Pareja Jhon, Lipkowicz Timo, Inanc Eray, Carter Campbell D, Kempf Andreas, Boxx Isaac
Institute of Combustion Technology, German Aerospace Center (DLR), 70569 Stuttgart, Germany.
Chair of Fluid Dynamics, Institute for Combustion and Gasdynamics (IVG), Universität Duisburg-Essen, Duisburg, Germany.
Exp Fluids. 2022;63(1):33. doi: 10.1007/s00348-021-03377-3. Epub 2022 Jan 24.
In this paper, an experimental study of the non-reacting turbulent flow field characteristics of a piloted premixed Bunsen burner designed for operational at elevated pressure conditions is presented. The generated turbulent flow fields were experimentally investigated at atmospheric and elevated pressure by means of high-speed particle image velocimetry (PIV). The in-nozzle flow through the burner was computed using large-eddy simulation (LES), and the turbulent flow field predicted at the burner exit was compared against the experimental results. The findings show that the burner yields a reasonably homogeneous, nearly isotropic turbulence at the nozzle exit with highly reproducible boundary conditions that can be well predicted by numerical simulations. Similar levels of turbulence intensities and turbulent length scales were obtained at varied pressures and bulk velocities with turbulent Reynolds numbers up to 5300. This work demonstrates the burner's potential for the study of premixed flames subject to intermediate and extreme turbulence at the elevated pressure conditions found in gas turbine combustors.
本文介绍了一种为在高压条件下运行而设计的引射式预混本生灯非反应湍流流场特性的实验研究。通过高速粒子图像测速技术（PIV），在大气压力和高压条件下对产生的湍流流场进行了实验研究。利用大涡模拟（LES）计算了通过燃烧器的喷嘴内流动，并将燃烧器出口处预测的湍流流场与实验结果进行了比较。研究结果表明，该燃烧器在喷嘴出口处产生了相当均匀、近乎各向同性的湍流，具有高度可重复的边界条件，数值模拟能够很好地预测这些条件。在不同压力和体速度下，湍流雷诺数高达5300时，获得了相似水平的湍流强度和湍流长度尺度。这项工作证明了该燃烧器在研究燃气轮机燃烧室中高压条件下受中等和极端湍流影响的预混火焰方面的潜力。
