Technical Brief

Theoretical and Experimental Analysis of the Steady Flow Across the Cylinderhead of a Low-Capacity Engine

[+] Author and Article Information
A. Castilla

Deutz Spain S.A.,
Zafra, E-06300, Spain

M. Rubio, C. Ferrera, J. M. Montanero

Depto. de Ingeniería Mecánica,
Energética y de los Materiales,
Universidad de Extremadura,
Badajoz E-06006, Spain

J. Fernández

Dpto. de Energía,
Escuela Politécnica de Mieres,
Universidad de Oviedo,
Mieres E-33600, Spain

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received March 31, 2016; final manuscript received September 1, 2016; published online September 27, 2016. Assoc. Editor: Kenji Takizawa.

J. Appl. Mech 83(12), 124501 (Sep 27, 2016) (4 pages) Paper No: JAM-16-1164; doi: 10.1115/1.4034619 History: Received March 31, 2016; Revised September 01, 2016

The air flow that crosses the cylinderhead of a low-capacity engine is studied both theoretically and experimentally in the steady regime. We analyze the dependence of both the discharge coefficient and swirl number on the Reynolds number and valve lift. The formation of the turbulent vortex in the cylinder is described by measuring the 2D velocity distribution over several cylinder cross sections. The integration of the Reynolds-averaged Navier–Stokes (RANS) equations reproduces satisfactorily the experimental data, especially the swirl number values.

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Grahic Jump Location
Fig. 1

(Left) Sketch and parameters of the problem. (Right-top) Coordinate system for the PIV measurements (the gray circle represents the inlet valve). (Right-bottom) Elements of the geometrical configuration.

Grahic Jump Location
Fig. 2

(Left) α and S for the valve lift 7 mm as a function of the Reynolds number. The solid and open symbols correspond to the cylinderhead analyzed in this work and another similar cylinderhead, respectively. (Right) Vortex coordinates xv* and yv* as a function of the Reynolds number for the valve lift 8 mm and the distance Z = 70 mm from the cylinderhead.

Grahic Jump Location
Fig. 3

α (left) and S (right) as a function of the valve lift. The experimental data are the average over the measurements for the four cylinders of 19 cylinderheads manufactured in series. The error bars are the corresponding standard deviations.

Grahic Jump Location
Fig. 4

Average velocity field measured with our PIV system at a distance Z = 70 mm for the valve lifts 4, 6, 7, 8, 10, and 12 mm. The labels and the arrows indicate the valve lifts and the vortex center positions, respectively.

Grahic Jump Location
Fig. 5

(From top to bottom) Average velocity field for Z = 15, 25, 35, and 70 mm and the valve lift 12 mm obtained experimentally (left-hand plots) and numerically (right-hand plots). The arrows approximately indicate the vortex center.

Grahic Jump Location
Fig. 6

(Left) Coordinates xv* (triangles) and yv* (circles) of the vortex center as a function of the distance Z from the cylinderhead for the valve lift 12 mm. (Right) Vortex positions in the cylinder. The red, green, and blue lines in the left-hand (right-hand) image correspond to the valve lifts 4, 6, and 7 mm (8, 10, and 12 mm), respectively. The line thickness indicates the experimental uncertainty. The circle plotted at the cylinder bottom indicates the inlet valve position.



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