Abstract
The linear jet propulsion system, unlike pump-jets which are widely used in underwater bodies, is installed inside a tunnel under the vessel and can be used for high-speed crafts, tugs, and service boats. However, this system has not received adequate attention by researchers, which is the subject of the current study. In the present paper, hydrodynamic performance of the linear jet propulsion system is numerically investigated. Accordingly, the Ansys-CFX software is utilized and RANS equations are solved using the SST turbulent model. The results of the proposed numerical model, in the form of thrust and torque coefficient as well as efficiency, are compared with available experimental data for a ducted propeller, and good compliance is achieved. Considering the importance of stator cross section on the performance of the linear jet propulsion system, the influence of thickness and camber size of the stator on linear jet propulsion systems are examined. Based on the numerical findings, it is determined that at constant advance ratio, with increasing thickness of stator, the efficiency increases. It is also observed that as the span length increases, the maximum and minimum of the pressure coefficient increase for different thicknesses. Furthermore, it is seen that positive and negative pressure coefficients decrease with an increase in foil thickness.
Highlights
One of the main components in a vessel is its propulsion system. e main function of the propulsion system is to produce the thrust required to move the vessel. One type of this system is linear jet propulsion system which is appropriate for a speed range between conventional propellers and water jets
Pump-jets are widely used in underwater bodies, but linear jet is installed inside a tunnel under the vessel and it can be used for high speed crafts, tugs, and service boats
The hydrodynamic performance of pump-jet propulsor is based on the Reynolds Averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) method using structured grid; Stress Transport (SST) k-ω turbulence model was determined by Pan et al [14, 15] and Lu et al [16]
Summary
One of the main components in a vessel is its propulsion system. e main function of the propulsion system is to produce the thrust required to move the vessel. E main function of the propulsion system is to produce the thrust required to move the vessel One type of this system is linear jet propulsion system which is appropriate for a speed range between conventional propellers and water jets. The torque needed to move the rotor was assessed Based on their tests, it was observed that propulsion system of the pump-jet has a wider range of performance than the ducted propeller. In the present study, considering the importance of stator cross section on the performance of the linear jet propulsion system and the lack of any data in the field of linear jet propulsion system, the effect of thickness and camber size of the stator on linear jet propulsion system are examined To accomplish this task, ANSYS-CFX software is used to perform numerical simulations. The effects of thickness and camber size of the stator on pressure coefficient around the stator are assessed
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