In order to investigate the effects of inlet temperature on the combustion instability in stratified swirl combustor

the dynamic pressure under various inlet temperatures was tested using a single doom combustor

and the effects of inlet temperature on pressure oscillation were analyzed using a theory. The experimental results showed that the mode of combustion instability in this combustor was Helmholtz mode. With the increase of inlet temperature from 530K to 650K

the amplitude of pressure oscillation decreased. Analysis showed that the increase of inlet temperature can enhance fuel atomization and evaporation and then strengthen its mixing with air

making equivalence-ratio oscillation less impossible. Therefore combustion instability was less prone to occur and the dynamic pressure amplitude was smaller.