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Cascading Tesla Oscillating Flow Diode for Stirling Engine Gas Bearings
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External Online Source: http://www.techbriefs.com/component/content/article/14848
Author and Affiliation:
Dyson, Rodger(NASA Glenn Research Center, Cleveland, OH, United States)
Abstract: Replacing the mechanical check-valve in a Stirling engine with a micromachined, non-moving-part flow diode eliminates moving parts and reduces the risk of microparticle clogging. At very small scales, helium gas has sufficient mass momentum that it can act as a flow controller in a similar way as a transistor can redirect electrical signals with a smaller bias signal. The innovation here forces helium gas to flow in predominantly one direction by offering a clear, straight-path microchannel in one direction of flow, but then through a sophisticated geometry, the reversed flow is forced through a tortuous path. This redirection is achieved by using microfluid channel flow to force the much larger main flow into this tortuous path. While microdiodes have been developed in the past, this innovation cascades Tesla diodes to create a much higher pressure in the gas bearing supply plenum. In addition, the special shape of the leaves captures loose particles that would otherwise clog the microchannel of the gas bearing pads.
Publication Date: Oct 01, 2012
Document ID:
20120016260
(Acquired Nov 29, 2012)
Subject Category: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
Report/Patent Number: LEW-18862-1
Document Type: NASA Tech Brief
Publication Information: NASA Tech Briefs, October 2012; 19; (SEE 20120016252)
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: NASA Glenn Research Center; Cleveland, OH, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: CHANNEL FLOW; DIODES; GAS BEARINGS; GAS FLOW; MICROMACHINING; MICROPARTICLES; OSCILLATING FLOW; RISK; STIRLING ENGINES; TRANSISTORS
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