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A new generation of Wankel rotary engines that can offer multifuel capability, increased fuel economy, and improved performance and reliability could have a profound influence on the design of future power plants for aircraft, automotive and other applications. The recent advances in adiabatic diesel engine technology have potential to improve the Wankel rotary engine. In this paper, the potential benefits of adiabatic Wankel engine and advanced concepts like- advanced turbochargers, high compression ratio, faster combustion, and reduced leakage have been assessed. A Wankel simulation model was used to predict performance of the adiabatic Wankel engine with these advanced concepts- predicting an overall improvement of 25.5% in ISFC and 34.5% in power output. Also, excellent multifuel capability of adiabatic Wankel engine is expected.

Valve wear has been identified as a major durability problem in natural gas fueled reciprocating engines. Over the years, progress has been made to alleviate this problem through improved valve design and materials development. Recently high performance ceramics have shown promise for wear component applications. This paper presents the results of a valve train component materials investigation supported by the Gas Research institute. Testing tools and methods are described. The testing program culminated in a 300 hour component test in a full size turbocharged natural gas engine. Results of the engine test appeared to confirm preceding laboratory tests. Sintered silicon nitride valve seat inserts and Stellite 6 coated 21-12 stainless steel valves appeared to be the most promising material combination evaluated.