scholarly journals Optimization of thruster propeller geometry to mitigate periodical forces

2019 ◽  
Vol S-I (2) ◽  
pp. 67-72
Author(s):  
V. Bagrintsev ◽  
◽  
A. Koval ◽  
N. Marinich ◽  
◽  
...  
Keyword(s):  
Propeller Geometry

RANS Maneuvering Simulation of Esso Osaka With Rudder and a Body-Force Propeller

2005 ◽  
Vol 49 (02) ◽  
pp. 98-120
Author(s):  
Claus D. Simonsen ◽  
Frederick Stern
Keyword(s):  
Flow Field ◽  
Open Water ◽  
Verification And Validation ◽  
Fair Agreement ◽  
Navier Stokes ◽  
Complex Flow ◽  
Flow Problems ◽  
The Difference ◽  
Propeller Geometry ◽  
Flow Study

A simplified potential theory-based infinite-bladed propeller model is coupled with the Reynolds averaged Navier-Stokes (RANS) code CFDSHIP-IOWA to give a model that interactively determines propeller-hull-rudder interaction without requiring detailed modeling of the propeller geometry. Computations are performed for an open-water propeller, for the Series 60 ship sailing straight ahead and for the appended tanker Esso Osaka in different maneuvering conditions. The results are compared with experimental data, and the tanker data are further used to study the interaction among the propeller, hull, and rudder. A comparison between calculated and measured data for the Series 60 ship shows fair agreement, where the computation captures the trends in the flow, that is, the flow structure and the magnitude of the field quantities together with the integral quantities. For the tanker, the flow study reveals a rather complex flow field in the stern region, where the velocity distribution and propeller loading reflect the flow field changes caused by the different maneuvering conditions. The integral quantities, that is, the propeller, hull, and rudder forces, are in fair agreement with experiments. No formal verification and validation are performed, so the present results are related to previous work with verification and validation of the same model, but without the propeller. For the validated cases, the levels of validation are the same as without the propeller, because the validation uncertainties, that is, the combined experimental and simulation uncertainties, are assumed to be the same for both cases. Based on this, validation is obtained for approximately the same cases as for the without-propeller conditions, but the comparison errors, that is, the difference between experiment and calculation, are different. For instance, the difference between computation and experiment for the ship resistance is generally larger with the propeller than without, whereas the opposite is the case for the rudder drag. Summarizing the results, the method shows encouraging results, and taking the effort related to modeling the propeller into account, the method appears to be useful in connection with studies of rudder-propeller-hull related flow problems, where the real propeller geometry cannot be modeled.

scholarly journals NUMERICAL STUDY OF ACOUSTIC CHARACTERISTICS OF A DTMB 4119 PROPELLER DUE TO TIP RAKE

2019 ◽  
Author(s):  
Danio Joe ◽  
Vijit Misra ◽  
R Vijayakumar
Keyword(s):  
Marine Mammals ◽  
Numerical Study ◽  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Acoustic Characteristics ◽  
Radiated Noise ◽  
Propeller Noise ◽  
Disk Plane ◽  
Propeller Geometry ◽  
The Impact

The impact of increased Underwater Radiated Noise (URN) over the past two decades on marine mammals has resulted in the pressing requirement to reduce it. Shipping contributes immensely to the URN. Propeller noise is a major source of URN. The reduction in Propeller noise can hence significantly help in the reduction of URN. With the sole objective of improving the hydrodynamic performance of propellers ways to prevent cavitation are being developed. However, the reduction of non cavitating noise produced by the propeller would still remain a challenge. The change in the propeller geometry can modify the acoustic characteristics. In this present study, effect of modifying the tip of DTMB4119 propeller on the acoustic and hydrodynamic characteristics is presented. The change in the flow pattern at the tip due to introduction of tip rake is also discussed. The SPL has been calculated by using the two-step Ffowcs William and Hawkings (FW-H) equations from the pressure distribution at various points around the propeller. SPL at various points in the downstream and propeller disk plane are numerically predicted and discussed.

Design of propeller geometry using streamline-adapted blade sections

2008 ◽  
Vol 14 (2) ◽  
pp. 161-170 ◽  
Author(s):  
Yoo-Chul Kim ◽  
Tae-Wan Kim ◽  
Sangwoo Pyo ◽  
Jung-Chun Suh
Keyword(s):  
Propeller Geometry

Hydrocomp Design and Prediction of Hydrodynamic Performance of Propeller

2014 ◽  
Vol 641-642 ◽  
pp. 283-287
Author(s):  
Ai Feng Zhang ◽  
Tian Lei Zhang ◽  
Jiang Ming Ding ◽  
Jin Yang Liu
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Hydrodynamic Performance ◽  
Geometry Model ◽  
Propeller Design ◽  
Design Software ◽  
And Performance ◽  
Propeller Geometry ◽  
Performance Research ◽  
Ship Propeller

With the continuous development of large-scale, high-speed ship, considering economy and security of the ship, propeller design and performance research are of importance. In this paper, the best propeller is obtained by using the propeller design software HydroComp PropExpert and HydroComp PropCAD. Propeller geometry model is generated by Solidworks. Applying computational fluid dynamics method (CFD), we can take numerical simulation for the flow around the propeller. Finally, with the help of the software ANSYS, hydrodynamic performance of the design propeller can be forecasted. The results from the calculation and analysis can provide some reference for engineering practical problems and theoretical study.

Numerical investigation of mutual interaction between a pusher propeller and a fuselage

2020 ◽  
pp. 095441002093279 ◽  
Author(s):  
Marcin Figat ◽  
Paulina Piątkowska
Keyword(s):  
Numerical Analysis ◽  
Knowledge Base ◽  
Numerical Investigation ◽  
Significant Influence ◽  
Rotation Rate ◽  
Pitch Ratio ◽  
Propeller Performance ◽  
Propeller Geometry ◽  
The Impact ◽  
Propeller Thrust

This article presents the numerical analysis of the aerodynamic impact of the fuselage on propeller performance in the pusher configuration and the propeller impact on the flow around the fuselage. The main aim of the presented investigation was to find the magnitude of the interaction between the propeller and the fuselage. This effect was evaluated based on the analysis of the change of the fuselage drag and the propeller thrust according to the change of the propeller's geometry. All obtained results allowed to prepare the methodology for choosing the best propeller geometry for the aircraft in the pusher configuration. During the investigation, the impact of the propeller geometry on the results was analysed. First of all, the change of the blade pitch ratio and the propeller radius was tested. Computation was made for numerous flight conditions and propeller rotation rate. As a main result, the relation between the propeller performance and the fuselage in the pusher configuration was found. Especially, the significant influence on the propeller thrust caused by the fuselage and the influence on the fuselage drag caused by the propeller were observed. Finally, all the obtained outcomes were used to create a knowledge base, which was next used to select the best propeller geometry to satisfy the required power condition for a level flight for the newly designed aircraft PW-Chimera.

scholarly journals Design of Propeller Series Optimizing Fuel Consumption and Propeller Efficiency

2021 ◽  
Vol 9 (11) ◽  
pp. 1226
Author(s):  
Mina Tadros ◽  
Manuel Ventura ◽  
Carlos Guedes Soares
Keyword(s):  
Fuel Consumption ◽  
Fitness Function ◽  
Open Water ◽  
Design Tool ◽  
Design Parameters ◽  
Propeller Design ◽  
Water Conditions ◽  
Calm Water ◽  
Propeller Performance ◽  
Propeller Geometry

This paper presents a comparison between different types of propellers operated in calm water to evaluate their performance behind hulls and in open-water conditions. A bulk carrier is chosen as a case study to perform the simulation and to evaluate the performance of several propeller series, namely the Wagengein B-series, Kaplan 19A, and MAU. Firstly, optimization procedures are performed by coupling a propeller design tool and a nonlinear optimizer to find the optimum design parameters of a fixed-pitch propeller. This optimization model aims to design the propeller behind the hull at the engine operating point with minimum fuel consumption and maximum propeller efficiency. The two main objectives of this study and the constraints are defined in a single fitness function to find the optimum values of the propeller geometry and the gearbox ratio. By considering the benefits of the single-objective over the multi-objective optimization problem, this model helps to find the optimum propeller for both defined objectives instead of only considering one of them, as in previous studies. Then, based on the optimized parameters, the propeller performance is calculated in open-water conditions. From the computed results, one can observe the importance of considering the hull–propulsor interaction in propeller selection.

scholarly journals Wind Tunnel Performance Tests of the Propellers with Different Pitch for the Electric Propulsion System

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 2
Author(s):  
Zbigniew Czyż ◽  
Paweł Karpiński ◽  
Krzysztof Skiba ◽  
Mirosław Wendeker
Keyword(s):  
Wind Tunnel ◽  
Electric Propulsion ◽  
Aerodynamic Performance ◽  
Force Balance ◽  
Performance Tests ◽  
Electrical Parameters ◽  
Subsonic Wind Tunnel ◽  
Propeller Performance ◽  
Propeller Geometry ◽  
Thrust And Torque

The geometry of a propeller is closely related to its aerodynamic performance. One of the geometric parameters of a propeller is pitch. This parameter determines the distance by which the propeller moves forward during one revolution. The challenge is to select a propeller geometry for electric propulsion in order to achieve the best possible performance. This paper presents the experimental results of the aerodynamic performance of the set of propellers with different pitch values. The tests were performed in a closed-circuit subsonic wind tunnel using a six-component force balance. The analyzed propellers were 12-inch diameter twin-blade propellers that were driven by a BLDC (brushless direct current) electric motor. The tests were performed under forced airflow conditions. The thrust and torque produced by the propeller were measured using a strain gauge. The analysis was performed for different values of the advance ratio which is the ratio of freestream fluid speed to propeller tip speed. Additionally, a set of electrical parameters was recorded using the created measurement system. The propeller performance was evaluated by a dimensional analysis. This method enables calculation of dimensionless coefficients which are useful for comparing performance data for propellers.

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