Graduate Thesis Or Dissertation
 

Application of high speed motion neutron radiography techniques to liquid streams injected into a pressurized steel chamber

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rb68xf65b

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  • A high speed motion neutron radiography system has been developed at Oregon State University which is capable of taking high speed neutron radiographs of events which occur on the order of one to two milliseconds or more. This system was used previously to demonstrate the application of high speed motion neutron radiography techniques to two phase flow and to the burning of solid propellants. Results of this effort showed the burning patterns and relative distributions of the propellant and gases during the burning of these propellants. This system has been modified and the techniques adapted and further developed for the investigation of similar phenomena which occur with the burning of liquid propellants. The purpose of this thesis is to demonstrate the feasibility of using the new system and techniques for the investigation of liquid streams which were used to simulate the injection of liquid propellants into a pressurized steel chamber. Examples of the application of these new techniques to liquid streams injected into an unpressurized steel chamber are presented. The high speed system is capable of taking neutron radiography movies at frame rates up to about 11,000 frames per second, although about 5000 frames per second proved to be adequate for liquid streams. In order to use the high speed system for liquid streams several modifications and improvements were investigated, especially with regards to the synchronization method. A new fission probe method was developed which provided 100% reliability in the synchronization of events (over four orders of magnitude in time are covered) as compared with the 50% rate experienced with the previous time delay method. Other modifications include an improved method of masking of the object/event, an improved imaging system including a new image intensifier, new scintillator screens, and a new fiber optics coupling, and several methods of neutron flux enhancement. With the new system and techniques the position, distribution, and relative motion and sizes of liquid streams injected into a steel pipe or chamber could be measured. When applied to burning liquid propellants the distribution of the liquid and gas phases of the propellant could be determined. Applications of the current Oregon State University High Speed Motion Neutron Radiography Facility include the investigation of the flow dispersion patterns of liquid streams due to flow blockages or disruption objects; the investigation of diesel fuel injection mechanisms; and the investigation of a wide range of two phase flow situations, with particular emphasis on nuclear reactor related phenomena such as boiling boundaries, quench front motion, and boiling regimes.
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