Download or read book Application of the Vortex lattice Method to Propeller Performance Analysis Thesis written by Marc L. Masquelier and published by . This book was released on 1982 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of the Vortex Lattice Method to Propeller Performance Analysis written by and published by . This book was released on 1982 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to examine the feasibility of applying a vortex lattice method to propeller performance analysis. This method allows the calculation of spanwise and chordwise pressure distributions on thin propeller blades of arbitrary planform. The research for this project involves the application of a vortex lattice method to a propeller with twisted, non- cambered, constant chord blades. The analysis assumes incompressible, inviscid flow over thin sections. The helical wake is modeled as a series of straight vortex filament segments. A computer code has been developed which uses a vortex lattice method to predict performance for propellers. Results are shown for several operating conditions, using various angle of attack distributions, numbers of blades on the propeller, and advance ratios. Similar results are shown using the blade-element theory for comparison. Results indicate that this vortex lattice method is applicable to initial propeller performance analysis.
Download or read book Application of the Vortex lattice Method to Propeller Performance Analysis written by Marc L. Masquelier (1LT, USAF.) and published by . This book was released on 1981 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Singularity Methods for Rapid Design and Analysis of Cross flow Propellers and Turbines written by Bernard T. Roesler and published by . This book was released on 2017 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: In their respective quests for higher energy efficiency and greater power extraction, the marine transportation and marine hydrokinetic industries have developed a class of devices known as cross-flow propellers and turbines. To predict the performance of these devices, engineers require accurate computational models. Traditional Reynolds-averaged Navier- Stokes equation (RANS) solvers provide an accurate, detailed description of the fluid flow, but the transient solution for each design iteration often requires a number of days to complete. At the other end of the spectrum, lumped airfoil models are fast, but accuracy is limited to certain design geometries and operating conditions. This thesis applies the vortex lattice method (VLM) to the cross-flow rotor design problem, to fill the need for a computational method to analyze cross-flow rotors that is at once fast, accurate, and robust. We first explore the standard lumped airfoil model as applied to a cross-flow propeller. We perform a design study to demonstrate the applicability of the model to design a propeller for an inland waterway vessel, and we conduct a model-scale experiment of a novel propeller design in order to validate our model for the propeller case. Through comparison with RANS simulations, however, we find the lumped airfoil model to be inaccurate for the turbine case. We then present the vortex lattice method, which includes implementation features to improve accuracy and computational efficiency for the cross-flow rotor design problem. We compare our VLM results to RANS solutions to demonstrate our significant improvement over the state-of-the-art lumped airfoil methods. Finally, we investigate the sensitivity of the model to changes in each of its parameters in order to determine the robustness of our model. Throughout this thesis, we follow the cycle of engineering design to make observations of the operation of cross-flow devices, gain insights on the physical phenomena governing their operation, and incorporate those insights into our models.
Download or read book Numerical Prediction of Propeller Performance by Vortex Lattice Method written by Cheung, Richard Shiu Wing and published by . This book was released on 1987 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 3rd Annual International Conference on Material Machines and Methods for Sustainable Development MMMS2022 written by Banh Tien Long and published by Springer Nature. This book was released on with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Propellers and Propulsion written by John Carlton and published by Butterworth-Heinemann. This book was released on 2018-11-30 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine Propellers and Propulsion, Fourth Edition, offers comprehensive, cutting edge coverage to equip marine engineers, naval architects or anyone involved in propulsion and hydrodynamics with essential job knowledge. Propulsion technology is a complex, multidisciplinary topic with design, construction, operational and research implications. Drawing on experience from a long and varied career in consulting, research, design and technical investigation, John Carlton examines hydrodynamic theory, materials and mechanical considerations, and design, operation and performance. Connecting essential theory to practical problems in design, analysis and operational efficiency, the book is an invaluable resource, packed with hard-won insights, detailed specifications and data. Features comprehensive coverage of marine propellers, fully updated and revised, with new chapters on propulsion in ice and high speed propellers Includes enhanced content on full-scale trials, propeller materials, propeller blade vibration, operational problems and much more Synthesizes otherwise disparate material on the theory and practice of propulsion technology from the past 40 years’ development, including the latest developments in improving efficiency Written by a leading expert on propeller technology, essential for students, marine engineers and naval architects involved in propulsion and hydrodynamics
Download or read book Hydrodynamics of Ship Propellers written by John P. Breslin and published by Cambridge University Press. This book was released on 1994 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technical introduction to ship propeller hydrodynamics, for researchers in ocean technology, naval architecture, mechanical engineering.
Download or read book An Enhanced Propeller Blade Design Program Based on a Vortex Lattice Method written by Lawrence Leibman and published by . This book was released on 1991 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP written by and published by . This book was released on 1986 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Propeller Blade Pressure Distribution with a Panel Method written by Cheng I. Yang and published by . This book was released on 1990 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Panel methods and their underlying theory are reviewed with regard to hydrodynamic analysis of propeller performance. Green's identity is used to convert the differential Laplace's equation into an integral equation. The velocity potential on the surface of the lifting body can be expressed by integrating the potential induced by source/doublet singularities distributed over the surface. The numerical discretizations of the boundary surface, singularity distributions, the integral equation, and the formulation of the panel method are discussed. The advantages of the application of panel methods in viscous/inviscid interactive procedures and propeller blade design are outlined. Results of propeller blade analysis with the panel method are presented, comparing the prediction of the VSAERO panel method and a vortex lattice method with experimental data. The panel method, which includes consideration of propeller hub effects, gives predictions in good agreement with experimental data. Keywords: Marine propellers hydrodynamic characteristics. (edc).
Download or read book Cavitation and Bubble Dynamics written by Phoevos Koukouvinis and published by Elsevier. This book was released on 2021-09-24 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation and Bubble Dynamics: Fundamentals and Applications examines the latest advances in the field of cavitation and multiphase flows, including associated effects such as material erosion and spray instabilities. This book tackles the challenges of cavitation hindrance in the industrial world, while also drawing on interdisciplinary research to inform academic audiences on the latest advances in the fundamentals. Contributions to the book come from a wide range of specialists in areas including fuel systems, hydropower, marine engineering, multiphase flows and computational fluid mechanics, allowing readers to discover novel interdisciplinary experimentation techniques and research results. This book will be an essential tool for industry professionals and researchers working on applications where cavitation hindrance affects reliability, noise, and vibrations. Covers a wide range of cavitation and bubble dynamics phenomena, including shock wave emission, jetting, and luminescence Provides the latest advice about applications including cavitation tunnels, cavitation testing, flow designs to avoid cavitation in pumps and other hydromachinery, and flow lines Describes novel experimental techniques, such as x-ray imaging and new computational techniques
Download or read book Ship Resistance and Propulsion written by Anthony F. Molland and published by Cambridge University Press. This book was released on 2017-08-17 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition provides a comprehensive and scientific approach to evaluating ship resistance and propulsion. Written by experts in the field, it includes the latest developments in CFD, experimental techniques and guidance for the practical estimation of ship propulsive power. It addresses improvements in energy efficiency and reduced emissions, and the introduction of the Energy Efficiency Design Index (EEDI). Descriptions have now been included of pump jets, rim driven propulsors, shape adaptive foils, propeller noise and dynamic positioning. Trial procedures have been updated, and preliminary estimates of power for hydrofoil craft, submarines and AUVs are incorporated. Standard series data for hull resistance and propeller performance are included, enabling practitioners to make ship power predictions based on material and data within the book. Numerous fully worked examples illustrate applications for most ship and small craft types, making this book ideal for practising engineers, naval architects, marine engineers and undergraduate and postgraduate students.
Download or read book Boundary Element Methods in Engineering and Sciences written by M. H. Aliabadi and published by World Scientific. This book was released on 2011 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: The boundary element method (BEM), also known as the boundary integral equation method (BIEM), is a modern numerical technique. It is an established alternative to traditional computational methods of engineering analysis. This book provides a comprehensive account of the method and its application to problems in engineering and science.
Download or read book Simulation of a High Disc Loading Free Propeller in a Cross Flow by the Vortex Lattice Method written by and published by . This book was released on 1972 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to develop an analytical model for the investigation of flow fields about intermediate disc loading lift devices for VTOL applications. Classical vortex-lattice theory was used in conjunction with experimental data for representing a free propeller in a crossflow. The jet phenomena to be simulated by the method are discussed. A number of previous attempts at vortex-lattice modeling are presented. Analytical stream lines and field vectors are compared with available experimental data. The results are evaluated and recommendations are made for further model development.
Download or read book Propeller Performance Analysis Using Lifting Line Theory written by Kevin Michael Flood and published by . This book was released on 2008 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Propellers are typically optimized to provide the maximum thrust for the minimum torque at a specific number of revolutions per minute (RPM) at a particular ship speed. This process allows ships to efficiently travel at their design speed. However, it is useful to know how the propeller performs during off-design conditions. This is especially true for naval warships whose missions require them to perform at a wide range of speeds. Currently the Open-source Propeller Design and Analysis Program can design and analyze a propeller only at a given operating condition (i.e. a given propeller RPM and thrust). If these values are varied, the program will design a new optimal propeller for the given inputs. The purpose of this thesis is to take a propeller that is designed for a given case and analyze how it will behave in off-design conditions. Propeller performance is analyzed using non-dimensional curves that depict thrust, torque, and efficiency as functions of the propeller speed of advance. The first step in producing the open water diagram is to use lifting line theory to characterize the propeller blades. The bound circulation on the lifting line is a function of the blade geometry along with the blade velocity (both rotational and axial). Lerbs provided a method to evaluate the circulation for a given set of these conditions. This thesis implements Lerbs method using MATLAB® code to allow for fast and accurate modeling of circulation distributions and induced velocities for a wide range of operating conditions. These values are then used to calculate the forces and efficiency of the propeller. The program shows good agreement with experimental data.
