<p>A combustion system provided with: a fuel tank; a pump for adding pressure to fuel supplied from the fuel tank; a first nozzle part for spraying the pressurized fuel in the combustion chamber; a supply pipe for coupling the first nozzle part and the pump, and through which the pressurized fuel flows; a connection part provided along the supply pipe near the first nozzle part; a supply unit for supplying water to the supply pipe via the connection part; and a second nozzle part interposed between the supply unit and the connection part for atomizing water and spraying in the connection part.</p>