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含油R32在压缩机吸气管内滞油影响因子和压降特性研究
胡晋珽,谷波,曾炜杰,张智铤,杜仲星
0
(上海交通大学机械与动力工程学院)
摘要:
本文对压缩机吸气管内R32/PVE VG68混合物的滞油和压降特性进行了实验研究。实验样品为内径10.7 mm的光滑铜管,在三种饱和温度和过热度条件下进行测试,分别为7.5/12 ℃、7.5/6 ℃、和10/12 ℃,制冷剂质流密度为90~230 kg/(m2?s),名义油质量分数(OMFno)为0~5%。同时,收集了5篇公开文献中R410A、R134a与各润滑油混合物在吸气管内的滞油量与压降数据,建立数据库,进行综合对比分析。结果表明:滞油量会随实际油质量分数和混合物运动黏度比的增加而增加,随质流密度的增加而减少。。最后,在对油运输机理分析的基础上,提出一种新的无量纲参数——滞油影响因子("ψ" )来描述油运输难度,这一参数综合了工质、几何尺寸及运行参数的影响,且与本实验和收集的滞油量数据呈现正相关的趋势。
关键词:  吸气管  润滑油  滞油量  压降  R32
DOI:
投稿时间:2021-08-31修订日期:2021-10-30
基金项目:国家自然科学基金(51976114)
Study on Oil Retention Impact Factor and Pressure Drop Characteristics of R32/PVE Mixture in Compressor Suction Line
Hu Jinting,Gu Bo,Zeng Weijie,Zhang Zhiting,Du Zhongxing
(School of Mechanical Engineering, Shanghai Jiao Tong University)
Abstract:
This paper presents an experimental study on the oil retention and pressure drop characteristics of an R32/PVE VG68 mixture in compressor suction lines. The test samples were two smooth copper pipes with horizontal and vertical flow orientations of 10.7 mm in inner diameter. The tested conditions are saturation temperature and superheating degree (7.5/12 ℃, 7.5/6 ℃, and 10/12 °C). The refrigerant mass flux and nominal oil mass fraction (OMFno) are varied in the ranges of 90-230 kg/(m2?s) and 0-5%, respectively. The results showed that the oil retention increased with the actual oil mass fraction and mixture kinematic viscosity ratio and decreased with the refrigerant mass flux. Two consolidated databases for oil retention and pressure drop of suction lines, which involved R410A and R134a, were collected from five existing studies for comparison. Finally, based on the analysis of the oil transport mechanism, a new dimensionless parameter called the oil retention impact factor was proposed to characterize the difficulty of oil transport, which integrates the influences of geometric dimensions, working pairs, and operation parameters. It showed a relatively good relationship with the oil retention data from the amassed database and the present study.
Key words:  suction line  lubricant oil  oil retention  pressure drop  R32

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