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Flow tracing techniques for the study of mixing dispersion and entrainment in axisymmmetric free jets

Ransom E.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1999

nr 9

115-120

Flow tracing methods traditionally have been used for the qualitative evaluation of aerodynamic flows. This paper describes a technique which has been used successfully to investigate quantitatively the entrainment characteristics of a free jet by monitoring the decay rate of a gas injected into the flow. The selection of an appropriate tracer gas with reference to its effect on the thermodynamic properties of air is discussed. The mode of operation of the sampling and detection method, a quadrupole mass spectrometer, is described. Analysis of the samples drawn from the flow field provides tracer gas concentration profiles throughout the flow and these enable entrainment rates along the jet plume length to be determined. An example is given of the application of the method which indicates how the magnitude of the induced pressure field is related directly to jet mixing rates.