|
Abstract: The three-dimensional steady flow numerical simulation is
studied in the carburetor and the cylinder system of the Model CUB100
four-stroke gasoline engine under maximum of valve lift. The
characteristic of the carburetor and the cylinder system compares the
carburetor plunger full-opened with semi-opened. The research results
reveal that a Lower pressure zone is formed round the carburetor nozzle,
the lower pressure in the carburetor plunger full-opened is lowest than
semi-opened, but the airflow velocity in the carburetor plunger
full-opened is bigger than semi-opened. The throat of a nozzle has the
maxi-mum velocity. The twin vortices is obvious in cylinder and inlet
pipe entrance. The asymmetry vortices is also obvious in the carburetor
plunger semi-opened. The asymmetric velocity still exists on the cross
section located the 2 diameter distance form cylinder head bottom. The
characteristic of pressure field is sameness with velocity field.
Key words: Flow field dynamics Engine Three-dimensional steady flow
Numerical simulation
CLC No: U464
国家973资助项目(001CB209207). Received 20040224, received in revised form
20040610
|