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研究了一种新型燃烧器的流场特性,其一次风分为内直流、外旋流2部分.采用5孔探针法和粒子图像测试技术测量一次风管模型的冷态射流场,并采用CFD软件进行数值模拟.对比分析了流场的时均分布和湍流特性(旋流强度、湍流强度、方向关联系数及湍动能等).结果表明:一次风的内直流部分使其具有一定的射流刚性,且没有中心回流区;外旋流部分对内、外侧气流的卷吸作用则使流场拥有较好的外部回流、整体混合及滞留特性;两者作用的相对强弱取决于叶片倾角及内外筒径比等.
The flow field characteristics of a new type of combustor were studied, the primary air was divided into two parts: internal direct current and external rotational flow, and the cold jet field of primary air duct model was measured by 5-hole probe method and particle image test technique CFD software was used to simulate the time-averaged and turbulent characteristics of the flow field (swirling intensity, turbulence intensity, directional correlation coefficient and turbulent kinetic energy). The results show that the inner DC part of the primary air has a certain jet Rigidity and no central backwash zone. The entrainment effect of the outer swirling flow on the inner and outer air flow makes the flow field have better external backflow, the overall mixing and retention characteristics; the relative strength of the two depends on the blade inclination and Inner and outer tube diameter ratio.