| SHEN Chen， WANG Hui， YANG Shuai， YANG Tong， WANG Yang.Experimental Investigation on Two-dimensional Turbulence Characteristics of Cold Flow Fieldin a Dual-stage Swirl Combustor[J].航空发动机,2024,50(3):47-52 |
| Experimental Investigation on Two-dimensional Turbulence Characteristics of Cold Flow Fieldin a Dual-stage Swirl Combustor |
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| Key Words:particle image velocity dual-stage swirler flow field of combustor velocity fields Reynolds stress turbulence
intensity aeroengine |
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| Abstract:In order to investigate the turbulent structure of the combustor flow field， a particle image velocity （PIV） system was
employed to measure the flow field characteristics of a dual-stage swirler combustor. The velocity field distribution， Reynolds stress
distribution， and turbulence intensity distribution at different inlet velocities were obtained. The results show that with the increase of the
inlet velocity， the jet velocity at the outlet of the swirler increases， and the axial velocity in the central recirculation zone changes slightly.
There are five high Reynolds stress regions on the 2D plane of the axial measurement section of the combustor， which are the one central
recirculation zone， the two intersection zone between the recirculation zone and the high-speed swirling jet （shear layer）， and the two
contact zone between the high speed swirling jet and the simulated wall of the combustor head. The high Reynolds stress distribution in the
intersection zone between the recirculation zone and the high-speed swirling jet is conducive to the full mixing of fuel and air. Turbulence
intensity distribution is related to velocity fluctuation amplitude and average velocity. Turbulence intensity is higher at the intersection zone
between the central recirculation zone and the high-speed swirling jet. |
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