This paper describes propeller-wing interference measurements on a half model installed in the 3 by 4 meters Indonesian Low Speed Wind Tunnel (ILST). The wing of the model had a 2.1 meter (semi) span on which a nacelle and a 70 cm diameter propeller were mounted. To study the interaction effects with higher lift coefficients a flap could be mounted, covering about 70 % of the span. Wing, flap and fuselage were all extensively equipped with pressure taps. Forces and moments measurements were performed by both a external balance, measuring the overall model loads, and a rotating shaft balance (RSB), measuring the propeller forces and moments. The simultaneous use of a RSB and an external balance provided the opportunity to determine the interaction forces on both propeller and airframe. This combination of thrust/drag measurements with the RSB and the external balance was used in a set of bookkeeping procedures to determine the installed thrust, drag and the changes in thrust and drag when compared with the isolated propeller and the blades-off configuration. By using the RSB it was also possible to determine the propeller contributions to the other overall force- and moment-components such as the lift force and pitching moment. The magnitude of the interference effects is illustrated by test results on a flaps-in configuration for a thrust coefficient of Tc = 2.5.
Propeller-wing interference effects at low speed conditions
Propeller-Flügel-Interferenzeffekte bei niedrigen Geschwindigkeiten
1996
16 Seiten, 14 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
Propeller Wing Interference Effects at Low Speed Condition
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