A Method for Predicting Thrust Deduction Using Propeller Lifting Surface Theory.

摘要

An analytical method is presented for predicting the added resistance (thrust deduction) arising from propeller-hull interaction. The theory is formulated in terms of the potential flow about the hull and appendages which are represented by surface singularity distributions. The influence of the propeller is derived from lifting-surface theory including the effects of blade number, thickness, skew, rake, and radial and chordwise load distribution. In order to determine the interaction force, propeller-induced velocities and the modified hull pressure distribution are computed with appropriate corrections to the hull singularities. The axial force is then derived by integration of the pressure on the hull and also by application of the steady-flow Lagally theorem.