Abstract
A thermoacoustic engine is one of promising system for utilization of unused energy. The object of this paper is to study the system of unused energy, such as heat energy and sound energy in noise using thermoacoustic engine. The thermoacoustic engine is composed of a stack sandwiched by two heat exchangers and tube. The stack has many narrow flow channels and its length for 50 mm. For example, in order to create narrow flow channels, the stack is comprised of wire-mesh screen. When the steep temperature gradient is made in the stack, a self-exited gas oscillation is generated. Thus, heat energy can be converted into sound energy. In this paper, thermoacoustic conversion device applied for noise energy generated from engine plants was presented. The noise has complicated frequency characteristics and low energy density. We demonstrated selective amplification of acoustic pressure only one-frequency in noise by utilization of the technique of thermoacoustic engine. In addition, the other frequencies were attenuated by viscosity dissipation in the stack. Summarizing these results, the simplification and amplified sound was created from complex noise.
Highlights
In order to realizing sustainable growth in a low-carbon society, utilization of unused energy is an important issue
The energy conversion techniques utilizing thermoacoustic phenomena, which are based on heat transport using compression and expansion of gas in many narrow flow channel called stack, is one of promising method, because of its availability for various energy sources, simple structure with non-moving parts and no harmful gas for refrigeration
The thermoacoustic energy conversion system have been propsed into two types: one is thermoacoustic engine [1-6], and other is thermoacoustic cooler
Summary
In order to realizing sustainable growth in a low-carbon society, utilization of unused energy is an important issue. The energy conversion techniques utilizing thermoacoustic phenomena, which are based on heat transport using compression and expansion of gas in many narrow flow channel called stack, is one of promising method, because of its availability for various energy sources, simple structure with non-moving parts and no harmful gas for refrigeration. Acoustic amplification by thermoacoustic effect was proposed by Ceperley [9], and it was realized by Biwa et al [10,11] These recent surge of research activity had brought significant findings. By using a thermoacoustic phenomenon in which acoustic waves are induced by providing a rapid temperature gradient (about 200 ° C. to about 500 ° C.) in a fine flow path, noise of low energy density can be selectively The final goal is to propose a system that amplifies and leads to effective utilization. Summarizing this result, the effect of thermoacoustic amplification was discussed in relation to the stack structure and resonance state
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