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3 Implementation The experiment presented in this thesis was carried out between 20th June to 17th August 2012 at the noise test facility (NTF) of QinetiQ in Farnborough, UK as part of the OPENAIR European Research Project [32]. It was designed as a joint ven- ture of multiple European companies that are leading in the field of aeroacous- tical research. The research team was composed of scientists from DLR, RRUK, RRD, SN, Airbus and QQ [2]. The primary aim of the studies was to evaluate the influence of scarfed and serrated nozzle geometries regarding the rearward noise production of the aeroengine. Furthermore, the effect of a scaled wing model on the acoustics and fluid dynamics of the jet were being researched [2, 32]. The following chapter deals with the test preparation and setup (Sect. 3.1) and the experiments and their respective data sets (Sect. 3.2). 3.1 Experimental Setup and Execution This section presents the test facility layout, the engine setup and the microphone arrangements used for the tests. It provides a brief description of those features in order to facilitate an easier understanding of the data evaluation in Chap. 4. Please refer to the individual test reports for further information on test conduc- tion (see RR [2], DLR [32] and QQ [37]). 3.1.1 Coordinate System The coordinate system used was cartesian, with the x-coordinate at a datum point centered on the engine axis halfway between the core and the bypass nozzle ori- ented in the direction of the mean flow. The y and z coordinates use the righthand system and point 270◦ and 180◦ from the top dead reference center, respectively. This coordinate system is used for all configurations. Figure 3.1 illustrates the co- ordinate system used. During the longcowl tests, the engine was moved so that 26PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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