Duct with transition section for turbine exhaust

Abstract

An exhaust duct for a gas turbine includes a transition section having an inlet for receiving turbine exhaust gas and a relatively larger outlet for interfacing with an auxiliary section housing an auxiliary device. The transition section has an interior surface extending from the inlet to the outlet. The interior surface has a segment generally adjacent to the inlet that is curved to induce a Coanda effect in which the turbine exhaust gas is caused to flow along said curved surface and to expand for distribution of the turbine exhaust gas over the auxiliary device in the auxiliary section.

1 . An exhaust duct for a gas turbine comprising:
 a transition section having a top wall, a first side wall, a second side wall, and a bottom wall, said transition section having an intake for receiving turbine exhaust gas and a relatively larger outlet area for interfacing with a larger duct area;   wherein at least one of said top wall, said first side wall, said second side wall and said bottom wall has a first segment adjacent to the intake that defines a first curved surface that increases in slope toward the outlet area, and a second segment adjacent to the outlet area that defines a second curved surface that decreases in slope toward the outlet area and levels off at the outlet area to interface with the larger duct area.   
     
     
         2 . The exhaust duct set forth in  claim 1 , further comprising a larger duct area interfaced with the outlet area of the transition section, wherein the larger duct area includes an auxiliary section housing at least one of a catalyst, a silencer panel, and a perforated plate. 
     
     
         3 . The exhaust duct set forth in  claim 2 , in combination with a gas turbine, wherein the gas turbine is directly connected to the transition section at the intake. 
     
     
         4 . The exhaust duct set forth in  claim 2 , in combination with a gas turbine and a diffuser downstream of the gas turbine, wherein the diffuser is directly connected to the transition section at the intake. 
     
     
         5 . An exhaust duct for a gas turbine comprising:
 a transition section having an inlet for receiving turbine exhaust gas and a relatively larger outlet, the transition section including at least one wall defining an interior surface having a concave segment generally adjacent to the inlet and extending away from the inlet, and a convex segment generally adjacent to the outlet extending toward the outlet.   
     
     
         6 . An exhaust duct for a gas turbine comprising:
 a transition section having an inlet for receiving turbine exhaust gas, and a relatively larger outlet for interfacing with an auxiliary section housing an auxiliary device,   wherein the transition section has an interior surface extending from the inlet to the outlet, the interior surface having a segment generally adjacent to the inlet that is curved to induce a Coanda effect in which said turbine exhaust gas is caused to flow along said curved surface and to expand for distribution of the turbine exhaust gas over the auxiliary device in the auxiliary section.