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内外流场耦合法数值研究Rijke管声学特性 总被引:1,自引:0,他引:1
基于流体力学、传热学和声学研究成果,采用内外流场耦合建模的方法研究Rijke管脉动内流场,解决了大振幅驻波热声场管口边界条件的处理和出现数值发散的问题。从能量平衡的角度出发,提出非定常的热流量与声压、质点振速之间关系的假设。依靠自身参量,如气体的脉动压力、脉动流速和温度波动,来激发Rijke管振荡.模拟了Rijke管的声学特性,分析了Rijke管自激励振荡的机理。运用该模拟方法对不同尺寸、不同管口形状的Rijke管进行了数值实验,模拟结果与实验结果较好吻合,能捕捉Rijke管的管口声学特征量。 相似文献
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A mathematical model was developed to simulate two-phase gas-dispersed flow moving through a pipe with axisymmetric sudden
expansion. In the model, the two-fluid Euler approach was used. The model is based on solving Reynolds-averaged Navier — Stokes
equations for a two-phase stream. In calculating the fluctuating characteristics of the dispersed phase, equations borrowed
from the models by Simonin (1991), Zaichik et al. (1994), and Derevich (2002) were used. Results of a comparative analysis
with previously reported experimental and numerical data on two-phase flows with separation past sudden expansion in a plane
channel and in a pipe are given.
This work was supported by the President of the Russian Federation through the Foundation for Young Candidates of Sciences
under Grant MK-186.2007.8 and by the Russian Foundation for Basic Research (Grants Nos. 05-08-33586 and 06-08-00967). 相似文献
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具有旋涡的翼型绕流辐射声场的数值研究 总被引:1,自引:0,他引:1
本文运用面无法和涡声理论数值来研究具有旋涡的NASAGA(W)-1型翼型绕流的流场和辐射声场,这对于提高透平机械的效率及降低辐射噪声很有帮助。采用作者积累的关于面无法的一些计算技巧,首先成功地求解了不同攻角来流时的流场,再用涡声理论计算了涡旋绕过翼型时声压场的变化及声源的指向性,最后给出了有关这种流动噪声的发声机理和声源特性的一些有用的结论。 相似文献
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以冷藏展示柜强制冷却冷凝器的冷却风道为对象,建立了物理数学模型,用SIMPLE方法计算了3种型式冷凝器冷却风道空气流场,通过速度分布图和速度矢量图分析了各型式风道冷凝器和压缩机冷却效果,结合冷藏展示柜的结构和实际应用提出了冷却风道优化的方向,为冷藏展示柜的优化设计提供了参考. 相似文献
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Journal of Visualization - Noise from jet engines can be reduced by means of a Helmholtz cavity configuration. The resonance that occurs when a flow passes the neck of the Helmholtz resonator will... 相似文献