Study of Multipiece, Flow-Through Wind Tunnel Models for HIRT

1975 ◽  
Author(s):  
W. K. Alexander ◽  
S. A. Griffin ◽  
A. E. Brady
Keyword(s):  
Wind Tunnel ◽  
Flow Through

Two-Dimensional Flow With Standing Vortexes in Ducts and Diffusers

1960 ◽  
Vol 82 (4) ◽  
pp. 921-927 ◽  
Author(s):  
Friedrich O. Ringleb
Keyword(s):  
Wind Tunnel ◽  
Potential Flow ◽  
Separation Control ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Princeton University ◽  
Two Dimensional Flow ◽  
Flow Through ◽  
Trapping Devices

The conditions for the equilibrium of two vortexes in a two-dimensional flow through a duct or diffuser are derived. Potential-flow considerations and a few basic results from viscous-flow theory are used for the discussion of the role of cusps as separation control and trapping devices for standing vortexes. The investigations are applied to cusp diffusers especially with regard to the wind tunnel of the James Forrestal Research Center of Princeton University.

scholarly journals Fabrication and Experimentation of Diffuser Augmented Wind Turbine

2019 ◽  
Vol 8 (2) ◽  
pp. 6047-6052
Keyword(s):  
Wind Tunnel ◽  
Wind Energy ◽  
Wind Turbine ◽  
Ansys Fluent ◽  
Throat Region ◽  
Pressure Transducers ◽  
Reference Velocity ◽  
Energy Facility ◽  
Horizontal Axis Wind Turbines ◽  
Flow Through

Wind Energy is turning into a big supply of renewable energy throughout the globe. This ever increasing field can probably reach the limit of accessibility and utility with the wind energy facility sites and size of the turbine itself. Therefore, it's needed to develop wind capturing devices that may produce energy within the locations wherever typical horizontal axis wind turbines (HAWTs) are too unrealistic to put in and operate. A diffuser augmented wind turbine (DAWT) is one such invention. DAWTs increase the ability output of the rotor by increasing the wind speed into the rotor employing a duct. The main objective of the project is to analyze the flow through the diffuser by placing it in wind tunnel and further the results are compared with the computational results. The purpose of investigating the flow through, the diffuser is to find out the behavior of wind flow at the throat region of the diffuser. Numerical analysis of diffuser is performed using the tool ANSYS FLUENT 15 and then by experimentation in wind tunnel. Experiments were carried out for investigating the flow pattern inside the circular profile diffuser of radius 60mm, Throat diameter of 200mm, inlet and outlet diameter of diffuser is 320mm. Pitot tubes are inserted on the rake and then mount on the throat region of diffuser for flow measurement in that region. Differential pressure transducers which gives voltage output are used for sensing the pressures from Pitot tubes, static tubes which is mount on surface of test section of tunnel and PS tube which is used for reference velocity. Further obtained pressure will be converted to velocity and get the required result. After completion of computational and experimental work comparable results were obtained.

Calculation of the Flow Properties Up- and Downstream of and Within a Supersonic Turbine Cascade

1972 ◽  
Author(s):  
O. K. Lawaczeck
Keyword(s):  
Supersonic Flow ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Theoretical Method ◽  
Experimental Results ◽  
Turbine Cascade ◽  
Flow Properties ◽  
Flow Through

This paper deals with the flow through cascades, which have a supersonic flow up- and downstream. A theoretical method is described to calculate, under certain conditions, the flow quantities up- and downstream of and within the cascade and to determine the pressure distribution on the blades. The method is compared with experimental results, carried out in the cascade wind tunnel of the Aero dynamische Versuchsanstalt Göttingen (AVA), Germany.

Effects of Periodic Holes on the Suppression of Aeroacoustic Noise From a Pantograph Horn

2003 ◽  
Author(s):  
Takehisa Takaishi ◽  
Mitsuru Ikeda ◽  
Chisachi Kato
Keyword(s):  
Wind Tunnel ◽  
Acoustic Resonance ◽  
Flow Fields ◽  
Low Noise ◽  
Aerodynamic Noise ◽  
Spanwise Direction ◽  
Large Structure ◽  
Unstable Flow ◽  
Aeroacoustic Noise ◽  
Flow Through

Three types of pantograph horn model; simple cylinder, a cylinder with periodic holes and a cylinder with a continuous slit, are tested in a low noise wind tunnel to compare their characteristics of aerodynamic noise and flow fields in the wake. Formation of strong vortices of alternate sign that have large structure in the spanwise direction is suppressed due to the flow through holes or the slit. The cylinder with the continuos slit is proved to reduce the noise sufficiently, but an unstable flow through the slit seems to produce distinct noise. Since formation of strong vortices is mainly suppressed due to momentum injection through holes or the slit, periodic holes have little effect on collapsing the spanwise structure of vortices, but they contribute to making the flow around the horn stable. The shape of holes should be optimized to avoid strong acoustic resonance.

A New Flow-Through Wind Tunnel Balance Concept for Retropropulsion Testing

2022 ◽  
Author(s):  
Devin E. Burns ◽  
Peter A. Parker ◽  
Christopher M. Cagle ◽  
Veronica M. Hawke ◽  
Kenneth Toro ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Balance ◽  
Flow Through

Wind-Tunnel Screens: Flow Instability and its Effect on Aerofoil Boundary Layers

1964 ◽  
Vol 68 (639) ◽  
pp. 198-198 ◽  
Author(s):  
P. Bradshaw
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Layer Thickness ◽  
Boundary Layers ◽  
Boundary Layer Thickness ◽  
Flow Instability ◽  
Flow Direction ◽  
Flat Plates ◽  
Mixing Processes ◽  
Flow Through

Morgan has described a spatial instability in the flow through screens or grids of small open-area ratio. Head and Rechenberg and others have observed large span-wise variations in the thickness and shear stress of nominally two-dimensional boundary layers on flat plates and aerofoils in wind tunnels. It now appears that these spanwise variations are caused by the instability of flow through the screens. The jets of air issuing from the pores of the screen attempt to entrain more air by the usual mixing processes, but can only entrain it from each other, so that groups of jets coalesce in rather random (steady) patterns determined by small irregularities in the weave. The resulting variations in axial velocity are virtually eliminated by the wind tunnel contraction, but variations in flow direction are not so greatly reduced: a theoretical analysis shows that the observed variations of boundary-layer thickness, which often reach ± 10 per cent of the mean, can be produced by directional variations in the working section of the order of ± 1/20 deg, with a spanwise wavelength of the same order as the boundary-layer thickness.

Wind-Tunnel Test of Flow Through Mars Pathfinder Lander

1997 ◽  
Vol 34 (3) ◽  
pp. 265-271 ◽  
Author(s):  
Thomas Rivell ◽  
Alvin Seiff ◽  
Srba Jovic ◽  
Gregory R. Wilson ◽  
Scott Maa ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Flow Through ◽  
Mars Pathfinder

Performance Predictions of Axial Turbines for Organic Rankine Cycle (ORC) Applications Based on Measurements of the Flow Through Two-Dimensional Cascades of Blades

2014 ◽  
Author(s):  
Karsten Hasselmann ◽  
Felix Reinker ◽  
Stefan aus der Wiesche ◽  
Eugeny Y. Kenig ◽  
Frithjof Dubberke ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Low Temperature ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Two Dimensional ◽  
Real Gas ◽  
Specific Loss ◽  
Performance Predictions ◽  
Flow Through ◽  
Organic Fluids

The Organic-Rankine-Cycle (ORC) offers a great potential for waste heat recovery and use of low-temperature sources for power generation. However, the ORC thermal efficiency is limited by the relatively low temperature level, and it is, therefore, of major importance to design ORC components with high efficiencies and minimized losses. The use of organic fluids creates new challenges for turbine design, due to real-gas behavior and low speed of sound. The design and performance predictions for steam and gas turbines have been mainly based on measurements and numerical simulations of flow through two-dimensional cascades of blades. In case of ORC turbines and related fluids, such an approach requires the use of specially designed closed cascade wind tunnels. In this contribution, the specific loss mechanisms caused by the organic fluids are reviewed. The concept and design of an ORC cascade wind tunnel are presented. This closed wind tunnel can operate at higher pressure and temperature levels, and this allows for an investigation of typical organic fluids and their real-gas behavior. The choice of suitable test fluids is discussed based on the specific loss mechanisms in ORC turbine cascades. In future work, we are going to exploit large-eddy-simulation (LES) techniques for calculating flow separation and losses. For the validation of this approach and benchmarking different sub-grid models, experimental data of blade cascade tests are crucial. The testing facility is part of a large research project aiming at obtaining loss correlations for performance predictions of ORC turbines and processes, and it is supported by the German Ministry for Education and Research (BMBF).

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