Design of a swept wing wind tunnel model for study of cross-flow instability

2015 ◽  
Author(s):  
Jacopo Serpieri ◽  
Marios Kotsonis
Keyword(s):  
Wind Tunnel ◽  
Flow Instability ◽  
Cross Flow ◽  
Swept Wing ◽  
Wind Tunnel Model ◽  
Tunnel Model

Prediction of Stack Plume Downwash Using Computational Fluid Dynamics

2003 ◽  
Author(s):  
Stuart A. Cain ◽  
Lewis A. Maroti ◽  
Fangbiao Lin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Tunnel ◽  
Cross Flow ◽  
Leeward Side ◽  
Wind Tunnel Model ◽  
Ambient Wind ◽  
Model Study ◽  
Tunnel Model ◽  
Computational Fluid Dynamics Cfd

Accurate prediction of the fluid dynamic and thermodynamic characteristics of saturated buoyant plumes at power plant chimneys is important in developing reliable methods for controlling stack plume downwash. In particular, the accurate prediction and abatement of stack plume downwash is critical in northern climates where, under downwash conditions, the interaction of the saturated, warm plume with the cold outer chimney surface can lead to hazardous ice formation and buildup near the top of the chimney. When a stack is in downwash mode the plume leaving the stack turns downward and flows down along the leeward side of the shell. This is a direct consequence of the wind dynamic pressure acting on the plume and the low pressure in the wake of the shell. In downwash model it is not uncommon to see the plume travel down the shell one third to one half the chimney height and extend radially away from the shell a distance of twenty to thirty feet. This complex interaction of a turbulent thermally buoyant jet entering a cross wind has been studied extensively in the past both experimentally and theoretically with emphasis on the introduction of the jet through an orifice in an infinitely long flat plate. In the case of stack plume downwash the drag of the cylindrical stack in cross flow interacts with the plume under certain “worst-case” ambient wind conditions for the geographic location of the plant and draws the swirling plume into the wake region behind the stack. Once in this region, the distance the plume will travel down the leeward side of the chimney is a function of the ambient wind velocity and the plume velocity. Prediction of this complex, turbulent, three dimensional swirling flow including mixing of different temperature gases and the development of remedial devices to control, in particular, the problem of plume downwash has traditionally required an extensive and expensive wind tunnel model study. Results of these wind tunnel tests include empirical correlations and charts which have been used in the industry for decades. Advances in the capabilities of Computational Fluid Dynamics (CFD) have allowed engineers the ability to reliably study this flow phenomena in greater detail than attainable in a typical wind tunnel model study. In this paper Computational Fluid Dynamics (CFD) is used to predict downwash as a function of flue gas discharge velocity, wind velocity and temperature and the geometry of the stack near the discharge elevation. Further, two devices for minimizing plume downwash in a prototype stack installation are discussed and evaluated by the authors using CFD. Model validation simulations against experimental data and theoretical predictions of buoyant jets in cross flow are also presented and discussed.

scholarly journals Inter-Facility Correlations of Transonic Test Results of the AGARD-C Standard Wind-Tunnel Model

2018 ◽  
Vol 5 (13) ◽  
pp. 26476-26481
Author(s):  
Dijana Damljanović ◽  
Jovan Isaković ◽  
Marko Miloš
Keyword(s):  
Wind Tunnel ◽  
Test Results ◽  
Wind Tunnel Model ◽  
Tunnel Model

Evaluation of an I-box wind tunnel model for assessment of behavioral responses of blow flies

2013 ◽  
Vol 112 (11) ◽  
pp. 3789-3798 ◽  
Author(s):  
Kittikhun Moophayak ◽  
Kabkaew L. Sukontason ◽  
Hiromu Kurahashi ◽  
Roy C. Vogtsberger ◽  
Kom Sukontason
Keyword(s):  
Wind Tunnel ◽  
Behavioral Responses ◽  
Wind Tunnel Model ◽  
Blow Flies ◽  
Tunnel Model

scholarly journals Numerical Investigation of Wind-Tunnel Model Deformations Caused by the Twin-Sting Support System

2010 ◽  
Vol 47 (2) ◽  
pp. 708-714 ◽  
Author(s):  
Roberto Flores ◽  
Enrique Ortega ◽  
Eugenio Oñate
Keyword(s):  
Wind Tunnel ◽  
Numerical Investigation ◽  
Support System ◽  
Wind Tunnel Model ◽  
Tunnel Model

Aerodynamics of a Fixed Ground Plane for a Powered STOL Wind-Tunnel Model

1973 ◽  
Vol 10 (3) ◽  
pp. 137-142
Author(s):  
J. E. Hackett ◽  
J. L. Justice
Keyword(s):  
Wind Tunnel ◽  
Ground Plane ◽  
Wind Tunnel Model ◽  
Tunnel Model
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