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Verifying microexhausts with schlieren imaging
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
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2010 (English)In: Proceedings of the 2nd International Conference on Space Propulsion, San Sebastián, Spain, May 3-6, 2010, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Schlieren imaging is a method to visualize differences in refractive index within a medium. It is an inexpensive, yet powerful and straightforward tool, for sensitive and high-resolution visualization of gas flows. Here, heated cold gas microthrusters were studied with schlieren imaging techniques. The thruster chips are manufactured using MEMS technology, and measure 22*22*0.85 mm. The nozzles are approximately 20 µm wide at the throat, and 350 µm wide at the exit. Through these studies, verification and direct visualization of the functionality of the thrusters were possible. At atmospheric pressure, slipping of the exhaust was observed, due to the severe overexpansion of the nozzle. In vacuum, the nozzle was underexpanded, and the flow was seen to be supersonic. There was a measurable change in the exhaust with heaters activated. It was also shown that the method can be used to detect leaks, making it a valuable, quick, safe, and inexpensive aid in quality control of the thrusters.

Place, publisher, year, edition, pages
2010.
Keyword [en]
micropropulsion, schlieren imaging, microthrusters
National Category
Other Materials Engineering
Research subject
Engineering Science with specialization in Microsystems Technology
Identifiers
URN: urn:nbn:se:uu:diva-139219OAI: oai:DiVA.org:uu-139219DiVA, id: diva2:380942
Conference
2nd International Conference on Space Propulsion, San Sebastián, Spain, May 3-6, 2010
Available from: 2010-12-23 Created: 2010-12-22 Last updated: 2016-04-19Bibliographically approved

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CiteExportLink to record
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