燃烧室进口流场对某回流燃烧室性能影响的数值计算

为了获得燃烧室进口流场对某回流燃烧室性能的影响规律，通过在轴向扩压器上安装带偏转角度的导向叶片，获得不均匀的燃烧室进口流场。在试验验证的基础上，对均匀进气、导向叶片偏转角度25°及导向叶片偏转角度35°共计三种方案的燃烧室性能进行了数值模拟研究。结果表明:带偏转角度的导向叶片使燃烧室进口流场变得不均匀，燃烧室进口截面的气流具有一定的偏转角度和切向分速度；带偏转角度的导向叶片使主燃孔和掺混孔的进气存在一定的偏转角度，随着导向叶片偏转角度的加大，主燃孔和掺混孔的轴向速度小幅增加，主燃孔和掺混孔的切向速度逐渐加大且增幅较大；随着导向叶片偏转角度的加大，燃烧室总压恢复系数逐渐降低；带偏转角度的导向叶片对燃烧室的燃烧效率影响不大；随着导向叶片偏转角度的加大，燃烧室出口温度分布系数（OTDF）逐渐降低且降低幅度较大；在同一径向高度，随着导向叶片偏转角度的加大，燃烧室出口周向温度分布不均匀度逐渐降低。 

Numerical simulation on influence of flow field of combustor inlet on a certain reversed-flow combustor performance

The asymmetrical flow field of combustor inlet was obtained by which the oriented vane was installed in the axial diffuser of a reverse-flow combustor test piece, and how the combustor performance was affected by the variety of the combustor inlet flow field was simulated based on experiments verification, and the scheme included no vane, vane deflexion angle of 25° and vane deflexion angle of 35°. The results indicate that the unevenness of the flow field of the combustor inlet is caused by the oriented vane with deflection angle. The flow of combustor inlet takes on a certain deflexion angle and tangential velocity. The airflow direction of the primary holes and dilution holes has a deflexion angle. When the deflexion angle of the oriented vane increases, the axial velocity of the primary holes and dilution holes increases to a certain extent, and the tangential velocity of the primary holes and dilution holes increases greatly. The total pressure recovery coefficient decreases when the deflexion angle of the oriented vane increases. With the increase of deflection angle of the oriented vane, the combustion efficiency is invariable basically. The outlet temperature distribution factor(OTDF) decreases greatly, and the temperature circumferential distribution unevenness decreases at the same radial height.