Comparison of Hydrodynamic Performance of Ducted Propeller and Ordinary Propeller on Trawler

2014 ◽  
Vol 908 ◽  
pp. 249-255
Author(s):  
Chao Li ◽  
Zhi Xin Chen
Keyword(s):  
Numerical Calculation ◽  
Pressure Distribution ◽  
Open Water ◽  
Experimental Results ◽  
Hydrodynamic Performance ◽  
Ducted Propeller ◽  
Thrust And Torque ◽  
Good Agreement

With the 42m trawler as object, an ordinary propeller and a ducted propeller are designed and their open water hydrodynamic performance are simulated by using CFD software. The computed results and experimental results of ducted propeller are in good agreement, which verified the reliability of numerical calculation. Then the computed results of ordinary propeller and ducted propeller are compared with each other, it is found that the thrust and torque of ducted propeller is bigger than ordinary propeller in trawling. This article also discusses the pressure distribution of their blade and the reason why ducted propeller has a better hydrodynamic performance is studied.

Unsteady Hydrodynamic Performance Prediction of Ducted Propeller Based on CFD

2013 ◽  
Vol 437 ◽  
pp. 32-35
Author(s):  
Li Jian Ou ◽  
Nan Huo Wu ◽  
De Yu Li
Keyword(s):  
Performance Prediction ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Moving Mesh Method ◽  
Ducted Propeller ◽  
Mesh Method ◽  
Bearing Force ◽  
Thrust And Torque ◽  
Wake Fields ◽  
Calculated Model

Firstly, the calculated model was created in UG and GAMBIT, and then the Moving Mesh method was adopted to simulate thrust and torque of ducted propeller using FLUENT in the open water. The thrust, torque and bearing force of ducted propeller in three different wake fields were calculated. And the influence on the performance of ducted propeller by the wake fields was analyzed.

Four Quadrants Numerical Prediction for Hydrodynamic Performance of Open-Water Propeller

2010 ◽  
Vol 143-144 ◽  
pp. 1143-1147
Author(s):  
Bing Xiao ◽  
Xiao Wang ◽  
Ai Guo Shi ◽  
Ming Wu
Keyword(s):  
Three Dimensional ◽  
Open Water ◽  
Mathematic Model ◽  
Hydrodynamic Performance ◽  
Computational Domain ◽  
Basic Parameters ◽  
Tank Test ◽  
Open Water Performance ◽  
Thrust And Torque ◽  
Good Agreement

In order to obtain the four quadrants hydrodynamic performance of open water propeller by means of CFD, a mathematic model of three dimensional coordinates points was established and programmed using Matlab based on the basic parameters of propeller. A smooth model propeller was made by importing these points into front end software. Then taking AU model for example, numerical simulations of propeller turning ahead while going ahead, turning ahead while going astern, turning astern while going ahead and turning astern while going astern were carried out. At the same time, the thrust and torque coefficients were presented. The simulation results showed good agreement with the results of tank test. The influence of mesh generation and computational domain on open-water performance were also discussed.

scholarly journals Open-Water Thrust and Torque Predictions of a Ducted Propeller System with a Panel Method

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
J. Baltazar ◽  
J. A. C. Falcão de Campos ◽  
J. Bosschers
Keyword(s):  
Boundary Layer ◽  
Open Water ◽  
Panel Method ◽  
Tip Vortex ◽  
Trailing Edge ◽  
Ducted Propeller ◽  
Performance Predictions ◽  
Wake Alignment ◽  
Thrust And Torque ◽  
Good Agreement

This paper discusses several modelling aspects that are important for the performance predictions of a ducted propulsor with a low-order Panel Method. The aspects discussed are the alignment of the wake geometry, the influence of the duct boundary layer on the wake pitch, and the influence of a transpiration velocity through the gap. The analysis is carried out for propeller Ka4-70 operating without and inside a modified duct 19A, in which the rounded trailing edge is replaced by a sharp trailing edge. Experimental data for the thrust and torque are used to validate the numerical results. The pitch of the tip vortex is found to have a strong influence on the propeller and duct loads. A good agreement with the measurements is achieved when the wake alignment is corrected for the presence of the duct boundary layer.

Numerical investigation of the rake angle effect on the hydrodynamic performance of propeller in a uniform and nonuniform flow

2019 ◽  
Vol 233 (18) ◽  
pp. 6326-6338
Author(s):  
Hasan Sajedi ◽  
Miralam Mahdi
Keyword(s):  
Open Water ◽  
Rake Angle ◽  
Uniform Flow ◽  
Wake Flow ◽  
Hydrodynamic Performance ◽  
Experimental Result ◽  
Nonuniform Flow ◽  
Solution Scheme ◽  
Propeller Performance ◽  
Thrust And Torque

Marine propeller always operates in the wake of a vehicle (ship, torpedo, submarine) but (due to the high computational cost of simulating vehicle and propeller simultaneously) to investigate the propeller geometric parameters, simulations are usually performed in open-water conditions. In this article, using the computational fluid dynamics method with the control volume approach, the effect of the rake angle on the propeller performance and formation of cavitation in the uniform flow (open water) and the nonuniform flow (wake flow) was investigated. In the nonuniform condition, the array of plates was used to simulate wake at upstream propeller. For uniform flow, steady solution scheme was adopted and for nonuniform flow unsteady solution scheme was adopted, and a moving mesh zone was generated around the propeller. To simulate cavitation a multiphase mixture flow, the Reynolds-averaged Navier–Stokes method was used and modeled by Schnerr Sauer's cavitation model. First, the E779a propeller model for numerical validation in the uniform flow and nonuniform flow was investigated. Numerical results were compared with the experimental result, and there was a good agreement between volume of the cavity, thrust, and torque coefficients. To study the effect of rake angle on the performance of B-series propellers, four models with different rake angles were modeled, and simulation was investigated behind the wake. The results of thrust, torque coefficients, and cavitation volume according to the flow parameters and cavitation number were presented as graphs. The results reveals that in the uniform flow, the rake angle has no significant effect on the propeller performance, but behind the wake flow, increase of rake causes to reduce the force applied to the propeller blades, cavitation volume, and pressure fluctuations on the propeller.

Influence Analysis of Blade Fracture on Hydrodynamic Performance of Ducted Propellers Based on CFD

2013 ◽  
Vol 300-301 ◽  
pp. 1071-1076 ◽  
Author(s):  
Li Jian Ou ◽  
De Yu Li ◽  
Wei Zhang
Keyword(s):  
Numerical Model ◽  
Periodic Variation ◽  
Hydrodynamic Performance ◽  
Normal Variation ◽  
Current Field ◽  
Force Coefficient ◽  
Ducted Propeller ◽  
Bearing Force ◽  
Thrust And Torque ◽  
Ducted Propellers

The numerical model of the unsteady flow field of ducted propellers is based on CFD (computational fluid dynamics). By applying the numerical model, the unsteady hydrodynamic performance of the ducted propeller with the fracture at different positions of a certain blade is numerically analyzed under three different wake current fields. Based on regress analysis ,the relationships between the mean KQ、mean KT and the quantity of the blade fracture of ducted propellers are obtained; and the relationships between hydrodynamic coefficients Kp, KQ, KFy (Bearing force coefficient of the propeller) and wake current fields , the quantity of the blade fracture are respectively further analyzed. The results show that: (1) with the increase of the quantity of the blade fracture, the amplitude of bearing force periodic variation of propellers increases, while the thrust and torque reduce; (2) the bearing force of propellers is similarly sine-varying, and the frequency of its variation is unrelated to the normal variation frequency of the wake current field. The more non-uniform the wake current field is, the more the amplitude of its periodic variation is; (3) the thrust and torque of propeller are similarly sine-varying, and the frequencies of their variation are related to the normal variation frequency of the wake current field. And the frequencies equal the shaft frequency multiplied the normal variation frequency of the wake current field. The more non-uniform the wake current field is, the more the amplitude of their periodic variation is.

scholarly journals Calculations of the Hydrodynamic Characteristics of a Ducted Propeller Operating in Oblique Flow

2017 ◽  
Vol 10 (20) ◽  
pp. 31
Author(s):  
Hassan Ghassemi ◽  
Sohrab Majdfar ◽  
Hamid Forouzan
Keyword(s):  
Stokes Equations ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Numerical Code ◽  
Navier Stokes ◽  
Hydrodynamic Characteristics ◽  
Navier Stokes Equations ◽  
Oblique Flow ◽  
Ducted Propeller ◽  
Acceptable Agreement

The purpose of this paper is to calculate the hydrodynamic performance of a ducted propeller (hereafter Duct_P) at oblique flows. e numerical code based on the solution of the Reynolds-averaged Navier– Stokes equations (RANSE) applies to the Kaplan propeller with 19A duct. e shear-stress transport (SST)-k-ω turbulence model is used for the present results. Open-water hydrodynamic results are compared with experimental data showing a relatively acceptable agreement. Two oblique flow angles selected to analyze in this paper are 10 and 20 degrees. Numerical results of the pressure distribution and hydrodynamic performance are presented and discussed. 

scholarly journals Hydrodynamic characteristics of marine composite propeller blade using a numerical approach

2021 ◽  
Vol 10 (1) ◽  
pp. 20
Author(s):  
M L P Kishore ◽  
Vijay K Singh ◽  
R K Behra ◽  
Chandra S Saran ◽  
Manikant Paswan ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Research Work ◽  
Open Water ◽  
Numerical Approach ◽  
Series Data ◽  
Hydrodynamic Characteristics ◽  
Propeller Blade ◽  
Scaled Model ◽  
Fluent Simulation ◽  
Thrust And Torque

<p>The aim of the present research work is to investigate the hydrodynamic characteristics (pressure distribution, rotational speed, thrust and torque) of the conventional B-series composite propeller blade. The open water efficiency for the scaled model of composite propeller blade is computed using computational fluid dynamics (CFD) fluent simulation tool. The obtained numerical results show that the propeller will operate at optimum efficiency for the given speed condition and perform with reduced efficiency at other operational speeds. The computed responses are also validated with the standard B-series data which verifies the accuracy and robustness of the present numerical approach in analyzing the performance characteristics of propellers. The deviation in solution ranges from 5 to 15% in the case of thrust, 10-20% in case of torque. Pressure estimation is usually quite accurate with a 5-8% variation. The tabular data of pressure distribution over the propeller blade may be used for further structural analysis</p>

scholarly journals Numerical Simulation of the Ducted Propeller and Application to a Semi-Submerged Vehicle

2020 ◽  
Vol 27 (2) ◽  
pp. 19-29
Author(s):  
Jin Zou ◽  
Guoge Tan ◽  
Hanbing Sun ◽  
Jie Xu ◽  
Yongkang Hou
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Open Water ◽  
The Self ◽  
Hydrodynamic Performance ◽  
Navier Stokes ◽  
Cfd Simulations ◽  
Ducted Propeller ◽  
Numerical Software ◽  
Numerical Approaches

AbstractThe self-propulsion test of underwater vehicles is the key technique for predicting and evaluating the navigation performance of these submersibles. In this study, the numerical simulation of a standard propeller JD7704+Ka4-70 is first presented and the results are compared with experiments to validate the numerical approaches. The reason why the propulsion efficiency of the ducted propeller is higher than that of the conventional propeller is explored. Then, the paper proposes a series of numerical simulations conducted to test the performance of the ducted propeller designed according to the JD7704+Ka4-70 in order to match with the unmanned semi-submerged vehicle (USSV), and the propeller’s open water characteristic curves are obtained. The results show a reasonable agreement with the regression analysis. Afterwards, the numerical simulations focus on a self-propulsion test of the USSV with the designed ducted propeller and the self-propulsion point is obtained. The streamlines through the hull as well as the ducted propellers are clearly obtained, together with the velocity distributions of the propeller plane. The results vividly demonstrate the hydrodynamic performance of the USSV with the designed propellers. In this paper, all the CFD simulations are based on the numerical software, Star-CCM+, and use the Reynolds-averaged Navier‒Stokes (RANS) equations with the shear stress transport (SST) k-omega turbulence model.

scholarly journals Influence of Various Stator Parameters on the Open-Water Performance of Pump-Jet Propulsion

2021 ◽  
Vol 9 (12) ◽  
pp. 1396
Author(s):  
Fuzheng Li ◽  
Qiaogao Huang ◽  
Guang Pan ◽  
Denghui Qin ◽  
Han Li
Keyword(s):  
Open Water ◽  
Hydrodynamic Performance ◽  
Maximum Efficiency ◽  
Sweep Angle ◽  
Jet Propulsion ◽  
Performance Variation ◽  
Lean Angle ◽  
Open Water Performance ◽  
Stagger Angle ◽  
Thrust And Torque

In order to improve the hydrodynamic performance of pump-jet propulsion (PJP) when matching stator with the rotor, the RANS method with SST k-ω turbulence model is employed to study the influence of six kinds of stator parameters, which are classified into three groups, i.e., stator solidity, stator angles and rotor–stator spacing (S). Results show that the stator solidity involves the blade number (Ns) and chord length (L), has an obvious acceleration effect at and after stator, and produces a higher thrust and torque with a slight efficiency change. Further comparing Ns and L results, we find greater distinctions between the two cases when stator solidity is greatly adjusted. Three stator angles, i.e., stagger angle (α), lean angle (γ), and sweep angle (β), are studied. The α has the biggest effect on the thrust, torque, and efficiency; meanwhile, it shifts the advance number that corresponds to maximum efficiency. The effect of γ is similar to α, but its influence is far less than α. However, there is little difference between various β cases except for off-design conditions, where the efficiency drops dramatically as β increases. The S has a slight effect on PJP performance. Even though S decreases 34% relative to the original PJP, the rotor thrust and torque increase by less than 1%. In addition, we compare torque balance locations under various parameters, and each component force is analyzed in detail to explain the reason for performance variation. The present work is conducive to future optimization in PJP design.

The Ducted Propeller Design and Hydrodynamic Performance Analysis

2014 ◽  
Vol 543-547 ◽  
pp. 28-32
Author(s):  
Hai Qing Lai ◽  
Guo Zhi Bao ◽  
Wei Liu ◽  
Ning Chen
Keyword(s):  
Power Transmission ◽  
Reference Value ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Distribution Law ◽  
Whole Process ◽  
Propeller Design ◽  
Ducted Propeller ◽  
Water Test ◽  
Water Work

This paper aim at the integrated rudder propeller power transmission system which is specific to the towing and tugging ships rudder propeller system, presented an analyzing method with ducted propeller design. Analyzed the thrusttorqueefficiency and total pressure distribution law of blade in the condition of open water work of the propeller by means of finite element method. The numerical results and the flow details are concluded and compared with published experimental data, .Results displayed in good agreement with theoretical analysis results. Initially formed a whole process of design the rudder propeller from the initial ship type parameters to prediction of propeller under open water test condition, and had a certain reference value.

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