The laminar combustion characteristics of dimethyl ether-hydrogen-air mixture were studied at various equivalence ratios

hydrogen fractions and initial pressures by using a constant volume combustion bomb. The influences of the equivalence ratio

the hydrogen fraction and the initial pressure on flame speed and combustion characteristics were analyzed. The results show that the flame speed

the laminar burning velocity and the mass burning rate increase with the increase of the hydrogen fraction. Increasing the hydrogen fraction will increase the peak combustion pressure and shorten the combustion duration. For small hydrogen fractions

the Markstein length decreases with the increase of the equivalence ratio

indicating that the lean mixture has higher flame front stability than the rich mixture. For large hydrogen fractions

the Markstein length increases with the increase of the equivalence ratio

indicating that the rich mixture has higher flame front stability than the lean mixture. Maximum combustion pressure increases with the increase of initial pressure

and initial pressure displays greater influence on combustion pressure than doping hydrogen.