Abstract No.:	2217
Scheduled at:	Monday, May 03, 2010, Hullet Room 2:40 PM Process Diagnostics 1
Title:	Measurement of particle parameters at detonation spraying
Authors:	Igor Smurov / Ecole Nationale d'ingénieurs de Saint-Etienne (ENISE), France Danil Pervushin / Ecole Nationale d'Ingénieurs de Saint-Etienne (ENISE), DIPI Laboratory, France Vladimir Ulianitsky*/ Lavrentyev Institute of Hydrodynamics SB RAS, Russia Sergey Zlobin/ Lavrentyev Institute of Hydrodynamics SB RAS, Russia Bernard Laget/ Ecole Nationale d'Ingénieurs de Saint-Etienne (ENISE), DIPI Laboratory, France
Abstract:	Measurement of the particle temperature and velocity at detonation spraying is significantly complicated by the pulsed character of the process. In the present study, these parameters are measured for powders with strongly different nature and properties such as WC/Co, Ti and alumina. Experiments are performed using an original computer-controlled detonation spraying installation developed by the authors. The system is distinguished by the pulsed-mode powder feed at locations over the length of the detonation tube. Evolution of the particle-in-flight brightness temperature, velocity and size is examined by an original CCD-camera-based diagnostic tool developed by the authors. A significant spatial separation of the particles along the detonation plume is observed during their acceleration. 15 µm fine particles overtake 45 µm coarse particles by more than 10 plume diameters. For this reason, distributed scanning over the plume length is applied in order to obtain adequate results. A previously developed mathematical model of the process is experimentally validated. Calculations are found to be in a qualitative agreement with the experimental results. As far as the particle-in-flight velocity is concerned, the agreement is even quantitative.

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