Accession Number : AD0439391


Title :   UNSTEADY LIFTING SURFACE THEORY FOR A MARINE PROPELLER OF LOW PITCH ANGLE WITH CHORDWISE LOADING DISTRIBUTION,


Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB


Personal Author(s) : Tsakonas,Stavros ; Jacobs,Winnifred R


Report Date : Jan 1964


Pagination or Media Count : 76


Abstract : This study is third in a series of investigations applying the unsteady lifting surface theory to the marine propeller case. In this investigation, the surface integral equation is solved for a mathematical model where the chordwise loading is taken as the first term of Birnbaum's lift distribution (flat-plate chordwise distribution), in conjunction with Glauert's lift operator, which, in essence, satisfies the chordwise boundary conditions by a weighted average. It is shown that this model is an improvement over the modified Weissinger model used previously in this series, because it contains as a nucleus the exact two-dimensional solution, and thus it provides a sounder basis for dtermining the three-dimensional effects. The blade-loading is determined for a propeller operating in flow disturbanccs induced by the presence of a hull and by the blade-camber effect. The stationary loading obtained by the present model is about 10% less than that obtained by the modified Weissinger model, whereas the nonstationary loading is slightly larger. (Author)


Descriptors :   *MARINE PROPELLERS , PROPELLER BLADES , LOAD DISTRIBUTION , LIFT , HULLS(MARINE) , VIBRATION , INTEGRAL EQUATIONS , NONEQUILIBRIUM FLOW , CAMBER , ACCELERATION , HYDRODYNAMICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE