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Chapter3. Implementation 27 the coordinate center still falls on the datum point to avoid extensive reposition- ing of the microphones [32]. Figure 3.1: Graphic illustration of the coordinate system used in the Openair experiment and this work. The emission angle θ∗ illustrated in Fig. 3.1 is based on the emission angle θ from the source point to the respective microphone, corrected for the three-dimensional arrangement of the microphone array (see Sect. 3.1.5). 3.1.2 Testing Conditions The tests were carried out under day ambient conditions, which inside the NTF could differ from the outside conditions. The ISA-referenced flow conditions were corrected according to the acoustic Mach number. Meticulous records for each individual test point can be found in the QQ test report. In order to eval- uate the performance of the different nozzles and cowl configurations according to the ICAO noise certification standards, tests were carried out using different flow conditions emulating the behaviour of the engine during approach, cutback and sideline operations. In addition, a flight stream was simulated, in order to provide a realistic simulation of flow conditions during flight. The flight stream reached up to 70 ms−1 for approach and 90 ms−1 for sideline and cutback flight conditions. This test setup differs significantly from the usual setup for noise tests by aeroengine manufacturers, where flight stream simulation and wing interac- tion effects are not included [37].PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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