Comparison of turbulence models for unsteady flow simulation in a long and narrow cabin
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摘要:
针对狭长型封闭舱室内非定常流动模拟的湍流模型选择问题，以飞机舱室为典型环境，使用相似准则为依据的热缩比法搭建了实验平台。将实验结果与RNG
k -ε 、DES、LES三种湍流模型的数值模拟结果进行对比和分析，评估狭长型封闭舱室内非定常流动特征研究中合适的湍流模型。结果显示，RNGk -ε 和DES模型可以定性描述流动变化趋势，但是LES模型在流场非定常性和不稳定性捕捉更为准确，其流场结构更接近实验结果。模拟结果与实验结果对比显示，LES模型能更加真实地反映狭长型封闭舱室非定常流动的情况。Abstract:Aiming at the problem of turbulence model selection for unsteady flow simulation in a long and narrow enclosed cabin, this study uses an aircraft cabin as a typical environment and uses the heat shrinkage ratio method based on similar criteria to build a simplified experimental platform. The experimental results are compared and analyzed with the numerical simulation results obtained by the three turbulence models of RNG
k -ε , DES and LES, and the appropriate turbulence model in the study of unsteady flow characteristics in the long and narrow enclosed cabin is evaluated. The results demonstrate that the RNGk -ε and DES models are capable of qualitatively describing the flow trend, but the LES model is more accurate in capturing the unpredictability and instability of the flow field, and its flow field structure is more in line with the experimental findings. Therefore, the LES model can more truly reflect the unsteady flow of the long and narrow enclosed cabin.-
Key words:
- numerical simulation /
- turbulence model /
- air distribution /
- scaled model /
- long-narrow cabin
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表 1 相似比例尺
Table 1. Similar scale
比例尺 几何比例尺$ {C_L} $ 速度比例尺$ {C_V} $ 流量比例尺$ {C_G} $ 流量比例尺$ {C_Q} $ 数值 $ 1:10 $ $ \sqrt {10} :10 $ $\sqrt {10} :1\;000$ $\sqrt {10} :1\;000$ 
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表 2 机舱实际与模型参数
Table 2. Actual and model parameters of cabin
模型 机舱长/
m纵横比 总风量/
（L·s−1）送风速度/
（m·s−1）总体发热量/
W机舱实型 30 10∶1 1579.2 1.15 16530 机舱模型 3 10∶1 5 0.36 50
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