Numerical Study of the Flow Within a Vanned Volute of a Mixed Flow Turbine
Issue:
Volume 3, Issue 5, October 2017
Pages:
46-51
Received:
10 October 2017
Accepted:
23 October 2017
Published:
25 November 2017
Abstract: A turbocharger is commonly used to get more available output power for internal combustion engines. The radial turbine recovers the engine exhaust gas energy and converts it into rotational energy. The turbocharger turbine consists mostly in a radial or mixed flow impeller and a volute. The turbocharger volute transforms a part of the engine exhaust gas energy into a kinetic energy and guides the movement towards the rotor inducer at a suitable flow angle. The main purpose of this paper is to study the flow structure within a vanned volute of a mixed flow turbine. For this end, numerical simulations are conducted by solving the Navier-Stokes equations using the commercial Computational Fluid dynamiX (CFX) package and including a finite volume discretization method. The reasonable agreement found between experimental and numerical results of the turbine performance confirms the accuracy of the numerical model. The distributions of the pressure, the velocity, and the turbulence characteristics are numerically obtained in this analysis. The results showed that the fluid flow within the turbine volute is highly turbulent. Moreover, a significant pressure damp has been recorded within the volute vane which leads to a low-pressure flow at the rotor entry. Also, it has been shown that the flow direction considerably turns from the radial direction to the tangential one across the volute casing.
Abstract: A turbocharger is commonly used to get more available output power for internal combustion engines. The radial turbine recovers the engine exhaust gas energy and converts it into rotational energy. The turbocharger turbine consists mostly in a radial or mixed flow impeller and a volute. The turbocharger volute transforms a part of the engine exhaus...
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Exact Solution of an MHD Natural Convection Flow in Vertical Concentric Annulus with Heat Absorption
Issue:
Volume 3, Issue 5, October 2017
Pages:
52-61
Received:
8 March 2017
Accepted:
30 March 2017
Published:
28 November 2017
Abstract: This paper presents an exact solution of a fully developed natural convection flow in a vertical concentric annulus in the presence of transverse magnetic field and heat absorption. The non-dimensional form of the equation governing the flow is first obtained and then the unified analytical solutions for the temperature field, velocity field, and skin-frictions as well as rate of heat transfer are obtained for both isothermal and constant heat flux case on the outer surface of the inner cylinder. The effect of various identified governing parameters on the flow was illustrated with the aid of line graphs. It is found that the magnitude of maximum fluid velocity is greater in the case of isothermal heating compared with the constant heat flux case when the gap between the cylinders is less or equal to radius of the inner cylinder. More also, the various values of the non-dimensional heat absorption parameter (H) and the corresponding values of annular gap where these fields are almost the same are presented in table 1.
Abstract: This paper presents an exact solution of a fully developed natural convection flow in a vertical concentric annulus in the presence of transverse magnetic field and heat absorption. The non-dimensional form of the equation governing the flow is first obtained and then the unified analytical solutions for the temperature field, velocity field, and s...
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