Comparison of hot and cold subsonic jets in an external flow with reference to jet engine simulation

Report (1980)

Authors

W.B. de Wolf

B. Munniksma

Flight simulation Jet flow Wind tunnel tests Hot jets Exhaust flow simulation Subsonic flow Conical nozzles Jet boundaries Jet entrainment Jet mixing

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Published Date

16-05-1980

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NLR-TR 80042 U

Abstract

An experimental investigation was carried out concerning the effect of jet heating and external flow on the mean flow properties of a subsonic jet. A 60 mm diameter jet was tested in a wind tunnel at wind speeds of 0 and 60 m/s. Jet mach numbers varied between O.44 and 0.94 and jet total temperatures were 310 and 86O K. Velocity and temperature profiles in the jet were determined for op to 20 nozzle diameters downstream. Jet Reynolds numbers based on nozzle diameter were larger than 4 x 10/5 which is considered high enough to obtain results which are independent of Reynolds number. Semi-empirical relations were obtained for the center line velocity decay, the location of the jet boundary and the direction of the streamlines at the jet boundary. From these relations the shortcomings of simulation of a hot engine exhaust jet by a cold air jet in wind tunnel experiments can be estimated.

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