various functions, each of the components affects the flow  of gases in different ways. The exhaust section is located  directly behind the turbine section and ends when the gases  are ejected at the rear in the form of a high-velocity exhaust  gases. The components of the exhaust section include the  exhaust cone, tailpipe (if required), and the exhaust nozzle.  The exhaust cone collects the exhaust gases discharged from  the turbine section and gradually converts them into a solid  flow of gases. In performing this, the velocity of the gases is  decreased slightly and the pressure increased. This is due to  the diverging passage between the outer duct and the inner  cone; that is, the annular area between the two units increases  rearward. The exhaust cone assembly consists of an outer  shell or duct, an inner cone, three or four radial hollow struts  or fins, and the necessary number of tie rods to aid the struts  in supporting the inner cone from the outer duct. The outer shell or duct is usually made of stainless steel and  is attached to the rear flange of the turbine case. This element  collects the exhaust gases and delivers them directly to the  exhaust nozzle. The duct must be constructed to include such  features as a predetermined number of thermocouple bosses  for installing exhaust temperature thermocouples, and there  must also be insertion holes for the supporting tie rods. In  some cases, tie rods are not used for supporting the inner  cone. 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.  [Figure 1-73]  The radial struts actually have a  twofold function. They not only support the inner cone in the  exhaust duct, but they also perform the important function of  straightening the swirling exhaust gases that would otherwise  leave the turbine at an angle of approximately 45°. and high pressure (high pressure compressor shaft and high  pressure turbine).  [Figure 1-7] The remaining element to be discussed concerning turbine  familiarization is the turbine casing or housing. The turbine  casing encloses the turbine wheel and the nozzle vane  assembly, and at the same time gives either direct or indirect  support to the stator elements of the turbine section. It always  has flanges provided front and rear for bolting the assembly  to the combustion chamber housing and the exhaust cone  assembly, respectively. A turbine casing is illustrated in  Figure 1-72 . The centrally located inner cone fits rather closely against  the rear face of the turbine disk, preventing turbulence of the  gases as they leave the turbine wheel. The cone is supported  by the radial struts. In some configurations, a small hole is  located in the exit tip of the cone. This hole allows cooling  air to be circulated from the aft end of the cone, where the  The exhaust section of the gas turbine engine consists  of several components. Although the components have  individual purposes, they also have one common function:  they must direct the flow of hot gases rearward in such a  manner as to prevent turbulence and, at the same time, impart  a high final or exit velocity to the gases. In performing the  Exhaust Section 1-52 Figure 1-70. Multirotor turbine. Figure 1-69. Single-stage rotor turbine. Figure 1-72. Turbine casing assembly. Figure 1-71. Dual-rotor turbine for split-spool compressor. 