Numerical study of mixing characteristics of triplet impingement injectors
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1.
College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Received Date:
2010-06-08
Accepted Date:
2010-07-05
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Abstract
In order to enhance mixing effect,two novel styles of triplet impingement injectors were presented by changing middle jet orifice or the other two jet orifices into cone-shaped orifices.Flow field characteristics of above-mentioned two kinds of injectors and traditional injectors with triple straight-wall jet orifices under conditions of fuel-oxidizer-fuel triplet arrangement were analyzed based on 3-D computational fluid dynamic methods.The numerical simulation results demonstrate that mixing of triplet impingement injectors is principally accelerated by transverse vortices.For the injector with cone-shaped oxidizer jet orifice,the vertex intensity of flow field is lower than that of the injector with triple straight-wall jet orifices.For the injector with cone-shaped fuel jet orifices,there is a definite increase of the vertex intensity of flow field.Mass-weighted average unmixedness was introduced to evaluate the mixing performances of three kinds of injectors.It is indicated that the mixing effect of injector with cone-shaped fuel jet orifices is better than that of injector with triple straight-wall jet orifices and the injector with cone-shaped oxidizer jet orifice is the worst of three.For injector design of chemical laser combustors,oxidizer and fuel jet orifices adopt different styles,for example,the injector with cone-shaped fuel jet orifices,which helps improve mixing effect of oxidizer flow and fuel flow further.
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