摘要
为满足超低温加工中液氮射流稳定可调的需求,基于漂移通量模型研究了液氮两相流管路内流动机理,提出了增大管路热阻、改变管路局部阻力损失系数来调节液氮质量流量的液氮稳定传输射流调节策略。基于AMESIM仿真平台建立了换热管路液氮两相流模型,验证了管路中传感器布置方法的合理性,分析了液氮两相流流动规律和射流流量的可控性,设计了集液氮传输、状态监测、流量控制于一体的液氮稳定传输射流调控装置。结果表明,管路整体隔热效果良好,改变调节阀开度可有效地调节射流流量,采用合适的控制方法可以维持中低流量下液氮射流的相对稳定。
In order to meet the demand of stable and adjustable liquid nitrogen(LN2)jet-flow in cryogenic machining,the two-phase flow mechanism of LN2 in pipeline was studied based on drift flux model.The adjustment strategy of stable transport and jet-flow was proposed by increasing the thermal resistance of pipeline and changing the local resistance loss coefficient of pipeline.Based on AMESIM simulation platform,a two-phase flow model of LN2 in heat exchange pipeline was established,which verified the rationality of sensor arrangement method in the pipeline,analyzed the two-phase flow law of LN2 and the controllability of jet flow.Finally a device which integrates liquid nitrogen transport,condition monitoring and flow control is designed.The results show that the overall heat insulation effect of the pipeline is good,changing the opening of the control valve can effectively adjust the jet flow,and adopting appropriate control methods can maintain the relative stability of the liquid nitrogen jet under low and medium flow.
作者
孔繁泽
杨子健
王永青
刘阔
KONG Fan-ze;YANG Zi-jian;WANG Yong-qing;LIU Kuo(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《组合机床与自动化加工技术》
北大核心
2022年第1期112-115,121,共5页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家重点研发计划项目(2019YFB2005400)
大连市高层次人才创新支持计划(2018RD05)
长江学者特聘教授奖励计划(T2017030)。
