Energy recovery ducted turbine (ERDT) system for chimney flue gases - A CFD based analysis to study the effect of number of blade and diffuser angle
2020
Mann, Harjeet S. | Singh, Pradeep K.
Extraction of kinetic energy from the chimney flue gases for power generation using ducted turbine system is an innovative idea. This paper presents a comprehensive study on the Energy Recovery Ducted Turbine System (ERDT) system for power generation. Computational Fluid Dynamics (CFD) based analysis has been carried out to study the effect of number of blades and diffuser angle on the performance of the system. The Reynolds Averaged Navier-Stokes (RANS) modeling approach and finite volume numerical method has been used to solve the governing equations. The numerical simulations have been attempted to investigate the flow through the ERDT system, using the ANSYS-CFX with the standard k−ε turbulence model. Two airfoil shapes NACA4412 and NACA4416 have been considered for the turbine blades. Results show that the power output of the ERDT system improves with increase in the number of blades and the diffuser angle. The optimum simulated results that have obtained for both the types of airfoil correspond to diffuser angle, θ = 11° & 12° for the whole range of number of blades. The maximum power obtained for same setup is 12.05 kW and 18.01 kW for airfoil NACA4412 and NACA4416 respectively. Thus, the proposed ERDT system appears to be quite useful to recover the waste kinetic energy in the chimney flue gases. The system can have good market potential due to abundant chimneys and other unnatural exhaust wind resources available globally.
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