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Figure 1-42 — Exhaust cycle. The elements of the exhaust cone assembly consist of an outer shell or duct, an inner cone, and three or four radial hollow struts or fins. Tie rods aid the struts in supporting the inner cone from the outer duct. The outer shell or duct, made of stainless steel, is attached to the rear flange of the turbine case. This element collects and delivers the exhaust gases. The gases flow either directly or through a tailpipe to the jet nozzle, depending on whether or not a tailpipe is required. There is no need for a tailpipe in some engines. For instance, the required engine-installation space in wing roots, pods, or wings is short and requires very little tailpipe. In which case the exhaust duct and exhaust nozzle will suffice. The construction of the duct includes such features as a predetermined number of thermocouple bosses for installing exhaust gas temperature thermocouples. Also, there must be insertion holes for the supporting tie rods. In some cases, there are no requirements for tie rods for supporting the inner cone from the outer duct shown in Figure 1-43. If such is the case, the hollow struts provide the sole support of the inner cone, the struts being spot-welded in position to the inside surface of the duct and to the inner cone, respectively. The radial struts actually have a twofold function. They not only support the inner cone in the exhaust duct, they also perform the important function of straightening the swirling exhaust gases, which otherwise would leave the turbine at an angle of about 45 degrees. If tie rods are required for inner cone support, these struts also form fairings around the rods. The centrally located inner cone fits rather closely against the rear face of the turbine disc. This fit prevents turbulence of the gases as they leave the turbine wheel. The cone is supported by the radial struts, which are usually vertical and horizontal in relation to the normal position of the engine. In some configurations, there is a small hole located in the exit tip of the cone shown in Figure 1-43. This hole allows cooling air to circulate from the exit end of the cone. The pressure of the gases is relatively high in the interior of the cone and against the face of the turbine wheel. 1-28 Figure 1-43 — Exhaust collector and welded support status.PDF Image | JET ENGINE THEORY AND DESIGN
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