G0501103 A Study on the Estimate of Stagnant Temperature in Cold Spray

Abstract

Cold spray can make a coating on a wide variety of mechanical parts by spraying solid particles accelerated by a high speed gas flow through a converging-diverging nozzle. In cold spray, the stagnation temperature upstream of nozzle throat is one of the most important parameters which governs the coating quality, however, accurate measurement of the stagnation temperature, in a two-phase gas-solid flow, is impractical using a conventional way, such as thermocouple. In this study, the stagnation temperature is estimated by gas dynamic method using the mass flow rate, the stagnation pressure, and the accuracy of the estimated values is discussed.