进口不均匀来流下典型稳定器流场特性研究

Investigation on the flow field characteristics of typical flameholder with non-uniform inflow

为探究加力燃烧室典型稳定器在近似真实来流进口条件下的流场特性,通过用户自定义函数给定进口边界非均匀进气条件(包括速度不均匀和余旋角不均匀),采用雷诺平均方法对某一体化模型加力燃烧室典型稳定器的冷态流场进行了数值模拟,获得了一体化加力燃烧室流场结构、总压损失、流阻损失系数等特征。数值计算结果表明:1)凹腔-中心锥回流区轮廓随速度不均匀度增加而逐渐增大,支板后回流区轮廓随速度不均匀度增加而减小;随余旋角不均匀度增大,凹腔-中心锥回流区轮廓向内缩小,而支板后回流区沿径向向内增大;2)余旋角度大于15°时,支板整流性能显著减弱,在支板压力面气流分离形成回流区,增大燃烧室流动损失;3)随着速度不均匀度或余旋角不均匀度的增加,总压损失及流阻损失系数增大;此外,余旋角度将会增加速度的变化率。

In order to investigate the flow field characteristics of the typical stabilizer of afterburner under the inlet conditions similar to the actual incoming flow,the non-uniform inlet conditions(including non-uniform velocity and non-uniform cosine rotation angle)were given through the user-defined function.Then the cold flow field of the typical stabilizer of an integrated model was numerically simulated using the Reynolds average method.The flow field,total pressure loss and flow resistance loss coefficient were studied.The numerical results showed that:1)The recirculation zone of the cavity on central cone wall increased gradually with the increase of the velocity non-uniformity,while the recirculation zone of stabilizer decreased.With the increase of non-uniform cosine rotation angle,the reflux flow of the cavity of central cone decreased inward,while the reflux flow of stabilizer increased radially inward.2)When the cosine rotation angle was greater than 15°,the flow rectification performance of the stabilizer was significantly weakened,and the flow separation on the pressure surface formed a reflux zone,which increased the flow loss of afterburner.3)The total pressure loss and flow resistance loss coefficient increased with the increase of velocity nonuniformity and cosine rotation angle nonuniformity.In addition,the cosine rotation angle could increase the velocity variation rate.