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Chapter4. DataAnalysis 64 exemplified on TOB 2000 Hz in Fig. 4.18(a). The sound field with the wing instal- lation is similar, though reflections are detected at the half wing span and at the wing tip for this frequency. The maximum SPL is about 2 dB higher when a wing is installed. (a) Isolated (b) Installed Figure 4.18: Broadband noise excitation with no additional flow (DLR 306 and DLR 383), TOB 2000 Hz. Increasing the dynamic range to the absolute maximum of the plot, however, re- veals another aspect of the no flow tests. Throughout all frequencies, coherent patterns occur in the plots, see Fig. 4.19. This cannot be attributed to the alias- ing effect discussed in Sect. 4.1, as the trace wave length adheres to λs < 2∆xm at lower frequencies and may instead be a result of the spatially discrete noise simulation of the speaker rings (Fig. 3.5). Experience showed, that SODIX has difficulties localizing the position of coherent sources, such as the speakers, re- sulting in unphysical patterns. As for the CB and APP TPs (Fig. 4.17), the isolated plot shows areas of extremely low sound pressure. (a) Isolated, DLR 306 (b) Installed, DLR 383 Figure 4.19: Broadband noise excitation with no additional flow (DLR 306 and DLR 383), TOB 2000 Hz. Dynamic range of the plot is absolute SPL maximum.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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