Turbine exhaust plenum
In accordance with one embodiment, a system includes a turbine engine including an axial-radial diffuser section disposed about a first longitudinal axis downstream in an exhaust flow path from a turbine section. The system also includes an exhaust plenum including a first plenum portion disposed about the axial-radial diffuser section, wherein the first plenum portion includes a curved wall portion that diverges away from a circumference of the axial-radial diffuser section. The exhaust plenum also includes a second plenum portion extending away from the first plenum portion downstream along a second longitudinal axis of the exhaust plenum approximately crosswise to the first longitudinal axis.
1. A system, comprising:
a turbine exhaust plenum, comprising:
a first plenum portion comprising an axial-radial diffuser receptacle having a first axis approximately crosswise to a second axis extending lengthwise along the turbine exhaust plenum, wherein the first plenum portion comprises a curved wall portion that diverges away from the first axis along a curved path in a first direction approximately crosswise to the first and second axes, the first plenum portion comprises first and second wall portions offset from one another along the first axis, the first and second wall portions diverge from one another in the first direction, and the first and second axes are offset from one another by an offset distance; and
a second plenum portion extending away from the first plenum portion downstream along the second axis of the exhaust plenum, wherein the first and second wall portions extend along the second plenum portion, the first and second wall portions diverge from one another in a second direction along the second axis toward the second plenum portion in both the first and second plenum portions, and the first wall portion extends parallel to the second axis in both the first and second directions in both the first and second plenum portions.
2. The system of claim 1 , wherein the first and second wall portions comprise diverging flat wall portions.
3. The system of claim 1 , wherein the curved wall portion diverges away from the first axis from a first region to a second region, and a flow splitter extends between the axial-radial diffuser receptacle and the exhaust plenum in the first region, the flow splitter being aligned with a center point of the axial-radial diffuser receptacle along a midplane through the axial-radial diffuser receptacle that extends through the first and second axes.
4. The system of claim 1 , wherein the curved wall portion diverges away from the first axis in the first direction from the first axis toward the second axis.
5. The system of claim 1 , wherein the first and second wall portions diverge from one another in the first direction in both the first and second plenum portions at an approximately 1 degree angle, and the first and second wall portions diverge in the second direction in both the first and second plenum portions at an approximately 2 degree angle.
6. A system, comprising:
a turbine exhaust plenum, comprising:
a first plenum portion comprising an axial-radial diffuser receptacle having a first axis approximately crosswise to a second axis extending lengthwise along the turbine exhaust plenum, wherein the first plenum portion comprises a curved wall portion that diverges away from the first axis along a curved path in a first direction approximately crosswise to the first and second axes, the first and second axes are offset from one another by an offset distance, and the curved wall portion diverges away from the first axis in the first direction from the first axis toward the second axis; and
a second plenum portion extending away from the first plenum portion in a second direction along the second axis of the exhaust plenum, wherein the second plenum portion comprises first and second wall portions offset from one another, and the first wall portion extends parallel to the second axis in both the first and second directions, while the second wall portion diverges from the first wall portion in both the first and second directions.
7. The system of claim 6 , wherein the first and second wall portions are offset from one another in a third direction along the first axis.
8. The system of claim 7 , wherein the second wall portion diverges from the first wall portion at an approximately 1 degree angle in the first direction and at an approximately 2 degree angle in the second direction.
9. A system, comprising:
a turbine exhaust plenum, comprising:
a first plenum portion comprising an axial-radial diffuser receptacle having a first axis approximately crosswise to a second axis extending lengthwise along the turbine exhaust plenum, wherein the first plenum portion comprises a curved wall portion that diverges away from the first axis along a curved path in a first direction approximately crosswise to the first and second axes, the first plenum portion comprises first and second wall portions offset from one another along the first axis, and the first and second wall portions diverge from one another in the first direction; and
a second plenum portion extending away from the first plenum portion downstream along the second axis of the exhaust plenum, and wherein the first and second wall portions diverge in a second direction along the second axis toward the second plenum portion, the first and second wall portions extend along the second plenum portion, the first and second wall portions diverge from one another in the first direction in both the first and second plenum portions at an approximately 1 degree angle, and the first and second wall portions diverge in the second direction in both the first and second plenum portions at an approximately 2 degree angle.