• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Case Studies in Thermal Engineering >Heat transfer characteristics induced by multiple tandem elevated inclined jets sources in cross flows
【24h】

Heat transfer characteristics induced by multiple tandem elevated inclined jets sources in cross flows

机译：多个串联诱导的传热特性在交叉流动中升高的倾斜喷射源

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Consideration is given in this paper to the heat transfer induced in an elevated triplet-jet-group in cross flow numerical configuration. The jets are discharged from inclined, inline and elevated cylindrical ducts. We are particularly concerned with the generated aerothermic mixing, a critical and highly affecting parameter in the protection of turbine blade surfaces subject to high temperature levels, in the optimization of air-fuel mixing, and then combustion within scramjet combustors, in the reduction of noise by means of air curtains, etc. Since the generated heat fluxes are closely related to the interacting flows’ dynamics and corresponding turbulent features, we intend to bring here some clearance on the development of the aerothermic mixing of an elevated cascaded jet model within a cross flow. To reach our goal, a finite volume method is adopted to reproduce experimental data relative to three isothermal and 60°-inclined jets, placed three diameters apart, sent at a given height from the wind tunnel ground and discharged from similar elliptical cross-sections, under different injection ratios. A mesh sensibility study and different turbulence modeling tests were carried out to obtain the consistent validation of the jets’ velocities and trajectories. The first-order kω SST and the second-order RSM models gave particularly interesting results. Once a satisfactory agreement was achieved, a temperature difference between the jets and the mainstream was adopted to upgrade the model. We could then account for the induced heat transfer through the analysis of the reduced static temperature, a particularly interesting parameter for its closeness (if not similarity under some circumstances) to the film cooling efficiency.
机译：本文给出了考虑到在交叉流量数构型中升高的三重态喷射组中诱导的传热。喷射从倾斜，内联和升高的圆柱形管道排出。我们特别关注产生的空气热混合，临界和高度影响的涡轮机叶片表面，在高温水平经受高温水平的情况下，在空气 - 燃料混合的优化中，然后在扰乱燃烧器内燃烧，减少噪声通过空气窗帘等。由于产生的热通量与相互作用流动的动态和相应的湍流特征密切相关，我们打算在此处进行一些清关对十字架内升高的级联喷射模型的空气热混合的发展流动。为了实现我们的目标，采用有限体积的方法来再现三个等温和60° - 划线的喷射，将三个直径放置三个直径，在给定高度从风洞地面发送并从类似的椭圆形横截面排出，在不同的注射比率下。进行了网状敏感性研究和不同的湍流建模测试，以获得喷射速度和轨迹的一致验证。一阶KΩSST和二阶RSM模型具有特别有趣的结果。一旦实现了令人满意的协议，采用喷气机与主流之间的温差升级模型。然后，我们可以通过分析静态温度的分析来解释诱导的热传递，其近距离的近温度特别有趣（如果在某些情况下的情况下的话）到薄膜冷却效率。

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