Dynamic-stall measurements using time-resolved pressure-sensitive paint on double-swept rotor blades

Abstract The study presents an optimized pressure-sensitive paint (PSP) measurement system that was applied to investigate unsteady surface pressures on recently developed double-swept rotor blades in the test facility at German Aerospace Center (DLR) Göttingen. featured improved version of a double-shutter camera designed reduce image blur PSP measurements fast rotating blades. It also comprised DLR’s sensor, capture transient flow phenomena (iPSP). Unsteady were acquired across outer 65% blade with iPSP and several radial sections by fast-response pressure transducers blade-tip Mach Reynolds numbers $$\mathrm {M}_\mathrm{tip} = 0.282-0.285$$ M tip = 0.282 - 0.285 {Re}_\mathrm{tip}= 5.84-5.95 \times 10^5$$ Re 5.84 5.95 × 10 5 . unique experimental setup allowed for scanning entire pitch cycle phase resolution $${0.225}\,{\mathrm{deg}}$$ 0.225 deg azimuth different collective cyclic-pitch settings. Experimental results both investigated settings are compared detail delayed detached eddy simulation using solver FLOWer visualizations from Reynolds-averaged Navier–Stokes (URANS) computations TAU code. findings reveal detailed yet unseen insight into footprint undergoing dynamic stall allow deducing “stall maps”, where confined areas stalled identifiable as function phase. Graphical abstract