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Complex Three-Dimensional Jet Flows: Computation and Experimental Validation

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Computation of Three-Dimensional Complex Flows

Part of the book series: Notes on Numerical Fluid Mechanics (NNFM) ((NONUFM,volume 49))

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Summary

Computational and experimental studies have been carried out on turbulent, round, normally impinging jets covering a range of nozzle heights and pressure ratios. Wall jet growth is seen to depend on both these parameters. Turbulence production in the wall jet is dominated by work done against shear stresses. Numerical modelling has been based on the k-e turbulence model and modifications to this. These all underpredict the growth of the wall jet to an extent and the predicted velocity profiles are seen to peak too close to the wall. A truly 3-D test case is proposed based on a jet impinging on a moving surface.

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Abbreviations

b:

Wall jet thickness (see Fig 1)

Dn :

Nozzle exit diameter (see Fig 1)

Hn :

Height of nozzle above ground (see Fig 1)

Hp :

Height of measuring probe above ground

k:

Turbulent kinetic energy

NPR:

Nozzle pressure ratio = p0/pa

p0 :

Nozzle stagnation pressure

pa :

Ambient static pressure

r:

Radial co-ordinate from nozzle centre-line (see Fig 1)

r1/2 :

Free jet thickness to half peak velocity

Tint :

Turbulence intensity at nozzle exit

U:

Free jet mean axial velocity

u:

Fluctuating velocity in the U-direction

V:

Mean velocity in the r-direction

y:

Co-ordinate perpendicular to ground

Y1/2 :

Wall jet thickness to half peak velocity (see Fig 1)

ε:

Rate of dissipation of turbulent kinetic energy

μ:

Laminar viscosity

π:

Production of turbulent kinetic energy

π1 :

Component of π due to normal stresses

π2 :

Component of π due to shear stresses

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Authors and Affiliations

  1. Aeromechanical Systems Group Royal Military College of Science, Cranfield University, Shrivenham, Swindon, Wiltshire, SN6 8LA, UK

    K. Knowles & M. Myszko

Authors
  1. K. Knowles
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  2. M. Myszko
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Editor information

Michel Deville Spyros Gavrilakis Inge L. Ryhming

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© 1996 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden

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Knowles, K., Myszko, M. (1996). Complex Three-Dimensional Jet Flows: Computation and Experimental Validation. In: Deville, M., Gavrilakis, S., Ryhming, I.L. (eds) Computation of Three-Dimensional Complex Flows. Notes on Numerical Fluid Mechanics (NNFM), vol 49. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-89838-8_17

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  • DOI: https://doi.org/10.1007/978-3-322-89838-8_17

  • Publisher Name: Vieweg+Teubner Verlag

  • Print ISBN: 978-3-322-89840-1

  • Online ISBN: 978-3-322-89838-8

  • eBook Packages: Springer Book Archive

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