Integrated and Joint Design Optimization of Centrifugal Compressor Impeller and Casing Treatment at Multiple Working Points

LU Yifan; ZHANG Xiawen; LI Zhen; JU Yaping; ZHANG Chuhua

doi:10.7652/xjtuxb202607014

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Integrated and Joint Design Optimization of Centrifugal Compressor Impeller and Casing Treatment at Multiple Working Points

更新时间：2026-07-09

- Integrated and Joint Design Optimization of Centrifugal Compressor Impeller and Casing Treatment at Multiple Working Points
- Journal of Xi'an Jiaotong University Vol. 60, Issue 7, Pages: 148-158(2026)
- 作者机构：
  
  西安交通大学能源与动力工程学院，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202607014
  CLC： TH452
- Received：19 September 2025，
  
  Published：10 July 2026
- 稿件说明：
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LU Yifan, ZHANG Xiawen, LI Zhen, et al. Integrated and Joint Design Optimization of Centrifugal Compressor Impeller and Casing Treatment at Multiple Working Points[J]. Journal of Xi'an Jiaotong University, 2026, 60(7): 148-158.
DOI：

LU Yifan, ZHANG Xiawen, LI Zhen, et al. Integrated and Joint Design Optimization of Centrifugal Compressor Impeller and Casing Treatment at Multiple Working Points[J]. Journal of Xi'an Jiaotong University, 2026, 60(7): 148-158. DOI： 10.7652/xjtuxb202607014.

摘要

为缓解现代涡轮增压器离心压气机引入机匣处理对压气机性能产生的负面影响，提出了一种离心叶轮与机匣处理于一体、多工况点联合的优化设计方法。首先，通过分析影响压气机性能的主要几何参数，建立机匣处理、机匣子午型线和叶轮叶片角分布的几何参数一体化方法。然后，基于数据驱动的自动优化方法对压气机叶轮与机匣处理几何参数进行了一体联合优化。在此基础上，分析了机匣处理与叶轮的耦合作用机制，总结了高效设计方案下的流场特征。结果表明：相比基准叶轮-机匣处理模型，一体联合优化后的压气机在稳定运行范围不下降的前提下，3个目标工况点的总压比分别提升了4.55%、4.97%、3.70%，绝热效率分别提升5.04%、5.46%、5.52%，压气机高效区扩大并向目标工况点偏移，优化后的压气机使得内燃机热效率提升1.68%；仅将机匣处理作为扩稳手段而不对叶轮-机匣处理一体优化会导致额外的性能损失；采用后加载的叶顶载荷分布以降低叶片前缘吸、压力面逆压梯度是性能提升的主要流动机理。

Abstract

To mitigate the negative effects of casing treatment on the performance of modern turbocharger centrifugal compressors，a j oint optimization method that integrates the centrifugal impeller with casing treatment across multiple working points is developed.First，by analyzing the principal geometric parameters affecting compressor performance，an integrated parameterization of the casing treatment，casing meridional profile，and impeller blade angle distribution was established. Then，integrated and joint optimization of geometric parameters of the compressor impeller and casing treatment was performed using a data-driven automated optimization method.Based on the optimized designs，the coupling mechanism between casing treatment and the impeller was analyzed，and the flow field characteristics of high-efficiency designs were summarized.Results show that，compared with the baseline impeller-casing treatment model，the optimized compressor exhibits increases in total pressure ratio of 4.55%，4.97%，and 3.70%，and increases in adiabatic efficiency of 5.04%，5.46%，and 5.52% at three target working points，respectively，without a reduction in the stable operating range.The compressor's high-efficiency region was expanded and shifted toward the target working points.The optimized compressor yielded a 1.68% improvement in the thermal efficiency of the internal combustion engine.Applying casing treatment solely as a flow-stabilization measure without joint optimization with the impeller was found to cause additional performance losses.The primary flow mechanism responsible for performance improvement was identified as a rear-loaded blade-tip loading distribution，which reduces leading-edge suction and mitigates the adverse pressure gradient on the pressure side.

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references

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