Analysis of Contra-Rotating Propellers in Setady Flow by a Vortex Lattice Method

J. Ocean Eng. Technol. 2000;14(2):36-43.

와류격자법에 의한 정상유동중의 상반회신 프로펠러 성능해석

서성부

부산대학교 조선·해양공학과 기계기술연구소

Keywords: Vortex lattic method, Contra-rotating propeller, Propeller, Time-averaged velocity, Thrust & torque coefficient

핵심용어: 와류격자법, 상반회전 프로펠러, 프로펠러, 시간평균속도, 추력 및 토오크 계수

Abstract

In this paper a Vortex Lattice Method is used to predict the performances of a contra-Rotating Propeller. Greeley and Kerwin's(1982) wake model is adopted instead of the exact trailing vortex geometry. The interaction of the two propellers is treated by the sense that the induction of one propeller upon the other propeller is averaged in the circumferential direction . Two single propellers (DTRC 4119 & DTRC 4842) are chosen and compared with the experimental and other numerical results published. Then the computational results for three CRP's (4-0-4 CRP(DTRC 3686+DTRC 3687A) 4-0-5 CRP(DTRC 3686+DTRC 3849) & DTRC CRT(DTRC 5067+DTRC 5068) are compared with the experimental and numerical results published. The interaction of both propellers by the change of inflow velocity and circulation of each propeller is investigated.