Accession Number : ADA189175

Title :   Propeller Design for Naval Auxiliary AO-177 Jumbo.

Descriptive Note : Final rept. Jul 86-Apr 87,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP H YDROMECHANICS DEPT

Personal Author(s) : Kim, Ki-Han

PDF Url : ADA189175

Report Date : Sep 1987

Pagination or Media Count : 99

Abstract : The design of a fixed-pitch propeller for the U.S. Navy's auxilliary oiler, AO-177 JUMBO is presented. The jumboized AO-177 represents the AO-177 class with a 108 foot parallel-midbody section inserted. The design process is discussed in detail including considerations of cavitation and propeller-excited vibratory forces. The objective was to design a propeller which provides an increased thrust and improved cavitation performance compared to the existing propeller. The speed at full power (24,000 shp) was predicted to be 20.81 knots. The sustained speed was predicted to be met at 5 percent less than design sustained power. The thrust breakdown criteria of 10 percent speed margin on back bubble cavitation at full power was calculated to be met. Calculations predicted that, at full-power design condition. The final 5-bladed propeller with diameter of 21.0 feet will produce unsteady thrust and torque of 2.5 and 1.8 percent of the design thrust and torque, respectively. At full power design conditions, stresses throughout the blades are calculated to be well below the allowable limit of 12,500 psi.

Descriptors :   *MARINE PROPELLERS, BUBBLES, CAVITATION, POWER, PROPELLERS, STRESSES, TORQUE, VELOCITY, TANKER SHIPS, NAVAL VESSELS(SUPPORT)

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE