A waterjet propulsion system has many advantages over a conventional screw propeller system in amphibious military vehicles. These advantages include good maneuverability at low speeds, operability in shallow waters, high thrust at low speeds to aid maneuverability and water exit. A flush type waterjet propulsion unit (duct, impeller, stator, and nozzle) was designed for an amphibious tracked vehicle that can cross rivers or lakes using a twin waterjet propulsion system. Due to its compactness and weight, primary considerations in military tracked vehicles, axial flow waterjets are usually used in spite of their relatively low speed. Impeller diameter is a specific parameter for determining the size of a waterjet, and it is related to weight. The weight and compactness of propulsion system are important factors in amphibious military vehicles because of their effect on buoyancy. In terms of buoyancy, a smaller diameter is expected to be better, while in terms of performance, a large diameter is expected to be better. In the present study, the performance of waterjet systems using different impeller diameters was investigated in order to determine the optimum waterjet for a 250 hp amphibious tracked vehicle. The RANS (Reynolds Averaged Navier Stoke) equations were solved using a moving, non-orthogonal multiblocked grid system. The momentum flux approach and the ITTC 96 (International Towing Tank Conference) standard method, which have been used worldwide for the analysis of waterjet performance analysis, were used in the experiments. This paper emphasizes the performance of waterjets by impeller diameter size.
Comparison of waterjet performance in tracked vehicles by impeller diameter
Vergleich der Wasserstrahlantriebsleistung in militärischen Ketten-Amphibienfahrzeugen in Abhängigkeit vom Impellerdurchmesser
Ocean Engineering ; 36 , 17-18 ; 1438-1445
2009
8 Seiten, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
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