aerodynamics of electric arcs in axial flow

by D. R. Topham

Written in English
Published: Downloads: 639
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Edition Notes

Thesis(Ph.D.) - Loughborough University of Technology 1970.

Statementby D.R. Topham.
ID Numbers
Open LibraryOL20877738M

Axial Centrifugal p Figure 3. Flow exits an axial rotor (left) in an axial direction, while flow from a centrifugal impeller (right) exits radially. Radial Component Tangential Component Exit Flow Inlet Exit Flow p Figure 4. Flow exits a centrifugal impeller in the direction of rotation, just as sparks fly from a grinding wheel. The red arrows. full text of "aerodynamic investigation of an air-cooled axial-flow 1: turbine design and overall stage performance without supply of cooling air" see other formats nasa technical translation. nasa tt f~l6, aekodynamic investigation of an air-cooled axial-flow turbine. Aerodynamics is the branch of hydrodynamics that deals with the laws of air motion and with the forces acting on the surfaces of streamlined bodies. Aerodynamics generally studies motion with velocities which are far short of the sound velocity ( m/s, km/h). The axial-flow fan has a blade wheel located in a cylindrical casing. When. Author of Annulus wall boundary layers in turbomachines, Cogeneration--combined heat and power (CHP), Axial flow compressors, fluid mechanics and thermodynamics, Advanced Gas Turbine Cycles, Combined power plants, Axial flow turbines, Energy, Axial flow turbines: fluid .

The numerical simulation and wind tunnel experiment are employed to investigate the aerodynamic characteristics of automobile. The object is to investigate the sensibility of aerodynamic characteristic to the underbody, and summarize the influence of aerodynamic attachments on the aerodynamic drag, which can provide more useful date as a reference to underbody design of automobile. This book provides a thorough description of actual working aerodynamic design and analysis systems, for both axial-flow and radial-flow turbines. It describes the basic fluid dynamic and thermodynamic principles, empirical models and numerical methods used for the full range of procedures and analytical tools that an engineer needs for virtually any type of aerodynamic design or analysis. Axial Flow Fans_qxd 4/11/ PM Page 3. AXIAL FLOW FANS GENERAL INFORMATION The blades have been designed for optimal performance, for both aerodynamic needs as well as noise characteristics. They are available in a range of materials as shown below: Impeller Ranges. Aerofoil and Euler theories applied to Axial Pumps and Fans. Basic Aerodynamics Theory Understanding how an aeroplane derives lift with the Bernoulli's equation, and looking at the forces acting on an aeroplane in flight.

  As early as the s, contra-rotating impeller design was used in industrial axial flow fans (Cory ). Eck () rated these fans with good aerodynamic performance. Since the s, more studies have been focused on the aerodynamics and acoustics of contra-rotating axial flow fans and compressors (Roy et al. ; Sharma and Adekoya ). Between and Alan Arnold Griffith designed a series of turbine engines that were built under the direction of Hayne Constant at the Royal Aircraft Establishment (RAE). The designs were advanced for the era, typically featuring a "two-spool" layout with high- and low-pressure compressors that individually had more stages than typical engines of the era. Therefore, to power all of a car’s electrical equipment as well as an additional E-supercharger, a volt battery would really be needed. Although, considering the sheer amount of electrical. A centrifugal-flow compressor can normally attain a compression ratio of , but an axial-flow model may achieve ratios of more than _____. During engine start on a turbine engine, what is used to light the fuel-air mixture in the combustion chamber?

aerodynamics of electric arcs in axial flow by D. R. Topham Download PDF EPUB FB2

The aerodynamics of electric arcs in axial flow. By David R. Topham. Download PDF (3 MB) Abstract. A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough thesis investigates the behaviour of a d.c.

electric\ud arc under the influence of a number of different Author: David R. Topham. The aerodynamics of electric arcs in axial flow Author: Topham, David R.

Awarding Body: Loughborough University of Technology Current Institution: Loughborough University Date of Award: Availability of Full Text:Author: David R. Topham. A multidisciplinary optimization to simultaneously enhance the aerodynamic and aeroacoustic performance of an axial-flow fan was performed.

Flow analysis through the axial-flow fan was conducted by solving three-dimensional steady and unsteady Reynolds-averaged Navier–Stokes equations with the shear-stress transport turbulence model. Starting with the results for the unsteady flow Cited by:   A multidisciplinary optimization to simultaneously enhance the aerodynamic and aeroacoustic performance of an axial-flow fan was performed.

Flow analysis through the axial-flow fan was conducted by solving three-dimensional steady and unsteady Reynolds-averaged Navier–Stokes equations with the shear-stress transport turbulence by: Fundamental aerothermodynamic equations derived in Chapter 1 may now be applied for aerodynamic design of axial flow compressors and turbines.

A typical sketch of an axial flow Author: W. Loh. The air stream in the axial fan moves along the axial direction of the fan. The mechanical energy of the driver is converted into spiral airflow aerodynamics of electric arcs in axial flow book the fan discharge.

The air is pressurized by the aerodynamic lift generated by the fan blades, much like a propeller and an aeroplane wing (see Figure ). Although they can sometimes be used. This paper describes the design, numerical verification and tests of a highly loaded single stage axial flow fan making use of extensive blade sweep in rotor and stator for acoustic reasons.

The tests include aerodynamic and acoustic investigations. The stage is a conventional free vortex design with unconventional blades of a special planform. The paper presents a historical overview of the developments of aerodynamic design methods for low-speed axial-flow fans.

This historical overview starts from the first fan applications, dating back to the 16th century, and arrives to the modern times of computer-based design techniques, passing through the pioneering times of aerodynamic theories and the times of designing before computers.

The same fundamental laws, if they were fully known, would apply to both internal and external flows, but there are at present considerable differences in practice between the data obtained, and the detail methods used, for the two categories of flow. This lecture attempts to cover in a general way the internal aerodynamic flow through gas.

Boyce provides an up-to-date reference covering all major aspects of design, operation, and maintenance. He includes technical details on sizing, plant layout, fuel selection, types of drives, and performance characteristics of all major components in a co-generation or combined-cycle power plant.

Contents: Section 1: Design, theory, and practice An history and overview of centrifugal 5/5(3). As electric/electronic devices get smaller and functional, the noise of cooling device becomes important.

This page will explain the origins of noise generation from small axial cooling fans used in electronic goods like desktop/laptop computers. The source of fan noises includes aerodynamic noise as well as operating sound of the fan itself.

Starting with basic principles in aerodynamics and thermodynamics, this book systematically expounds the recent research on mechanisms of flows in axial gas turbines, including high pressure and low pressure turbines, inter-turbine ducts and turbine rear frame ducts, and introduces the classical and innovative numerical evaluation methods in.

instabilities leading to a transition to an “arc” phase is reached. The threshold current for the development of the “glow-to-arc” transition depends on the operating conditions of the discharge. Many aerodynamic flow control applications would require plasma actuators to operate near atmospheric pressure.

This favors ac operation over dc. Transonic axial flow compressors are today widely used in aircraft engines to obtain maximum pressure ratios per single-stage. Fig. 1 shows the fan of the EJ engine as an example for highly loaded, high performance transonic rotors.

Download: Download full-size image Fig. This book provides a thorough description of actual, working aerodynamic design and analysis systems, for both axial-flow and radial-flow turbines. It describes. Discover the best Aerodynamics books and audiobooks.

Learn from Aerodynamics experts like G. Tokaty and Cliff Matthews. Read Aerodynamics books like A History and Philosophy of Fluid Mechanics and Aeronautical Engineer's Data Book with a free trial.

The field of aerodynamics studies the motion of air around an object, such as an aircraft. After introducing fundamental concepts such as fluid flow, Thin Airfoil Theory, and Finite Wing Theory, A First Course on Aerodynamics presents the fundamentals of three key topics: Inviscid Compressible Flow, Viscous Flow, and wind tunnels.

For a single-stage variable-pitch axial fan, the aerodynamic performance and through flow with and without blade skewing are examined numerically.

Simulated results show that the total pressure rise and efficiency increase by % and %, respectively, with the best forward-skewed angle of θ = 3° at the design conditions.

At the blade pitch angles of β = 29° and 35°, the. Influence of tip clearance on the turbulent aerodynamics of axial flow fan under off design conditions. Simulation of traditional composites under thermal loads; Design of solar powered long endurance flying wing; Particulate laden flow simulation in three dimensional axial.

A cascade is defined as an infinite row of equidistant similarly aerofoil bodies. The cascade is used to divert a flow stream with a minimal loss.

The flow over an axial cascade presents a complicated intra blade fluid dynamic interaction that causes the flow to behave differently than the flow over a single aerofoil blade. A cascade tunnel in which different shapes of cascades could be tested.

Volume X of the High Speed Aerodynamics and Jet Propulsion series. Contents include: Theory of Two-Dimensional Flow through Cascades; Three-Dimensional Flow in Turbomachines; Experimental Techniques; Flow in Cascades; The Axial Compressor Stage; The Supersonic Compressor; Aerodynamic Design of Axial Flow Turbines; The Radial Turbine; The Centrifugal Compressor; Intermittent Flow.

Plasma-Based flow control on wind turbines. Plasma-Based flow control in axial fans. Fundamental studies on unsteady aerodynamics.

Wind-energy generation by active flow control. Plasma flow characterization in electric arc tunnels. The rotor blades turn the flow incoming in the rotor frame of reference at velocity v ri and diffuse it down to velocity v re.

The stator sees the incoming flow at u re and diffuses it down to u se and turns it back to the axial direction. The typical axial Mach number is around and the rotor angular Mach number (ωr/a) is kept as high as.

Johnson IA, Bullock RO (eds) () Aerodynamic design of axial flow compressors, NASA SP Google Scholar Chmielniak T, Lepszy S, Rulik S () Algorithm for design calculation of axial flow gas turbine compressor – comparison with GTD compressor design. Axial fans, as the name implies, move an airstream along the axis of the fan.

The air is pressurized by the aerodynamic lift generated by the fan blades, much like a propeller and an airplane wing. Although they can sometimes be used interchange-ably with centrifugal fans, axial fans are commonly used in “clean air,” low-pressure, high-volume.

In an axial flow compressor, each stage incrementally boosts the pressure from the previous stage. A single stage of compression consists of a set of rotor blades attached to a rotating disk, followed by stator vanes attached to a stationary ring.

The flow area between the compressor blades is slightly divergent. Flow area between. Lecture 40 - Waves in 1D Compressible Flow. Lecture 41 - Normal Shock Waves.

Lecture 42 - Propagation of Disturbances By a Moving Object. Lecture 43 - Linearized Compressible Potential Flow Governing Equation. Lecture 44 - Implications of Linearized Supersonic Flow on Airfoil Lift and Drag.

Lecture 45 - Oblique Shock Waves. 10 February Aerodynamics Lecture 17 Profile drag qRelated to viscous effects of flow over lifting surface qAlso called “form drag” due to separation of boundary layer around the object’s form Source: Newman, Dava J., Interactive Aerospace Engineering and Design.

The invention improves axial flow compressor rotor and stator blade durability by eliminating or reducing the coherent aerodynamic forces created by rotating stall.

More specifically, the invention provides a method to mistune the rotating stall aerodynamics thereby preventing the formation of coherent unsteady loads.

An axial compressor is a gas compressor that can continuously pressurize is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of rotation, or differs from other rotating compressors such as centrifugal compressor, axi-centrifugal compressors and mixed-flow compressors where the fluid flow will include a "radial.

Z.-H. Du's 79 research works with citations and reads, including: Study of the Water Droplets Impingement Characteristics on the S Airfoil.

This book provides a thorough description of actual, working aerodynamic design and analysis systems, for both axial-flow and radial-flow turbines. It describes the basic fluid dynamic and thermodynamic principles, empirical models and numerical methods used for the full range of procedures and analytical tools that an engineer needs for Reviews: 3.The Biot–Savart law is used for computing the resultant magnetic field B at position r in 3D-space generated by a flexible current I (for example due to a wire).

A steady (or stationary) current is a continual flow of charges which does not change with time and the charge neither accumulates nor depletes at any point.

The law is a physical example of a line integral, being evaluated over the.