论文部分内容阅读
利用数值模拟方法考察根部风对所设计的燃油旋流燃烧器在增压条件下气流特性的影响。通过分析不同根部风流通面积对应的回流区分布、速度分布和阻力特性等情况,得出:本旋流燃烧器根部风对增压气流特性的影响主要体现在根部流通风量的大小,即稳燃器开孔面积的大小,与开孔方式及单个孔径的大小无关,其中开孔面积与稳燃器表面积之比f/F=0.18为最佳参数;不同根部风流通面积对应的各代表性截面轴向速度分布均呈“M”型,切向速度分布均呈“N”型;当f/F=0时,中心回流区滞止点的位置相比于f/F=0.18和f/F=0.36时滞后了0.17,而当f/F=0.54时,中心回流区无滞止点;空气流经叶片和稳燃器部位的阻力损失占总阻力损失的比例最高,总流动阻力与根部风流通面积呈单调下降的线性关系,阻力系数计算值与试验值的相对误差均小于2%,进一步证明了所选计算模型的合理性。
The effects of root wind on the gas flow characteristics of the designed fuel swirl combustor under pressurized conditions were investigated by numerical simulation. By analyzing the distribution of backflow zone, velocity distribution and resistance characteristic of different circulation area, it is concluded that the influence of the root wind of the swirl burner on the characteristics of the pressurized air flow is mainly reflected in the size of the ventilation flow at the root, that is, the steady combustion The size of the opening area of the device is independent of the opening style and the size of the single aperture. The ratio of open area to the surface area of the burner f / F = 0.18 is the best parameter. The representative cross-sections The axial velocity distribution was “M” and the tangential velocity distribution was “N”. When f / F = 0, the stagnation point in the central reflow zone was compared with the f / F = 0.18 And f / F = 0.36, the time lag is 0.17, while when f / F = 0.54, there is no stagnation point in the central recirculation zone; the ratio of the resistance loss of the air flowing through the blade and the stabilizer part to the total resistance loss is the highest, The resistance and root ventilation area showed a monotonous decreasing linear relationship, and the relative errors between calculated and tested values of resistance coefficient were less than 2%, which further proved the rationality of the selected calculation model.