Research progress of hydrogen-fueled and hydrogen-enriched wankel rotary engine
Hydrogen is the most promising clean energy in the 21st century.To meet more stringent emission regulations and achieve carbon peaking and neutrality, hydrogen-powered engines have gained keen academic interest in recent years.With a compact structure, high power-to-weight ratio, high-speed performance, low vibration and noise, rotary engines have a huge market potentials in UAVs, extended- range electric vehicles, and other fields.This paper reviews hydrogen powered Wankel rotary engine, aiming to seek the sustainable development of rotary engines.Existing research shows with the fast flame speed and short quenching distance, hydrogen improves the incomplete combustion caused by the narrow combustion chamber and the large surface-volume ratio of rotary engines, thus reducing fuel consumption and pollutant emissions.Since the intake, expansion and exhaust strokes are in different working chambers, and there is no intake/exhaust valve structure, the rotary engine is better at avoiding the auto- ignition and backfire caused by low hydrogen ignition energy, thus effectively improving the thermal efficiency and enhancing the working capacity of the engine.
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