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一种新的喷射器模型及其实验验证 被引量:4

Novel Ejector Model with Experimental Validation
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摘要 根据喷射器内的湍流流动特征,引入临界圆的概念,即引射流体在混合腔入口处马赫数为1的位置;依据管内流动的速度分布特点,定义了一个二维速度分布函数来近似喷射器内的实际速度分布;利用喷射器的进出口能量平衡方程,建立了一种新的喷射器模型.模型的计算过程非常简单,不需要迭代计算.相比于现有的一维喷射器模型,采用二维速度分布函数的新模型具有较高的精度,同时它只含有8个代数方程,有结构简单和便于应用的优点.采用低沸点的R141B作为工质,建立了一个喷射制冷循环的实验平台.实验验证结果显示,新模型预测引射系数的最大误差仅为-6.03%,因此可以用于对喷射器的性能进行仿真和预测. According to the turbulent flow behavior in the ejector, a critical circle at the entrance of mixing chamber is introduced, where the Mach number of entrained flow gets 1. Based on the characteristic of velocity distribution in a pipe, a 2D function is adopted to approximate the real velocity distribution inside the ejector. An overall energy conservation equation is used to com- plete the ejector mathematic model. Compared with the existing 1D models, the new model with the 2D velocity distribution function is more accurate. In addition, the new model is very simple which only consists of 8 algebraic equations and can be conveniently utilized for the performance prediction, and the effectiveness of the model is validated by the experiments.
出处 《西安交通大学学报》 EI CAS CSCD 北大核心 2008年第9期1096-1101,共6页 Journal of Xi'an Jiaotong University
基金 陕西省科学技术研究发展计划资助项目(2007K07-10) 2007年"国家建设高水平大学公派研究生项目"资助项目 长江学者和创新团队发展计划资助项目(IRT0746)
关键词 制冷 喷射器 模型 临界圆 refrigeration ejector model critical circle
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参考文献9

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