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Research Papers: Fuel Combustion

The Effect of the Helical Inlet Port Design and the Shrouded Inlet Valve Condition on Swirl Generation in Diesel Engine

[+] Author and Article Information
Saleh Abo-Elfadl

Department of Mechanical Engineering,
Faculty of Engineering,
Assiut University,
Assuit 71516, Egypt
e-mail: sa-fadl@aun.edu.eg

A. Abd El-Sabor Mohamed

Department of Mechanical Engineering,
Faculty of Engineering,
Assiut University,
Assuit 71516, Egypt
e-mail: eng_ahmedabdelsabor@aun.edu.eg

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 24, 2017; final manuscript received September 16, 2017; published online October 4, 2017. Assoc. Editor: Stephen A. Ciatti.

J. Energy Resour. Technol 140(3), 032203 (Oct 04, 2017) (9 pages) Paper No: JERT-17-1242; doi: 10.1115/1.4037941 History: Received May 24, 2017; Revised September 16, 2017

Inlet port design has a great influence on swirl generation inside the engine cylinder. In this paper, two helical inlet ports having the same helix design were suggested. The first has an upper entrance, and the second has a side entrance. With the two ports, shrouded inlet valves having different conditions of shroud and orientation angles were used. Four shroud angles were used; they are 90 deg, 120 deg, 150 deg, and 180 deg. Also, four orientation angles were used; they are 0 deg, 30 deg, 60 deg, and 90 deg. Three-dimensional simulation model using the shear stress transport k–ω model was used for predicting the air flow characteristics through the inlet port and the engine cylinder in both intake and compression strokes. The results showed that the side entrance port produces swirl ratio higher than that of the upper entrance port by about 3.5%, while the volumetric efficiency is approximately the same for both ports. For both the ports, increasing the valve shroud angle increases the swirl ratio and reduces the volumetric efficiency. The maximum increments of swirl ratio relative to the ordinary valve case occur at valve conditions of 30–150 deg, 0–180 deg, and 30–180 deg. At these valve conditions, the swirl ratio values are 6.38, 6.72, and 6.95 at intake valve close (IVC) with percentage increments of 69.2%, 78.2%, and 84.4%, respectively. The corresponding values of the volumetric efficiency are 93.6, 92.5, and 91.2, respectively, with percentage decrements of 2.84%, 4%, and 5.7%, respectively.

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Figures

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Fig. 1

(a) Helical port with upper entrance and (b) helical port with side entrance

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Fig. 2

The inlet valve, the shroud angle α, and the orientation angle β

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Fig. 3

Radial velocity at the valve exit

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Fig. 4

Axial velocity distribution 15 mm apart the cylinder head

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Fig. 5

Air mass flow rate through the intake stroke

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Fig. 6

Cylinder charge mass through the intake stroke

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Fig. 7

Swirl ratio variations using inlet valve having 150 deg shroud angle

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Fig. 8

Velocity contours and streamlines at different horizontal planes

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Fig. 9

Swirl ratio at IVC and at start of injection

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Fig. 10

Percentage increment of swirl ratio at IVC and at start of injection

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Fig. 11

Volumetric efficiency at different shroud and orientation angles

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Fig. 12

Swirl ratio and volumetric efficiency percentage variations

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Fig. 13

The velocity vectors through the two helical inlet ports with valve condition of 30–150 deg

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Fig. 14

Swirl ratio values at IVC for upper and side entrance ports

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