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For a disaster relief and automatic inspections, an unmanned helicopter is strongly expected. To develop this, a very high power density source is required. A Wankel-type rotary engine can be the best candidate for the power source. In this study, the development of a very small rotary engine with a displacement of 30 cc is targeted. In order to improve the combustion efficiency, gas exchange and stable ignition, a multi dimensional simulation inside the combustion chamber was carried out. At first, the effect of volumetric efficiency on the maximum power is mentioned. Secondly, the effect of scavenging efficiency is discussed. Thirdly, a blow off through a plug hole is described. The position of plug hole was found important to reduce the blow off amount. Finally, the effect of combustion speed on the engine performance is predicted. As a result, the proposed design will be tested using a proto-type engine.

A new energy extraction and utilization system for low grade solid fuels such as coal and wastes is proposed, where solid fuels are gasified with high temperature air. The syngas is first cooled in a waste heat recovery boiler to extract its sensible thermal energy followed by conventional low temperature gas cleaning. A part of this cleaned-up syngas is used for high temperature air preheating while the rest is used for various energy utilization and conversion systems such as industrial furnaces, boilers and gas turbines. Experimental demonstration results for two main components, i.e. a gasifier and a high temperature air preheater are reported.