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首页> 外文期刊>Journal of Thermal Science and Engineering Applications: Transactions of the ASME >Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature
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Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature

机译：升高压力和高温多晶型燃烧器流动动力学的大型涡流仿真研究

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摘要

Large eddy simulation (LES) of nonreacting turbulent flow in a multiswirler model combustor is carried out at elevated pressure and high temperature. Flow interaction between the main stage and the pilot stage is discussed based on the time-averaged and instantaneous flowfield. Flow dynamics in the multiswirling flow are analyzed using a phase-averaged method. Proper orthogonal decomposition (POD) is used to extract dominant flow features in the multiswirling flow. Numerical results show that the main stage and the pilot stage flows interact with each other generating a complex flowfield. Flow interaction can be divided into three regions: converging region, merging region, and combined region. A precessing vortex core (PVC) is successfully captured in the pilot stage. PVC rotates with a first dominant frequency of 2756 Hz inducing asymmetric azimuthal flow instabilities in the pilot stage. POD analyses for the velocity fields also show dominant high-frequency modes (mode 1 and mode 2) in the pilot stage. However, the dominant energetic flow is damped rapidly downstream of the pilot stage such that it has a little effect on the main stage flow.
机译：在高温高温和高温下进行多漩涡燃烧器中的非反应湍流的大涡流仿真（LES）。基于时间平均和瞬时流场讨论主级和导频阶段之间的流动相互作用。使用相位平均方法分析多套流流动中的流动动力学。适当的正交分解（POD）用于在多漩殖流中提取显性流量特征。数值结果表明，主阶段和导频阶段流动与彼此相互作用，产生复杂的流场。流动交互可以分为三个区域：融合区域，合并区域和组合区域。在试验阶段成功捕获了预先涡旋核心（PVC）。 PVC以先导阶段诱导2756 Hz的第一个主导频率旋转，在试验阶段中诱导不对称的方位角流动不良。速度场的POD分析还在导频阶段显示主导的高频模式（模式1和模式2）。然而，显性能量流动在试验台的下游迅速阻尼，使得它对主级流动有点影响。

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