1 / 14

Enhancing Ship Hydrodynamic Efficiency with Bulbous Bow and Micro Bubbles

This research aims to improve hydrodynamic efficiency through the application of a bulbous bow and micro bubbles. The study examines drag reduction and flow control methods for ships, using active and passive techniques. By testing different variations on a model ship, the impact of bulbous bow attachment and micro bubbles injection on drag force is analyzed. The study evaluates the influence of bulb diameter and length as well as micro bubble size on total resistance, aiming to enhance ship performance.

mabyn
Télécharger la présentation

Enhancing Ship Hydrodynamic Efficiency with Bulbous Bow and Micro Bubbles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Improving Hydrodynamic Efficiency through the Application of a Bulbous Bow and Micro Bubbles Harrison DiGia Advanced Science Research Period 7

  2. Need World Carbon Dioxide Emissions by Region,2003-2030 (Billion Metric Tons of Carbon Dioxide) • 90% of all goods that were sent around the globe went by ship (Kodama, 2006) • 843 million tons of CO2 were released by international shipping in 2007 http://www.eia.doe.gov/bookshelf/brochures/greenhouse/Chapter1.htm

  3. Bulbous Bow • Protrudes just below the waterline • Reduces shock wave • Ideal for large ships http://www.globalsecurity.org/military/systems/ship/images/bulbous-bow-image08.jpg

  4. Micro-Bubbles http://www.newscientist.com/data/images/archive/2539/25391601.jpg

  5. Literature Review • McCormick and Bhattchara (1973)- injected micro-bubbles into turbulent boundary layer

  6. Literature Review • Takahashi (2000)- determined that micro-bubble placement is essential

  7. Literature Review • Shen et al. (2006)- determined that micro-bubble size plays an important role in drag reduction

  8. Literature Review • Kyriazis (1988)- tested different variations of a bulbous bow Effect of Bulb Diameter (D) on Total Resistance Effect of Bulb Length (L) on Total Resistance

  9. Engineering Goals Examine: • Changes in drag force caused by the application of a bulbous bow • Changes in drag force caused by the insertion of microbubbles • Improve hydrodynamic efficiency by using methods of passive and active flow control Purpose

  10. Methodology Improving Hydrodynamic Efficiency Through Methods of Active and Passive Flow Control Normal Ship n=5 Attach Bulbous Bow n=1 Inject Micro-Bubbles in Water (200-400 micrometers) n=1 Attach Bulbous Bow and Inject Micro-Bubbles n=1 Inject Micro-Bubbles in 20 ppm Triton-X (200-400 micrometers) n=1 Attach Ship to Ship Drag Measurement Calculator Record mass and acceleration to calculate the drag force Analyze force data using ANOVA (p<.05) followed by a Scheffe Post Hoc Test

  11. Ship Drag Measurement Calculator Pasco Photogate and Pulley- Measures Acceleration Mass Bulbous Bow Porous Plate Force= Mass(Acceleration) Top View

  12. Budget

  13. Do-ability • Water tunnel in lab • Boat is already made • Micro-bubbles can be created using a simple aquarium bubbler • Bulbous bow can easily be inserted into front of model ship

  14. Bibliography

More Related