SMALL-DISTURBANCE-CFD-BASED AIRCRAFT FLUTTER INVESTIGATION INCLUDING POWERED ENGINE MODEL

Vladyslav Rozov, Marco Stuhlpfarrer, Mario Fernandez Osma, Christian Breitsamter

DOI Number: N/A

Conference number: IFASD-2019-075

Aeroelastic behavior of aircraft is signiﬁcantly affected by the presence of engines mounted under the wings. Powered engines inﬂuence the unsteady aerodynamics on the one hand and lead to additional unsteady forces due to thrust vector oscillations on the other hand. This work focuses on the incorporation of aerodynamic engine effects into a small disturbance CFD framework to enhance the modeling accuracy of unsteady aerodynamics of aircraft. The effects are numerically modeled by mimicking physically reasonable ﬂow conditions at the intake and nozzle planes of the engine nacelle. Subsequently, the inﬂuence of the engine effects on the ﬂutter behavior of an aircraft is studied employing the small-disturbance-CFD-based ﬂutter analysis. The basis for the investigation is the Common Research Model, which represents a modern transonic commercial airliner with a cruise Mach number of 0.85. Two conﬁgurations are considered: aircraft with passive engines represented by through-ﬂow nacelles and aircraft with powered engines, where the novel small disturbance engine model is applied. The results are compared in terms of the ﬂutter trends and the predicted ﬂutter boundary. Furthermore, the impact of the modal induced thrust oscillations on the aeroelastic behavior of the aircraft is discussed.

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aerodynamic engine effects, Common Research Model, linearized boundary conditions, linearized CFD, small disturbance CFD

In Categories: Computational Flutter, IFASD 2019

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