...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Fluid Flow >Computational study of buoyancy effects in a laminar starting jet
【24h】

Computational study of buoyancy effects in a laminar starting jet

机译：层流起始射流浮力效应的计算研究

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

Vortical structures formed in evolving jets are important in applications such as fuel injection in diesel engines and fuel leaks. When the jet fluid is different from the ambient fluid, the buoyancy can play an important role in determining the jet flow structure, and hence, the entrainment and fluid mixing processes. In the present study, a jet of helium injected in air is investigated, with emphasis placed on delineating the buoyancy effects on vector-scalar fields during the starting phase. We utilize a computational model, previously validated to predict the flow field of low-density gas jets. The model incorporates finite volume approach to solve the transport equation of helium mass fraction coupled with conservation equations of mixture mass and momentum. Computations were performed for a laminar jet to characterize the advancing jet front, and to capture the formation and propagation of vortex rings and the related pinch-off process. Results show significant effects of buoyancy on jet advancement, as well as on vorticity and helium concentration in the core of the vortex rings.
机译：在诸如柴油发动机中的燃料喷射和燃料泄漏之类的应用中，由不断演变的射流形成的涡流结构很重要。当喷射流体与环境流体不同时，浮力在确定喷射流结构以及夹带和流体混合过程中起着重要作用。在本研究中，对注入空气中的氦气射流进行了研究，重点放在描述在起始阶段对矢量标量场的浮力效应。我们利用一个计算模型，该模型事先经过验证可以预测低密度气体射流的流场。该模型采用有限体积方法求解氦气质量分数的输运方程，以及混合质量和动量的守恒方程。对层流射流进行了计算，以表征前进的射流锋面，并捕获了涡流环的形成和传播以及相关的夹断过程。结果表明，浮力对射流的推进以及涡流环核心中的涡度和氦浓度具有显着影响。

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