Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : December 03, 2022
Fifty heat flux sensors made of nickel foil are mounted on the walls of the expansion space of a Stirling engine. Only one of the heat flux sensors is heated by CTA. In this measurement, the rotational speed and the width of an annular slit through which the working gas enter the expansion space are changed. For slit widths 0.65mm or wider, the heat flux is small and changed little with phase. When the slit is narrow and the rotational speed is high, there is a significant enhancement of heat transfer in the phases between the transfer process from the compression space and the expansion process. The averaged heat flux for phases between 120° and 180° (the phase origin corresponds to the top dead center of the displacer) and for all sensors simply shows that the heat flux increases rapidly with increasing rotational speed. Comparing the experimental and theoretical heat flux values during the expansion process, the engine working at atmospheric pressure on average and 8Hz can generally transfer the required heat.
