Accession Number : ADA255143


Title :   An Evaluation of Propulsors for Several Navy Ships


Descriptive Note : Master's thesis


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE


Personal Author(s) : Hugel, Mark A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255143.pdf


Report Date : Jun 1992


Pagination or Media Count : 140


Abstract : A project was undertaken to develop a relatively simple computer program which models the performance, weight, volume and cost of various combinations of propulsion plant components for three different naval ship types. Within that computer program, the types of propulsors from which the user may select include fixed pitch propellers, controllable reversible pitch propellers, contrarotating propellers, propeller/preswirl vane combinations, and waterjets. The propeller choices include both ducted and non-ducted configurations. To model these propulsors in a computer program, routines were developed to select the correct propulsor geometry to transmit developed horsepower to the water, and to predict the off-design performance, weight and (if applicable) volume of the propulsors chosen. Propeller geometry design and off-design performance for the propeller variants were characterized using the Propeller Lifting Line computer program developed at MIT. Waterjet performance was predicted using information obtained for KaMeWa waterjets. Correlations describing optimum propeller geometry versus thrust coefficient, propulsor performance versus ship speed, propulsor weights and volumes were developed for the different ship types. These correlations are invoked within the propulsor modelling routines in the program, thereby allowing the propulsors to be matched with various engine and transmission combinations. The computer program logic is outlined which is used to match the size and performance of the chosen propulsion components with a hull sized to envelope the propulsion plant and a fixed payload.


Descriptors :   *COMPUTER PROGRAMS , *MARINE PROPELLERS , VELOCITY , VOLUME , SHIPS , PAYLOAD , MODELS , COMPUTERS , WATER , COMPARISON , DISPLACEMENT , COSTS , CORRELATION , COEFFICIENTS , CONFIGURATIONS , REVERSIBLE , WEIGHT , ENGINES , GEOMETRY , LOGIC , SELECTION , THRUST , MITES , HORSEPOWER , PROPELLERS , DESTROYERS , AMPHIBIOUS SHIPS


Subject Categories : Computer Programming and Software
      Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE