Simulation and characterization of the effect of an eccentric pipe in a cross flow turbine
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Date
2013-01
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Addis Ababa University
Abstract
In this research a typical practical T15-300a type cross flow turbine is used as a
model and four different eccentric pipe diameters are used to numerically simulate
and characterize their effect on the fluid flow inside the turbine at three different
guide valve angle position. Also a specific flow parameter is taken from a practical
site survey at Janbaria river, a tributary of Kesem river, in Amhara Region; for all
models. Totally twelve model cases are used for simulation purpose.
The T15-300a model is drawn using a SOLIDWORKS 2012 student version
package to give the physical model.
A student version software package of GAMBIT and FLUENT software is used to
analyze the numerical simulation for all the models developed initially in
SOLIDWORKS software.
Using the numerical simulation results obtained on contours of static pressure,
contours of dynamic pressure, contours of velocity magnitude, contours of radial
velocity and velocity vectors colored by static pressure and velocity magnitude
inside the fluid interior for all models are compared and analyzed.
In this specific paper a Cartesian coordinate system is used for numerical modeling
of the cases and simulates and analyzes the result.
As the simulation result show, when increasing the eccentric pipe diameter at any
guide valve position has an effect of decreasing most of the flow parameters such
as static pressure, dynamic pressure, velocity magnitude and radial velocity.
Also as obtained from velocity vectors diagram increasing the eccentric pipe
diameter has an effect of diverting the fluid entering to the second stage of crossed
flow. Totally increasing an eccentric pipe diameter decreases the hydraulic energy
inside the fluid interior for the given flow parameter, which implies that the
hydraulic energy changed to some other energy form, in our case to mechanical
power as obtained result from print result values of force moments.
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Mechanical Design Stream