Due to the limitation of the limited propellant carried by spacecraft,the hydrogen-oxygen internal combustion engine(HO ICE)for aerospace is suitable for pure hydrogen,pure oxygen and hydrogen-rich combustion,but lack of ground test validation.In order to realize the high-performance and reliable engines,it is particularly important to study the combustion charac-teristics of HO ICE.It adopts the methods of oxygen-enhanced and constant volume combustion to obtain HO ICE laminar combustion characteristics.The experiment result indicate:as the con-centration of oxygen increases,laminar burning speed increases exponentially with equivalent ratio,but the increasing scale of burning speed will gradually decrease with equivalent ratio.Under the condition of high oxygen concentration,laminar burning speed is maintained at a very high level,and changes little with equivalent ratio.
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