Dynamically Optimized Team Performance

An innovative program is proposed to exploit the dramatic drag reduction potential of microbubble layers on high-speed undersea vehicles. Under the turbulent flow conditions experienced by torpedoes, microbubble drag reduction is capable of providing themaximum friction drag benefit. Previous research has revealed that 80% of the skin friction drag can be eliminated through the introduction of small bubbles into the boundary layer surrounding the vehicle, but the application of the technology has notbeen vigorously pursued. The focus of this effort is to obtain extreme drag reduction levels by controlling the bubble characteristics and emphasizing techniques for high-speed vehicles. Three methods will be investigated experimentally: porous surfacegas flow, water electrolysis and chemical gas bubble generation. All are capable of achieving high drag reduction levels, but the compatibility of each technique with the vehicle power system and weight/volume constraints will be carefully evaluated usingan engineering model accounting for energy costs and system efficiencies. In the Phase I effort, experiments will be undertaken to establish the maximum drag reduction levels that can be achieved using controlled microbubble layers. The technique(s)providing the optimum performance and power system compatibility will be evaluated in large-scale experiments conducted in Phase II.The microbubble drag reduction technology is applicable for all marine vehicles. Commercial applications includesupertankers, cruise ships, freighters, ferries and private power boats. Navy applications are high-speed torpedoes, AUVs/UUVs, submarines and surface combatants.