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LIBROSDetailed Design of Ship Propellers | REF.: LDD-1 |
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AUTOR: Gonzalo Perez Gomez [Ver más del mismo autor]
AUTOR: Juan Gonzalez-Adalid [Ver más del mismo autor]
TEMA: Motores Marinos [Ver más libros del tema]
RESUMEN DEL LIBRO:
Las hélices antiguas y modernas apenas se diferencian. En tanto todo en ingeniería está en continuo cambio y progresando, en lo que hace referencia a las hélices, es extraño que no se hayan producido cambios esenciales desde los últimos cien años, y que sería interesante crear un nuevo tipo. Trabajando con ideas nuevas, tras muchos esfuerzos de los autores, promovieron una, llamada TVF.
PRECIO: 65,95 Euros
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IDIOMA | PAGINAS | AÑO | EDICION | MEDIDAS | ILUSTRACION | ENCUADERNACION | Inglés- | 526- | 1998- | 1ª- | 30,5x21,5- | Dib. b/n, Fot. b/n- | Sobre Cubierta- |
INDICE DEL LIBRO:
Foreword.
Preface.
DESCRIPTION OF THE CALCULATION PROCESS REQUESTED TO CARRY OUT THE DESIGNS OF A PROPELLER:
Introduction.
Boundary conditions afecting to the design of a propeller
Selection of the propeller number blades
Considerations on the propeller geometrical characteristics to be used as input in the propeller design:
Adoption of a generatrix line and a radial distribution of the skew.
Definition of the chord-lenghts radia distribution of the blades annular sections.
Definition of the maximum thikness radial distribution of the blades annular sections.
Selection of the mean line and the thickness distribution of the blades annular sections.
DEFINITION OF THE PROPELLER LOADING RADIAL DISTRIBUTION TO BE USED AS INPUT IN THE PROPELLER DESIGN PROCESS:
Radial distribution of circulation and thrust per unit of radial lenght.
Definition of the radial distribution of the coefficients sharing th load between the camber and angle of attack.
Definition of the radial distribution of the circumferential mean values of the wake coefficients to be used as input in the propeller design process.
DESCRIPTIONS OF THE ITERATIVE CALCULATIONS PROCEDURE TO BE FOLLOWED TO REACH THE DEFINITIV GEOMETRY OF THE PROPELLER:
Generalities.
Determination of the propeller optimum diameter.
Iterative calculations procedure to be followed to define the propeller Geometry.
MATHEMATICAL MODELIZATION OF THE ACTION EXERTED BY THE PROPELLER ON THE SURROUNDED WATER:
Introduction.
Boundary conditions.
Lifting line theory.
The assumption that the propeller has an infinite number of blades.
THE ASSUMPTION THAT THE PROPELLER HAS A FINITE NUMBER OF BLADES:
Introduction.
Equivalence between a propeller and its associated free vortex system.
Calculation of the velocities induced at a point P of the propeller disk by g helicoidal free vortices twisted on a cylinder of radius r0.
Calculation of the velocity induced at a point on the shaft line.
Rectification of the results appearing in Lerbs' paper.
Calculation of the induced velocities by means as asyntotical approximations.
Introduction factors.
Calculation of the induced velocity at a point of radius r situated on a lifting line produced by g helicoidal surfaces of free vortices.
Generalization of Lerbs and Morgan and Wrench developments.
Calculation of the velocities induced by g lifting lines in a point P of the propeller disk.
Calculations of the induced velocities, given the required thrust or the absorbed power, the revolution rate, the radial distribution of the mean circumferential values of the velocity field, and the type of the bound vorticity distribution law.
Observations on the most adequated procedure tu put in practice the preceding ideas.
Lifting surface theory.
Panel methods.
NEW MOMENTUM THEORY:
Axial momentum Theory.
New mixed Momentum Theory.
Application of the precedent developments to the design of wake adapted propellers.
Comparison between the results obtained with the lifting line theory and de New Momentum Theory.
Comparison between the results obtained applying the generalized lifting line theory and the New Momentum Theory.
Generalization of the New Momentum Theory.
Considerations on the shape of the optimum loading radia distribution of a propeller.
CALCULATION OF BOTH CAMBER AND ANGLE OF ATTACK OF THE PROPELLER BLADE ANNULAR SECTIONS. NEW CASCADES THEORY:
Generalities.
The assumption that each propeller blades annular section performs as if it belongs to a two-dimensional profile of infinite span with a transversal section equal to the developed contour of said propeller blades annular section.
Corrections to the preceding developments to obtain both th three-dimensional camber-chord ratio and geometrical pitch angle corresponding to the propeller blades annular sections. Traditional point of view.
New Cascades Theory.
CALCULATION OF PROPELLER BLADES STRENGTH:
Generalities.
Basical hypotesis.
Stresses due to pure traction effort.
Stresses due to shear forces.
BENDING MOMENT IN THE DIRECTION OF MINIMUM GEOMETRICAL MODULUS:
Componen due to pressure and viscous forces.
Component due to the inertial forces.
Final value.
Spin moment.
Normal stresses due to the bending moment.
Tangential stresses due to spin moment.
Von misses stresses.
Stresses existing on the end plates of CLT propellers.
PROPELLER GEOMETRY DEVELOPMENT OF CONSTRUCTIVE PROPELLER DRAWINGS:
Introduction.
DEFINITIONS AND REFERENCE SYSTEMS:
General definitions.
Frames of reference lines.
Propeller reference lines.
Cylindrical coordinates.
Expanded view coordinates.
Annular section geometry.
Rake and skew.
Mathematical definition for ponts on the propeller blade surface.
Propeller drawing.
ANTI-SINGING EDGES, TREE TRUNK AND OTHER PROPELLER GEOMETRICAL DETAILS:
Anti-singing edge
Maximum thickness radial distribution.
Blade root fillet design.
Geometrical pitch distribution.
Blade tip.
Controllable pitch propeller drawings.
EVALUATION OF THE PROPELLER OPEN WATER EFFICIENCY IN A PRELIMINARY STAGE OF THE PROPELLER DESIGN:
Introduction.
Equivalent profile theory.
Prediction of a ship performance with a propeller designed to absorb a certain power at a given revolutions rate using the New Momentum Theory in association with the equivalent profile theory:
Introduction.
Propeller open water efficiency calculation knowing the type of loading radial distribution, the number of blades, the blade area ratio, the propeller diameter, the design power and the revolutions rate of a propeller.
Propeller diameter optimization.
Calculation of the pitch and the camber-chord ratio corresponding to the radial station x=0,7.
Application example of the preceding developments.
Preliminary design of propellers to be fitted on tugs and trawlers.
OPTIMIZATION ON THE PROPULSIVE EFFCIENCY OF A SHIP:
Introduction.
Deduction of the analytical expression on the propulsive efficiency of a ship.
SOLUTIONS ENDEAVOUR TO REDUCE THE THRUST DEDUCTION COEFFICIENT (t):
Generalities.
To place the propeller far from the ship sterntube.
To fit some fins on the ship afterbody.
To fit a nozzle on the ship afterbody.
To combine an accelerating nozzle with some fins.
On the negative influence of the rudder's thickness on the thrust deduction coefficient.
SOLUTIONS ENDEAVOUR TO INCREASE THE WAKE FRACTION (w):
Generalities.
To introduce stern bulbous.
To introduce two afterbodies in the case of two shaft lines ships.
To place a pre-swirl vane or post-swirl vane in front or after the propeller.
To place some fins either on the rudder or the rudder horn.
SOLUTIONS ENDEAVOUR TO RECOVER ENERGY OF THE PROPELLER:
Generalities.
Grim's vane wheel.
To placea diffuser downstream of the propeller.
Solutions endeavour to improve the propeller open water efficiency acting on the propeller loading radial distribution.
Remarks.
THE DESIGN OF SPECIAL PROPELLERS:
Introduciton.
CONTROLLABLE PITCH PROPELLERS:
Gneralities.
Considerations that must be taken into account when it is intended to design a controllable pitch propeller.
Performance of the tip plates of controllable pitch CLT propellers.
Influence of the propeller revolutions on the propeller open water efficiency of a controllable pitch propeller.
NOZZLE PROPELLERS:
Generalities.
Most adequated procedure to extrapolate at full scale the experimental results of ships fitted with nozzle propellers.
Hydrodinamical design of propellers working inside nozzle propellers.
MARIN model tests results of nozzle propellers.
Evaluation of the boundary conditions that a nozzle exerts on the velocities field of the propeller working inside.
Alternative procedure to emulate the influence of the tangential components of the velocities induced by the nozzle both on the propeller thrust and its geometrical pitch.
Application exmple of the precedent explanations.
Knowing the results of the open water tests of a nozzle propeller, deduction of the results that would have been obtained in the case that only propeller would have been tested.
CLT PROPELLERS:
Generalities.
Prfesentation of the TVF propeller concept and first experimental results.
Generalization of Lerbs induction factors method and new experimental works.
Realization of the first trials at full scale and deduction of the first correlation coefficients corresponding to the extrapolation procedure of TVF propellers.
TVF propeller fitted at the ¨Munguia¨tanker.
Development of CLT propellers.
Some alternative ideas to CLT propellers.
CONTRAROTATING AND TANDEM PROPELLERS:
Introduction.
Generalities.
Basical information corresponding to the ship for which the propulsion system is to be optimized.
Suggestions about the most adequated procedure to extrapolate at full scale the experimental results corresponding to ships fitted with propellers in series.
Calculations process that must be followed to carry out the design of propellers in series.
Description of the optimization process carried out of the propulsion system of the ship studied.
Verification of the calculations carried out using the theoretical developments above described with the results of an experimental program conducted in Hamburg Model Basin.
Conclusions.
PREDICTION OF THE CAVITATION DEVELOPMENT ON THE PROPELLER BLADES ANNULAR SECTIONS:
Introduction.
Introduction to the experimental study of the cavitation phenomena.
Arguments on some of the existing procedures to carry out cavitation tests.
Most frequent types of cavitation.
Some requirements that must be satisfied by the ship hull afterbody lines to avoid that harmful cavitation be developed on the propeller.
Calculation of cavitation extension on propeller blades annular sections.
Use of incipient cavitation curves corresponding to profiles which geometry is obtained by superposition of a mean line and a thickness distribution.
PREDICTION OF THE PERFORMANCE OF A PROPELLER WITH KNOWN GEOMETRY INSIDE A VELOCITIES FIELD WITH AXIAL AND TANGENTIAL COMPONENTS VARYING BOTH RADIALLY AND CIRCUMFERENTIALLY:
Conventional propellers operating inside a unidirectional and uniform velocities field.
CLT propellers operatiing inside a unidirectional and uniform velocities field.
Propellers operating inside a velocities field with axial and tangential components varying both radually and circumferentially.
APPENDIX A. GENERAL EQUATIONS OF THE THREE-DIMENSIONAL MOTIONS OF INCOMPRESSIBLE IDEAL FLUIDS:
Introduction.
Bernouilli Theorem.
Momentum Theorem.
Kinetic Moment Theorem.
Vorticity.
Vorticity variations.
Kutta-Joukowsky Theorem.
APPENDIX B. SOLUTION OF INCOMPRESSIBLE, POTENTIAL, IDEAL FLOW EQUATIONS:
Introduction.
Harmonic functions.
Harmonic vectors.
Dirichlet and Neumann problems.
Definition of the potential velocity field by means of vortex distribution.
Definition of the potential velocity field by means of sinks, sources and doublets.
General solution of ythe equations of potential motions of the incompressible ideal fluids.
Generalities on the numerical procedures which must be used for the resolution of icompressible, potential and ideal flow equations.
APPENDIX C. MOTIONS OF AN INCOMPRESSIBLE IDEAL FLUIDS AROUND TWO-DIMENSIONAL WINGS:
Introduction.
Thin wings.
Thick wings.
Some useful information.
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