Predicted and measured plate velocities induced by turbulent boundary layers

• A method for the prediction of velocity levels of a fuselage plate excited by turbulent boundary layers is described. The aim is to identify a method for the prediction of the relative changes of the velocity levels caused by variations of plate geometry and flight conditions. The Corcos, Efimtsov and Chase models are used to characterize the dynamic surface pressure cross-spectra. Predicted results using these models are compared with the result of in-flight measurements of plate velocities. It is found that the Corcos model gives the best agreement with the measured results for three different flight conditions. The Efimtsov extension and Chase models tend to underestimate the plate response in the lower frequency range. It is evident that the velocity level of the plate elements of the fuselage very much depends on the speed of the aircraft. An increase of the speed of the aircraft by 10% is likely to increase the plate velocity level by 3 dB and a reduction of the speed by 10% would give a reduction of 3 dB.

Nyckelord

Chase model

Corcos model

Cross spectra

Dynamic surface pressure

Flight conditions

Lower frequencies

Measured results

Plate elements

Plate geometry

Plate velocity

Turbulent boundary layers

Aircraft

Fuselages

Velocity

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)