PERFORMANCE ESTIMATES OF CAPTURED AIR BUBBLE VEHICLES WITH WATER JET PROPULSION

1967 ◽  
Author(s):  
Robert M. Williams
Keyword(s):  
Water Jet ◽  
Jet Propulsion ◽  
Air Bubble ◽  
Performance Estimates

scholarly journals Broken lines path following algorithm for a water-jet propulsion USV with disturbance uncertainties

2020 ◽  
Vol 201 ◽  
pp. 107118 ◽  
Author(s):  
Yujiao Zhao ◽  
Xin Qi ◽  
Atilla Incecik ◽  
Yong Ma ◽  
Zhixiong Li
Keyword(s):  
Path Following ◽  
Water Jet ◽  
Jet Propulsion ◽  
Disturbance Uncertainties ◽  
Path Following Algorithm

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

The Design of Water-Jet Propulsion Systems for Hydrofoil Craft

1965 ◽  
Vol 2 (01) ◽  
pp. 15-25
Author(s):  
Joseph Levy
Keyword(s):  
Water Jet ◽  
Propulsion System ◽  
Specific Design ◽  
Propulsion Systems ◽  
Propulsive Efficiency ◽  
Jet Propulsion ◽  
Performance Curves

This paper contains a brief description of the water-jet propulsion system as applied to hydrofoil craft, and a discussion of the salient hydrodynamic aspects of the problem of fitting the main propulsion system to the specified thrust-versus-speed requirements. The factors that affect the overall propulsive efficiency and the weight of the system are discussed at some length; procedures for optimization of performance at the design cruising speed are outlined; finally, the processes by which the performance at off-design conditions may be evaluated are discussed and illustrated with performance curves for one specific design.

Research on the thrust of a high-pressure water jet propulsion system

2017 ◽  
Vol 13 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Zuti Zhang ◽  
Shuping Cao ◽  
Xiaohui Luo ◽  
Weijie Shi ◽  
Yuquan Zhu
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Propulsion System ◽  
Jet Propulsion ◽  
Pressure Water ◽  
High Pressure Water Jet

scholarly journals Increase of durability of an amphibious vehicle water jet propulsion drive

2020 ◽  
Vol 709 ◽  
pp. 033036
Author(s):  
Pavel Nenashev ◽  
Sergey Abdulov ◽  
Alexander Taratorkin
Keyword(s):  
Water Jet ◽  
Jet Propulsion

Multi-Objective Hydraulic Optimization on Intake Duct of Water-Jet Propulsion Using NSGA-II

2019 ◽  
Author(s):  
Rui Zhu ◽  
Puyu Cao ◽  
Yang Wang ◽  
Chao Ning
Keyword(s):  
Pareto Front ◽  
Water Jet ◽  
Outlet Section ◽  
Characteristic Parameters ◽  
Upper Lip ◽  
Nsga Ii ◽  
Lower Lip ◽  
Trade Off ◽  
Jet Propulsion ◽  
Multi Objective

Abstract Flow distortions occur at the outlet section of the intake duct owing to its shape properties, which is a component of water-jet propulsion. Since the noticeable influence of intake’s flow characteristics upon propulsive efficiency, it’s necessary to focus on intake duct redesign. In this paper, a systematic methodology for reducing flow distortions and power losses within the intake duct through a shape optimization process was obtained. In addition, the mechanism of flow distortions was also developed. The flush type inlet applied in the marine vessel with the speed of 30 knots was chosen as research project. Four characteristic parameters were set as optimization variables depending on the geometrical relationship of thirteen characteristic parameters referred to the duct longitudinal midsection, which were the ramp angle α, the radius of the upper lip R3, the radius of the lower lip R4 and the lip height h respectively. Subsequently, a sample space was built by Latin Hypercube Sampling (LHS) and the parameters were normalized in the range of 0 to 1. With the commercial software CFX, the numerical simulation was accomplished driven by SST k-ω turbulence model. Multi-objective optimization based on the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) was utilized to minimize the non-uniformity at outlet section and maximize the minimal pressure at lip simultaneously. Moreover, the Radial Basis Function (RBF) neural network was employed to approximate the functional relationship between variables and objectives, which could be applied in the NSGA-II to get the Pareto Front. The minimum non-uniformity point and the trade-off point (The point both satisfies the minimum non-uniformity and the maximum minimal pressure at lip strategically) were selected from the Pareto Front. With regard to the characteristic parameters of the trade-off point, the ramp angle, the radius of the upper lip, the radius of the lower lip and the lip height are 31.91°, 11.42 mm, 400.97 mm and 55.43 mm respectively. Meanwhile, the characteristic parameters of the minimum non-uniformity point are 30.22°, 25.59 mm, 166.65 mm and 89.90 mm respectively. Ultimately, the duct outflow characteristics of prototype and optimization are compared. In terms of the trade-off point, the minimal pressure at lip increases 66.40% to −24488.93 Pa and the non-uniformity has a drop of 4.56% to 0.1571. The non-uniformity of the minimum point is 0.1481 which is reduced by 10.02%. Through the optimization of duct shape, the secondary flow (Dean vortices) is suppressed effectively. This paper is expected to provide a better comprehension of the flow field within the intake duct of water-jet propulsion.

scholarly journals Dynamic loading of a water jet propulsion drive of amphibious vehicles

2018 ◽  
Vol 224 ◽  
pp. 02042 ◽  
Author(s):  
Sergey Abdulov ◽  
Alexander Taratorkin ◽  
Pavel Nenashev
Keyword(s):  
Dynamic Loading ◽  
Water Jet ◽  
Jet Propulsion ◽  
Parametric Oscillations

The analysis results of dynamic loading of the amphibious vehicle’ water jet drive are presented, the hypothesis about the durability limitation of the drive due to the onset of resonance forced and parametric oscillations is advanced. Solutions of that problem are justified.

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