In order to balance the low emission and wide stabilization for lean premixed prevaporized combustion, the centrally staged layout is preferred in advanced aero-engine combustors. However, it is more difficult for the centrally staged combustor to light up as the main stage air layer will prevent the pilot fuel droplets arriving at igniter tip. The goal of the present paper is to study the effect of the main stage air on the ignition of the centrally staged combustor. Two cases of the main swirler vane angle of the TeLESS-II combustor, 20 degree and 30 degree are researched. The ignition results at room temperature and pressure show that the ignition performance of the 30 degree vane angle case is better than that of the 20 degree vane angle case. High speed camera, PLIF and CFD are used to better understand the ignition results. The high-speed camera has recorded the ignition process indicating that the initial kernel propagates along the radial direction to the combustor center. The CFD results show that the concentration of kerosene vapor of the 30 degree vane angle case is much larger than that of the 20 degree vane angle case close to the igniter tip and along the propagation route of the kernel, therefore, the 30 degree vane angle case has a better ignition performance. For the consideration of the ignition performance, a larger main swirler vane angle of 30 degree is suggested for the better fuel distribution when designing a centrally staged combustor.
Influence of Main Swirler Vane Angle on the Ignition Performance of TeLESS-II Combustor
2016
Aufsatz (Zeitschrift)
Englisch
Influence of Main Swirler Vane Angle on the Ignition Performance of TeLESS-II Combustor
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