Harry Kucharczyk

Need $438 Million spent on annual boating fuel (Lipton 95) 99.8% of goods are transported by ships Carbon Dioxide emissions continue to rise

Knowledge Base Bulbous Bow o Reduces shock wave o Decrease in friction drag

Knowledge Base Micro Bubbles Inserted in the boundary layer Decreased viscosity and density of the fluid

Literature Review McCormick and Bhattchara (73)- injected hydrogen micro bubbles into the turbulent boundary layer Madavan (84)- location and distribution of bubbles are essential Kato (94)- determined reduced skin friction drag by 80% through the use of micro bubbles Kodama (00)- performed experiments in a water tunnel with microbubbles generated in an air injection chamber by injecting air through a porous plate

Engineering Goals Examine the effects of passive and active flow control in boat drag reduction Purpose Reduce skin friction drag by using methods of passive and active flow control

Experimental Setup Porous Plate Bulbous Bow

Experimental Setup weight Accelerator sensor Flow Direction

Experimental Setup (Top View)

Experimental Setup Flow Direction Force Meter

Experimental Setup (Top View) Force Meter

Newton’s Second Law

Do Ability Water Tunnel is accessible in the lab Boat has already been constructed Bulbous bow can easily be inserted into the boat Microbubbles can be made through simple appliances

Budget ItemVendorCategory #SizeQuantityPrice Water TunnelLab BoatLab Porous Plates ICT International 0604D04- B15M1 5 in radius 5 Micro Aquarium BubblerRena in1$4.44 Air InjectorLab Photogate & Pulley SystemPascoME-68381$80.00 Pasport High Resolution Force Sensor PascoPS-21891$ Pasport Acceleration Sensor (2axis) PascoPS-21181$ Total$324.00

Bibliography Culley, Dennis. "Active Flow Control Laboratory." NASA - Active Flow Control. NASA. 29 Feb Donovan, John, and Linda Kral. "Active Flow Control Applied to an Airfoil." American Institute of Aeronautics (1998). Kato, H., Miyanaga, M., Haramoto, Y. & Guin, M. M Frictional drag reduction by injecting bubbly water into turbulent boundary layer. Proc Cavitation and Gas-Liquid Flow in Fluid Machinery and Devices ASME 190, Kodama, Y., Kakugawa, A., Takahashi, T., and Kawashina, H., 1999, “Experimental Study on Microbubbles and Their Applicability to Ships for Skin Friction Reduction”, 1st Int. Symp. on Turbulent Shear Flow Phenomena, Santa Barbara, U.S.A., pp.1-6. Liou, William W. Microfluid mechanics. New York: McGraw-Hill, Lipton, Douglas W., and Scott Miller. "Recreational Boating in Maryland: An Economic Impact Study, " 6 Mar Maryland Marine Trades Conference. Madavan, N.K., Deutsch, S., Merkle C.L., 1984, “Reduction of Turbulent Skin Friction in Microbuubbles”, Phys. Fluids, Vol. 27, pp McCormick, M.E., Bhattacharyya, R., 1973, “Drag Reduction of a Submersible Hull by Electrolysis”, Naval Engineers Journal, Vol.85, No.2, pp Pike, John. "Bulbous Bow." Global Security. 7 Oct Scott, Jeff. "Vortex Generators." Aerospaceweb.org | Reference for Aviation, Space, Design, and Engineering. 14 Jan Washington University in St. Louis (2009, March 18). Engineer Devises Ways To Improve Gas Mileage. ScienceDaily Yoshida, Y., Takahashi, Y., Kato, H., et al. 1998A, “Study on the Mechanism of Resistance Reduction by Means of Micro- Bubble Sheet and on Applicability of the Method to Full-Scale Ship“, 22nd ONR Symp. on Ship Hydrodynamics, pp