Laser-induced incandescence (LII) was used to quantify the soot volume fraction in five piloted turbulent non-premixed C${}_2$H${}_4$-N${}_2$ jet flames at elevated pressures. In one series of flames, the bulk jet velocity was held constant as the pressure was increased from 1 bar (Re = 10,000) to 3 bar (Re = 30,000), and then 5 bar (Re = 50,000). In the other series, a Reynolds number of 10,000 was held constant at 1 bar, 3 bar, and 5 bar. LII measurements were calibrated with laminar diffusion flames at each pressure using 2D diffuse line-of-sight attenuation. Mean and RMS soot volume fractions along the flame centerline exhibit Gaussian profiles for all of the flames. The magnitude of soot volume fraction and the spatial soot distribution are enhanced by increases in pressure. In both series of flames, the peak mean soot volume fraction scales with the pressure as $p^{2.2}$. In the constant velocity series, the scaling drops to $p^{1.5}$ if the volume-integrated mean soot volume fraction on a per fuel mass basis is considered instead. At 3 bar, a threefold increase in Re leads to a decrease in the mean soot volume fraction despite the decrease in soot intermittency. At 5 bar, a fivefold increase in Re results in soot intermittency near zero at the flame’s center and a slight increase in the mean soot volume fraction.

激光诱导的白炽灯（LII）用于量化五种湍流非预混C中的烟灰体积分数${}_2$H${}_4$-N${}_2$在高压下喷射火焰。在一系列火焰中，当压力从1 bar（Re = 10,000）增加到3 bar（Re = 30,000），然后从5 bar（Re = 50,000）升高时，总体射流速度保持恒定。在其他系列中，雷诺数10,000保持恒定在1 bar，3 bar和5 bar。使用2D扩散视线衰减，在每个压力下使用层状扩散火焰校准LII测量。沿火焰中心线的平均和均方根烟灰体积分数显示了所有火焰的高斯分布。烟尘体积分数的大小和烟尘的空间分布通过压力的增加而增强。在这两种火焰中，峰值平均烟灰体积分数随压力的变化而变化。$p^{2.2}$。在等速序列中，比例下降到$p^{1.5}$如果改为考虑按每个燃料质量的体积积分平均烟so体积分数。在3 bar时，尽管烟尘间歇性降低，但Re的三倍增加导致平均烟尘体积分数降低。在5 bar下，Re的五倍增加会导致火焰中心的烟尘间歇性接近零，而平均烟尘体积分数则略有增加。