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1 Chatillon - ONERA - The French Aerospace Lab

Abstract : The Flap code has been developed to predict blade vortex interaction noise at the early stage of development of a rotorcraft. For this purpose, the code needs to be fast and run with a small number of input data. This paper presents the last improvements that have been realized in the framework of the program CleanSky JTI, in which Flap is used to increase a database of noise radiated hemisphere. For each rotorcraft, reference computations are performed by DLR and CIRA using codes with a higher level of modelisation than Flap but also a higher computational time. These computations are then used to calibrate the Flap code which then will generate all the remaining necessary noise hemispheres. Consequently, the generalization of the wake model is necessary to allow good calibration. This is what, beside other improvements and after a short presentation of Flap, is presented in the beginning of the paper. However, the radial position of the vortex roll up and its intensity can not be easily calibrated; consequently, a roll up model is integrated in Flap so that no assumption has to be made. These modifications are presented and the resulting improvements of the results are clearly highlighted. The capacity of the code to predict the noise radiation on several flight configurations using only one calibration is check by comparison with the Onera comprehensive code HMMAP on a variation of the rotor angle of attack.

Keywords : BLADE VORTEX INTERACTION ROTOR NOISE VORTEX ANALYTICAL MODEL PRESCRIBED WAKE ACOUSTIC HELICOPTER





Autor: G. Reboul -

Fuente: https://hal.archives-ouvertes.fr/



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