Performance prediction of solid particle erosion in fluidic oscillators for fluidic hammers based on CFD-DPM

Abstract

Fluidic oscillator (FO), the core part of fluidic hammer, is sensitive to erosion due to high flow velocity and slurry concentrations, limiting the service life and efficiency of the fluidic hammer. In the past, the erosion prediction of FO was independent of the impact body motion, which was quite different from the actual situation. Therefore, the erosion prediction of FO was carried out through CFD-DPM in this study considering the flow field coupled with the impact body motion. The results showed that the numerical predictions coincided with the experimental results qualitatively. Then, the effects of flow rate, particle concentration, particle size and flow properties of drilling fluids on the erosion of FO were predicted in turn through this method. Meanwhile, the erosion parameters of cumulative erosion, erosion asymmetry degree and erosion rate were interpreted and analyzed. According to the prediction results, some suggestions for drilling field operation were put forward.