Influence of Stack Porosity on Performance and Adsorption Incidental in Close-Open Thermoacoustic Engine.

A close-open thermoacoustic engine was designed, constructed, and tested by using air as working gas. The stack was made of a pile stainless 316 wire mesh with length of 30 mm. In this study, performance and absorption incidental sound energy were investigated by changing the stack porosity. Experimental results show that stack porosity was significantly influence onset temperature, pressure amplitude and acoustic intensity due to viscous losses. The engine achieved a steady working frequency of 87 Hz. Maximum acoustic intensity that can be achieved is 1387 W/m2. Absorption sound power decreases when the hydraulic radius is reduced to the same value as thermal penetration depth. It increases when the thermal penetration depth is greater than hydraulic radius. [ABSTRACT FROM AUTHOR]