The Defense Advanced Research Projects Agency (DARPA) Suboff Submarine propelled by the Italian Ship Model Basin (INSEAN) E1619 propeller is extensively used in submarine validation studies. Although there are several numerical studies where the DARPA Suboff submarine is used in combination
with E1619 propeller there are no experimental data available in open literature for the self-propulsion condition. In this article, the self-propulsion characteristics of the DARPA Suboff submarine model with INSEAN E1619 propeller obtained with experimental and numerical methods are presented
and discussed by means of Taylor wake fraction, thrust deduction, hull efficiency, relative rotative efficiency, and propulsive efficiency. To experimentally investigate the submarine form, a self-propulsion experimental setup is designed and manufactured. Resistance and self-propulsion experiments
are conducted in Istanbul Technical University Ata Nutku Ship Model Testing Laboratory. Resistance tests are carried out for three different speeds, and the results show good agreement with the published experimental results. Propulsion tests are conducted by using the load-varying self-propulsion
test method for constant speed and seven different propeller rotation rates. Rotational speed, thrust, and torque forces at self-propulsion point are investigated. For the numerical computations a commercial Computational Fluid Dynamics (CFD) code is used. Propeller open water characteristics
and nondimensional velocities behind the propeller are calculated. Self-propulsion point of the submarine and propeller assembly is also solved numerically and the results are compared with the results obtained from the experiments, and it is seen that especially the propeller rate of revolution
and thrust force are predicted with very good approximation.
Nowadays many Navies have submarines and refer them as the backbone of their Navies. The most important task of diesel-electric submarines, whose primary operational task in history was to intercept / control maritime trade routes, is to collect information without being noticed and to perform surprise operations against underwater, land and air targets when necessary. Submarines can be noticed and lose their invisibility thanks to today's high-tech radar systems when they come to the surface of the water and even when they reach periscope depth to go snorkeling without their hulls rising above the water. The ratio of the time submarines charges their batteries during their cruise to the time the submarines spend under water is called indiscretion rate. Reducing this rate is considered as a measure of the invisibility of submarines. While developing new designs and technologies, reducing this rate is considered as the main design goal. Air-independent propulsion systems, which significantly increase the underwater sailing range of submarines, have lowered the rate of snorkeling time of modern submarines, and the operation area of today's submarine equipped with these systems shifts from brown waters to blue waters. Another important factor in the rate of snorkeling cruising time is the hydrodynamic form and the propulsive efficiency of the submarine. The submarine, which has a more efficient form, will be able to cruise for a longer time with the same speed and same energy capacity underwater and will have a lower indiscretion rate. Nowadays, computational fluid dynamics is used by designers as an effective tool and enables the design of hydrodynamic forms that can drive the submarine more efficiently at desired service speeds and the propellers that will push these forms with both high efficiency and low acoustic trace. In this study, the self-propulsion characteristics of the Joubert BB2 submarine form, which has been frequently preferred in recent years in the studies conducted in the open literature, was calculated with computational fluid dynamics methods and the speed of the propeller used in the propulsion of the submarine was obtained to propel the ship at the service speed of the submarine. With the determination of the self-propulsion point, the Taylor wake fraction, thrust deduction, hull efficiency, relative rotative efficiency and propulsive efficiency were calculated and compared with open literature.
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