摘要
受高效飞行鸟类翼型结构启发,尝试采用叶轮仿鸮翼设计结合子午流道型线参数优化设计提高离心压缩机的气动性能。首先,提取具有优良气动性能的长耳鸮翅膀展向40%截面处翼型进行仿生逆向重构,基于鸮翼厚度分布特征进行离心压缩机叶轮的仿生设计;然后,采用拉丁超立方抽样、BP神经网络拟合、遗传算法寻优对叶轮叶顶侧子午流道型线进行参数优化,并对优化设计前后的离心压缩机气动性能及其流动特性进行数值分析。结果表明:采用提出的叶轮仿生设计耦合子午流道参数优化方法,离心压缩机内部流场得到改善,气动性能得到提升。设计工况下,优化后的离心压缩机多变效率提高了3.16%,压比提升了2.61%;叶轮内部及叶片扩压器出口的高熵区域缩小,流动分离得到有效抑制,同时叶片表面载荷增大且分布更加均匀,叶轮做功能力增强。
There are practices that airfoil imitates bird’s wing to improve the efficiency.Inspired by this,the paper attempts to improve the aerodynamic performance of the centrifugal compressor with the bionic impeller imitating owl’s wing combined with the optimized meridian channel profile parameters.Firstly,the aerofoil inspired by the 40%section in the span direction of the long-eared owl wings,which shows excellent aerodynamic performance,is taken for reverse bionic reconstruction.The bionic centrifugal compressor impeller is designed according to the thickness distribution of the long-eared owl’s wing.After that,the parametric optimization of the meridian channel profile on the impeller blade top is conducted through Latin hypercube sampling,BP neural network fitting,and genetic algorithm optimization,and numerical analyses on the centrifugal compressor’s aerodynamic performances and internal flow characteristics before and after optimization are carried out.The results show that the bionic impeller combined with the optimized meridian flow passage parameters significantly improves the internal flow field and the aerodynamic performances of centrifugal compressor.The polytropic efficiency and the pressure ratio of the optimized centrifugal compressor increase by 3.16%and 2.61%respectively under the design condition.The high entropy regions inside the impeller and at the blade diffuser outlet are reduced,and the flow separation is effectively suppressed.At the same time,the load on the blade surface increases and is more evenly distributed,and the work ability of the impeller is enhanced.
作者
周逸伦
孙永瑞
胡付佳
谭佳健
杨树华
刘小民
ZHOU Yilun;SUN Yongrui;HU Fujia;TAN Jiajian;YANG Shuhua;LIU Xiaomin(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shenyang Blower Works Group Corporation,Shenyang 110027,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2023年第7期151-159,共9页
Journal of Xi'an Jiaotong University
基金
国家重点研发计划资助项目(2019YFB1504601)
沈鼓集团-西安交大研究院专项基金指资助项目(20210313-2KT05)。
关键词
离心压缩机
叶轮
仿生设计
参数优化
气动性能
centrifugal compressor
impeller
bionics design
parameter optimization
aerodynamic performance
