Abstract
With the development of high-speed crafts, new propulsion systems are introduced into the marine industry. One of the new propulsion systems is linear jet which is similar to pump jet and has a rotor, a stator, and a duct. The main difference between this system and pump jet is the placement of linear jet system under the hull body and inside a tunnel. Since this system, like a water jet, is inside the tunnel, the design idea of this system is a combination of a water jet and pump jet. In this paper, hydrodynamic performance of linear jet propulsion system is numerically investigated. To this end, the OpenFOAM software is utilized and RANS steady equations are solved using a k - ε turbulent model. The linear jet geometry is produced by assembling a Kaplan rotor, stator with a NACA 5505 cross section, and a decelerating duct. The results of numerical solution in the form of thrust, torque coefficient, and efficiency are compared with available experimental data for a ducted propeller, and good agreement is displayed. Subsequently, the hydrodynamic parameters are computed in two conditions: with a stator and without a stator. By comparing the results, it is observed that the total thrust coefficient of the propulsion system with a stator at all advance ratios increases by at least 40%. It is further observed that addition of a stator also improves its efficiency.
Highlights
Linear jet propulsion system is one of the new propulsion systems in the marine industry
To investigate the effects of the presence of a stator on the performance of a linear jet propulsion system, the linear jet system is generated with the following characteristics
The hydrodynamic characteristics of a ducted propeller including thrust coefficient and torque coefficients compared with available experimental data and good accordance are achieved
Summary
Linear jet propulsion system is one of the new propulsion systems in the marine industry. Considering the long history of the use of ducted propellers in varieties of boats and ships, different experimental and numerical works have been conducted in this regard. One of these works is the experiment performed by Oosterveld [3] on a propeller of ka 4-70 with a duct of 19A. Taketani et al [4] placed a Kaplan propeller series inside a 19A duct and examined the flow around the propeller. Their results showed a higher bollard pull performance than the conventional propeller. Yongle et al [7] examined
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