スターリング機関実験機における非定常伝熱特性

概要

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Measuring method of heat transfer in coolers and heaters of Stirling engine, where working gas flow is substantially in unsteady state, was devised and applied to the Stirling engine made for basic experiments. This method is based on measuring enthalpy variation between inlet and outlet of a cooler or a heater with high response resistance thermometers. A set of six thermometers of thin tungsten wires (5μm in diameter and about 15 mm in length) was prepared and installed in the Stirling engine where helium or nitrogen gas was used as working gas. Heat transfer coefficients between heat transfer surfaces of a heater/a cooler and working gas were measured. The obtained heat transfer coefficients show rather smaller values at small <I>Re</I> number range compared with the calculated values by using equations for steady flow by Hausen, et al. The obtained cyclic variation curve of working gas temperature within the expansion cylinder is not similar to the sinusoidal curve that has been presented by various computer simulation studies, but is similar to a saw tooth curve.
社団法人日本マリンエンジニアリング学会の論文