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Effect of Rotating Direction on Flow and Temperature Field of Concentric Staged Combustor

The characteristic of cold/reaction flow and temperature field were investigated by using the numerical simulation for concentric staged multi-point direct injection combustor. The interaction mechanism between the flow field and the temperature field was revealed, and the effect rules of the swirlers rotating direction on the flow and temperature field were obtained. The results indicated that the central recirculation zone with divergence angle of 17 degrees is formed under cold condition by using the co-rotating swirlers and counter-rotating swirlers, and the central recirculation zone size of co-rotating swirlers is larger than that of counter-rotating swirlers. Heat release of the flame causes the similar central recirculation zone shape is formed by using the different rotating direction swirlers, and the divergence angle increased to 45 degrees. Tangential velocity contour of different aixal sections are undergone the "circular shape", "diamond shape", "elliptical shape" and "upper-lower symmetrical" structures, which represent the formation of the central recirculation zone, initial development, full development and gradual disappearance respectively. With the decreasing of tangential velocity of the swirling air in the combustor, the axial velocity at center of near outlet and the hot spot temperature at the outlet of combustor increase. Therefore, the co-rotating swirlers combustor has a better outlet temperature distribution factor (OTDF).