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首页> 美国政府科技报告 >Effect of a Transverse Acoustic Field on a Flush Shear Coaxial Injector
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Effect of a Transverse Acoustic Field on a Flush Shear Coaxial Injector

机译：横向声场对冲洗同轴注射器的影响

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An experimental study on the effects of an externally-imposed transverse acoustic field in a flush shear coaxial jet is presented. In this case the inner jet recess is zero and both the inner and outer jet exit planes coincide. Since recess is a design variable used when designing new injectors, this study complements previous studies from this group where the injector geometries included a recess. The shear coaxial injector used here is similar to those used in cryogenic liquid rockets. By using N2 as the working fluid, the chemistry effects are separated from the effects of a transverse acoustic field on coaxial jets. The acoustic field is generated by two piezo-sirens whose resonant frequency is approximately 3kHz. The acoustic pressures generated are about 2- 4% the value of the chamber pressure. The phase angle between these two sources is varied at 45 degree intervals. Two values of pressures are studied, 1.5 MPa (Pr=0.45) where the flow is subcritical and 3.6 MPa (Pr=1.05) where the pressure is near critical. The outer to inner jet velocity ratio varies from approximately 1.5 to 17 and the outer to inner jet momentum flux ratio (J) varies from approximately 0.09 to 20. These ratios are mainly varied by changing the temperature and flow rates of the outer jet. At least 3000 backlit images were taken at 20-25 kHz for each run. These images are the main analysis tool to study the jet behavior. The most dramatic effects resulting in about 90% reduction of the length of the inner jet core were obtained at near critical conditions for the cases of J=1.7 and 3.5.

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