一类新型热声式换能器阵列的数值仿真

Numerical approach for a novel thermoacoustic transducer array

为解决一类碳纳米管(CNT)薄膜热声式换能器阵列激发声场的分析问题,利用COMSOL软件中的热黏性声学模块和压力声学模块对CNT薄膜阵列进行建模和激发声场求解,预测计算域内激发声场的声压大小和分布.研究结果表明:数值仿真的计算结果与现有解析解高度吻合,验证了所提出数值仿真方法的正确性和精确性.通过参数分析表明换能器阵列的单元间距和面积、封装气体声速、导热系数和密度对激发声场具有显著影响,是该类换能器阵列的设计和优化中的关键参数.

In order to solve the analysis problem of the excited acoustic field of carbon nanotube(CNT)film thermoacoustic transducer array,the thermal viscous acoustic module and pressure acoustic module in COMSOL are employed to establish the model of CNT film array and solve the excited acoustic field.The sound pressure and its distribution in the computational domain are accurately predicted by using the proposed method.The results show that the numerical simulations are in good agreement with the existing analytical solutions,which indicates the accuracy and validity of the proposed numerical method.In addition,it is found that the element spacing and area of the transducer array,the sound velocity,the thermal conductivity and the density of the encapsulated gas have significant influences on the excited acoustic field by parameter analysis,which demonstrates that they are the key parameters in the design and optimization of the transducer array.