Experimental Study on the Influence of Oil-gas Ratio Change on Flow Field of Combustion Chamber
In order to solve the problem of combustion stability of aero-engine when the oil-gas ratio changes,the short annular combustion chamber of a certain aero-engine under different oil-gas ratios were studied experimentally.The PIV velocimeter was used to measure the liquid mist combustion flow field in the combustion chamber under different oil-gas ratios;temperature sensors were used to measure the tem-perature distribution at the combustion chamber outlet,and the influence of the oil-gas ratio on the com-bustion flow field and outlet temperature distribution in the combustion chamber was analyzed.The results show that with the increase of oil-gas ratio,the length of the reflux zone of the combustion chamber is shortened,the vortex center of the reflux zone is closer to the upper and lower walls of the flame tube,and the vortex center distance increases;the turbulence degree of airflow in the combustion chamber in-creases,and the velocity axial component Urms increases;the temperature T at each point of the combus-tion chamber outlet increases accordingly.When the oil-gas ratio is close to the flame-out boundary,the stability of the combustion flow field weakens.
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