Water-Jet Propulsion for High-Speed Hydrofoil Craft

1966 ◽  
Vol 3 (2) ◽  
pp. 174-179 ◽  
Author(s):  
VIRGIL E. JOHNSON
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Jet Propulsion

Analysis of Local Vibration and Strength of Water Jet Propulsion Unit of High Speed Ship

2018 ◽  
Author(s):  
Xin Zhang ◽  
Huilong Ren ◽  
Guoqing Feng ◽  
Yifu Liu ◽  
Zhaonian Wu
Keyword(s):  
High Speed ◽  
Element Model ◽  
Lateral Force ◽  
Water Jet ◽  
Local Vibration ◽  
Jet Propulsion ◽  
Vibration Problem ◽  
Local Strength ◽  
Blade Frequency ◽  
Propulsion Unit

In recent years, water jet propulsion unit has been widely used in the field of high speed ship. Compared with traditional propeller, water jet propulsion unit has excellent maneuverability with high speed, and lateral force generated by water jet propulsion unit can reduce the radius of turning. High speed ship with water jet propulsion has higher efficiency, lower noise. However, water jet propulsion unit needs to be opened in stern transom plate, and it causes the water jet force when ship is operating, all of these will affect the local strength of stern. It remains to be researched whether the vibration generated by water jet excitation force has a significant influence. These problems are designers worried about. To solve these problems, this paper builds the finite element model of stern contains water jet propulsion unit, considering hull deck load, broadside load, bottom load, bulkhead load and water jet load, checking the local strength of stern. Analysis of vibration problem, considering the influence of added mass of entrained water, dividing stern into deck, bottom, water jet propulsion unit, stern transom plate and other local structure, calculating natural frequencies of plate, panel and grillage of each local structures. Comparing the results with shaft frequency and blade frequency, checking the reserve frequency, judging whether water jet propulsion unit on vibration problem meets standards, providing reference for the following hull design.

scholarly journals Utilization of Open-Source OpenFOAM Code to Examine the Hydrodynamic Characteristics of a Linear Jet Propulsion System with or without Stator in Bollard Pull Condition

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Parviz Ghadimi ◽  
Negin Donyavizadeh ◽  
Pouria Taghikhani
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Propulsion System ◽  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Propulsion Systems ◽  
Thrust Coefficient ◽  
Jet Propulsion ◽  
Marine Industry ◽  
Total Thrust

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.

Radiated Sound of a High-Speed Water-Jet-Propelled Transportation Vessel

2016 ◽  
pp. 951-956
Author(s):  
Alexis B. Rudd ◽  
Michael F. Richlen ◽  
Alison K. Stimpert ◽  
Whitlow W. L. Au
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Radiated Sound

High-speed singulation of electronic packages using a frequency-doubled Nd:YAG laser in a water jet and realization of a 200-W green laser

2003 ◽  
Author(s):  
Frank R. Wagner ◽  
Wentao Hu ◽  
Akos Spiegel ◽  
Nandor Vago ◽  
Bernold Richerzhagen
Keyword(s):  
Nd:Yag Laser ◽  
High Speed ◽  
Green Laser ◽  
Water Jet ◽  
Electronic Packages
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