In-combustion chamber flow control device

An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises a plasma actuator disposed inside the combustion chamber, the plasma actuator comprising:

• a dielectric body disposed along a piston top surface of the piston of the engine;
• an exposed electrode disposed on one side of the dielectric body facing the combustion chamber;
• and an embedded electrode disposed on a side opposite to the exposed electrode across the dielectric body, the embedded electrode being disposed at a position closer to one end of the piston top surface on the side of an exhaust opening, than the exposed electrode.

An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises:

• a plasma actuator disposed along the ceiling surface of the combustion chamber, at a position closer to a center of the ceiling surface than the intake opening;
• and a control means to control the plasma actuator, wherein the control means is operable to control the plasma actuator to generate a flow flowing along the ceiling surface in a direction from the plasma actuator toward the intake opening, during an intake stroke of the engine.

An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises:

• a plasma actuator disposed along a piston top surface of the piston of the engine;
• and a control means to control the plasma actuator, wherein the control means is operable to control the plasma actuator to generate a flow flowing along the piston top surface in a direction from the plasma actuator toward one end of the piston top surface on the side of an exhaust opening, during an intake stroke of the engine.