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Numerical modelling of forced convection in a cavity due to finite heat sources.

机译：由于有限热源而在腔体内进行强制对流的数值模型。

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摘要

The problem of forced convection in a cavity is very well know and widely studied in the field of fluid mechanics. Numerous numerical techniques are present in literature which successfully simulate the fluid flow in a cavity up to a certain degree of accuracy. This present study is inspired by the physical phenomenon of fire in a ventilated aircraft cabin. Fluid flow inside a cavity is simulated numerically and the boussinesq approximation is considered in all the simulations. The governing equations and boundary conditions are solved using a commercially available code, namely Ansys Fluent. Benchmarking is done by solving the classic problem of a differentially heated two dimensional enclosed cavity. In first part of this study a rectangular cavity with vents is considered. Heat flux is applied to the bottom wall of the cavity. The inlet velocity and the heat flux applied are considered as parameters in the simulation. Different configurations of the cavity are considered by changing the location of the inlet and outlet vents. The simulations run are laminar as well as steady state in nature. The effects of buoyancy for varying heat fluxes are considered in detail. Comparative studies are done to find the best configuration in terms of heat removal. The second part of this study involves the numerical simulation of forced convection in a two dimensional aircraft fuselage cross-section with contains two seats. The seats are modeled as zero thickness walls and a temperature gradient is created by applying heat flux to them. The simulations are transient as well as turbulent in nature. Different configurations of the cross- iii section are considered. The velocity vector fields and the temperature contours are studied in detail. Comparative studies are done to find the most efficient configuration for heat removal.
机译：腔体内的强制对流问题是众所周知的，并且在流体力学领域已得到广泛研究。文献中存在许多数值技术，它们成功地模拟了空腔中的流体流动，并达到了一定的精度。本研究的灵感来自通风机舱中火灾的物理现象。对腔体内的流体流动进行了数值模拟，并在所有模拟中均考虑了boussinesq近似。控制方程和边界条件使用市售代码Ansys Fluent求解。通过解决差分加热的二维封闭腔的经典问题来完成基准测试。在本研究的第一部分中，考虑了带有通风孔的矩形空腔。热通量被施加到空腔的底壁。模拟中将入口速度和施加的热通量视为参数。通过改变进风口和出风口的位置，可以考虑腔体的不同配置。本质上，模拟运行是层流以及稳态的。详细考虑了浮力对不同热通量的影响。进行了比较研究，以找到散热方面的最佳配置。这项研究的第二部分涉及在二维飞机机身横截面中包含两个座位的强迫对流的数值模拟。将座椅建模为零厚度的壁，并通过向其施加热通量来创建温度梯度。模拟在本质上既是瞬态的，也是湍流的。考虑了截面iii的不同配置。详细研究了速度矢量场和温度轮廓。进行了比较研究，以找到最有效的排热配置。

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  • 作者

    Srigiriraju, Chandra Sekhar.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2015
  • 页码 51 p.
  • 总页数 51
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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