Liquid crystal mapping of jet crossflow interactions
Johnson, Michael David
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The use of liquid crystal thermography is discussed as a technique for visualizing the disturbance field created on a surface from which a jet is injected into a crossing flow. The study is part of an ongoing investigation of the performance of jet steering systems such as ship bow thrusters. An experimental apparatus was designed and built to provide a heated surface coated with liquid crystals. For a range of jet-to-crossflow velocity ratios, the temperature field on the flat plate was visually represented. The technique allowed continual visual observation of the cooling effects of the jet as jet velocity increased. It also showed the cooling pattern similarities that exist at the same velocity ratios for different crossflow velocities. Strong visual similarities were shown to exist between the temperature distribution on the flat plate as depicted by the liquid crystals and the theoretical surface velocity field around a jet modeled as a symmetrical foil near the point of injection and a vortex sheet in the plumes.
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