Numerical study of distributor type diffuser performance for combustor

Due to the rapid increase of both inlet Ma number of the new generation aero-engine combustor and diffuser total pressure loss,a brand-new combustor diffuser-distributor type diffuser was designed.Based on theory of fluid dynamics,the total pressure loss of distributor type diffuser was calculated.The effects of distributor type diffuser outlet/inlet area ratio and inlet Ma number were analyzed.It indicates that numerical simulation results were consistent with the theory.When Ma was 0.36,the total pressure loss of distributor type diffuser was of 4.79%,which is less than total pressure loss of dump diffuser and it can meet with the requirement of high performance of new generation engine.The results can be used as guideline for optimization of distributor type diffuser to reduce the diffuser total pressure loss.