Spray nozzle

A fuel spray nozzle, for atomising liquid fuel in a gas, comprising:

• a gas passage;
• a swirler provided in the gas passage and comprising vanes configured to produce a jet flow of gas from between adjacent vanes and a turbulent flow of gas in a wake of each vane;
• a liquid fuel passage disposed radially outward of i) the gas passage and ii) the vanes and separated from the gas passage by a solid wall;
• and
• a prefilming surface disposed downstream of the vanes, the prefilming surface configured to receive liquid fuel from the liquid fuel passage, and to receive gas from the gas passage, wherein the prefilming surface comprises first areas configured to receive the jet flow of gas from the gas passage and second areas configured to receive the turbulent flow of gas from the gas passage,
• the fuel spray nozzle comprises apertures disposed downstream of the vanes and configured to control a supply of the liquid fuel to the liquid fuel passage, and the fuel spray nozzle is configured to direct the liquid fuel passing through the apertures and the liquid fuel passage to the first areas on the prefilming surface, and an angle of each of the apertures relative to a center line of the gas passage is the same as an angle of a surface of each of the vanes relative to the center line of the gas passage.