偏心对双级旋流器出口流场影响试验

为了研究双级旋流器在不同偏心量下的冷态流场变化,设计了4种偏心量(分别为0,0.5,1.0,1.7mm偏心)的双级旋流器试验件,并采用粒子图像测速仪(PIV),测量了不同偏心量下流场.试验结果表明:0.5mm偏心下的流场较无偏心下变化较小,但当偏心量大于0.5mm时,双级旋流器出口下游规则的双涡结构变得不对称,并且中心回流区变窄,流场与无偏心下相比差别较大;偏心对双级旋流器出口下游径向速度分布影响较大,在双级旋流器出口X/D=0.5轴向位置附近,当偏心量大于0.5mm时气流径向速度分量变为正向峰值. 

Experiment on effect of misalignment on outlet flow field of double-swirler

In order to study the flow field characteristics downstream a double-swirler outlet, four double-swirler configurations with different misaligned dimensions (0,0.5,1.0,1.7mm) were designed. The no-reacting flow field of different misaligned dimensions was obtained by PIV. Expermental result shows that there is no significant difference in the flow field between misaligned dimension of 0mm and 0.5mm. In the configurations of misaligned dimension larger than 0.5mm, the double-vortex construction and the central recirculation zone downstream the double-swirler outlet become asymmetrical and narrow respectively. The flow filed show obvious deviation from the one of 0mm misaligned dimension. Misalignment has a pronounced influence on the radial velocity profile downstream the double-swirler outlet. The radial velocity around the axial location of X/D=0.5 is converted into peak and positive value when misaligned dimension is larger than 0.5mm.