Abstract
This paper describes the performance of a trapped-vortex combustor (TVC) which is a novel and compact gas turbine combustor with two cavities and a main zone. A 180mm wide rectangular TVC test rig, including diffuser, combustor case and liner, was designed and fabricated. Experiments were conducted to obtain the flow drag characteristics, ignition and lean blow out(LBO) performance and the combustion efficiency etc. at different inlet air flow rates(0.45kg/s~0.65kg/s), inlet temperatures (300K~500K) and overall fuel/air ratio with fixed inlet air pressure(about 0.108MPa). The total pressure loss increases from 3.05% to 5.19% with increasing the inlet air flow rates and inlet temperatures, however the flow drag coefficient varies little (about 24~25). Ignition limits and LBO limits are not so strongly dependent on the inlet air flow rates, but improve greatly when inlet temperature increases from 300K to 500K. Minimum overall fuel air ratio of ignition and LBO is 0.0055 and 0.0023 respectively. The combustion efficiency about 90%~95% was achieved at different overall fuel air ratio When only cavity was fueled. And it varies from 84% to 99.5% with overall fuel air ratio increasing from 0.0016 to 0.0037 when the primary fuel air ratio is fixed at 0.042 and the cavity and main zone were fueled together.
Published Version
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