Direct contact-less velocity measurement in high velocity gas flows

作者：Lange S^*; Sieber M; Marques J L; Forster G; Schein J

来源：Materialwissenschaft und Werkstofftechnik, 2010, 41(6): 422-429.

DOI：10.1002/mawe.201000622

• diagnostics
• gas velocity
• laser scattering
• particle imaging velocimetry (PIV)
• supersonic flow

Thermal spraying, as one of the key industries of the 21st century, is being developed particularly due to its potential in reducing production costs. The possibility of a deposition of high quality coatings requires a deep knowledge of each step involved in the spraying process. One important factor are the properties of the gas flow close to the outlet of the flame generator, if the reproducibility of the sprayed coatings is to be achieved, as well as their production cost reduction. The optimisation of the injection parameters for different powders is the main object of this work. This paper presents a robust contact-less optical diagnostic technique for high velocity gas flows, based in the measurement of the Doppler shift of scattered laser light. Additionally, in order to validate these measurements, a supersonic nozzle of known Mach number at outlet has been designed and measured with the well established particle imaging velocimetry technique.

• 出版日期2010-6