摘要
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。
By using the numerical simulation method,reviewed was the influence of the root air on the air flow characteristics of a fuel oil swirling burner thus designed under the supercharging condition. By analyzing the corresponding returning flow zone distribution,velocity distribution and resistance characteristics etc. in various flow areas for the root air,the authors concluded that for the swirling burner under discussion,the influence of the root air on the supercharged air flow characteristics mainly reflects the magnitude of the air quantity passing through the root,i. e. the opening area of the combustion stabilizer and is irrelevant to the mode for drilling holes and the diameter of a single hole. Among them,the ratio of the area of the holes and the surface area of the combustion stabilizer f / F = 0. 18 was regarded as the optimum parameter. The axial speed distribution on various representative sections corresponding to the various areas of the flow path for the root air all assumed a shape of ' M' while the tangential speed distribution took a shape of ' N'. When f / F = 0,the location of the stagnation point in the central returning flow zone lagged behind by 0. 17 as compared with those when f / F = 0. 18 and f / F = 0. 36. When f / F = 0. 54,there existed no stagnation point in the central returning flow zone. The resistance loss occurred during the air flowing through the locations of the blades and the combustion stabilizer occupied a highest proportion of the total resistance loss. Both the total flow resistance and the area of the flow path for the root air assumed a monotone descending linear relationship. The relative error of the resistance coefficient between the calculated value and the test one was invariably lower than 2%,further proving that the calculation model thus chosen is rational.
出处
《热能动力工程》
CAS
CSCD
北大核心
2014年第3期297-302,344-345,共6页
Journal of Engineering for Thermal Energy and Power
作者简介
张亮（1983-），男，天津人，中国船舶重工集团公司第七0三研究所工程师．
