The Design – How to make Perfect Supercharger Lobes in Simulation | ANSYS CFX
The Roots-type blower is a positive displacement lobe pump that operates by pumping a fluid with a pair of meshing lobes resembling a set of stretched gears. The fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust. The most common application of the Roots-type blower has been as the induction device on two-stroke diesel engines, such as those produced by Detroit Diesel and Electro-Motive Diesel. Roots-type blowers are also used to supercharge Otto-cycle engines, with the blower being driven from the engine’s crankshaft via a toothed or V-belt, a roller chain, or a gear train.
The Roots-type blower is named after American inventors and brothers Philander and Francis Marion Roots, founders of the Roots Blower Company of Connersville, Indiana USA, who patented the basic design in 1860 as an air pump for use in blast furnaces and other industrial applications. In 1900, Gottlieb Daimler included a Roots-style blower in patented engine design, making the Roots-type blower the oldest of the various designs now available. Roots blowers are commonly referred to as air blowers or PD (positive displacement) blowers and can be commonly called “huffers” when used with the gasoline-burning engines in hot rod customized cars.
In this analysis, it has been tried to analyze how to make perfect supercharger lobes in simulation, using the ANSYS CFX software.
Geometry & Grid
The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 320,41 mm³.
In this analysis, a transient analysis type was used to obtain the results to check the fluid flow. In this analysis, non-buoyant models have been used and stationary domain motion has also been activated in this analysis.
The turbulence boundary condition of a supercharger lobes wall is considered to be shear stress transport according to the working conditions. The wall function is defined as automatic in the name selection section of turbulence boundary conditions. The static pressure for the design modeler is set as relative pressure equal to 1 atm.
Discretization of Equations
In this analysis, high-resolution is used for the advection scheme of the basic settings. In this analysis, the first-order is used for turbulence numerics. In this analysis, the residual type of convergence criteria is RMS and the residual target of convergence criteria is 1.E-4.
The results are presented as pressure contours as well as streamlines.
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