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4 Data Analysis This chapter discusses the results of the conducted SODIX simulation runs. First, the aliasing effect introduced in Sect. 3.2.2, that is present at high frequencies is analysed and possible reasons for its occurence are presented. Second, the effects of flight stream presence on the overall flow conditions are elaborated. In the following sections, the various build configurations are presented in order: • ICAO noise certification flight conditions with and without a simulated flight stream, • test runs with simulated rearward fan broadband noise, • baseline, scarfed and serrated nozzle configurations and • short- and long-cowl engine configurations. The focus lies on the comparison of uninstalled and installed jet noise. The test cases without flight stream will only be analysed when comparing the ICAO ref- erence measurement simulation points (Sect. 4.3). After this, these cases will be excluded from future analysis, as their sound field does not represent common flight situations. 4.1 Aliasing Investigation of high TOB SODIX plots yields an unforeseen problem, indepen- dent of the source allocation used. Using the OPENAIR raw data, SODIX is not able to determine the source position of the recorded cross-spectral sound inten- sity unambiguously for frequencies f 8000 Hz. Instead, a secondary emission area is located at the rear end of the source positions, as evidenced by Fig. 4.1(a) for TP DLR 317. This effect occurs first at the distant site of the source direc- tivity matrix and moves closer to the nozzle for increasing frequencies, showing harmonic qualities for higher TOB (see Fig. 4.1(b)). 43PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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