The combustion efficiency test was done on the single dome test piece of twin annular multi-point direct injection mixing(TAMDIM) high-temperature rise combustor

the idle combustion efficiency of two stages-fueled together mode and the pilot-fueled only mode with two different throat spacing sizes were compared

and the influence of different main and pilot equivalents (the pilot fuel ratio of 40%

56%

65%

100%) and throat spacing size on the combustion efficiency were analyzed. Test results show that

the throat spacing size has a great influence on the combustion efficiency when taking the two stages-fueled together mode

compared with the pilot-fueled only mode

better combustion efficiency has been obtained when the spacing of throat is 19.3 mm and the pilot fuel ratio is within the range of 40%~56%.Validated test has been done on the sector test piece finally

ulteriorly verifying the feasibility of fuel stage under idle condition in the TAMDIM high-temperature rise combustor.