Ejector performance prediction at critical and subcritical operational modes

Ejector performance prediction at critical and subcritical operational modes
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临界和亚临界运行模式下的喷射器性能预测

DOI:
10.1016/j.applthermaleng.2016.12.116
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发表时间:
2017-03
影响因子:
6.4
通讯作者:
Jae-Myung Lee
Jae-Myung Lee
中科院分区:
工程技术2区
文献类型:
--
作者:
Fenglei Li;Qi Tian;Changzhi Wu;Xiangyu Wang;Jae-Myung Lee

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传统的喷射器模型侧重于设计条件下临界模式下的喷射器性能预测。事实上,喷射系统无法在这些条件下完美运行。因此,非设计条件下亚临界模式喷射器性能的研究非常重要。在本文中,基于恒压混合和恒压干扰假设,开发了喷射器在临界点和故障点性能预测的新模型。然后,将这两个模型集成为预测临界和亚临界运行模式下喷射器性能的模型。为了确定模型中喷射器组件的效率,引入了一个新颖的概念,即效率变化效应(EOC),以识别显着影响喷射器性能的效率。然后,通过稀疏增强优化方法确定所识别的效率。我们的模型获得的预测结果比现有方法获得的预测结果要准确得多。
Traditional ejector models are focusing on the ejector performance predictions at critical mode under design conditions. In reality, ejector systems cannot be operated under these conditions perfectly. Thus, the study of ejector performance at subcritical mode under off-design conditions is important. In this paper, novel models for ejector performance predictions at critical point and breakdown point are developed based on constant-pressure mixing and constant-pressure disturbing assumptions. Then, the two models are integrated as the model to predict ejector performance at critical and subcritical operational modes. In order to determine the ejector component efficiencies in the models, a novel concept, the effect of the change (EOC) of efficiency, is introduced to identify the efficiencies which affect ejector performance significantly. Then, the identified efficiencies are determined by sparsity-enhanced optimization method. The predicted results obtained by our model are much more accurate than those obtained by existing methods.
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