Experimental Particle Separation Efficiency for an Axisymmetric-Sector Inertial Particle Separator

An Inertial Particle Separator (IPS) is a device used in aircraft engines to remove sand and other particulates from ingested air, protecting engine components from erosion. This study presents a comprehensive experimental investigation of an axisymmetric IPS system in terms of particle separation efficiency. The effects of different particle sizes (A2, AFRL03, and A4 test dusts) and flow split ratios on separation efficiency were examined, incorporating rigorous uncertainty and repeatability analyses. A refined startup procedure was developed to minimize particle reingestion, significantly improving result consistency and accuracy. The study provides detailed experimental data for a reduced-flow-turning IPS geometry designed to minimize pressure losses. Results demonstrate the significant influence of particle size distribution and Stokes number on separation performance, with larger particles (A4) exhibiting higher separation efficiencies compared to smaller particles (A2). A robust dataset for validating advanced computational models is presented and findings contribute to ongoing efforts to enhance engine protection and performance in challenging operational environments, particularly for rotorcraft and other aircraft operating in sandy conditions.