TECHNICAL PAPERS: Internal Combustion Engines

Influence of Valve Lift and Throttle Angle on Intake Flow in a High-Performance Four-Stroke Motorcycle Engine

[+] Author and Article Information
Angelo Algieri

Mechanics Department, University of Calabria, 87030 Arcavacata di Rende (CS), Italya.algieri@unical.it

Sergio Bova

Mechanics Department, University of Calabria, 87030 Arcavacata di Rende (CS), Italys.bova@unical.it

Carmine De Bartolo

Mechanics Department, University of Calabria, 87030 Arcavacata di Rende (CS), Italyc.debartolo@unical.it

The port Reynolds number is defined as the Reynolds number calculated at the intake port. More details are given in (12,28).

J. Eng. Gas Turbines Power 128(4), 934-941 (Jan 09, 2006) (8 pages) doi:10.1115/1.2180277 History: Received April 27, 2005; Revised January 09, 2006

A high-performance four-stroke motorcycle engine was analyzed at a steady flow rig. The aim of the work was to characterize the fluid dynamic behavior of the engine head during the intake phase. To this purpose a twofold approach was adopted: the dimensionless flow coefficient was used to evaluate the global breathability of the intake system, while the laser doppler anemometry (LDA) technique was employed to define the flow structure within the combustion chamber. The analysis gave evidence of two contrarotating vortices with axes parallel to the cylinder axis and showed variations in the flow structure when moving away from the engine head. Furthermore, the study highlighted the great influence of the throttle angle on the head fluid dynamic efficiency and how this influence changes with the valve lift. Experimental data were correlated by a single curve adopting a new dimensionless plot. Moreover, LDA measurements were used to evaluate the angular momentum of the flux and an equivalent swirl coefficient, and to correlate them to a previous global swirl characterization carried out on the same engine head using an impulse swirl meter.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 2

Experimental setup

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Figure 3

LDA analysis: measurement locations

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Figure 4

Effect of the valve lift on head breathability, WOT configuration

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Figure 5

Effect of the throttle angle on head breathability

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Figure 6

Influence of the throttle angle on head breathability for four dimensionless valve lift

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Figure 7

Flow coefficient contour plot

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Figure 8

Unique trend in the flow coefficient

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Figure 9

Dimensionless plot for different engines

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Figure 10

Velocity vectors on the middle plane (H∕B=1∕2)

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Figure 11

Velocity vectors on lower and higher measuring plane

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Figure 12

LDA analysis: tangential and rms velocity on the three measuring planes

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Figure 13

LDA and swirl measurements correlation




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