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首页> 外文期刊>Combustion Science and Technology >PREDICTING THE LENGTH OF LOW-MOMENTUM JET DIFFUSION FLAMES IN CROSSFLOW
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PREDICTING THE LENGTH OF LOW-MOMENTUM JET DIFFUSION FLAMES IN CROSSFLOW

机译:预测横流中低动量射流扩散火焰的长度

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摘要

A phenomenological model is presented for predicting the size of low-momentum jet diffusion flame in crossflow. This model relates the length of the flame (L_f) to the diameter of the issuing jet (d_s), the exit velocity (V_j) and density (ρ_j) of the jet gases, the crossflow velocity (U_∞), and dilution of the fuel by an inert gas. Flame shape and size are modeled with two basic principles: flame shape is set by the fuel jet and crossflow properties and flame size is set by the timescale for the stoichiometric amount of oxygen to mix with the fuel jet. Experimental data are presented in which d_s, V_j, U_∞, and fuel jet dilution were all varied. The data show two regimes in which flame length either increases or decreases with increasing crossflow velocity. The predicted flame lengths agree with the measurements, within a root-mean-square error of 15%.
机译:提出了一种现象学模型,用于预测横流中低动量射流扩散火焰的大小。该模型将火焰的长度(L_f)与射流的直径(d_s),射流气体的出口速度(V_j)和密度(ρ_j),横流速度(U_∞)以及稀释度相关联用惰性气体作燃料。火焰形状和大小是通过两个基本原理建模的:由燃料喷射器设置火焰形状和错流特性,由与燃料喷射器混合的化学计量量的氧气的时间尺度设置火焰大小。给出了实验数据,其中d_s,V_j,U_∞和燃料喷射稀释均发生了变化。数据显示了两种情况,其中火焰长度随着横流速度的增加而增加或减少。预测的火焰长度与测量结果一致,均方根误差为15%。

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