... as a promising source of feedstock for biofuels and chemicals. It is particularly attractive because of the efficiency of these marine plants in converting sunlight into biomass and because this type of farming can be done without the risk of displacing land and freshwater from their essential role in feeding...

... typically employ the use of waterjet propulsion. The propulsion system must satisfy many criteria, including cavitation avoidance, powering limitations, and maximizing fuel efficiency. These three goals are difficult to meet simultaneously, particularly when the performance of the system over the full...

... Ohmsett - The National Oil Spill Response Research & Renewable Energy Test Facility plays a critical role in developing the most effective response technologies, as well as training first responders with the most realistic training available, enabling a rapid and efficient response...

... systems may work in weathers up to Beaufort 2. They have high cleanup (collection) efficiencies and speeds. If the conditions are such that the oil mixes with seawater by time (emulsion state), the ability to collect oil is reduced dramatically. In the system shown in Figure 1, the rotating disk is made...

... for using the LDV survey to obtain the waterjet performance. static pressure mass flow pressure coefficient momentum flux velocity distribution station 1 efficiency probe head rise ldv survey procedure water tunnel discharge station 7 energy velocity propulsor reynolds number...

... to better hull design for lower resistance, improved propeller inflow, and more efficient propellers. Compared to the traditional design, some podded designs are predicted to reduce the delivered power at the propeller by as much as 20%. The design objectives, design constraints and reasons for improved...

... water management risk and uncertainty assessment uncertainty analysis memorial university shaft propeller thrust coefficient expression rps efficiency coefficient equation reduction calibration luznik use torque coefficient nm 0 USE OF UNCERTAINTY ANALYSIS FOR REDUCTION...

... hydraulic jet pump cavitation waterjet propulsion figure 4 figure 2 cavitation inception inlet cavitation tunnel semi-flush inlet geometry stricker multiphase pump npsh inlet efficiency cavitate diameter thrust artificial lift system efficiency ingestion figure 1 model...

... efficiently in the neighborhoods of specific wave periods. In random seas, the operational ranges of each are within the half-power bandwidth of the center band resonant periods. The BBDB is an oscillating water column system in which a horizontal column of water, with its mouth facing aft and its internal...

... theoretically that net steady thrust, or drag, can result from nonlinear filtering in the products of unsteady body surface displacement and pressure distributions involved in the force itegrals. The efficiency of such propulsion is necessarily 100 percent since no losses occur in an inviscid fluid. Further...

... span asymmetric stator are designed which increase propul­ sive efficiency relative to an existing propeller. Model test results are provided which show that significant flow smoothing is achieved across the entire span of the pro­ peller. The. model tests show that the predicted increase in propulsive...

... inception surface ship propeller cavitation performance improvement cavitation separation geometry procedure efficiency propeller coefficient loading propeller 4990 naval surface warfare center propeller geometry propeller 5133 Improvement of Surface Ship Propeller Cavitation Performance...

... of propulsive performance between open-single and contrarotating (CR) propellers are presented. The predictions indicate that CR propellers will improve propulsive efficiency by about 7 to 9 percent for the three baselines. It is concluded that the 30-knot, twin-skeg ship is the most promising candidate...

... by the action of the propeller. It is reported that the strength of the hub vortex is reduced with this arrangement. The result provides a propeller of higher efficiency. This efficiency gain has been recorded with a relatively large number of ships fitted with this device. The enclosed presents data...

.... Open water results show that the performance predictions agree well with the measurements. aft propeller coefficient cr propeller thrust deduction circulation efficiency application rpt propeller conservation prediction interaction consideration loading propeller diameter hub reed...

... with theoretical results from a linearised mathematical model. High propulsive efficiencies around 0.7 were obtained with this model propeller. In the zero speed condition, the propulsive thrust coefficient (CTb) decreases as the oscillating frequency increases. Investigations were made into the speed of advance...