An airblast fuel injection nozzle for a gas turbine engine comprising: a fuel distributor with a fluid inlet , and fluid outlet , and a fluid circuit for fluid communication between the fluid inlet and the fluid outlet, wherein the fluid circuit includes a passage defined along a cone; wherein the fuel distributor includes an outer distributor ring and an inner distributor ring mounted within the outer distributor ring; wherein the outer distributor ring includes an internal conical surface and the inner distributor ring includes an outer conical surface , wherein a helically threaded fluid passage is defined on at least one of the internal conical surface of the outer distributor ring and the outer conical surface of the inner distributor ring; wherein the fluid circuit is defined between a helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring, or wherein the fluid circuit is defined between a helically threaded fluid passage of the outer conical surface of the inner distributor ring and an internal conical surface of the outer distributor ring; wherein the helically threaded fluid passage is a multiple-start helically threaded fluid passage with multiple helical threads; an inner heat shield mounted inboard of the inner distributor ring for thermal isolation of fuel in the fuel distributor from compressor discharge air inboard of the inner heat shield ; a core air swirler mounted inboard of the inner heat shield for swirling compressor discharge air inboard of the fuel distributor for atomizing fuel from the fuel distributor ; and an outer heat shield assembly mounted outboard of the outer distributor ring for thermal isolation of fuel in the fuel distributor from compressor discharge air outboard of the inner heat shield and defining an outer air circuit configured and adapted to issue a swirl-free flow of air converging towards a central axis of the nozzle. a fuel distributor with a fluid inlet , and fluid outlet , and a fluid circuit for fluid communication between the fluid inlet and the fluid outlet, wherein the fluid circuit includes a passage defined along a cone; wherein the fuel distributor includes an outer distributor ring and an inner distributor ring mounted within the outer distributor ring; wherein the outer distributor ring includes an internal conical surface and the inner distributor ring includes an outer conical surface , wherein a helically threaded fluid passage is defined on at least one of the internal conical surface of the outer distributor ring and the outer conical surface of the inner distributor ring; wherein the fluid circuit is defined between a helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring, or wherein the fluid circuit is defined between a helically threaded fluid passage of the outer conical surface of the inner distributor ring and an internal conical surface of the outer distributor ring; wherein the helically threaded fluid passage is a multiple-start helically threaded fluid passage with multiple helical threads; an inner heat shield mounted inboard of the inner distributor ring for thermal isolation of fuel in the fuel distributor from compressor discharge air inboard of the inner heat shield ; a core air swirler mounted inboard of the inner heat shield for swirling compressor discharge air inboard of the fuel distributor for atomizing fuel from the fuel distributor ; and an outer heat shield assembly mounted outboard of the outer distributor ring for thermal isolation of fuel in the fuel distributor from compressor discharge air outboard of the inner heat shield and defining an outer air circuit configured and adapted to issue a swirl-free flow of air converging towards a central axis of the nozzle. <EOS>