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2 edition of numerical representation of pump-turbine performance characteristics found in the catalog.

numerical representation of pump-turbine performance characteristics

N. Walmsley

numerical representation of pump-turbine performance characteristics

by N. Walmsley

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  • 24 Currently reading

Published by typescript in [s.l.] .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Warwick, 1986.

Statementby N. Walmsley.
ID Numbers
Open LibraryOL13863911M

The scope includes all aspects of hydraulic design, 3D-flow phenomena and partload operation, cavitation, numerical flow calculations, hydraulic forces, pressure pu (展开全部) This book gives an unparalleled, up-to-date, in-depth treatment of all kinds of flow phenomena encountered in centrifugal pumps including the complex interactions of fluid flow with vibrations and wear of ://   The parameters investigated are the nozzle angle, number of turbine inlets and mass flow rates. Contrary to earlier studies, an effort was made to determine the performance under varying loading conditions, and hence identify the complete performance ://

N. Walmsley has written: 'Copper coil forming jig' 'The numerical representation of pump-turbine performance characteristics' What is virtual representation? Representation in a ://    Introduction. It is well known that gas and steam cycles play a dominant role in large-scale stationary power generation. Open-cycle gas turbines (often combined with steam cycles) are widely used, especially where low-cost natural gas is available, while steam cycles are the preferred solution when the energy source characteristics, typically coal or nuclear, require a closed-cycle power

Unavoidable tip clearance between blade tip and casing shroud plays an important role in the performance and characteristics of a tidal propeller turbine. In this work, the tip-leakage vortex (TLV) induced in the end-wall region was numerically illustrated by using the shear-stress transport (SST) k–ω turbulence model at various flow conditions and different tip-clearance sizes Downloadable (with restrictions)! A one-dimensional numerical code estimating the performances of centrifugal PATs (pumps used as turbines) is presented. Firstly, the code calculates the geometrical components of the PAT using information provided in manufacturer catalogues. Then, once these parameters are deduced, it calculates the losses and determines the characteristics curves of the ://


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Numerical representation of pump-turbine performance characteristics by N. Walmsley Download PDF EPUB FB2

The numerical representation of pump-turbine performance characteristics. By Nigel Walmsley. Get PDF (20 MB) Abstract.

This thesis investigates the hydraulic transient analysis of hydro-power plants with particular emphasis being placed on the turbine and\ud pump-turbine boundary conditions.

Two methods of obtaining turbine\ud performance The problems particular to the unit parameter representation of four quadrant reversible pump-turbine performance characteristics for use in hydraulic transient analyses were investigated.

A review of alternative forms of representation led to the solution of the pump-turbine boundary based on a modified unit parameter   Steam turbine design is based on some characteristic features such as inlet pressure and temperature, flow rate, outlet pressure etc.

and turbine geometry, dimensions and performance are defined with this characteristic features. Turbine loses and irreversibilities are minimum and performance and power generation are maximum at design ://   This research consists of predicting the performance and efficiency of hydraulic pumps and motors, both with experiments and modeling.

A pump and motor test stand is con-structed to measure the efficiency of an axial piston swashplate pump/motor unit. A regenerative loop hydraulic system is used to reduce the power requirements of the test ://   Example Centrifugal Pump Performance Based on Inlet/Outlet Velocities zWater is pumped at the rate of gpm through a centrifugal pump operating at a speed of rpm.

The numerical representation of pump-turbine performance characteristics book has a uniform blade length, b, of 2 in.

with r 1 = in. and r 2 = in., and the exit blade angle is β=23º. Assume ideal flow conditions and that Defining Pump Characteristic Curves. The pump characteristic curves can be defined as ‘the graphical representation of a particular pump’s behavior and performance under different operating conditions’.

The operating properties of a pump are established by the geometry and dimensions of the pump’s impeller and ?id=   Pump-turbine characteristics for analysis of unsteady flows Z.

Giljen1, M. Nedeljković2 and Y. Cheng3 1PhD student, Senior engineer for mechanical works, Business and Technical Development Directorate, Sector for new projects, Montenegro Electric Company, Therefore, constructing a set of pump-turbine characteristics is necessary, when no suitable characteristics at the same specific speed can be used for substitution.

In this paper, we propose a new method for pump-turbine characterization at any specific speed using a database of 25 available sets of pump-turbine :// /Construction-of-Pump-Turbine-Characteristics-at.

Head and flow rate are the important parameters for proper selection of centrifugal pump. However, the reversed operation of centrifugal pump leads to the off-design characteristi   Numerical inves-tigation using k-ε turbulence model in the water turbine as discussed Jifeng Wang, Blake gower and Norbert Muller[3].

The performance of the pump was numerically optimized on a two-dimensional centrifugal pump impeller to find the impeller geometry for maximizing the pump efficiency by varying the design variables S.C.

Bhatia, in Advanced Renewable Energy Systems, Gas turbine efficiency. Turbine efficiency is the ratio of actual work output of the turbine to the net input energy supplied in the form of fuel.

For stand-alone gas turbines, without any heat recovery system the efficiency will be as low as 35 to 40 per cent. This is attributed to the blade efficiency of the rotor, leakage through A. Carravetta, O.

Fecarotta, H. Ramos, Numerical simulation on pump as turbine: mesh reliability and performance concerns, in International Conference on Clean Electrical Power (ICCEP) (), pp. – Google Scholar Ron Astall, United Pumps Australia Ask ten different pump engineers for their guidelines on establishing centrifugal pump minimum flow and you might get ten different answers.

Even agreeing on a basic definition for minimum flow can be problematic. A definition that at first glance seems more than reasonable is as follows: The lowest pump flow that can be maintained continuously [ ] 2 days ago  Centrifugal Pumps describes the whole range of the centrifugal pump (mixed flow and axial flow pumps are dealt with more briefly), with emphasis on the development of the boiler feed pump.

Organized into 46 chapters, this book discusses the general hydrodynamic principles, performance, dimensions, type number, flow, and efficiency of N.

Walmsley, The numerical representation of pump-turbine performance characteristics [Ph.D. thesis], University of Warwick, Warwicks, UK, W. Weng and J. Yang, “Study on the partition of the characteristic curve and the numerical simulation of the boundary of the unit,” Water Resources and Hydropower Engineering, vol.

34, no. 2, pp   A reliable numerical calculation of the 4Q pump characteristics is a very challenging task as the abnormal operating conditions lead to complex and unsteady flow phenomena inside the pump.

Gros [9] and Couzinet [10] investigated the 4Q pump performance by means of numerical simulation and experimental ://   Figure 3c Typical deep well residential submersible pump. Three important characteristics of pump systems: pressure, friction and flow Figure 4 Three important characteristics of pump systems.

Pressure, friction and flow are three important characteristics of a pump system. Pressure is the driving force responsible for the movement of the :// Savonius Wind Turbine: Numerical Study, This study aimed to understand the performance and shape characteristics of a helical Savonius wind turbine at various helical angles.

the book is Downloadable (with restrictions). Pump as turbine (PAT), an effective and simple way to recover energy from high pressure fluid, has been one of hot issues in scientific research and engineering applications.

Unlike previous computational fluid dynamics (CFD) work on PAT's velocity and pressure fields, this paper first focused on the internal flow rate characteristics, attempted to reveal the The book is focused on fostering this understanding which will benefit the pump engineer in industry as well as academia and students.

Keywords cavitation fluid flow hydraulic design hydraulic forces hydraulics material selection materials numerical flow calculations pump materials pump selection quality troubleshooting two-phase flow pumping.

@article{osti_, title = {Turbulent heat transfer performance of single stage turbine}, author = {Amano, R S and Song, B}, abstractNote = {To increase the efficiency and the power of modern power plant gas turbines, designers are continually trying to raise the maximum turbine inlet temperature.

Here, a numerical study based on the Navier-Stokes equations on a three-dimensional /turbulent-heat-transfer-performance-single-stage-turbine.Volute is an important hydraulic part of centrifugal pump, hydraulic loss within pump volute takes up a large part of total hydraulic loss within pump, thus appropriate design of pump volute has significant meaning to centrifugal pump performance.

In this paper, numerical method was adopted to investigate volute main geometric parameters, including volute throat area, volute cross-section The mechanisms leading to stationary vortex formation and rotating stall were analyzed with a pump-turbine model by the means of numerical simulations and test rig ://