李垒,李庆普
LI Lei,LI Qingpu

• 1:枣庄学院机电工程学院
• 2:上海理工大学能源与动力工程学院
• 3:浙江大学机械与能源工程学院

摘要(Abstract)：

为了提高能源利用率,以喷射式制冷系统为载体对锅炉余热加以利用,并用试验方法对系统性能受运行变量的影响进行研究,从喷射器内流体流动机制上对试验结果进行分析,旨在为实现系统最佳运行环境确定、喷射器结构的最优化设计提供试验依据。试验结果显示:喷射系数和机械COP随发生温度的升高呈现先增加后减小的变化趋势,并与喷嘴喉部内径呈负相关,与蒸发温度、喷射器喉部直径呈正相关;此外,当冷凝温度小于某一值时,喷射系数受冷凝温度的影响很小,而当冷凝温度超过某一值时,喷射系数急剧降低;喷射系数随混合段喉部与喷嘴喉部面积比AR的增加而增大,可从喷射器结构参数对流体流动机制的影响进行解释。
In order to improve the energy efficiency utilization，the ejector refrigeration system was used as the carrier of the ejector refrigeration system，and the experimental method was used to study influence of operation variables on the system performance，and the experimental results were explained based on fluid flow mechanism inside the ejector with a view to providing experimental basis for realizing determination of optimal operating environment of the system and optimal design of the ejector structure.Experimental results show that the ejection factor and mechanical COP firstly increase and then decrease with the increase of generation temperature，and they are negatively correlated with nozzle throat diameter and are positively correlated with evaporation temperature and ejector throat diameter；in addition，the ejection factor is little affected by condensation temperature when the condensation temperature is less than a certain value，while the ejection factor decreases sharply with the increase of condensation temperature when the condensation temperature exceeds a certain value；the ejection factor increases with the increase of the area ratio AR between ejector throat and nozzle throat，which can be explained from influence of ejector structure on the fluidflow mechanism.

关键词(KeyWords)： 喷射系数;COP;发生温度;蒸发温度;冷凝温度;喉部内径
ejection factor;COP;generation temperature;evaporation temperature;condensation temperature;throat diameter

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51275152,51875167);; 上海市动力工程多相流动与传热实验室开放基金项目(13DZ2260900);; 河北省自然科学基金项目(2018202114)

作者(Author): 李垒,李庆普
LI Lei,LI Qingpu

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