90 弯头内流体压力脉动特性的大涡数值模拟
首发时间:2015-09-06
摘要:以90 弯头在高温气冷堆内的特殊应用为背景,运用大涡模拟方法对90 弯头内的复杂流场进行了数值模拟,并将时均化处理后的结果与实验结果以及RANS稳态模拟结果进行了综合对比。通过对内、外弧面特定监测点的压力脉动信号进行功率谱密度分析,研究了在流动分离和二次流共同作用下弯头内压力脉动的特点。研究结果表明,压力脉动在内、外弧面上的成因不同。内弧面上最大压力脉动功率出现在弯曲角度50 附近区域,主要由流动分离和涡脱落引起;外弧面上最大压力脉动功率出现在弯曲角度12 附近区域,由流体与外弧面的冲击作用引起。
关键词: 10MW高温气冷堆 90 弯头 大涡模拟 压力脉动
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Large eddy simulation of the pressure fluctuation in 90 degree elbow pipe
Abstract:Based on the special application of 90 degree elbow pipe in the 10MW high temperature gas cooled reactor (HTR-10), large eddy simulation was used to compute the complex flow field in 90 degree elbow pipe. The time-averaged pressure value of LES instantaneous results was compared with the experimental results and the RANS results. The pressure fluctuation signal of the specific test point on intrados and extrados was processed by Fourier transform to get the power spectral density. Under the influence of impact effect, flow separation and the secondary flow, the pressure fluctuation behaves differently on intrados and extrados. Pressure fluctuation on intrados is caused by flow separation and vortex-shedding, and the maximum fluctuation amplitude occurs at the bending angle of 50 degree. On extrados, it is induced by the impact effect, and the maximum fluctuation amplitude occurs at the bending angle of 12 degree.
Keywords: HTR-10 90 degree elbow pipe large eddy simulation pressure fluctuation
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