Stirling engine is an external combustion engine that creates work by utilizing a temperature gradient within a cylinder to drive a piston. These engines are attractive options for green technologies because the temperature differences can be produced by a variety of heat sources. A special type of gas engine with external combustion is called a Stirling engine. The mechanism has two pistons with two volumes inside. The pistons are connected together through cooler, regenerator and warmer. The engine effectivity depends on the piston movement behaviour. The usual sinusoidal time curve leads to low effectiveness. The quick movement from lower to an upper position with a certain delay in both top and bottom dead centres is more effective. The paper deals with three types of mechanisms, analysing the piston movement, and their behaviour. Special emphasize is taken to the piston movement regime.
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