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Analytical Investigation to Predict the Intake pipe Diameter in Naturally Aspirated Internal Combustion Engine

Author(s): Mahmoud A. Mashkour

Journal: Journal of Applied Sciences
ISSN 1812-5654

Volume: 12;
Issue: 2;
Start page: 161;
Date: 2012;
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Keywords: Internal combustion engine | volumetric efficiency | intake pipe | induction system

An analytical solution to estimate the effective diameter of a naturally aspirated internal combustion engine intake pipe is presented in this paper. A formula to predict the effective diameter for the geometry of the intake pipe as a function of cylinder bore, stroke, engine speed, pipe length, ambient temperature and aerodynamic losses, is created. In this analysis, the kinetic energy of a charge column in the period of a filling cylinder and the maximum kinetic energy are taken into consideration. A comparison between the results of the novel suggested formula and the actual published work to determine the intake pipe diameter is done for different engines. The results indicated that a good agreement to estimate the intake pipe diameter, especially in high-speed engines is obtained.
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