Dust Research Studies. Part I. Mechanisms of Dust Erosion. Part II. The Study of Sintering of Dust at High Temperatures

摘要

The report presents the results of experimental investigations of the erosion of various metals by the impact of dust particles. The experimental results are shown to be described by an equation containing two parameters that represent the energy requirements for material removal from the specimen surface. The values of these energy parameters are given for several materials for a range of dust velocities, impact angles, dust size distributions, and specimen temperatures. A limited program was performed to determine the fundamental properties involved in the sintering of dusts, taken from the Yuma Proving Ground area, at moderately high temperatures. This was done by exposing a stainless steel plate (1-1/2 in. sq.) to dust laden hot gages. A modified gas turbine combustion can fueled with JP-4 was operated over a range of air-fuel ratios to obtain the desired temperatures. Gas velocity was approximately 200 fps, a value not too far from actual velocities found in gas turbines. Sintering of the Yuma dust began at approximately 1650F and grew in severity with increased temperature. This brief laboratory study confirmed previous gas turbine failures encountered during field operation in a dust environment. Recommendations are made for further study of sintering as related to dust ingestion by gas turbines. (Author)