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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 >Soot concentration and primary particle size in swirl-stabilized non-premixed turbulent flames of ethylene and air
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Soot concentration and primary particle size in swirl-stabilized non-premixed turbulent flames of ethylene and air

机译：旋流稳定的非预混湍流火焰和空气中的烟灰浓度和初级粒度

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摘要

Turbulent non-premixed swirl-stabilized flames were investigated experimentally in a gas turbine model combustor with optical access. Velocity and soot concentration fields were measured for three levels of air flow for a fixed flow rate of ethylene as the fuel. Stereoscopic particle image velodmetry was used to get the three-dimensional velocity field data within the combustor. The time-averaged soot volume fractions and primary soot particles sizes were obtained using the laser induced incandescence technique. These two measurements were conducted separately, but under the identical experimental flow conditions. The velocity measurements showed a region of high velocity flow, sandwiched between inner and outer recirculation zones. The boundaries of the recirculation zones in all three cases displayed very high turbulence intensities. Most of the soot was found to be within the inner recirculation zone, and the regions having maximum time-averaged soot concentrations grew radially outward with axial height. The soot concentrations showed a strong dependence on air flow rate; a small increase in air flow rate caused a significant reduction in soot concentrations. The primary soot particle diameters inferred from laser induced incandescence measurements covered the range from 30 to 50 nm.
机译：在具有光学接入的燃气轮机模型燃烧器中实验研究了湍流的非预混旋涡稳定的火焰。测量速度和烟灰浓度场，用于为乙烯的固定流速作为燃料的固定流速。立体粒子图像VELODMERY用于获得燃烧器内的三维速度场数据。使用激光诱导的白炽技术获得时间平均烟灰体积分数和初级烟灰颗粒尺寸。这两种测量分别进行，但在相同的实验流动条件下。速度测量显示出高速流动区域，夹在内部和外再循环区域之间。所有三种情况下再循环区域的界限显示出非常高的湍流强度。发现大多数烟灰在内再循环区域内，并且具有最大时间平均烟灰浓度的区域以轴向高度径向向外而径向向外。烟灰浓度显示出对空气流速的强烈依赖;空气流速的小幅增加导致烟灰浓度显着降低。从激光诱导的白炽法测量中推断的初级烟灰粒径覆盖在30至50nm的范围内。

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