Crest of the Royal National Institution of Naval Architects - Click to return to the homepage

The Royal Institute of Naval Architects

Alfa-Laval July

Man Energy Hybrid

Air Products June 2019

IJME 516

Paper Title: Static Control of Drag-Reducing Air Cavities with Variable Cavitator Shape

 

Authors

K I Matveev, Washington State University, USA

Summary  

Air ventilation of submerged surfaces of ship hulls is a promising technique for drag reduction. To ensure high performance of air cavities in a broad range of operational conditions, the cavity properties can be controlled with help of compact hydrodynamic actuators. In this study, a potential flow theory is applied to model an air cavity formed behind a wedge-shaped cavitator under a horizontal wall imitating a ship bottom. By varying the wedge angle, it is possible to achieve states with maximum drag reduction at given operational conditions. The dependence of the optimal wedge angle on Froude number and hull trim is investigated. The air-cavity ability to reduce frictional drag is found to increase with rising flow speed and bow-down hull trim.

 

Reference

Transactions RINA, Vol 161, Part A1, International Journal Maritime Engineering, Jan - Mar 2019

DOI Number

DOI No: 10.3940/rina.ijme.2019.a1.516

Search and Order IJME papers

All International Journal of Maritime Engineering (IJME) papers are listed in the RINA Publications Database. You can search the database by author name and paper title. Publications may be ordered and paid for online. Other publications are also listed, some of which may be downloaded free of charge. Follow the link to Search Publications & Order.

SIG SHIPS PROMO

IQPC May

Seatrade informa June

ICCAS II

Wave Energy Scotland

Marintec 2019

Wind propulsion b

AHOY Europort 2019