Projeto e construção de um motor Stirling do tipo gama com elementos mecânicos mutáveis

Abstract

The Stirling engine consists in thermal machine that performs work from the contraction and expansion of a gas, which alternates on a thermal gradient. The heat flux is controlled by volumetric changes. Flexibility is the main attraction of the engines Stirling. Since these motors work with the heat from an external source, any type of fuel can be used as a source of thermal energy. In this work it was developed the project and construction of a Stirling engine of the Gamma type configuration with mechanical components changeable (with possibility of geometric adjustments). The thermal dimensioning was performed according to the theory of Schmidt, studied by Koichi Hirata. In mechanical dimensioning it was proceeded as presented by Robert Norton, on projects of mechanical components. An experimental prototype built with a data acquisition system implemented is presented. The comparative study suggests that the work indicated has been approximately 26% less than the theoretical. The estimate of the experimental work is carried out by graphical integration. The deviation between of work estimated in relation to the numerical method was 0.5%, using the analytical equation of Hirata; this confirm the statement made by William Martini, in his publication at the design of Stirling engines.