摘要
分液器是制冷系统中重要的辅助设备,分液不均会引起换热器面积不能充分利用,制冷能力下降,蒸发器出风温度不均,膨胀阀阀芯振动等问题,合理选择和设计分液器对制冷系统高效运行有着重要的意义.文中介绍了压降式、离心式和贮液式三种分液器的工作原理,并且通过实验定量地研究了质量流量50～ 110 kg/h,入口干度0.1～0.3工作条件下,质量流量和入口干度对三种分液器分配特性的影响,引入各支路间质量和干度的标准偏差STDm和STDx评估分液均匀性.实验结果表明,当质量流量从50 kg/h增大到110 kg/h时,三种分液器的STDm减小,质量流量的均匀性得到改善.其中对压降型和离心式的影响较大,STDm分别降低了77％和51％,而对贮液型的影响较小,STDm降低了21％.当入口干度增大时,分液均匀性有所下降.
Refrigeration mal - distribution in a distributor located at the inlet of a heater exchanger plays an important role in the heat ex- changer performance. This paper proposes a test method to measure the mass flow rate and quality of each branch tube after distributor. Three types of distributors （pressure drop; centrifugal and reservoir） were manufactured and tested. It was found that with the increase of mass flow rate, the performance of distributor improved. The pressure drop and centrifugal type is more sensitive than reservoir one. With the increase of inlet quality, the performance of distribution deteriorates. The flow behavior of two - phase refrigerant such as phase distri- bution and separation phenomena was studied by CFD, which helped investigate how the geometry factors influence the distribution per- formance.
出处
《制冷学报》
CAS
CSCD
北大核心
2014年第3期1-7,共7页
Journal of Refrigeration
基金
国家科技支撑计划(2012BAF01B06)资助项目~~
关键词
分液器
两相流
分配均匀性
CFD
distributor
two-phase
distribution uniformity
CFD
