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热缓冲管是热声发动机的关键部件之一,位于高温换热器和次室温换热器之间,理想情况下可避免在高温换热器附近往复运动的气体接触室温环境,造成热量损失。不过由于换热器流道的特殊结构,使热缓冲管两端会产生射流等现象,带来流动紊乱、热量损失等问题。本文设计并搭建了研究热缓冲管损失的实验平台,主要考查在热缓冲管两端分别添加不同层流化丝网对系统性能的影响。实验结果表明,未添加层流化丝网会使热量损失急剧增大,热声效率大幅下降;而过多添加层流化丝网会使阻力损失增大,同样降低热声效率;当两端分别添加3片层流化丝网时,所需加热量最少,热声转换效率最高。
The thermal buffer tube is one of the key components of a thermoacoustic engine and is located between the high temperature heat exchanger and the sub-room temperature heat exchanger. Ideally, the hot buffer tube can avoid the contact of the gas reciprocating near the high temperature heat exchanger with the room temperature environment to cause the heat loss. However, due to the special structure of the flow passage of the heat exchanger, the phenomenon that jets are generated at both ends of the heat buffer tube brings about such problems as disorder of flow and heat loss. In this paper, we design and set up an experimental platform to study the thermal buffer tube loss, mainly examining the impact of adding different layers of fluidized mesh on the performance of the system at both ends of the thermal buffer tube. The experimental results show that the loss of heat loss increases sharply and the thermoacoustic efficiency decreases sharply without the addition of the fluidized screen. However, adding too much fluidized screen will increase the drag loss and reduce the thermoacoustic efficiency. When both ends When adding 3 layers of fluidized screen respectively, the least amount of heating is needed, and the thermoacoustic conversion efficiency is the highest.