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DESIGN OF MINIATURE TURBOJET ENGINE 46 3.6 Fuel Distributer The purpose of the fuel distributor is to transport fuel from an outside source into the vaporization tubes of the combustion chamber. We chose a simple distributor designed similar to those seen in many small gas turbines. The distributor consists of eight, 0.08-inch diameter fuel injectors mounted normal to our 1⁄4 inch injector ring. Each injector is matched to a corresponding vaporization tube on the turbine side endcap of the combustion chamber. The injector ring sits on the outside of this endcap where it is held in place by the stator housing. Tubing connects to the ring which runs alongside the length of the combustion chamber and through the outer case of the engine. It is here where the distributor connects to an outside fuel source. The fuel distributor was manufactured entirely from 316 stainless steel tubing. We first cut and rolled the larger tubing to make the five-inch diameter injector ring. Next, we drilled eight 0.08-inch diameter holes in the injector ring to accommodate the fuel injectors. An additional hole was drilled perpendicular to these holes for the fuel supply line. We then cut eight, 0.08-inch diameter fuel injectors each 3 inches in length. We determined that conventional welding methods would not be feasible due to the small diameter and wall thickness of the tubing. Therefore, we decided to reach out to a local company with laser welding capabilities. They agreed to weld the assembly together and the resulting fuel distributor can be seen in Figure 15.PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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