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Study of the reduction of the onset temperature in a loop-tube-type thermoacoustic prime mover using conical phase adjuster.—Based study on the installation position and onset temperature of conical phase adjuster

In this report, we proposed the installation of a conical phase adjuster (CPA) in a thermoacoustic prime mover as a method for reducing the onset temperature and investigated the effect of the installation position of a CPA on the onset temperature using stability analysis. The onset temperature of CPA also was investigated experimentally by changing the installation position of CPA. As a result, when CPA was installed at 1000 mm from the high-temperature end of the stack, the onset temperature was 195 K lower than the onset temperature without CPA, that is, the installation of the CPA in a loop-tube-type thermoacoustic prime mover reduced the onset temperature by 29%. Comparing onset temperatures of the PA had installed in a system, CPA is considered to have the same effect as a PA because the onset temperature tendency of the CPA to reduce at the installation position agrees with that of the PA.