Derivation of & Introduction to Flap Lift Cavitation Equations and Cavitation Buckets Green & Wright 10 Aug 76(0128)
A powerful equation for flap lift cavitation has been derived as a result of all previous flap lift investigations. Up until this report, flap control of cavitation was not a state-of-the-art concept. Now that an easy-to-understand, accurate method of determining cavitation characteristics has been derived, further applications and extensive investigations of flap control are possible at a greatly reduced cost, since the need for costly computer time and extensive programs is no longer required. Through the use of known equations for incidence lift and Allen's flap velocity distributions, the foil cavitation equation was derived. A check was performed on the resulting bucket by assuming a zero pitch angle and trimmed flaps, and comparing it to the curve for zero flap deflection and the curve for incidence lift. Deflection angle equations for the desired lg case have been formulated through the use of "reference terms" which were in themselves derived as a necessity to this note.