Numerical and experimental study of 3D unsteady flow in a lawn mower for prediction of pressure pulsation and noise

Experiments fulfilled in CETIM have shown that tonal blade-passing-frequency (BPF) noise becomes predominant for lawn-mowers with a big rotor diameter. 2-D and 3-D CFD unsteady computations give a clear picture of pseudo-sound perturbation inside the casing of lawn-mower. Method of representation of unsteady motion of compressible fluid with subsonic flow as a sum of vortex mode (pseudo-sound) and acoustical mode (airborne sound) is used to define the sound near field.

Download: M.Bockoff, K.Mones, S.Timouchev, K.Ilhicov, A.Aksenov: Numerical and experimental study of 3D unsteady flow in a lawn mower for prediction of pressure pulsation and noise, 2003 year, PDF, 2MB