Author: J. E. Hesselgreaves
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
The Performance of an Axial-flow Fan Designed by Computer
Author: J. E. Hesselgreaves
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Off-Design Computer Code for Calculating the Aerodynamic Performance of Axial-Flow Fans and Compressors
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781730977305
Category :
Languages : en
Pages : 96
Book Description
An off-design axial-flow compressor code is presented and is available from COSMIC for predicting the aerodynamic performance maps of fans and compressors. Steady axisymmetric flow is assumed and the aerodynamic solution reduces to solving the two-dimensional flow field in the meridional plane. A streamline curvature method is used for calculating this flow-field outside the blade rows. This code allows for bleed flows and the first five stators can be reset for each rotational speed, capabilities which are necessary for large multistage compressors. The accuracy of the off-design performance predictions depend upon the validity of the flow loss and deviation correlation models. These empirical correlations for the flow loss and deviation are used to model the real flow effects and the off-design code will compute through small reverse flow regions. The input to this off-design code is fully described and a user's example case for a two-stage fan is included with complete input and output data sets. Also, a comparison of the off-design code predictions with experimental data is included which generally shows good agreement. Schmidt, James F. Unspecified Center...
Publisher:
ISBN: 9781730977305
Category :
Languages : en
Pages : 96
Book Description
An off-design axial-flow compressor code is presented and is available from COSMIC for predicting the aerodynamic performance maps of fans and compressors. Steady axisymmetric flow is assumed and the aerodynamic solution reduces to solving the two-dimensional flow field in the meridional plane. A streamline curvature method is used for calculating this flow-field outside the blade rows. This code allows for bleed flows and the first five stators can be reset for each rotational speed, capabilities which are necessary for large multistage compressors. The accuracy of the off-design performance predictions depend upon the validity of the flow loss and deviation correlation models. These empirical correlations for the flow loss and deviation are used to model the real flow effects and the off-design code will compute through small reverse flow regions. The input to this off-design code is fully described and a user's example case for a two-stage fan is included with complete input and output data sets. Also, a comparison of the off-design code predictions with experimental data is included which generally shows good agreement. Schmidt, James F. Unspecified Center...
Axial Flow Fans
Author: R. A. Wallis
Publisher: Academic Press
ISBN: 1483274225
Category : Technology & Engineering
Languages : en
Pages : 381
Book Description
Axial Flow Fans: Design and Practice focuses on the design of axial flow fans and the practices involved in their applications. The manuscript first offers information on the fluid mechanics of ducted fans, boundary layer and skin friction relations, and aerofoil data for blade design. Discussions focus on flow deflection in cascade of aerofoils, pitching moment, lift, surface roughness in turbulent boundary layers, turbulent boundary layers in pressure gradients, laminar skin friction, viscosity and boundary layers, and similarity and non-dimensional numbers. The text then ponders on vortex flows in ducting and fan, ducts, and introduction to fan design methods. The book takes a look at the momentum and blade element considerations on free vortex flow of rotor and rotor losses. Topics include momentum considerations, profile drag, tip clearance losses, optimum conditions in terms of the flow and swirl coefficients, pressure relations and velocity vectors, and thrust and torque gradients. Tail fairing design and associated losses, overall efficiencies, torque, thrust, and power, and the design of fan unit with arbitrary vortex flow are also discussed. The publication is a dependable source of information for engineers and readers interested in the design of axial flow fans and practices involved in their operation.
Publisher: Academic Press
ISBN: 1483274225
Category : Technology & Engineering
Languages : en
Pages : 381
Book Description
Axial Flow Fans: Design and Practice focuses on the design of axial flow fans and the practices involved in their applications. The manuscript first offers information on the fluid mechanics of ducted fans, boundary layer and skin friction relations, and aerofoil data for blade design. Discussions focus on flow deflection in cascade of aerofoils, pitching moment, lift, surface roughness in turbulent boundary layers, turbulent boundary layers in pressure gradients, laminar skin friction, viscosity and boundary layers, and similarity and non-dimensional numbers. The text then ponders on vortex flows in ducting and fan, ducts, and introduction to fan design methods. The book takes a look at the momentum and blade element considerations on free vortex flow of rotor and rotor losses. Topics include momentum considerations, profile drag, tip clearance losses, optimum conditions in terms of the flow and swirl coefficients, pressure relations and velocity vectors, and thrust and torque gradients. Tail fairing design and associated losses, overall efficiencies, torque, thrust, and power, and the design of fan unit with arbitrary vortex flow are also discussed. The publication is a dependable source of information for engineers and readers interested in the design of axial flow fans and practices involved in their operation.
The Design of Axial-flow Fans by Computer
Author: D.J. Myles
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Axial Flow Fans and Ducts
Author: R. A. Wallis
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 464
Book Description
Covers the theory, design, analysis, testing, and research of axial flow fans. Contains up-to-date data on recent developments in the field. Interrelates fan and duct design techniques. Discusses commercial and product development test procedures. Covers future experimental research objectives. Includes a reference section on F-series of airfoils.
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 464
Book Description
Covers the theory, design, analysis, testing, and research of axial flow fans. Contains up-to-date data on recent developments in the field. Interrelates fan and duct design techniques. Discusses commercial and product development test procedures. Covers future experimental research objectives. Includes a reference section on F-series of airfoils.
The Theory and Performance of Axial-flow Fans
Author: Curt Keller
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 166
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 166
Book Description
The Design of Axial-flow Fans by Computer
Author: David James Myles
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Ducted Fan Design: Volume 1 - Propulsion Physics and Design of Fans and Long-Chord Ducts
Author: Marc de Piolenc
Publisher: Lulu.com
ISBN: 0359104908
Category :
Languages : en
Pages : 182
Book Description
Publisher: Lulu.com
ISBN: 0359104908
Category :
Languages : en
Pages : 182
Book Description
Influence of Wall Boundary Layer Upon the Performance of an Axial-flow Fan Rotor
Author: Emanuel Boxer
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 28
Book Description
An experimental investigation has been conducted to determine the effects of the wall boundary layer upon the performance of an axial-flow fan rotor. Tests were conducted at low Mach numbers and at one blade angle on a fan designed to have uniform downstream tangential velocity. The maximum disturbed-flow region of the six boundary-layer configurations tested exceeded one-half of the annular width of the duct and the peak efficiency was reduced 2 1/2 percent for this condition. The over-all loss in efficiency may possibly be reduced by decreasing the blade pitch angle in the boundary-layer region to conform to the upstream velocity profile.
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 28
Book Description
An experimental investigation has been conducted to determine the effects of the wall boundary layer upon the performance of an axial-flow fan rotor. Tests were conducted at low Mach numbers and at one blade angle on a fan designed to have uniform downstream tangential velocity. The maximum disturbed-flow region of the six boundary-layer configurations tested exceeded one-half of the annular width of the duct and the peak efficiency was reduced 2 1/2 percent for this condition. The over-all loss in efficiency may possibly be reduced by decreasing the blade pitch angle in the boundary-layer region to conform to the upstream velocity profile.
Computer-aided Design of Axial-flow Fans
Author: Laura M. Powers
Publisher:
ISBN:
Category : Turbomachines
Languages : en
Pages : 370
Book Description
Publisher:
ISBN:
Category : Turbomachines
Languages : en
Pages : 370
Book Description