摘要
针对换热器内部流动不均匀性、换热性能恶化的问题,对换热器的封头和导流片等入口段结构设计进行了研究,提出了换热器入口段结构与流动不均匀性的关联分析方法。通过对封头内部流动进行了CFD仿真分析,确定了导流片倾斜角、高度比等结构参数对流动不均匀性、换热损失的影响,建立了封头结构参数、导流片结构参数与换热效率间的关联模型。最后以换热损失最小为设计目标,进行了传统封头、二次型封头、改进二次型封头这3种形式入口段结构的参数优化设计。研究结果表明:改进二次型封头的内部流动不均匀性最小、换热效率最高,是换热器最佳入口段结构。
Aiming at the flow nonuniform and deteriorative performance in the heat exchanger,study on the unreasonable structure design of inlet header and deflector was carried out.An optimization design method of entrance structure was proposed to decrease the flow nonuniformity.Firstly,the flow of the internal header was analyzed using CFD simulation method,and the flow uniformity under different structure parameters of deflector were calculated.Then the correlation model among structure parameters of inlet header and deflector,thermal efficiency of heat exchanger was constructed.Finally,three types of entrance structure were optimized to decrease the heat loss of heat exchanger as traditional inlet header,modified inlet header,and second modified inlet header.The results indicate that second modified inlet header is the best head type.
作者
周思杭
彭翔
ZHOU Si-hang;PENG Xiang(CRRC. Hangzhou Co., Ltd., Hangzhou 310019, China;Key Lab. of E＆M. , Zhejiang University of Technology, Hangzhou 310014, China)
出处
《机电工程》
CAS
2017年第12期1427-1431,共5页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51505421)
关键词
换热器
封头
流动不均匀性
导流片
CFD
heat exchanger
inlet header
flow no-uniformity
deflector
CFD
