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Chapter4. DataAnalysis 66 (a) Isolated, DLR 350 (b) Installed, DLR 444 Figure 4.21: Broadband noise excitation with sideline flow conditions and flight stream enabled, TOB 2000 Hz. Dynamic range of the plot is absolute SPL maxi- mum. In conclusion, the broadband sound excitation used in the scope of this experi- ment raises the maximum SPL by an average 10 dB compared to test cases with- out additional noise generation. Moreover, the BB noise is comparably louder than the flight stream mixing noise, which was intented according to the test re- ports. The presence of flight and core streams enhances the total SPL of the sound field even further. The broadband noise sources are located close to the nozzle, have a uniform directivity and with increasing distance from the nozzle there are fewer and weaker sources. 4.5 Nozzle Configurations In this Section, the effects of the serrated and scarfed nozzle geometries in com- parison to the baseline nozzle are assessed. In order to reduce the amount of data, all tests mentioned in this Section were carried out using sideline conditions with flight stream, because this is the most representative and critical condition of all the test conditions available. Table 4.3 lists the test points and their parameters. Comparisons are then made to the baseline nozzle with SL and FS (DLR 325). 4.5.1 Serrated Nozzle Full-scale spectral analysis by Rolls-Royce acquired via personal communication suggests that the serrated nozzle installation provides an up to 3 dB noise de- crease at low frequencies equivalent to up to 1250 Hz. Above this threshold, thePDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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