Accuracy enhancement of wind tunnel aerodynamic coefficients determination based on the coupling of balance data and optical angle of attack measurement

Libsig, Michel; Martinez, Bastien; Juncker, Joseph; Bastide, Myriam; Demeautis, C.

doi:10.3929/ethz-b-000279210

Cited by 2 publications

(1 citation statement)

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“…The pitching motion is recorded using a high-speed camera mounted outside the wind tunnel, perpendicular to the pitching plane. An evaluation tool based on a corner-detection algorithm developed at ISL [17] is used to extract the pitch angle from the recorded images. The accuracy of the corner-following algorithm depends on the number of pixels between the tracking markers on the model, for the setups used the error in the determined pitch angle has been on the order of ±0.01°.…”

Section: Measurement Setupmentioning

confidence: 99%

Low-Interference Wind Tunnel Measurement Technique for Pitch Damping Coefficients at Transonic and Low Supersonic Mach Numbers

2022

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An experimental method for the determination of the pitch damping moment coefficient sum Cmq+Cmα˙ in a wind tunnel at transonic and low supersonic Mach numbers is developed. With support interference being a major issue for dynamic tests at these velocities, a minimum interference wire suspension approach is used. The motion of the wind tunnel model is restricted to a single-degree of freedom pitching oscillation through the geometry of the support system. A statistical evaluation procedure allows the simultaneous evaluation of multiple tests to increase confidence in the results. The influence of the wires as well as nonlinear effects are accounted for. The method is validated in an extensive test series at Mach numbers ranging from 0.6 to 2.0. Two reference missile models—the Basic Finner and the Army-Navy Spinner Rocket (ANSR)—are used. The results agree very well with CFD calculations throughout the transonic range. In comparison to free-flight tests the accuracy is significantly improved and result uncertainties are reduced by an order of magnitude.

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Section: Measurement Setupmentioning

confidence: 99%