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首页> 外文期刊>Energy Conversion & Management >Heat flux and acoustic power in a convection-driven T-shaped thermoacoustic system
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Heat flux and acoustic power in a convection-driven T-shaped thermoacoustic system

机译：对流驱动的T形热声系统中的热通量和声功率

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摘要

The present work considers a convection-driven T-shaped standing-wave thermoacoustic system. To gain insights on the conversion process of heat to sound and to study the nonlinear coupling between unsteady heat release and acoustic disturbances, thermodynamic analysis, numerical and experimental investigations are conducted. Three parameters are examined: (1) the inlet flow velocity, (2) heater temperature and (3) heat source location. Their effects on triggering limit cycle oscillations are first investigated in 2D numerical model. As each of the parameters is varied, the head-driven acoustic signature is found to change. The main nonlinearity is identified in the heat fluxes. To characterize the transient (growing) behavior of the pressure fluctuation, the thermoacoustic mode growth rate is defined and calculated. It is found that the growth rate decreases first and then 'saturates'. Similar behavior is observed by examining the slope of Rayleigh index. Furthermore, the overall efficiency of converting the input thermal energy into acoustical energy is defined and calculated. It is found that the energy conversion efficiency can be increased by increasing the inlet flow velocity. To validate our numerical findings, a cylindrical T-shaped duct made of quartz-glass with a metal gauze attaching on top of a Bunsen burner is designed and tested. Supercritical bifurcation is observed. And the experimental measurements show a good agreement with the numerical results in terms of mode frequency, mode shape, sound pressure level and Hopf bifurcation behavior.
机译：目前的工作考虑对流驱动的T形驻波热声系统。为了深入了解热到声音的转换过程，并研究非稳态热释放和声干扰之间的非线性耦合，进行了热力学分析，数值和实验研究。检查了三个参数：（1）入口流速，（2）加热器温度和（3）热源位置。首先在二维数值模型中研究了它们对触发极限循环振荡的影响。随着每个参数的变化，发现头部驱动的声学特征发生变化。在热通量中识别出主要的非线性。为了表征压力波动的瞬态（增长）行为，定义并计算了热声模式的增长率。发现增长率首先下降，然后“饱和”。通过检查瑞利指数的斜率可以观察到类似的行为。此外，定义和计算将输入的热能转换成声能的总效率。发现通过增加入口流速可以提高能量转换效率。为了验证我们的数值结果，设计并测试了由石英玻璃制成的圆柱形T形风道，并在本生灯的顶部安装了金属丝网。观察到超临界分叉。实验测量结果与数值结果在模态频率，模态形状，声压级和霍普夫分叉行为方面具有很好的一致性。

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