turbine instantaneous performance and lead to 2.5% cycle-averaged efficiency reduction under pulsating flow condition. Swirling inflow would lead to significant losses in both the volute and the rotor, while the pulsating inflow leads to higher losses in the rotor and shows little influence on the losses in the volute. The instantaneous efficiency reduction of the turbine could be correlated with the time-varying inlet swirl strength. Under the influence of unsteady inlet swirls, the volute flow field is highly distorted and the free vortex relation is no longer valid. The swirling flow has strong interactions with the wake flow of the volute tongue, leading to additional losses. Relative flow angle at rotor inlet is remarkably reduced and its distribution is significantly distorted. Strong separation flows and passage vortices would appear in the rotor because of the swirling inflow, leading to inferior rotor performance.

Key words： swirling inflow; pulsating flow; CFD; turbocharger turbine; internal combustion engine

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