宗硕,宋昱龙,曹锋
ZONG Shuo,SONG Yulong,CAO Feng

• 1:西安交通大学

摘要(Abstract)：

随着欧盟F-Gas 517/2014法规的通过,CO_2(R744,CO_2)作为制冷剂已经成为目前的研究热点。为应对跨临界CO_2制冷、热泵系统中膨胀功损失问题,使用喷射器代替节流阀作为主要膨胀元件是常用方法之一。针对跨临界CO_2喷射器系统中喷射器调节问题,介绍了喷射器系统的运行特性,并回顾了系统中喷射器调节问题国内外的研究现状,总结了一些主流的调节方法和技术,包括改变喷嘴几何结构、采用可调喉部面积喷射器、采用多喷射器组合的方法等内容,并且对比分析了不同方法的优缺点。可调喉部面积法是调节给定工况下最优高压侧压力的有效方法,但指针的存在降低了喷射器效率。多喷射器组合的方法兼备工况的适应性、喷射器的高效性和控制的简易性。
With the adoption of the EU F-Gas Regulation 517/2014,carbon dioxide(R744,CO_2) as a refrigerant has become a current research hotspot. In order to deal with the problem of loss of expansion work in transcritical carbon dioxide refrigeration and heat pump systems,it is one of the common methods to use an ejector instead of a throttling valve as the main expansion element. For the problem of ejector adjustment in the transcritical CO_2 ejector system,the operating characteristics of the ejector system were introduced,and the research status of the ejector adjustment problem in the system was reviewed,and some mainstream adjustment methods and techniques were summarized,including changing the nozzle geometric structure,adopting adjustable throat area injectors,adopting multi-ejector solution,etc.,and the advantages and disadvantages of different methods were compared and analyzed.The adjustable throat area method is an effective method to adjust the optimal high-pressure side pressure under a given working condition,but the presence of the pointer reduces the ejector efficiency.The multi-ejector combination method has the adaptability of working conditions,the high efficiency of the ejector and the ease of control concurrently.

关键词(KeyWords)： 跨临界CO_2喷射器系统;多喷射器组合;可调喉部面积
transcritical CO_2 ejector system;multiple ejector solution;adjustable throat area

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年项目（52006161）

作者(Author): 宗硕,宋昱龙,曹锋
ZONG Shuo,SONG Yulong,CAO Feng

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