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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental analysis of the flowfield at the exit of a premixer for combustion applications
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Experimental analysis of the flowfield at the exit of a premixer for combustion applications

机译：用于燃烧应用的预混器出口处流场的实验分析

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摘要

The flowfield at the exit of a premixer for combustion applications is experimentally studied under isothermal conditions. The premixer produces a main swirling flow, while an injector, positioned on the jet axis, generates four jets in cross-flow mimicking the fuel introduction. The main nozzle has a variable geometry to simulate different operative conditions. Two configurations, in which the flow rate of the fuel cross-flow jets is varied, are examined. Mean and fluctuating streamwise velocity profiles, acquired by means of laser Doppler anemometry (LDA) at the exit plane of the premixer, are presented for all of the geometrical setups and compared with the surrogate fuel distribution at the exit plane. The mixing characterization is provided either by means of an intrusive gas sampling technique and non-intrusive flow-visualization analyses. Results show that the velocity flowfield is considerably affected by the relative strength of the fuel jets with respect to the main swirling flow, and by the boundary conditions at the nozzle exit. Comparison of the mixing and velocity data shows that for some configurations there is a matching between the streamwise velocity momentum and scalar distributions. Correspondingly, the fuel jets at the exit plane maintain a marked individuality. (C) 2004 Elsevier Inc. All rights reserved.
机译：在等温条件下通过实验研究了用于燃烧应用的预混合器出口处的流场。预混合器产生主旋流，而位于喷射轴上的喷射器则产生四股喷射流，模仿燃料的引入。主喷嘴的几何形状可变，可以模拟不同的工作条件。研究了两种构造，其中改变了燃料错流射流的流量。针对所有几何设置，给出了在预混合器出口平面上通过激光多普勒风速计（LDA）获取的平均和波动的流速速度分布图，并将其与出口平面上的替代燃料分布进行了比较。通过侵入式气体采样技术和非侵入式流动可视化分析来提供混合特性。结果表明，速度流场受燃料射流相对于主旋流的相对强度以及喷嘴出口处的边界条件的影响很大。混合和速度数据的比较表明，对于某些配置，沿流速度动量和标量分布之间存在匹配。相应地，在出口平面处的燃料喷嘴保持明显的个性。 （C）2004 Elsevier Inc.保留所有权利。

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