VORTEX DYNAMICS OF BLADE-BLADE INTERACTION

A time domain method has been developed for treatments of vortex dynam ics in all classes of blade-blade interaction problems. A new vortex i mpingement condition is introduced to the discrete vortex tracking sch eme and was found most effective in handling the vortex-airfoil intera ction and the blade-blade interaction (BBI) problems. Present results are verified with all classical solutions and are found in good agreem ent with almost all existing solutions. The present BBI study conclude s that any front blade movement mill induce a strong interaction betwe en the make and the rear blade; hence, it alters drastically the lift response and the wake structure. Any rear blade movement only induces a weak interaction, hence rendering the blade system ineffective.