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Chapter4. DataAnalysis 49 The results show very clear sound events for all TOBs except the highest, where the aliasing effect visibly distorts the plot characteristics. For this calculation, σ1 was set to 0.001. The plots show three clear sound events that vary over the frequency. For low frequencies up to 2000 Hz, a single event, possibly due to jet mixing noise at or behind the flight stream nozzle, is detected at x/dBypass ≈ −10. For very low frequencies, this event possesses uniform directivity, whereas at higher frequencies the event is picked up only by the first half of the microphone array. This phenomenon, as well as the SPL of the different plots, coincide very well with the observations made for Fig. 4.5. For f 2500Hz TOB, a second sound event occurs at x/dBypass ≈ −4, which is most likely linked to flight stream jet mixing noise due to potential core col- lapsing. This event is not picked up by the rear quarter of the microphone array, possibly because of a combination of atmospheric attenuation and σ1 usage. At the 3150 Hz TOB, a third sound event occurs upstream of the other two. As it is detected at this TOB only, it likely stems from a tonal noise source, e.g. an obsta- cle shedding vortices at a set frequency. The plots in Fig 4.7 show, that the flight stream produces clear sound events upstream of the nozzle that are outside the source position grid used otherwise. The FS dominates the sound fields at very low frequencies outside of the analysis scope of this thesis. 4.3 ICAO Reference Measurement Points This section deals with the test points that simulate the ICAO noise certification reference points, namely sideline (SL), cutback (CB) and approach (APP). The relevant TPs are listed in Table 4.1. The tests were all carried out on a short- cowl engine with baseline nozzle configuration without any additional sound excitation. 4.3.1 Reference Measurement Points without Flight Stream The following subsection first presents the analysis of the uninstalled and in- stalled sideline measurement points in greater detail. For the remaining CB and APP TPs, only the most interesting events will be shown.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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