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Chapter4. DataAnalysis 68 lower sound emission due to the serrated nozzle. Because of a defective micro- phone, the dynamic range of the plot had to be limited to 15 dB. (a) TOB 500 Hz (b) TOB 5000 Hz Figure 4.23: Serrated nozzle configuration compared to the baseline nozzle, sideline con- dition, no wing installed. Whereas the sound field at 500 Hz does not allow a clear interpretation due to its blurred appearance, it does reflect the trend of the high frequency plot. In general, the serrated nozzle seems to reduce the SPL in the mixing area of the jets by about 5 dB. In other areas of the sound field whose absolute SPL is well below the main source, the SPL is increased. Comparing the SPL maximum of all SODIX plots, the serrated nozzle provides an advantage of 1 − 4 dB for frequencies below 1600 Hz and above 4000 Hz. Inbetween this span, the serrated nozzle plots show an absolute increase of roughly 1 − 2 dB. This behaviour coincides with the result obtained by RR for frequencies up to 4000 Hz; above this threshold, the average maximum SPL should increase when using serrated nozzles according to the data analysed by Rolls-Royce. This difference can be attributed to the fact that SODIX analyses the full sound field instead of just the spectra of a polar microphone array. In addition, the linear microphone array was placed in the near field of the nozzle, whereas the polar array was located in the far field. All in all, the serrated nozzle achieves the expected sound reduction, but it has to be designed very carefully in order to avoid a high frequency noise increase which could outweigh the low frequency benefits, resulting in large implementation costs when applied to civil aviation engines. Despite this fact, so-called chevron nozzles have become widely used in modern civil aeroengines.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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