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Investigation of ducted propfan engines

This project investigated the aerodynamic engine/airframe interference effects in the context of the new class of ducted propfan engines. The program makes use of an existing wind tunnel model and 2 model engine simulators one ducted propfan and one turbofan. The equipment was completed by designing and manufacturing a second simulator for each engine type. In the wind tunnel program 2 configurations are investigated:
model without engines;
model with 2 turbofans.
The test program covers force distribution measurements and pressure distribution measurements for different Mach numbers, incidence and sideslip settings. Further on, the engine power setting was varied.

To get detailed information about the interference effects the flow field was analyzed using the wing pressure distribution in the vicinity of the engine. In all cases the installation of the engine leads to a significant reduction of the wing leading edge suction peak and to an increase in pressure over the whole span. On the lower surface, the interference effects for this type of engine are small.

The following theoretical calculations were performed:
use of an existing Euler code for investigations of interference effects of agreed test conditions;
coupling of the grid generation procedure and the Euler code with a viscous jet model;
application of a postprocessing technique on the existing experimental data and theoretical results.
In all cases the engine installation leads to a significant reduction in wing leading edge suction peak and increasing pressure on the wing upper surface. This result is in very good agreement with the experimental results. A direct comparison of experiment and calculation of the wing pressure distribution for the model with the turbofan engine is in good agreement for all sections. That means, the solution of the Euler equations accurately models the interference phenomena in this particular low speed case.

Reported by

Daimler-Benz Aerospace Airbus GmbH
Huenefeldstasse 1-5
28199 Bremen
Germany
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