Pages 5-8
α-type Stirling Engines having a phase-angle of 90° and a stroke-volume ratio equal to 1 are analyzed by using T-S diagram. The results obtained are as follows : The optimum temperature ratio, which makes the diagram work to be maximum, is between 3 and 3.5 and it decreases as the dead volume ratio increases. Absorption of heat by the working gas occurs mostly while the crank angle of the power piston increases from 0 to 90°. The cycle approaches isothermal expansion and isothermal compression processes then the dead volume ratio becomes larger and the temperature ratio smaller. The optimum heat storage of the regenerator, which realizes the Carnot efficiency under given temperature conditions, changes by the temperature ratio and dead volume ratio.
