Abstract
Turbofan engines may use a device known as a lobe mixer in the exhaust duct, in which the core flow and the fan flow are rapidly mixed with strong secondary flows. This mixing process provides a means of achieving significant performance gains and reducing jet noise. Although this fact has been known for some time, the details of the mixing process within the mixing duct and exhaust nozzle have not been well understood. We measured the three-dimensional turbulent flow in a scale model of an exhaust duct with a lobe mixer by using a hot-wire anemometer, and clarified, experimentally, the basic characteristics of the mixing process.
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