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Chapter3. Implementation 28 3.1.3 Noise Test Facility The QinetiQ NTF is an almost cubic, highly anechoic chamber, specifically de- signed for jet noise research (Fig. 3.2). The walls are 26x27 m long and 15 m high. The chamber is ventilated in order to prevent hot gas recirculation and to provide a steady air flow. The NTF can be used to test 1/10th scaled nozzles, which are mounted at a height of 8,73 m. The core and bypass air flows are provided by a centrifugal compressor at a maximum combined mass flow of m ̇ core,BP = 15 kg/s at p = 3 bar. The NTF also allows the simulation of a flight stream up to Ma = 0.33. The flight stream is supplied by a very large blower and reaches a mass flow of up to m ̇ FS = 350 kg/s. The whole testing chamber is lined with 22,000 acoustic wedge liners, ensuring a most anechoic testing environment. In addition, an ex- tensive silencing arrangement clads the air flow entry passages, thus warranting, that the noise produced by the flight stream is jet mixing noise only [37]. Figure 3.2: An inside view of the QQ NTF in Farnborough, UK, showing the rig as- sembly, the linear microphone array and farfield arrays of joint researching teams [37].PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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