Validation of efficient euler algorithms for advanved propellers under transonic and subsonic conditions

Two numerical methods have been developed for the computation of steady axisymmetric and unsteady non- axisymmetric advanced propeller flows respectively. A multistage Runge-Kutta time-stepping scheme with central differencing is used as the basic algorithm in both methods. The steady flow solver is explicit in time while the unsteady flow solver uses a fully implicit time discretisation. Efficient acceleration devices, typical of explicit steady-state schemes, are used with both methods to accelerate convergence. The steady flow solver is validated by comparing predictions of the flow around a two-bladed and a six-bladed propeller with measurements, including PFV data. Results are also presented from a time-dependent calculation of the non-axisym- metric flow around a six-bladed advanced propeller at incidence.