Abstract
The characteristics of hydrogen internal combustion Stirling engine were analyzed by comparing the engine performances on steam injection and H2-O2 injection. The experiment results on the steam injection showed that the internal conversion efficiency and pressure ratio increased to comparable levels with H2-O2 injection. Simulations and estimations on the engine characteristics suggested that the performance improvement in the hydrogen internal combustion Stirling engine was caused by not only the temperature increase in the expansion space but also a large amount of condensation of steam and the evaporation at the regenerator.
