New Hybrid Method to Correct for Wind Tunnel Wall- and Support Interference On-line
Because support interference corrections are not properly
understood, engineers mostly rely on expensive dummy measurements
or CFD calculations. This paper presents a method based on uncorrected wind tunnel measurements and fast calculation techniques
(it is a hybrid method) to calculate wall interference, support interference and residual interference (when e.g. a support member
closely approaches the wind tunnel walls) for any type of wind tunnel and support configuration. The method provides with a simple formula
for the calculation of the interference gradient. This gradient is
based on the uncorrected measurements and a successive calculation
of the slopes of the interference-free aerodynamic coefficients. For the latter purpose a new vortex-lattice routine is developed that corrects
the slopes for viscous effects. A test case of a measurement on a wing proves the value of this hybrid method as trends and orders of
magnitudes of the interference are correctly determined.
[1] B.F.R. Ewald, AGARDograph 336: Wind Tunnel Wall Correction. Canada Communication Group Inc., 1998.
[2] B.J.C. Horsten and L.L.M. Veldhuis, Experimental and Numerical Results
on Cavity Effects in Juncture Flow. Conference Proceeding of the 38th Fluid Dynamics Conference and Exhibit, Seattle, Washington, United
States, 2008.
[3] D. Eckert, Correction of Support Influence on Measurements with Sting
Mounted Wind Tunnel Models. AGARD FDP Conference, Brussels,
Belgium, 1993.
[4] X. Vaucheret, Vortex Lattice Code For Computation of Any Wind Tunnel and Support Effects on Models. La Recherche Aerospatiale, vol. 1(2),
pp. 39-51, 1991.
[5] M. Mokry, Evaluation of Combined Wall- and Support-Interference on
Wind Tunnel Models. AGARD-CP-535, 1994.
[6] K. Pettersson and A. Rizzi, Aerodynamic scaling to free flight conditions: Past and present. Progress in Aerospace Sciences vol. 44(4), pp. 295-313, 2008.
[1] B.F.R. Ewald, AGARDograph 336: Wind Tunnel Wall Correction. Canada Communication Group Inc., 1998.
[2] B.J.C. Horsten and L.L.M. Veldhuis, Experimental and Numerical Results
on Cavity Effects in Juncture Flow. Conference Proceeding of the 38th Fluid Dynamics Conference and Exhibit, Seattle, Washington, United
States, 2008.
[3] D. Eckert, Correction of Support Influence on Measurements with Sting
Mounted Wind Tunnel Models. AGARD FDP Conference, Brussels,
Belgium, 1993.
[4] X. Vaucheret, Vortex Lattice Code For Computation of Any Wind Tunnel and Support Effects on Models. La Recherche Aerospatiale, vol. 1(2),
pp. 39-51, 1991.
[5] M. Mokry, Evaluation of Combined Wall- and Support-Interference on
Wind Tunnel Models. AGARD-CP-535, 1994.
[6] K. Pettersson and A. Rizzi, Aerodynamic scaling to free flight conditions: Past and present. Progress in Aerospace Sciences vol. 44(4), pp. 295-313, 2008.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:58201", author = "B. J. C. Horsten and L. L. M. Veldhuis", title = "New Hybrid Method to Correct for Wind Tunnel Wall- and Support Interference On-line", abstract = "Because support interference corrections are not properly
understood, engineers mostly rely on expensive dummy measurements
or CFD calculations. This paper presents a method based on uncorrected wind tunnel measurements and fast calculation techniques
(it is a hybrid method) to calculate wall interference, support interference and residual interference (when e.g. a support member
closely approaches the wind tunnel walls) for any type of wind tunnel and support configuration. The method provides with a simple formula
for the calculation of the interference gradient. This gradient is
based on the uncorrected measurements and a successive calculation
of the slopes of the interference-free aerodynamic coefficients. For the latter purpose a new vortex-lattice routine is developed that corrects
the slopes for viscous effects. A test case of a measurement on a wing proves the value of this hybrid method as trends and orders of
magnitudes of the interference are correctly determined.", keywords = "Hybrid method, support interference, wall interference, wind tunnel corrections.", volume = "3", number = "10", pages = "1299-8", }