AIR COOLING SYSTEM FOR SMALL INTERNAL COMBUSTION ENGINE EXPERIMENTAL ANALYSIS. 2001-01-1791
In this work we illustrate a data acquisition system realization and set up for the experimental description of an air cooling system for a four stroke, one - cylinder engine used on scooters.
The high importance of the power absorbed by cooling system at medium and high rotational speeds is the first reason of this investigation, our target is to point out possible increasing in the forced ventilation cooling system performances.
First of all, in order to foresee the magnitude order of the measured variables, we developed a theoretical one-dimensional description of the centrifugal blower, with this approach we can forecast, even if in an approximated way, the measured variables magnitude order.
Obviously, in order to realize the blower and flow experimental characterization, it was necessary the choice of the right test rig. Through the experimental data analysis we had interesting informations on blower real running conditions and on cooling air flow behaviour inside the cowling, which directs the air coming from the blower around the main engine parts.
This cooling system preliminary characterization is made with the help of an electric brake joined with the engine axis. So we could evaluate the cooling system behaviour, in particular the efficiency, in various engine load conditions and have the necessary data for the second fluid dynamic numerical analysis of cooling system.