Erratum: ‘‘Two-dimensional focusing of a supersonic free jet by a rectangular orifice’’ [Phys. Fluids 30, 1899 (1987)]

1987 ◽  
Vol 30 (12) ◽  
pp. 3847
Author(s):  
Koji Teshima
Keyword(s):  
Two Dimensional ◽  
Free Jet

Comparing selected parameters of a two-dimensional turbulent free jet on the basis of experimental results, digital simulations, and theoretical analyses

2016 ◽  
Vol 1 (20) ◽  
pp. 31-48
Author(s):  
Aldona Skotnicka-Siepsiak
Keyword(s):  
Linear Function ◽  
Analytical Methods ◽  
Relative Length ◽  
Wall Layer ◽  
Turbulence Level ◽  
Two Dimensional ◽  
Free Jet ◽  
Theoretical Assumptions ◽  
Digital Simulations ◽  
Theoretical Analyses

The presented experimental and digital examinations of a two-dimensional turbulent free jet are a first phase of in the study of the Coandă effect and its hysteresis. Additionally, basing on theoretical analyses, selected results for a turbulent jest have been also mentioned, considering theoretical assumptions for the wall layer. As the result, on the basis of experimental, digital, and analytical methods, a review of characteristic jet properties has been prepared, which includes a jet spreading ratio, its cross and longitudinal sections, and turbulence level. The jet spreading radio has been expressed as a non-linear function of the x : b relative length.

On Wall Effects in Cavity Flows

1984 ◽  
Vol 28 (01) ◽  
pp. 70-75
Author(s):  
C. C. Hsu
Keyword(s):  
Numerical Results ◽  
Cavity Flows ◽  
Two Dimensional ◽  
Wall Effects ◽  
Free Jet ◽  
Theoretical Predictions ◽  
Experimental Findings ◽  
Good Agreement

Simple wall correction rules for two-dimensional and nearly two-dimensional cavity flows in closed or free jet water tunnels, based on existing linearized analyses, are made. Numerical results calculated from these expressions are compared with existing experimental findings. The present theoretical predictions are, in general, in good agreement with data.

scholarly journals A Note on the Unsteady Cavity Flow in a Tunnel

1974 ◽  
Vol 96 (1) ◽  
pp. 25-28
Author(s):  
J. H. Kim ◽  
A. J. Acosta
Keyword(s):  
Slug Flow ◽  
Strong Dependence ◽  
Complex Form ◽  
Cavity Flow ◽  
Inertial Oscillation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Free Jet ◽  
The One ◽  
Limiting Case

The unsteady internal cavitating flow such as the one observed in a pump or a turbine is studied for a simple two-dimensional model of a base-cavitating wedge in an infinite tunnel and it is shown how the cavitation compliance can be calculated using the linearized free streamline theory. Numerical values are obtained for the limiting case of a free jet. Two important features are: First, the cavitation compliance is found to be of complex form, having additional resistive and reactive terms beyond the purely inertial oscillation of the whole channel in “slug flow.” Second, the compliance has a strong dependence on frequency.

The aerodynamic forces on an oscillating aerofoil in a free jet

1955 ◽  
Vol 229 (1177) ◽  
pp. 235-250 ◽  
Keyword(s):  
Wind Tunnel ◽  
Incompressible Fluid ◽  
Classical Theory ◽  
Direct Application ◽  
Two Dimensional ◽  
Aerodynamic Forces ◽  
Small Oscillations ◽  
Free Jet ◽  
Inviscid Incompressible Fluid ◽  
Wind Tunnel Measurements

The forces acting on an aerofoil placed centrally in a two-dimensional jet of inviscid incompressible fluid are calculated exactly for the case when the aerofoil is performing small oscillations about its mean position. The theory is a generalization of the classical theory due to Theodorsen and others for an oscillating aerofoil in an infinite stream. The results, which are expressed in terms of a ‘generalized Theodorsen function’, have a direct application to the correction of open-jet wind-tunnel measurements on oscillating aerofoils.

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