Fuel injector with purged insulating air cavity

摘要

A fuel injector (30) includes a flow path for fuel air mixture to a combustor (50) extending longitudinally through the fuel injector. The fuel injector may also include a liquid fuel gallery (56) at least partially encircling the flow path. The gallery may include a plurality of fuel spokes (54a- 54e) configured to deliver liquid fuel from the gallery to the flow path. The fuel injector may also include an annular outer housing (47) circumferentially positioned about the gallery to form an insulating air cavity (60) at least partially around the gallery. The outer housing may include at least one purge hole (62a, 62b, 62c) to provide communication between the insulating air cavity and outside the outer housing of the injector.