Abstract
Due to the higher propulsive efficiency, lesser vibration, and better maneuverability, the water jet pump is widely applied to high-speed underwater vehicles. By taking a newly developed water jet pump system as the object, the corresponding underwater vehicle’s operating characteristics affected by different cruising speeds (15.43, 30.86, and 52.47 m/s) were investigated. The steady results reply that the cruising speed increase will result in the decline of the overall performances comprised of the head, the efficiency, the thrust, and the power. While, by using different analyzing methods, the unsteady results are listed as follows: (1) The energy loss theory denotes that the increasing cruising speed promoted the kinetic energy diffusion from the Reynolds stress and viscous stress and depress the turbulent kinetic energy production and the viscous dissipation. (2) The statistical PLS method reveals that the tip load effect on the leakage flow becomes weaker when the cruising speed becomes larger, while the effect from the scraping pressure has a completely opposite trend. (3) Further unsteady analysis implies that the increasing cruising speed makes the pressure pulsation larger and makes the radial force, the axial force, and the cloudy cavity size smaller.
Highlights
The waterjet pump has been widely applied to high-speed ferries and military amphibian vehicles due to its higher propulsive efficiency, lesser vibration, and better maneuverability [1]
Since the near-wall treatment is important for the turbulence model, Figure 3 presents the Yplus distribution on the impeller and the vane, and the largest value of Yplus is lower than 110, which satisfies the basic standard of using the turbulence model (SST k-ω) [8]
Since the water jet pump of this study belongs to the high-speed pump, which exists inevitable cavitating phenomenon, accompanied by the phase change of the thermodynamics and kinetics, the characteristics of cavitation influenced by the cruising speed are clarified
Summary
The waterjet pump has been widely applied to high-speed ferries and military amphibian vehicles due to its higher propulsive efficiency, lesser vibration, and better maneuverability [1]. Along with the water jet pump, has a much higher cruising speed, it is difficult to directly evaluate the water jet propulsion performance in the towing tank. [8,9,15], the validated numerical approach is still taken as the tool to evaluate the performance of the underwater vehicle with a high-speed water jet pump system. The rotating speed of the pump system is rather low in related studies, while the flow mechanism analysis with the high-speed water jet propulsion pump is urgent. The study here is mainly organized as follows: Part 2 illustrates the numerical approach, including the boundary condition and the turbulence model; Part 3 analyzes the operating characteristics of the underwater vehicle with a newly developed high-speed waterjet pump under different cruising speeds; Part 4 provides conclusions
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