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2072 |
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Tuesday, May 04, 2010, Sophia Room 2:20 PM Young Scientists |
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Velocity diagnostics for gas velocity distributions in cold gas and plasma spraying using non-resonant laser scattering |
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Sebastian Lange* / Universität der Bundeswehr München, Germany Marco Sieber / Universität der Bundeswehr München IPM/LPT, Germany Jose-Luis Marques/ Universität der Bundeswehr München IPM/LPT, Germany Guenter Forster/ Universität der Bundeswehr München IPM/LPT, Germany Jochen Schein/ Universität der Bundeswehr München IPM/LPT, Germany |
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In cold spray and thermal spray applications, one of the primary factors affecting coating deposition is the location where particles are injected into the gas jet. Therefore, a detailed knowledge of the gas flow distribution is required. Non-resonant laser scattering allows us to spatially resolve the distribution of drift velocity and mass density within the flow, particularly at locations close to the injector. Based on laser scattering, this paper presents a new diagnostic that locally measures the drift velocity, as well as a relative mass density distribution of a gas stream. Its application is mainly focused on cold gas flow, where velocity measurements in a supersonic nozzle, obtained by means of laser scattering, correlate well with theoretical calculations and particle image velocimetry (PIV) experimental results. |