Addition of small amount of hydrogen as a means to improve performance of pistonless rotary engine firing lean air-fuel mixture
One of the capital drawbacks of Wankel engines is imperfect combustion of air-fuel mixture, which, however, may be prevented with adding free hydrogen to the main fuel. The authors cite the results of their experiments with hydrogenated fuel. Adding free hydrogen to the main fuel results in higher fuel efficiency and lower percentage of unburned hydrocarbons and carbon oxides in exhaust gas when firing lean fuel mixture. Thus, adding small (up to 5 %) doses of hydrogen to the main fuel secures stable Wankel engine operation at l = 1,3.