FUEL SPRAY NOZZLE

A fuel spray nozzle 16 has a cylindrical spray block 18 with an inner air passage 17 for flow of nebulizing air 4' and a fuel injection valve 20 for injection of fuel intermediately of the inner air passage 17 in the spray block 18 at a flow rate adjusted by duty control. The nebulizing air is introduced into the spray block 18 through a base end of the block at a flow velocity of 9 m/s or more and blown out of an injection port 21 at a tip end of the block.