Izvorni znanstveni članak
https://doi.org/10.30765/er.40.1.08
Performance investigation of a volute porous tongue of a turbocharger turbine
Abderrahmane Chachoua
; Department of mechanical engineering, Faculty of mechanical engineering, University of Sciences and Technologies Mohamed Boudiaf of Oran, El Mnaouar, BP 1505, Bir El Djir 31000, Algeria
Mohamed Kamal Hamidou
; Department of mechanical engineering, Faculty of mechanical engineering, University of Sciences and Technologies Mohamed Boudiaf of Oran, El Mnaouar, BP 1505, Bir El Djir 31000, Algeria
Mohammed Hamel
; Department of mechanical engineering, Faculty of mechanical engineering, University of Sciences and Technologies Mohamed Boudiaf of Oran, El Mnaouar, BP 1505, Bir El Djir 31000, Algeria
Sažetak
The design for better performance of the spiral housing volute used commonly in radial and mixed inflow gas turbines is of prime importance as it affects the machine stage at both design and off design conditions. The tongue of the scroll divides the flow into two streams, and represents a severe source of disturbances, in terms of thermodynamic parameter uniformity, maximum kinetic energy, the right angle of attack to the rotor and minimum losses. Besides, the volute suffers an undesirable effect due to the recirculating mass flow rate in near bottom vicinity of the tongue. The present project is an attempt to design a tongue fitted with cylindrical holes traversing normal to the stream wise direction, where on account of the large pressure difference between the top and the bottom sides of the tongue will force the recirculating flow to go through the rotor inlet. This possibility with its limitations has not yet been explored. A numerical simulation is performed which might provide our suitable objectives. To achieve this goal the ANSYS code is used to build the geometry, generate the mesh, and to simulate the flow by solving numerically the averaged Navier Stokes equations. Apparently, the numerical results show evidence of favorable impact in using porous tongue. The realization of a contact between the main and recirculation flow by drilled holes on the tongue surface leads to a flow field uniformity, a reduction in the magnitude of the loss coefficient, and a 20 % reduction in the recirculating mass flow rate.
Ključne riječi
volute; scroll; tongue; mixed inflow turbine; ANSYS-CFX
Hrčak ID:
232827
URI
Datum izdavanja:
27.1.2020.
Posjeta: 1.602 *