热声发动机在低温余热利用方面的研究

Experimental investigation on thermo-acoustic engine

以低温排热的有效利用为目的,设计制作了一台热声发动机的实验样机。通过实验,揭示了热声自激振动与热声强制振动现象发生的条件与机理,研究了热声发动机的关键部件——板叠的形状与材质对系统的起振温度的影响。结果表明,合理设计板叠的结构和合理选择板叠的材料,可以使得系统在较低的温度下起振。系统的最低起振动温度约为60℃。而从热声振动的方式来看,强制振动比自激振动具有更低的起振温度。

For saving energy with waste heat recovery, thermo-acoustic engine is a promising way due to its simple structure, absence of pollution and low cost. The present experimental study investigated the mechanism of the self-exciting thermo-acoustic oscillation and the forced thermo-acoustic oscillation. In addition, the effects of stack structure and material property on the performance of the thermo-acoustic engine in terms of the critical temperature ratio were examined. It was found that the forced thermo-acoustic oscillation had much lower critical temperature for initiation and the minimal temperature was only 60℃. Ceramic material had better performance than steel and copper and the shorter the stack, the lower the initial temperature for oscillation.