scholarly journals Marine Propeller Design Method based on Lifting Line Theory and Lifting Surface Correction Factors

2017 ◽  
Vol 194 ◽  
pp. 174-181 ◽  
Author(s):  
Ataur Rahman ◽  
Md Refayet Ullah ◽  
Md. Mashud Karim
Keyword(s):  
Design Method ◽  
Correction Factors ◽  
Marine Propeller ◽  
Propeller Design ◽  
Lifting Surface ◽  
Line Theory ◽  
Surface Correction ◽  
Lifting Line ◽  
Lifting Line Theory

Some Remarks on Vortex Drag and its Spanwise Distribution in Incompressible Flow

1968 ◽  
Vol 72 (691) ◽  
pp. 623-625 ◽  
Author(s):  
H. C. Garner
Keyword(s):  
Theoretical Data ◽  
Leading Edge ◽  
List Type ◽  
Surface Theory ◽  
Lifting Surface ◽  
Line Theory ◽  
Lifting Line ◽  
Swept Wings ◽  
Lifting Line Theory ◽  
Drag Factor

Summary Theoretical data from lifting-surface theory are presented to illustrate (i) that the vortex drag factor is closely related to the half-wing spanwise centre of pressure on simple planforms without camber or twist, (ii) that lifting-line theory is useless for predicting the spanwise distribution of vortex drag on swept wings, (iii) that recent numerical improvements in lifting-surface theory help to reconcile the concepts of wake energy and leading-edge suction in relation to vortex drag.

Induced Curved-Flow Effect in the Lifting-Surface Theory of the Widely Bladed Propellers

1967 ◽  
Vol 11 (01) ◽  
pp. 61-70
Author(s):  
Tetsuo Nishiyama ◽  
Takao Sasajima
Keyword(s):  
Present Theory ◽  
Surface Theory ◽  
Flow Effect ◽  
Lifting Surface ◽  
Line Theory ◽  
Lift Curve ◽  
Lifting Line ◽  
Lifting Line Theory ◽  
Good Agreement ◽  
Blade Element

The present paper is aimed to develop a more accurate lifting-surface theory of widely bladed propellers by applying the Scholz' technique. Curved-flow effect, which is of essential importance in the theory of widely bladed propellers, is analyzed and clarified in detail in the forms of correction coefficients to the lift-curve slope and zero lift angle of the blade element. Further, curved-flow correction to the lifting-line theory and the corresponding factor to the Ginzel's camber correction are shown by the present theory. The theoretical characteristics seem to be in good agreement with the experiment, so far as the assumption of linearization holds.

A New Approach to Lifting Line Theory: Hub and Duct Effects

2006 ◽  
Vol 50 (02) ◽  
pp. 138-146
Author(s):  
Victor G. Mishkevich
Keyword(s):  
Mathematical Model ◽  
Singular Integrals ◽  
Jacobi Polynomials ◽  
New Approach ◽  
Improve Design ◽  
Propeller Design ◽  
Line Theory ◽  
Circulation Distribution ◽  
Lifting Line ◽  
Lifting Line Theory

This paper deals with a new approach to lifting line theory in which the presence of a hub and/or duct is taken into account by introducing the generalized induction factors. The proposed mathematical model is built on the assumption that the hub and/or duct are simulated with infinite cylinders. The circulation distribution function is represented in the form of a series of orthogonal Jacobi polynomials that covers all cases that can occur in practical propeller design, including both zero and nonzero gap conditions. The integral equation of the lifting line theory is solved numerically by applying the highest accuracy quadrature formula for singular integrals. Propellers with optimum and arbitrary circulation distribution are considered. The proposed theory is intended to improve design of the near hub and duct blade sections, cavitation control, and integral propeller characteristics. Numerical results are presented for the purpose of comparison with different methods and to illustrate the developed approach.

Unified Rotor Lifting Line Theory

2013 ◽  
Vol 57 (04) ◽  
pp. 181-201
Author(s):  
Brenden P. Epps ◽  
Richard W. Kimball
Keyword(s):  
Axial Flow ◽  
Preliminary Design ◽  
Propeller Design ◽  
Performance Curves ◽  
Line Theory ◽  
Parametric Studies ◽  
Lifting Line ◽  
Lifting Line Method ◽  
Lifting Line Theory ◽  
Line Analysis

A unified lifting line method for the design and analysis of axial flow propellers and turbines is presented. The method incorporates significant improvements to the classical lifting line methods for propeller design to extend the method to the design of turbines. In addition, lifting line analysis methods are developed to extend the usefulness of the lifting line model to allow generation of performance curves for off-design analysis. The result is a fast computational methodology for the design and analysis of propellers or turbines that can be used in preliminary design and parametric studies. Design and analysis validation cases are presented and compared with experimental data.

Development of a Lifting-Line-Based Method for Preliminary Propeller Design

2018 ◽  
Author(s):  
Jose Rodolfo Chreim ◽  
Marcos de Mattos Pimenta ◽  
Joao Lucas Dozzi Dantas ◽  
Gustavo R. S. Assi ◽  
Eduardo Tadashi Katsuno
Keyword(s):  
Convergence Rates ◽  
Control Points ◽  
Numerical Implementation ◽  
Marine Propellers ◽  
Propeller Design ◽  
Line Theory ◽  
Thrust And Torque ◽  
Lifting Line ◽  
Lifting Line Theory

A novel formulation for marine propellers based on adaptations from wing lifting-line theory is presented; the method is capable of simulating propellers with skewed and raked blades. It also incorporates the influence of viscosity on thrust and torque from hydrofoil data through a nonlinear scheme that changes the location of the control points iteratively. Several convergence studies are conducted to verify the different aspects of the numerical implementation and the results indicate satisfactory convergence rates for Kaplan, KCA, and B-Troost propellers. It is expected that the method accurately describes thrust, torque, and efficiency under the moderately loaded propeller assumption.

scholarly journals Prediction of Lift Coefficient for Tandem Wing Configuration or Multiple-Lifting-Surface System Using Prandtl’s Lifting-Line Theory

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Hao Cheng ◽  
Hua Wang
Keyword(s):  
Numerical Solutions ◽  
Hind Wing ◽  
Incidence Angle ◽  
Lift Coefficient ◽  
Design Parameters ◽  
Lifting Surface ◽  
Surface System ◽  
Line Theory ◽  
Lifting Line ◽  
Lifting Line Theory

In tandem airfoil configuration or multiple-lifting-surface layouts, due to the flow interaction among their lifting surfaces, the aerodynamic characteristics can be affected by each other. In accordance with Prandtl’s classical lifting-line theory, a method to calculate the section lift coefficient for the tandem wing configuration or multiple-lifting-surface system is presented. In that method, the form of Fourier sine series is used to express the variation of the section circulation which changes continuously along the wingspan. The accuracy of the numerical solutions obtained by the method has been validated by the data obtained from computational fluid dynamics and tunnel experiment. By varying the design parameters, such as the gap, the stagger, the incidence angle, the wingspan, the taper ratio as well as the aspect ratio, a series of tandem wing configurations are tested to analyze the lift coefficient and the induced drag of each lifting surface. From the results, it can be seen that the bigger negative gap and stagger can produce better lift characteristic for tandem wing configuration. Besides, it will also be beneficial for the lift characteristic when the incidence angle and the wingspan of fore wing are appropriately declined or if the incidence angle and the wingspan of hind wing are appropriately increased.

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