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On regularities of submerged jet flows

Journal: Reporter of the Priazovskyi State Technical University. Section: Technical sciences (Vol.30, No. 1)

Publication Date:

Authors : ;

Page : 202-212

Keywords : nozzle; jet; flow; speed; ejection; additional mass;

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The calculation technique of free jet flows parameters in quasi one-dimensional formulation ? the most suitable for the solution of applied engineering problems has been submitted. The advantage of this technique is its- universality and possibility to use it for definition of both laminar and turbulent parameters definition (initial turbulence degree being different), subsonic and supersonic jet flows through nozzles of various configuration. The basic regularities and dependences of speed longitudinal attenuation of speed on additional mass and the shift layer thickness increase for axial-symmetric and flat jets assuming that: parameters in isobaric section are distributed uniformly; the transverse components of speed in the jet are neglected; the speed structure (profile) in the jet section obeys the Schlichtings ratio; the pressure in the jet behind the isobaric section in the supersonic jet is equal to the pressure in the surrounding medium. For jet streams the value of additional mass is important, as it is responsible for portable properties of jets and is the parameter that takes indirect account of turbulent viscosity. Practically complete agreement between the received relations for axial-symmetric and flat jets has been supported with experiments, including for supersonic off-design jets. The given procedure makes it possible to extend the theory of turbulent jets

Last modified: 2015-11-26 21:50:22