In order to illustrate the effects of hydrogen addition on the combustion characteristics of RP3 kerosene

the laminar burning velocity and Markstein length of RP3 kerosene/hydrogen mixture were investigated experimentally in a constant volume combustion bomb. The experiments were performed at initial pressure of 0.1MPa

initial temperatures of 390

420K and over the equivalence ratios range of 0.8-1.5. The influences of hydrogen addition ratio on the flame structure

laminar burning velocity and Markstein length were investigated. Results showed that some cracks or folds appeared on the flame front in the flame developing process

and the instability of flame increased with the growing hydrogen addition ratio. Increasing the equivalence ratio or the hydrogen addition ratio decreased the Markstein length of RP3 kerosene/hydrogen mixture. Furthermore

with the equivalence ratio increasing from 0.8 to 1.5

the laminar burning velocity of RP-3 kerosene/hydrogen mixture increased initially and then decreased gradually. The highest laminar burning velocity was measured at fuel rich condition (the equivalence ratio was 1.2). At the same time

with the increase of initial temperature or hydrogen addition ratio

the laminar burning velocity of RP-3 kerosene/hydrogen mixture showed an increasing trend.