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As a power source for local electric supply in developing countries, Stirling engine has received keen interest due to its high thermal efficiency as well as its fuel diversity. In this study, a tubular flame burner has been developed for heating the head of a Stirling engine due to its advantage in shape. To enhance the thermal efficiency of electric power generation, a larger diameter burner with burned gas recirculation has been developed. Results show that stable combustion can be obtained for wider ranges in equivalence ratio and in heat input as compared with those of the previous burner. With a decrease of equivalence ratio, the head temperature, electric power generation and thermal efficiency are increased for a constant heat input, and a maximum thermal efficiency of 11.2 % has been attained.
