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2023 , Vol. 32 >Issue 2: 739 - 752

DOI: https://doi.org/10.1007/s11630-023-1743-9

Design Optimization and Analysis of Exit Rotor with Diffuser Passage based on Neural Network Surrogate Model and Entropy Generation Method

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  • 1. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China
    3. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
    5. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China

网络出版日期: 2023-11-28

基金资助

The authors gratefully acknowledge the support of the National Science and Technology Major Project (2017-II-0006-0020).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Design Optimization and Analysis of Exit Rotor with Diffuser Passage based on Neural Network Surrogate Model and Entropy Generation Method

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  • 1. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China
    3. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
    5. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Online published: 2023-11-28

Supported by

The authors gratefully acknowledge the support of the National Science and Technology Major Project (2017-II-0006-0020).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

为提高多级轴流压气机后面级气动性能，本文提出了一种压气机扩张通道优化设计方法。针对某多级轴流压气机出口级转子搭建了基于遗传算法和神经网络代理模型的扩张通道压气机优化设计平台，优化设计参数包括子午通道扩张角、子午通道扩张长度、叶片弯角和叶片数。根据优化得到的数据库，分析了各设计参数对效率和裕度的影响规律。在优化所得解集中选择了两个扩张通道设计方案，探究了扩张通道设计对效率和裕度的影响规律和机制。结果表明，扩张通道设计可使出口级转子在设计流量点的负荷提高12.1%、效率提高1.28%，同时获得12.50%的裕度改善量。基于当地熵产率损失模型可得，尽管扩张通道转子相较于原型转子，其上下端壁损失增加，但叶型损失明显减小。扩张通道转子的效率受到损失和负荷变化的综合影响。在近失速工况，扩张通道转子叶根区域的堵塞减小是其裕度提升的主要原因。

关键词： exit rotor; diffuser passage; neural network surrogate model; entropy generation rate; flow blockage

本文引用格式

JIN Yun, GENG Shaojuan, LIU Shuaipeng, NI Ming, ZHANG Hongwu . Design Optimization and Analysis of Exit Rotor with Diffuser Passage based on Neural Network Surrogate Model and Entropy Generation Method[J]. 热科学学报, 2023 , 32(2) : 739 -752 . DOI: 10.1007/s11630-023-1743-9

Abstract

In this paper, a diffuser passage compressor design is introduced via optimization to improve the aerodynamic performance of the exit rotor in a multistage axial compressor. An in-house design optimization platform, based on genetic algorithm and back propagation neural network surrogate model, is constructed to perform the optimization. The optimization parameters include diffusion angle of meridian passage, diffusion length of meridian passage, change of blade camber angle and blade number. The impacts of these design parameters on efficiency and stability improvement are analyzed based on the optimization database. Two optimized diffuser passage compressor designs are selected from the optimization solution set by comprehensively considering efficiency and stability of the rotor, and the influencing mechanisms on efficiency and stability are further studied. The simulation results show that the application of diffuser passage compressor design can improve the load coefficient by 12.1% and efficiency by 1.28% at the design mass flow rate condition, and the stall margin can be improved by 12.5%. According to the local entropy generation model analysis, despite the upper and lower endwall loss of the diffuser passage rotor are increased, the profile loss is reduced compared with the original rotor. The efficiency of the diffuser passage rotor can be influenced by both loss and load. At the near stall condition, decreasing flow blockage at blade root region can improve the stall margin of the diffuser passage rotor.

Key words： exit rotor; diffuser passage; neural network surrogate model; entropy generation rate; flow blockage

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