热声发射换能器是一种新型的声发射装置。传统的薄膜发声换能器由电磁力引起的薄膜振动驱动，其原理是在固-液交界面上，流体质点和薄膜满足速度连续条件, 换言之，薄膜振动直接驱动了流体质点的位移场和速度场。而热声发射的原理完全不同，热声发射由可控热场激发，直接引起流体质点的运动。在宏观上，表现为固-液交界面处的流体膨胀和收缩。本文建立了粘性流场中碳纳米管球面薄膜热声发射的数学模型，改进了原有的气体热声数学模型，拓展了热声发射数学模型的应用范围。本文同时计算了内部有吸声介质的球面碳纳米管薄膜由正弦简谐热信号所激发的外声场，证明了热声发射的声压级(SPL)可以在较宽频带上保持不变。此外，本文进一步讨论了多种影响热声发射声压级的因素，对热声发射换能器的工程应用有一定的参考价值。

Thermoacoustic emission transducer is a novel device for acoustic emission. Thin-film acoustic transducer is traditionally driven by thin film oscillation due to electro-magnetic force. The principle is that the fluidic particles and the thin film share the same velocity on the solid-liquid interface. In other words, the displacement and velocity fields of fluidic particles are directly driven by thin-film vibration. However, the principle of thermo-acoustic emission is completely different. Thermo-acoustic emission is stimulated by controllable thermal field, which directly leads to the motion of fluidic particles. The fluidic expansion and contraction can be observed on the solid-liquid interface macroscopically. In this paper, a mathematical model for thermo-acoustic emission from carbon nanotube spherical films in viscous fluidic field is established, which improves the mathematical model for gaseous thermo-acoustics and expands the scope of thermo-acoustic application. In this paper，the external acoustic field from spherical carbon nanotube thin film is simultaneously calculated. The acoustic field is excited by sinusoidal harmonic thermal signal when inner sound absorbing medium exists. It is proved that the sound pressure level (SPL) of thermosacoustic emission can be flat in a wide frequency band. In addition, this paper further discusses a variety of factors affecting SPL for thermo-acoustic emission, which has certain reference value for thermo-acoustic emission in engineering.