To suppress an excessive increase in internal pressure of a circulation path by releasing exhaust gas in the circulation path to an exhaust gas storage tank when the internal pressure of the circulation path exceeds a predetermined pressure.
This gas circulation type engine is provided with: a combustion chamber CC supplied with an oxidizer, fuel to be oxidized with its burning promoted by the oxidizer, and a working medium having a higher ratio of specific heat than air and generating power in association with burning of the fuel to be oxidized; and the circulation path 20 connecting the intake side of the combustion chamber CC to the exhaust side thereof. The engine is so configured that the working medium is resupplied to the combustion chamber CC through the circulation path 20 without being discharged to the atmosphere. The engine includes: the exhaust gas storage tank 81 storing the exhaust gas from the combustion chamber CC, led to flow into from the circulation path 20; and a circulation path internal pressure regulation means disposed between the circulation path 20 and the exhaust gas storage tank 81, operated when the internal pressure of the circulation path 20 is higher than the predetermined pressure, and allowing exhaust gas in the circulation path 20 to flow into the exhaust gas storage tank 81 to thereby regulate the internal pressure of the circulation path 20.
SAWADA DAISAKU
KUROKI RENTARO
