Computation of phonation aeroacoustics by an INS/PCE splitting method
Computation of phonation aeroacoustics by an INS/PCE splitting method
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DOI：
10.1016/j.compfluid.2007.12.002
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发表时间：
2008-12-01
影响因子：
2.8
通讯作者：
Moon, Young J.
中科院分区：
文献类型：
--
作者：
Bae, Youngmin;Moon, Young J.
在本研究中，利用INS/PCE分割方法来计算最大速度小于0.1马赫数的脉动气流在声门内产生的声音。声场是通过求解扰动可压缩方程（PCE）来计算的，声源是由不可压缩的Navier-Stokes方程（INS）得到的瞬态水动力解获得的。控制方程采用六阶紧凑格式进行空间离散，并采用四阶龙格-库塔法进行时间积分。计算结果表明，话音质量与脉动射流剪切层的旋涡结构密切相关，射流特性由其局部雷诺数、脉动频率（或基频）和声门闭合决定。研究还发现，声门的旋转运动通过改变声带前后缘之间的气流分离点来控制声门阻抗，从而提高了声门作为发声器在发声过程中的机械效率。(C) 2007 Elsevier Ltd.版权所有。
In this study, an INS/PCE splitting method is exploited to compute vocal sound generated within the glottis by a pulsating air jet at maximum speed less than Mach number of 0.1. The acoustic field is computed by solving the perturbed compressible equations (PCE), with acoustic sources acquired from the transient hydrodynamic solutions obtained by the incompressible Navier-Stokes equations (INS). The governing equations are spatially discretized with a sixth-order compact scheme and time-integrated by a four-stage Runge-Kutta method. The computed results show that a voice quality is closely related to the vortical structure in the shear layer of the pulsating jet and the jet characteristics are determined by its local Reynolds number, pulsating frequency (or fundamental frequency), and glottis closure. It is also found that the rotational motion of the glottis controls the glottal impedance by changing the flow separation points between the leading- and trailing-edge of the vocal folds and this increases the mechanical efficiency of the glottis as a sound generator in the phonation process. (C) 2007 Elsevier Ltd. All rights reserved.