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5 Conclusion and Outlook The subject of this thesis was the analysis of the aeroacoustic OPENAIR experi- ment carried out in summer 2012 in order to examine the sound field of the core and bypass jet flow of a generic turbofan aeroengine under a multitude of test conditions. These conditions included different nozzle geometries and cowling configurations, flight stream simulation emulating ICAO noise measurement ref- erence points, broadband sound excitation simulating rearward fan noise and in- stallation effects evoked by the presence of the aircraft wing and pylon. The thesis employed the sound directivity analysis algorithm SODIX that was developed by DLR in order to assess the sound field of the aeroengine jet. The experience that was gained during analysis preparation on how to configure the source directiv- ity analysis tool SODIX is presented, including recommendations regarding the source position grid design as well as the slack variable and iteration steps values. The thesis also served as a verification basis for SODIX, offering insight into vari- ous issues that were yet undiscovered, such as the aliasing for short wavelengths and low-frequency sound field dilutation. Though the algorithm proved more stable than established beamforming methods according to experience, there is still potential for optimisation. By establishing a theoretical basis of the working priniple of turbomachinery, jet fluid mechanics and aeroacoustics, the advantages and disadvantages of various configuration combinations were successfully shown. In accordance with the the- ory, the maximum SPL was found to be at x/d = 5 with St = 1 with sources mov- ing closer to the nozzle for increasing frequencies and vice versa. When a wing was present, the source field changed: At higher frequencies, additional sources appeared on the wing underside and at the flap tip. When present, the flight stream moved sources downstream, because the sound waves were refracted in the shear layers between the jets of different velocity. Wing and flight stream presence were found to have a comparable influence on the sound intensity: The former effect increased the maximum SPL of the sound field by approximately 5 − 10 dB, whereas the latter decreased the noise emission by generally the same 76PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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