Dissertation
Microsecond spark as a source of compression and its application as a pressure wave generator
Doctor of Philosophy (Ph.D.), Drexel University
Jan 2017
DOI:
https://doi.org/10.17918/etd-7291
Abstract
Conventional methods of compression are limited in size due to their mechanical components as the devices which rely on compression are becoming smaller. An alternative to mechanical compressors has been developed to meet the needs of small scale compression using microsecond sparks that require almost no moving components. Pulsed plasma generates fast heating and shock waves which produce pressure waves in the working fluid. Spark pressure wave generation offers the advantages of high frequency pulsing and small size without the need for mechanical components which limit the life of the device and require physical space within the compressor. Microsecond spark has been shown within this dissertation to have the capability of generating a temperature of 5,500 K in approximately 1 [mu]s to produce pressure waves within water, air, and helium. Pressure increase up to a 150% inside of the helium was generated and measured. Devices for the practical application of driving Stirling cryogenic coolers using spark have been designed, manufactured, and tested. Numerical modeling using COMSOL was used to observe and verify the pressure wave production and temperature distribution within the system showing that a plasma pressure wave generator is a viable option for period pressure production. The plasma pressure wave generator was constructed to operate while charged to 20 bar of helium and to integrate with a Stirling cryogenic cooler to produce pressure capable of driving the cryocooler at 100 Hz.
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Details
- Title
- Microsecond spark as a source of compression and its application as a pressure wave generator
- Creators
- Nathaniel D. Taylor - DU
- Contributors
- Danil Dobrynin (Advisor) - Drexel University (1970-)Alexander A. Fridman (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xix, 164 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) (1970-2026); Drexel University
- Other Identifier
- 7291; 991014632435704721