Effect of Taper Angle around Regenerator on Thermal Efficiency of A Traveling Wave Thermoacoustic Engine

DOI Web Site
  • SENGA Mariko
    Course of Mechanical Engineering, Graduate School of Engineering, Tokai University
  • KASE Ryuju
    Course of Mechanical Engineering, Graduate School of Engineering, Tokai University
  • HASEGAWA Shinya
    Department of Prime Mover Engineering, School of Engineering, Tokai University

Bibliographic Information

Other Title
  • 蓄熱器前後のテーパ角度が進行波型熱音響機関の熱効率に及ぼす影響
  • チクネツキ ゼンゴ ノ テーパ カクド ガ シンコウハガタ ネツ オンキョウ キカン ノ ネツ コウリツ ニ オヨボス エイキョウ

Search this article

Description

The relationship between the thermal efficiency and specific acoustic impedance z in a regenerator was calculated by Ceperley in 1985. His calculation results showed that regenerator thermal efficiency is limited to around 10% of the Carnot efficiency when z of the regenerator is equivalent to the characteristic acoustic impedance of a traveling wave in free space. Furthermore, he also showed that if z can become 10 times of the characteristic acoustic impedance of a traveling wave, the thermal efficiency reaches 79% of the Carnot efficiency. In order to achieve high acoustic impedance, he explained the crosssectional area of the enlarged tube should be larger than that of the upstream duct. On the other hand, losses caused by sudden expansions in regenerator was found. These kinds of losses could be reduced by installing tapered tubes between regenerator and upstream/downstream ducts. In this study, we changed the angle of the tapered tube and measured thermal efficiency and acoustic power gain at regenerator positions of a traveling wave thermoacoustic engine. From the results, maximum thermal efficiency achieved 50.6 % of Carnot efficiency when taper angle was 7 degree.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top