C.I.MAR.E.    ST. LAWRENCE BRANCH INVITES YOU TO JOIN THEM FOR AN INFORMATIVE WEBINAR

DATE: TUESDAY, March 9th

TIME: 12:00 pm EST (9:00 am PACIFIC, 1:00 pm ATLANTIC, 1:30 pm NFLD)

Impact of Manufacturing Tolerances on Propeller Performance

Background:

Anthropogenic underwater radiated noise is now being recognized as a worldwide problem. For ship speeds greater than about 15 knots, propeller cavitation is the predominant source of propeller-generated underwater noise and vibrations.  Cavitation not only influences propeller-induced pressure fluctuations on ship hulls and increases noise levels in ships, but it also impacts the ocean environment with
underwater noise pollution. Many studies are investigating the effects of propeller design parameters on propeller performance and cavitation. However, there is a critical gap in understanding the impact of manufacturing tolerances on propeller cavitation and to some extent on propulsive performance. This project addresses that gap in knowledge. The primary tools in the investigation is Computational Fluid Dynamics (CFD) methods supported by model experiments to validate their results.

Project Overview:

The project compares “as-built” propeller blade sections with their ideal “asdesigned” counterpart to elucidate the effects of manufacturing defects on cavitation and propulsive performance. The study is investigating the effect of  sharp-edged flat regions near the LE, which are within the tolerances of ISO 484 class S. The project work is organised in three investigations incorporating both CFD simulations and experimental support as follows:

  • Investigation 1: 2D foil section investigation in rectilinear flow
  • Investigation 2: 3D wing planform investigation in rectilinear flow
  • Investigation 3: 3D full propeller (rotating)

Partners:

  1. Dominis Engineering: Project lead, managing experimental program manufacturing of models and reporting
  2. Memorial University (MUN): CFD modelling
  3. DRDC – Atlantic: CFD modelling

The presenter:

Bodo Gospodnetic, Owner of Dominis

Bodo Gospodnetic is a Professional Engineer and Technical Manager with a wide range of experiences in manufacturing and scientific applications. Mr. Gospodnetic is a graduate of Carleton University’s Electrical Engineering Program. In 1985 he founded Dominis Engineering Ltd. with his father, late Dr. Drasko Gospodnetic, Researcher Emeritus of NRC of Canada. Prior to Dominis Engineering he worked on computer applications in the fields of computer communications, radar modelling and image processing. At Dominis Engineering Ltd., Mr Gospodnetic has been involved in the development of new manufacturing processes and CAD/CAM applications for the machining and measurement of propellers and water jet impellers. In 2015, he initiated a research project to determine the impact of manufacturing tolerances on propulsive, cavitation and noise performance of propellers. This is a collaborative research project between Dominis Engineering, DRDC-Atlantic and Memorial University sponsored by Transport Canada Innovation Centre.