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Chapter3. Implementation 29 3.1.4 Engine Setup This section deals with the configuration of the testing rig, comprising the model aeroengine with its different wing, cowling and nozzle configurations as well as the linear microphone array for sound directivity analysis. In addition, the exci- tation of broadband and tonal noise via external speakers is discussed. Though tonal noise generation was part of the tests, it is not subject of this thesis. Nozzle and cowling The nozzles were designed by RRD and SN. The short cowl (SC) configuration is based on a general outlet system with BPR 9. It was designed aerodynamically by RRUK and mechanically by SN. It was originally produced for the European SI- LENCE(R) project, the predecessor of the OPENAIR project (2001-2006) and was reused to minimize testing costs and provide the opportunity for data compari- son with previous tests. The nozzle was designed for maximum noise reduction at approach, cutback and sideline conditions as well as for minimal aerodynamic losses during cruise. The long cowl (LC) configuration is based on an outlet sys- tem with BPR 5, originally designed by RRD and produced within the scope of an earlier project. A CAD draft of both configurations is shown in Fig. 3.3 [32, 37]. Figure 3.3: Short cowl (left) and long cowl (right) engine configurations used during testing [37]. The SC configuration was tested with three different nozzle geometries. The base- line configuration represents the standard design of the test aeroengine, whereas the scarfed and serrated nozzles were developed by Airbus France specifically for this test. The sinusoidal serrations were carved upstream into the nozzle such as to not move the bypass exit plane [37]. The LC engine was tested with baseline and scarfed nozzles only. Figure 3.4 shows the baseline and scarfed nozzle used throughout the test mounted on the LC configuration.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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