Flapping Foil Propulsion System in Ship and Underwater Vehicles

Slide 1

FLAPPING FOIL PROPULSION SYSTEM FOR SHIPS AND UNDERWATER VEHICLESSharat MathewReg. No. 12020019

Presented By:-

AbstractFrom ancient time onwards, humans have been depending on marine propulsion systems for various purposes. As time advanced marine propulsion systems have also undergone various advancements. In present scenario, we have a number of marine propulsion systems such as diesel and gas turbine propulsion systems. The major disadvantages in common to all these propulsion systems are variable and low efficiencies and less eco-friendly. This presentation deals with the use of flapping foil propulsion system in ships and underwater vehicles. Flapping foil is a highly flexible polyurethane structure which mimics the propulsion modes of living beings which are supposed to be more efficient and nature blending. It is found that flapping foil propulsion systems helps in increasing the efficiency and proves to be eco-friendly.

Keywords : Marine Propulsion, Ship, Underwater Vehicle, Flapping Foil.

#Saturday, 10 October 2015

ContentsIntroductionPrinciple of Marine PropulsionDifferent types of Propulsion SystemsThere Common DisadvantagesWhy Flapping Foil?What is Flapping Foil?Flapping Foil in ShipsFlapping Foil in UWV ConclusionReferences


IntroductionMarine Propulsion systems fall into three categories i. Human Propulsion ii. Sailing iii. Mechanical PropulsionIn this, Human propulsion and Sailing systems were dominant form of propulsion until the 19th century.Mechanical propulsion systems generally consist of a motor or engine turning a propeller or an impeller or wave propulsion fins.Due to there certain disadvantages new modes of propulsion systems where needed to be used.


4

Principle of Marine PropulsionA ship moves through the water using propelling devices , such as paddle wheels or propellers. These devices impart velocity to a column of water and moves it in the opposite direction in which it is desired to move the ship. A force, called reactive force because it reacts to the force of the column of water, is developed against the velocity-imparting device. This force, also called thrust, is transmitted to the ship and causes the ship to move through the water.


Principle of Marine Propulsion


Different types of Propulsion SystemsDiesel propulsion systemWind propulsion systemNuclear propulsion systemGas turbine propulsion systemFuel cell propulsion systemBiodiesel fuel propulsion systemSolar propulsion systemSteam turbine propulsion systemDiesel electric propulsion systemWater jet propulsion systemGas fuel or tri fuel propulsion system


Diesel Propulsion SystemDiesel propulsion systemis the most commonly used marine propulsion system converting mechanical energy from thermal forces.


Gas Turbine Propulsion SystemGas turbine propulsion is used for naval as well as non-naval ships. In case ofnaval ships, the gas turbine propulsion system aids in faster movement of the ships which is necessary in case of the ship coming under attack.


Common DisadvantagesVariable and Low efficiency- Thermal efficiencies are lower for similar power and varies with ambient temp.aLess Eco Friendly- Various harmful emissions such as CO, NOX, SOX, volatile organic compounds and particulate matter.Underwater Noise and Unwanted Vibration.Some sources are not reliable at all time - Wind and Solar.


Why Flapping Foil?In order to make the ship more efficient and eco-friendly.The propulsive systems of living beings are expected to be the most efficient and nature blending.Flaps are made flexible which enable it to have a variable angle of movement.Combined flapping and undulation mode propulsion systems for underwater vehicles have advantages such as ecologically pure, and higher efficiency.


What is Flapping Foil?It is a structure made of polymer.It is highly flexible.Commonly made of polyurethane.Flexible flaps are chosen because they are found to be more efficient than rigid one.The concept of this have been came from movement of the fish.They are having more durability.


Flapping Foil in ShipsFlapping Foil 2D Stimulation..


Flapping Foil in ShipsMechanism..


Flapping Foil in ShipsFlapping Foil during the two strokes..


Flapping Foil in Ships


Flapping Foil in ShipsAdvantages..Lower underwater noise.Better maneuverability at low ship speeds.Higher efficiency.


Flapping Foil in Under Water VehicleFlapping foil uwv contains 4 foils one pair at the bow and another at the stern.The foils are driven by separate actuators ,196w and a 15w dc brush motor. The vehicle is connected to a LAN, there by controlled from the surface.


Flapping Foil in Under Water VehicleTwo views of flapping foils UWV

TOP VIEWSIDE VIEW


Flapping Foil in Under Water Vehicle


Flapping Foil in Under Water VehicleAdvantages..Good scalability and flexibility.Can be operated at dynamic environment.High maneuverability.Easily controlled.


ConclusionSo it can be concluded that Flapping foil in ship and underwater are more eco friendly.It can also increase the propulsive efficiency by more than 40%.Further improvement in design in flapping foils and mechanism could increase the efficiency and speed in ships as well as in UWV.


ReferencesOscillating foils for ship propulsion J. Mattheijssens 1, J.-P. Marcel1, W. Bosschaerts1, D. Lefeber2 1Royal Military Academy, Department MECA Renaissancelaan 30-1050 Brussel 2Vrije Universiteit Brussel, Robotics and Multibody Mechanics Group Pleinlaan 2-1050 Brussel, 2012Design and Projected Performance of a Flapping Foil AUV StephenLicht,VictorPolidoro,MelissaFlores,FranzS.Hover,AssociateMember,IEEE,andMichaelS.Triantafyllou, 2004Hydrodynamics of fishlike swimming, Triantafyllou,M.S, Triantafyllou,G.S.,Yue,D.K.P.,2000, An. Review Fluid Mech. 32.Marine propulsion in waves by flapping-foil systems Kostas A. Belibassakis, School of Naval Architecture and Marine Engineering National Technical University of Athens Heroon Polytechniou 9, Zografos 15773, Athens, 2015Maneuvering Hydrodynamics of Fish and Small Underwater Vehicles,1 Promode R. Bandyopadhyay2 Propulsion, Hydrodynamics and Silencing Division, Naval Undersea Warfare Center, Newport, Rhode Island 02841, 2002 Different types of marine propulsion systems- Wikipedia


THANKS TO EVERYONE.
