Numerical simulation of transonic compressor with inlet distortion based on body-force model
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摘要:
为快速评估进气畸变对压气机气动性能的影响,发展了一种基于体积力模型的进气畸变三维数值模拟方法。首先研究了体积力源项的建模理论和方法,并将该模型嵌入商业软件CFX中对Darmstadt单级跨声压气机在均匀进气条件下进行了计算及验证。进一步利用该方法对压气机在180°总温、总压畸变条件下的特性及流场进行了数值模拟,结果表明:该方法能再现进气畸变对压气机特性的影响,同时压气机内部畸变流场强三维特征与URANS(全环非定常)结果基本保持一致;在总温和总压畸变条件下,压气机与上游畸变流场的耦合作用趋势相反。相比URANS计算,该方法对计算资源的消耗能降低5个数量级,并能有效捕捉畸变流场在压气机内部的传递特征。
Abstract:In order to numerically study the impact of distorted inflow on a transonic compressor with less computational costs, a three-dimensional simulation method was developed based on body-force model (BFM). Firstly, the modeling method of building body-force source term was studied. The test data of the Darmstadt transonic compressor were used to verify the body-force model in performance prediction of the blade rows with clean inflow. Furthermore, steady simulations with a 180° circumferential total temperature and total pressure distortion were performed using BFM. This showed that the BFM can reproduce the distorted compressor characteristics. The evolution of the inlet distortion through the compressor and the circumferential phase change of the total temperature across the rotor were in line with unsteady Reynolds averaged Navier-Stockes (URANS). Under inlet total temperature and pressure distortion, the coupling trend of compressor and upstream distorted flow field was opposite. Compared with URANS, the BFM can significantly reduce the computational costs by 5 orders of magnitude while effectively capturing the main flow features inside the compressor.
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Key words:
- compressor /
- inlet distortion /
- rapid assessment /
- body-force model /
- coupling effect /
- aerodynamic performance
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表 1 压气机基本参数
Table 1. Basic parameters of compressor
参数 数值 功率/kW 800 扭矩/(N·m) 350 最大转速/(r/min) 21000 转子最大直径/m 0.38 轮毂比 ~0.5 转子叶尖相对马赫数 ~1.4 -
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