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Chapter2. Theory 11 Figure 2.3: Short-cowl nozzle configuration. The core duct extends beyond the bypass duct [26]. two jets (2), which decreases the average speed and homogenizes the temperature distribution. As such, the exiting common jet is colder and slower as for the SC nozzle (1), thus emitting less noise. The mixing process can be accelerated by utilizing dedicated subsidiary structures, e.g. chevron nozzles or forced mixers. Again, the mixing is completed, when the jet has mixed with the atmosphere (4). The advantage in noise emission for this configuration is achieved by elongating the bypass duct, which means a heavier and more expensive engine, which in turn raises the SFC [4, 33]. Figure 2.4: Long-cowl nozzle configuration. The bypass duct extends beyond the core duct [26] . In modern conventional aircraft configurations, engines are typically mounted under the wing. As such, the jet exiting the engine is influenced by the presence of the wing, especially so during take-off and landing, when flaps are deployed. The effects on jet flow and noise radiation are summarized under the term ’in- stallation effects’ [20]. When the jet mixing turbulent structures are broken and refracted by the wing and flaps, additional swirl vortices are created that travelPDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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