Research Papers: Internal Combustion Engines

Effect of Shroud and Orientation Angles of Inlet Valve on Flow Characteristic Through Helical–Spiral Inlet Port in Diesel Engine

[+] Author and Article Information
A. Abd El-Sabor Mohamed

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

Saleh Abo-Elfadl

Department of Mechanical Engineering,
Faculty of Engineering,
Assiut University,
Assiut 71516, Egypt
e-mail: salehaboelfadl2@gmail.com

Abd El-Moneim M. Nassib

Department of Mechanical Engineering,
Faculty of Engineering,
Assiut University,
Assiut 71516, Egypt
e-mail: amnassib@yahoo.com

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 23, 2016; final manuscript received March 30, 2017; published online April 25, 2017. Assoc. Editor: Nadir Yilmaz.

J. Eng. Gas Turbines Power 139(10), 102802 (Apr 25, 2017) (7 pages) Paper No: GTP-16-1596; doi: 10.1115/1.4036381 History: Received December 23, 2016; Revised March 30, 2017

The in-cylinder airflow motion is an important factor that severely affects combustion efficiency and emissions in diesel engines. It is greatly affected by the inlet port and valve geometries. A diesel engine cylinder with a helical–spiral inlet port is used in this study. An ordinary inlet valve and shrouded inlet valve having different shroud and orientation angles are used to study the shroud effect on the swirl and tumble motion inside the engine cylinder. Four shroud angles of 90 deg, 120 deg, 150 deg, and 180 deg are used. With each shroud angle, four orientation angles of 0 deg, 30 deg, 60 deg, and 90 deg are also used. Three-dimensional simulation model using the shear stress transport (SST) k–ω model is used for simulating air flow through the inlet port, inlet valve, and engine cylinder during both the intake and compression strokes. The results showed that increasing the valve shroud angle increases the swirl, and the maximum increase occurs at a valve shroud angle of 180 deg and orientation angle of 0 deg with a value of 80% with respect to the ordinary valve. But it decreases the volumetric efficiency, and the maximum decrement occurs at valve shroud of 180 deg and orientation angle of 90 deg with a value of 5.98%. Variations of the shroud and orientation angles have very small effect on the tumble inside the engine cylinder.

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Fig. 1

Solid body of the engine cylinder and inlet port

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Fig. 2

Location of inlet valve and angles α and β

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Fig. 3

Simulated and experimental axial flow velocity at (a) 10 mm and (b) 20 mm distance under the cylinder head

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Fig. 4

Swirl ratio variations using inlet valve having 90 deg shroud angle

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Fig. 5

Swirl ratio variations using inlet valve having 120 deg shroud angle

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Fig. 6

Swirl ratio variations using inlet valve having 150 deg shroud angle

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Fig. 7

Swirl ratio variations using inlet valve having 180 deg shroud angle

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Fig. 8

Velocity contours at different horizontal planes

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Fig. 9

Swirl ratio and volumetric efficiency percentage variations

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Fig. 10

Velocity vectors through xz plane at different crank angles

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Fig. 11

Tumble ratio variations through the intake and compression strokes at valve shroud 90 deg




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