2 edition of An analysis procedure for advanced propulsor design found in the catalog.
by Available from National Technical Information Service in Springfield, Va
Written in English
A propeller which operates in the shear flow found near the aft end of marine vehicles experiences an intimate coupling between the propeller"s induced velocity field and the rotational inflow. The presence of the propeller"s induced velocity field causes the inflow to accelerate, which redistributes the vorticity present in the inflow. This redistribution causes a change in the nominal propeller inflow. Because the propeller now experiences a different inflow, the propeller induced velocity field is altered. Thus, there is an intimate coupling between the vorticity present in the fluid inflow and the propeller-generated induced velocity field. Lifting surface propeller blade design codes are incapable of analytically representing the vortical interaction between the induced velocity field and the rotational inflow. An additional difficulty is encountered as downstream blade elements, which would be present in a multi-component propulsor, pass through the singularity wake sheets shed by upstream components. For these reasons, the propeller blade design code should be coupled with an external flow solver which is capable of transporting vorticity. Previous researchers have coupled propeller blade design codes with Reynolds Averaged Navier Stokes (RANS) flow solvers. This powerful method made possible multi-element propulsor design in the presence of rotational inflow. Unfortunately, the use of a RANS code is costly in terms of time and computational resources. This thesis focuses on coupling a propeller blade design code with an axisymmetric, multi-element through-flow code, developed by Drela. The throughflow code uses an integral boundary layer method to solve for the boundary layer flow, and a streamline curvature formulation to solve for the inviscid, outer flow. The main advantage of the present method over previous methods is an order of magnitude reduction in computation time.
|Statement||by Dirk Hampton Renick|
|The Physical Object|
|Pagination||84 leaves ;|
|Number of Pages||84|
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Inflow velocity angle of attack at propulsor location xp Distance from center of ship coordinate system to propulsor KT, K N Propulsor thrust force, normal force coefficients (T/ρn2D4, N/ ρn2D4) KQ, K M Propeller torque, propulsor steering moment coefficients (Q/ρn2D5, M/ ρn2D5) V∞ Free-stream velocity in recirculating water tunnel 2.
The study models the propulsor array and main engine performance at design point using a parametric approach, and further at component level, the study focuses on . "The Solar Cell Array Design Handbook is written at a practicing engineering level and provides a comprehensive compilation of explanatory notes, design practices, analytical models, solar cell characteristics, and material properties data of interest to personnel engaged in solar cell array performance specifications, hardware design, analysis Author: California Hans S. Rauschenbach with Jet Propulsion Laboratory, California Institute of Technology - Pasadena.
Traditionally, designers of marine propulsors select a discrete number of critical design points for which to optimize the propulsor geometry. The design procedure carefully weighs the needs to be fuel efficient, to minimize cavitation, to maintain structural integrity, and to provide enough thrust to reach the desired speed, including the need Cited by: 4. Design of the VCS propulsor, which keeps ships of that class steaming today, started at Carderock in with the first unit delivered in Eighteen propulsors have been delivered on .
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To complete a marine propulsor design. Each of the steps involves a considerable amount of detail and, in the following, each will be discussed briefly in relation to present-day design procedures.
(2) (3) (4) THE PROCEDURE OF DESIGN Preliminary Analysis The preliminary or one-dimensional analysis of a propulsor is a very important Size: 6MB. Suggested Citation:"The Use of a RANS Code in the Design and Analysis of a Naval Combatant." National Research Council.
Twenty-Fourth Symposium on Naval Hydrodynamics. Washington, DC: The National Academies Press. doi: / ×. Shrouded Propulsor. A shrouded propulsor is a directional collar around the submarine's propeller. It lowers the passive sonar signature of the sub and provides improvement over exposed propeller.
I'm working in the Aerospace industry and for me there are only two books on the subject that I use for unclassified reference litterature - this book and "Rocket Propulsion Elements" by C. Sutton. This book covers almost everything on the preliminary design level of a rocket propulsion system.
Except for the typing errors this book is by: The interactive program system for the design/analysis of multi-component marine propulsors described in The analysis procedure for propeller and rudder(/strut) is the original boundary element method (BEM) The design of a multi-staged propulsor is an iterative process, on each step of which the user should check.
Propeller analysis techniques rely on being able to describe the wake field encountered by the propeller at each radial location in a reasonably precise mathematical way. Fig. shows a typical transformation of the wake field velocities at a particular radial location of a polar wake field plot, similar to those shown in Fig.into a mean and fluctuating component.
Propulsor Technology, Inc. is a specialty engineering firm focusing on project management, hardware design, and production support for Navy Ship Propulsion projects. Aerospace Propulsion Systems is a unique book focusing on each type of propulsion system commonly used in aerospace vehicles today: rockets, piston aero engines, gas turbine engines, ramjets, and scramjets.
Thomas A. Ward introduces each system in detail, imparting an understanding of basic engineering principles, describing key functionality /5(3). Washington, DC: The National Academies Press.
doi: / Use of RANS as analysis tool in propulsor design has been proven to be very effective. Renick, D.H.
â An Analysis Procedure for Advanced Propulsor Designâ, Master of Science Thesis, Massachusetts Institute of Technology, May Propulsor definition is - one that propels or produces a propulsive force.
How to use propulsor in a sentence. APPENDIX B: A BOUNDARY ELEMENT METHOD FOR THE MULTI-COMPONENT PROPULSOR In this appendix, we will introduce a boundary element method for the analysis of flow around a multi- component propulsor.
The detail of the theory and numerical algorithm of the propeller boundary element method can be referred to Lee (Lee, ) and Hsin (Hsin, ~.
In summary, the quality of reliability design analyses is significantly increased when worked in a coordinated manner, using realistic assumptions and estimates, and when verification testing is part of the qualification procedure.
Acknowledgements This document is the product of the efforts of a number of people within the ReliabilityFile Size: 1MB. A propulsor is a mechanical device that gives propulsion. The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a propeller.
The Kort nozzle and pump-jet are examples. An example propulsor is shown in the accompanying picture. It has a shroud which cuts down on blade-tip cavitation.
As the complexity of the design procedure increases, the process outlined in Figure is approached, which embodies most of the advanced design and analysis techniques available today. Each designer, however, will use different theoretical methods and his correlation with full-scale experience will be dependent on the methods used.
The design process for the acoustic treatment for the low speed fan used current Pratt and Whitney technology data bases and empirical and semi-empirical prediction tools. A comprehensive design process was started in to design the acoustic treatment for the Pratt & Whitney low speed fan, very high bypass ratio Advanced Ducted Propulsor File Size: 2MB.
3 DESIGN PROCEDURE The design procedure of the propeller should ideally include feedback to the design of the submarine hull and its control surfaces. The progress is iterative and can be illustrated with the classical design spiral.
A similar design spiral can be outlined for the propeller design, cf. Figure 3. It illustrates the main feature Cited by: The book comprises three main sections covering hydrodynamics; materials and mechanical considerations; and design, operation and performance.
The discussion relates theory to practical problems of design, analysis and operational economy, and is supported by extensive design information, operational detail and tabulated data. A 1D thermodynamic cycle analysis is coupled to a RANS simulation to model the aft propulsor at a cruise condition.
A series of design optimization studies are performed, using gradient-based optimization with adjoint analytic derivatives, to minimize the required cruise power assuming different relative sizes of the BLI propulsor.
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, Includes bibliographical references (leaves ).Cited by: 4. Analysis of an Advanced Ducted Propeller Subsonic Inlet Chanthy Iek*, Donald R. Boldman** National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio Mounir Ibrahim*** Cleveland State University Cleveland, Ohio Abstra A time marching Navier-Stokes code called PARC (PARC2D for 2-D/axisymmetric and PARC3D for 3-D.
From Single to Multistage Marine Propulsor: A Fully Numerical Design Approach Stefano Gaggero1, Davide Grassi2, Stefano Brizzolara1 1Marine CFD Group, Department of Naval Architecture, Marine and Electrical Engineering, University of Genova, Italy. 2ZF Marine Group, Arco di Trento, Italy.
conventional shaft line Size: 1MB.Advanced undergraduate students, graduate students and engineering professionals new to the area of propulsion will find Aerospace Propulsion Systems a highly accessible guide to grasping the key essentials.
Field experts will also find that the book is a very useful resource for explaining propulsion issues or technology to engineers Reviews: 5.Propulsion, Performance Podded Propulsor Tests and Extrapolation Effective Date Revision 00 be mounted upstream of the propeller model.
This is similar to the set up for testing of a con-ventional propeller described in the procedure “Propeller Open Water Tests”. For a pulling thruster, the forward hub cap.