Liquid crystal mapping of jet crossflow interactions
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Authors
Johnson, Michael David
Subjects
Liquid crystals
Thermography
Lateral thrust units
Bow thruster
Jet-crossflow interaction
Jets in crossflow
Isotherms
Flat plate
Thermography
Lateral thrust units
Bow thruster
Jet-crossflow interaction
Jets in crossflow
Isotherms
Flat plate
Advisors
Nunn, R.H.
Date of Issue
1981-12
Date
December 1981
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.