On the deformation of the rectangular turbulent jet cross-section

Abstract

The paper explains the reason for the experimentally observable deformation of a rectangular turbulent jet manifesting itself in a rapid growth (along the jet length) of the jet cross-section short side and a reduction of its long side. As a result, these sides change places some distance downstream of the jet origin. The jet deformation is shown to be due to a specific pressure field induced by large vortices that originate in the jet mixing zone. A method of calculating the jet deformation is developed which makes use of the author's information on the pressure field produced by large vortices. The predicted results are compared with the experimental data available from other sources. The theory suggested applies to jet flows in boiler furnaces, dryers, combustion chambers of jet engines and stationary gas-turbine plants of electric power stations, chemical reactors, etc.