Bassem Ramadan and his team from Kettering University use KIVA-3V
computational fluid dynamics software to model the intake and exhaust system for
their two-zone combustion system. "We simulate the flow through these intake
boards and look at the concentration of air in the cylinder to see if we have
created these two zones," says Ramadan. "The challenge is to prevent the two
zones from mixing before combustion occurs, and so far, we're finding that when
air and exhaust are in a swirling motion, mixing is delayed."
Pictured are the front and back view of a
half cylinder with air concentrations. Red indicates high air
concentration and blue indicates low air concentration. This engine
geometry shows a central intake valve in the cylinder head, and exhaust
ports attached to the side of the cylinder wall at the bottom. Air flows
through the central valve at the top, and exhaust flows into the cylinder
through the ports at the bottom.
This different engine geometry has a helical intake port/valve in the center of the cylinder head, and four exhaust ports/valves on the periphery of the cylinder. Air flows through the central intake port in a swirling motion, and exhaust flows into the cylinder through the four ports in the cylinder head. Both the central port and exhaust ports produce a swirling motion. Bassem Ramadan and his team at Kettering University have found that when both air and exhaust are swirling, mixing between the two is delayed during the compression
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