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Chapter4. DataAnalysis 56 (a) Isolated. (b) Installed. Figure 4.11: Isolated and installed approach TPs (DLR 287 and 395), short cowl engine, TOB 1000 Hz. The cutback TPs show similar behaviour. x/d = 0 − 2, which coincides with the chord dimension of the wing and could result from turbulent surface interaction. During approach, the SPL difference is greater by approximately 3 dB. Downstream of the wing, the SPL of both installed and uninstalled wing jet are of similar magnitude, meaning that the noticable SPL increase happens not in the jet mixing area, but near the wing due to flow-surface interaction and subsequent turbulence generation, which agrees with the theory presented in Sect. 2.3.3. 4.3.2 Reference Measurement Points with Flight Stream The second part of the reference point analysis deals with the same uninstalled and installed test configurations as the previous one, only this time with flight stream simulation. All other testing conditions remain unchanged. This includes the engine configuration, nozzle design as well as core and bypass flow velocities. Therefore, all changes to the sound field can be attributed to the flight stream. The flight stream velocity is 70 ms−1 for approach and 90 ms−1 for cutback and side- line flow conditions. As before, the focus of this section is on the SL condition; comparisons will be made with the isolated test points shown in the previous sec- tion. Cutback and approach TPs are being explained in reference to the sideline condition presented. Isolated sideline ICAO reference point with flight stream Figure 4.12 shows the SODIX plots for FS sideline conditions without wing in- stallation for the same TOB as Fig. 4.8.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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