Liner dome shape effect on the annulus flow characteristics with and without swirl for a can-combustor model

Abstract

The annulus flow characteristics of a can-combustor model for different liner dome shapes have been experimentally established under isothermal flow conditions for both nonswirling and swirling flows. Pressure taps were used to measure the wall pressure along the air casing and liner, whereas, velocity and pressure profiles were measured with the help of a threehole pressure probe in null mode. Turbulence intensity has also been measured with a constant temperature hot-wire anemometer. The effects of dome shapes on the recirculation zone, as well as on flow uniformity in the annulus region, for fixed dump gap, have been specially looked into. It was observed that the liner dome shape affects the size of recirculation zone and flow uniformity in the annulus region. The performance of the system was also assessed in terms of total pressure loss and static pressure recovery between the first and last measurement stations. It was found that swirling flow with a hemispherical dome liner gives better flow characteristics in the annulus region when compared with the other two dome shapes (namely, ellipsoidal, and vertical ellipsoidal).