Reducing the idle speed of a gasoline rotary engine with hydrogen addition.

This paper presented an experimental study about the idle performance of a rotary engine fueled with hydrogen and gasoline blends. The idle speed was reduced from original 2400 to 2300 and 2200 rpm, and hydrogen energy percentage ( β H2 ) was varied from 0% to 35.0%. Test results showed that cyclic variation was raised with the decrease of idle speed whereas reduced with the increase of β H2 . Both decreasing idle speed and increasing β H2 were effective on reducing engine fuel consumption. Total fuel energy flow rate was effectively dropped from 22.4 MJ/h under “2400 rpm and β H2 = 0%” to 20.01 MJ/h under “2200 rpm and β H2 = 35.0%”. Combustion duration was reduced through increasing β H2 . HC and CO emissions were dropped with the increase of β H2 , but increased after reducing idle speed. CO 2 emission was decreased after reducing idle speed and adding hydrogen. [ABSTRACT FROM AUTHOR]