Hybrid Reynolds-Averaged and Large-Eddy Simulations of a Supersonic Cavity Flameholder
Hybrid Reynolds-Averaged and Large-Eddy Simulations of a Supersonic Cavity Flameholder
复制标题
超音速腔火焰稳定器的混合雷诺平均和大涡模拟
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Tuttle
中科院分区：
文献类型：
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作者：
D. Peterson;M. Hagenmaier;C. Carter;S. Tuttle
给出了超声速空腔火焰座内非反应流动的数值模拟结果。自由流是2马赫的空气。模拟了一种不喷油情况和两种不同喷油率的情况，分别通过位于空腔背面的孔进行了模拟。模拟结果与在腔内对两个速度分量进行粒子图像测速测量的一系列实验相对应。reynolds -average Navier-Stokes模拟用于检验用于粒子图像测速的种子流的有限宽度，低角度槽的影响。模拟结果表明，播种器对腔内流动的影响很小，因此在其余模拟中可以忽略播种器。采用稳态reynolds -平均Navier-Stokes模拟、非定常混合reynolds -平均Navier-Stokes模拟和大涡模拟对腔内流动进行了模拟。提出了一个彻底的网格分辨率研究，其中确定了解决腔内流动所需的分辨率。最后网格上的模拟结果与实验速度测量结果进行了比较，发现雷诺-平均纳维-斯托克斯混合模拟结果和大涡模拟结果在流动的某些方面提供了更好的一致性。然后利用模拟结果研究了在实验中没有测量到的腔内混合。通过模拟得到的混合信息，可以进一步深入了解腔内火焰保持器流场的物理特性。
Simulation results are presented for non-reacting flow within a supersonic cavity flameholder. The freestream is air at Mach 2. A case is simulated with no fuel injection, and two cases are simulated with different rates of ethylene fuel injected through holes located on the back face of the cavity. The simulations correspond to a series of experiments for which particle image velocimetry measurements of two velocity components were made within the cavity. Reynolds-averaged Navier-Stokes simulations are used to examine the influence of the finite-width, low-angled slot used to seed the flow for the particle image velocimetry. The simulations indicate that the seeder has little influence on the flow within the cavity, allowing for the seeder to be neglected in the remainder of the simulations. The flow within the cavity is simulated using steady-state Reynolds-averaged Navier-Stokes simulations, as well as unsteady hybrid Reynolds-averaged Navier-Stokes and large-eddy simulations. A thorough grid resolution study is presented in which the resolution required to resolve the flow within the cavity is determined. The results of the simulations on the final grids are compared to the velocity measurements from the experiments and the hybrid Reynolds-averaged Navier-Stokes and large-eddy simulation results are found to provide improved agreement with certain aspects of the flow. The simulation results are then used to investigate the mixing within the cavity, which was not measured in the experiments. The mixing information from the simulations provides further insight into the physics of the cavity flameholder flowfield.