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Author: M. H. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 382
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Book Description
A numerical model is established for the design of propeller blade shape for a prescribed circulation and a given hub geometry. The vortex lattice approach is adapted for blades and their wakes. The hub is represented by a distribution of dipoles which ends at the hub apex. It is shown that consideration of the hub results in a lower pitch and lower camber at the inner radii. An iterative method is developed for analyzing the interference between the blades and the hub. It is shown that the circulation at the root of a propeller with a hub. It is shown that the circulation at the root of a propeller with a hub is larger than the circulation at the root of a propeller without a hub. Two examples show that the increase in thrust due to hub effects has the same order of magnitude as the drag force effects on the hub for propellers which are moderately loaded at the hub. Experiments are carried out for comparison with the numerical results. Excellent agreement is obtained in the circulation distribution for a conventional propeller, and fair agreement for a controllable pitch propeller. Experimental results show what the circulation is, roughly speaking, conserved. A method for estimating the drag force of the hub due to the hub vortex is established by assuming that the circulation is conserved.
Author: M. H. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 382
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Book Description
A numerical model is established for the design of propeller blade shape for a prescribed circulation and a given hub geometry. The vortex lattice approach is adapted for blades and their wakes. The hub is represented by a distribution of dipoles which ends at the hub apex. It is shown that consideration of the hub results in a lower pitch and lower camber at the inner radii. An iterative method is developed for analyzing the interference between the blades and the hub. It is shown that the circulation at the root of a propeller with a hub. It is shown that the circulation at the root of a propeller with a hub is larger than the circulation at the root of a propeller without a hub. Two examples show that the increase in thrust due to hub effects has the same order of magnitude as the drag force effects on the hub for propellers which are moderately loaded at the hub. Experiments are carried out for comparison with the numerical results. Excellent agreement is obtained in the circulation distribution for a conventional propeller, and fair agreement for a controllable pitch propeller. Experimental results show what the circulation is, roughly speaking, conserved. A method for estimating the drag force of the hub due to the hub vortex is established by assuming that the circulation is conserved.
Author:
Publisher:
ISBN:
Category : Propellers, Aerial
Languages : en
Pages : 336
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Book Description
Author: John Carlton
Publisher: Butterworth-Heinemann
ISBN: 0080971237
Category : Technology & Engineering
Languages : en
Pages : 539
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Book Description
The early development of the screw propeller. Propeller geometry. The propeller environment. The ship wake field, propeller performance characteristics.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
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Book Description
Author: Anthony F. Molland
Publisher: Cambridge University Press
ISBN: 0521760526
Category : Science
Languages : en
Pages : 569
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Book Description
Written by experts in the ship design field, this book provides a comprehensive approach to evaluating ship resistance and propulsion.
Author: Ian P. Tracy
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
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Book Description
An experimental study was performed to design and analyze a "pusher" propeller for use by a small, expendable, autonomous unmanned aerial vehicle (UAV) whose mission was to descend from 30,000 feet to sea level at an approximately constant descent rate over a 3-hour mission duration. The entire propeller design process, from airfoil selection to final part generation in the computer-aided drafting program SolidWorks is described. QMIL and QPROP were the programs of choice for producing a propeller design focused on yielding minimum induced losses for optimal aerodynamic efficiency given a conservative aerodynamic design point. The TA22 airfoil defined the propeller cross section and NEU-012-030-4000 DC brushless motor was selected to power the propeller. The initial propeller design was modified to comply with size constraints set by the mission. Wind tunnel tests were conducted to determine the effect of fuselage blanketing on propeller performance. Of particular interest was comparing the power required to propel the aircraft at a given airspeed for a configuration in which the propeller was mounted behind the fuselage, and one in which the propeller was not obstructed by an upstream object and instead isolated in the incoming airstream. It was empirically found that fuselage blanketing had a significantly detrimental impact on each of the 4 propellers used in testing. It was therefore recommended that the hub section of the propeller be redesigned to mitigate drag and propulsive losses resulting from reduced momentum in the blanketed region of the propeller. This recommendation was applied to the included propeller design and propeller betas in the hub region were reduced using qualitative methods.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309184533
Category : Science
Languages : en
Pages : 1039
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Book Description
The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309254671
Category : Science
Languages : en
Pages : 1024
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Book Description
"Vive la Revolution!" was the theme of the Twenty-Third Symposium on Naval Hydrodynamics held in Val de Reuil, France, from September 17-22, 2000 as more than 140 experts in ship design, construction, and operation came together to exchange naval research developments. The forum encouraged both formal and informal discussion of presented papers, and the occasion provides an opportunity for direct communication between international peers. This book includes sixty-three papers presented at the symposium which was organized jointly by the Office of Naval Research, the National Research Council (Naval Studies Board), and the Bassin d'Essais des Carènes. This book includes the ten topical areas discussed at the symposium: wave-induced motions and loads, hydrodynamics in ship design, propulsor hydrodynamics and hydroacoustics, CFD validation, viscous ship hydrodynamics, cavitation and bubbly flow, wave hydrodynamics, wake dynamics, shallow water hydrodynamics, and fluid dynamics in the naval context.
Author: Benjamin Y.-H. Chen
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 40
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Book Description
A contrarotating (CR) propeller design with a tractor pod for a high speed patrol boat is addressed. In the current arrangement, a CR propeller is placed at the forward end of a pod which is aligned with the local inflow. The powering and cavitation experiments show the performance prediction agree well with measurements. Compared to the existing controllable pitch propeller with shaft and struct configureation, the pod-mounted CR propeller show a 28% reduction in power consumption at design speed with a 7 know improvement in cavitation inception speed. At full power, a larger pod is required, which will reduce the gain in power consumption.
Author: Edward Sand
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
