배충식 교수

An experimental study was performed to evaluate the effect of pintle lift on spray characteristics of piezo-actuated outward-opening injector for a direct-injection spark-ignition engine. Spray characteristics, including spray structure, development process and geometric indexes, were investigated by the macroscopic and microscopic spray visualization in a constant volume chamber. The injection rate was measured by the Bosch method to evaluate the flow rate and response characteristics of the in

A technique for estimating the instantaneous frictional force between the piston assembly and the cylinder wall has been developed by improving the moveable bore technique. The technique can be easily applied to small multi-cylinder engines since its structure is simple and stable so that the measuring range could be extended. The reliability of the friction data can be improved by a newly-proposed compensation method. The technique was applied to a four cylinder SI engine under various engine s

Design of experiments (DOE) technique has been used to design an exhaust heat exchanger to reduce the exhaust gas temperature under high load conditions in a spark-ignition engine. The DOE evaluates the influence and the interaction of a selected eight design parameters of the heat exchanger affecting the cooling performance of the exhaust gas through a limited number of experiments. The heat exchanger was installed between the exhaust manifold and the inlet of the close-coupled catalytic conver