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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 2

Experimental setup

Grahic Jump Location
Figure 3

LDA analysis: measurement locations

Grahic Jump Location
Figure 4

Effect of the valve lift on head breathability, WOT configuration

Grahic Jump Location
Figure 5

Effect of the throttle angle on head breathability

Grahic Jump Location
Figure 6

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

Grahic Jump Location
Figure 7

Flow coefficient contour plot

Grahic Jump Location
Figure 8

Unique trend in the flow coefficient

Grahic Jump Location
Figure 9

Dimensionless plot for different engines

Grahic Jump Location
Figure 10

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

Grahic Jump Location
Figure 11

Velocity vectors on lower and higher measuring plane

Grahic Jump Location
Figure 12

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

Grahic Jump Location
Figure 13

LDA and swirl measurements correlation



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In