Adhesion of Volcanic Ash Particles under Controlled Conditions and Implications for Their Deposition in Gas Turbines

Abstract

A particular (representative) type of ash has been used in this study, having a particle size range of ∼10–70 μm. Experimental particle adhesion rate data are considered in conjunction with CFD modeling of particle velocities and temperatures. This ash becomes soft above ∼700 °C and it has been confirmed that a sharp increase is observed in the likelihood of adhesion as particle temperatures move into this range. Particle size is important and those in the approximate range 10–30 μm are most likely to adhere. This corresponds fairly closely with the size range that is most likely to enter a combustion chamber and turbine.