...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Studies on the effects of varying secondary gas properties in a low entrainment ratio supersonic ejector
【24h】

Studies on the effects of varying secondary gas properties in a low entrainment ratio supersonic ejector

机译：低夹带比超声速喷射器中二次气体性质变化的影响研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A dilution cum purge ejector for application in fuel cells represents a domain of ejector operation involving low entrainment ratio with differing secondary and primary gas; which is hardly investigated and a cohesive design framework is not readily available. We comprehensively study a constant area ejector using analytical, experimental and numerical tools at low entrainment ratio (0.004-0.065) with Air, Helium and Argon as secondary gas while the primary gas is Air. For the first time, limits of operating parameters used in control volume method to design the ejector are found to be highly dependent on the secondary molecular weight. The entrainment ratio in the ejector (low for Helium and high for Argon) is affected by the molecular weight and the static pressure within the ejector (low for Air and high for Argon & Helium) by the gamma of the secondary gas. Sufficient suction pressure (0.3-0.55 bar) is generated by the ejector thereby preventing any backflow of secondary gas at all primary stagnation pressures (1.5, 2.2 and 3.1 bar). Numerical results agree well with experimental results. The ejector is shown to completely dilute and purge the secondary flow, meeting all key design requirements. (C) 2014 Elsevier Ltd. All rights reserved.
机译：用于燃料电池的稀释暨吹扫喷射器代表了喷射器的工作领域，该喷射器操作涉及低夹带率以及不同的二次气体和一次气体。很难对此进行研究，并且缺乏紧密的设计框架。我们使用分析，实验和数值工具，在低夹带率（0.004-0.065）下，使用空气，氦气和氩气作为次要气体，而主要气体为次要气体，全面研究了恒定面积喷射器。首次发现在控制体积法中设计喷射器时使用的操作参数极限高度依赖于次级分子量。喷射器中的夹带率（氦气低，氩气高）受分子量和喷射器内的静压（空气低，氩气和氦气高）受二次气体的伽马值影响。喷射器产生足够的吸入压力（0.3-0.55 bar），从而防止了在所有一次停滞压力（1.5、2.2和3.1 bar）下二次气体的任何回流。数值结果与实验结果吻合良好。显示出喷射器可以完全稀释和吹扫二次流，满足所有关键设计要求。 （C）2014 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号