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1 2004

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Flow in a new type externally heated air engine with two blowers

Brzeski L., Kazimierski Z., Wojewoda J.

Mechanics and Mechanical Engineering

2004

Vol. 7, nr 2

193-202

The experimental investigation of the 2-stroke Externally Heated Valve Engine (EHVE), different from the known Stirling engine, were carried out during 1999-2000. The main disadvantages of the engine were well known. The following changes are proposed in the improved version of the engine, in the case when natural fuels are exhausted (gas and oil): 1. in order to enlarge heat transfer in this air engine heater and cooler (a little mass flow rate is employed in each piston engine), a working air circulation forced by two blowers, one in a large volume (arbitrary) heater and the second in a similar volume cooler, are applied; 2. a 4-stroke engine cycle has been introduced; 3. self-acting valves are eliminated and only two governed are used instead. Numerical solutions in the form of time-dependent pressure and temperature diagrams for each volume of the engine (i.e. for a cylinder, a heater and a cooler) and mass flow rates through valves, as well as p - V diagrams will be presented. Finally, the essential results, i.e. the power and efficiency, are given.