Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   MARCH 2017 , Volume 16 , Number 12 #F0074; Page(s) 692 To 702.
 
Paper: 

MODELING INSTANTANEOUS ENERGY EXCHANGE DURING RIGID INTERACTION OF ROTOR WITH UNSTEADY WATER FLOW AROUND DUCT OF AXIAL TIDAL TURBINES

 
Author(s):  ZAHEDI NEJAD ALI, RAD MANOUCHER*
 
* DEPARTMENT OF MECHANICAL AND AEROSPACE ENGINEERING, SCIENCE AND RESEARCH BRANCH, ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

For prediction instantaneous energy absorption by axial tidal turbines in the unsteady water flow a numerical analytical modeling approach has been presented. The purpose of the present article is introducing a fast and stable integral solution method with unique response. This method uses data of computational fluid dynamics in the steady flow to approximate time-dependent performance of axial tidal turbine in the unsteady external flows. This solution method has been designed for modeling axial tidal turbine with convergent-divergent duct in water flow with unsteady boundary conditions. The governing equations for fluid flow have been obtained in the form of integral equations. The equation of one-degree of freedom motion of rotor has been solved with fourth-order Runge-Kutta method and variations of parameters method. CFD data for rotor and duct of axial tidal turbine have been inserted as boundary values in the integral equations of fluid flow. Two time dependent analytical equations were employed for approximation of rotor torque and back pressure coefficient of tidal turbine. The results of the integral solution method have been compared with time-dependent CFD data in ANSYS-Fluent software. Several numerical simulations were carried out with the presented procedure to determine dimensions of the duct for the most enhancement of power absorption in an axial tidal turbine.

 
Keyword(s): DUCT, DYNAMIC SIMULATION, INTEGRAL EQUATIONS, TIDAL TURBINE, UNSTEADY FLOW
 
References: 
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