Flame tube structure with cooling rib plates arranged in staggered mode

Abstract

The invention discloses a flame tube structure with cooling rib plates arranged in a staggered manner. At present, the highest wall surface temperature of the flame tube does not exceed 1200 K, the highest wall surface temperature is allowed to reach 1300 K in a short time, and the temperature of the surface of the flame tube in a large-area range should be about 1144 K, so that the service life is maximized. In the gas turbine experiment or whole machine operation process, a flame tube is prone to burning loss. The device comprises a front-end straight section, a contraction cone section and a rear-end straight section, the tail of the front-end straight section is welded to the large-diameter end of the contraction cone section, the head of the front-end straight section is fixed to the head of a combustion chamber, and the small-diameter end of the contraction cone section is welded to the rear-end straight section; and a plurality of circles of cooling rib plates are fixed on the outer ring surface of the shrinkage cone section and are axially arranged along the shrinkage cone section. The device is used for flame tube wall surface cooling.

Description

Technical Field

[0001] The invention relates to a flame tube structure with staggered cooling ribs. Background Art

[0002] The fuel combustion process in the gas turbine combustion chamber occurs in the flame tube. The high-temperature airflow generated by the combustion washes the inner wall of the flame tube. At the same time, the combustion zone radiates a large amount of heat load to the flame tube wall, which causes the inner wall temperature of the flame tube to be relatively high. At present, the maximum wall temperature of the flame tube shall not exceed 1200 K. The maximum wall temperature is allowed to reach 1300 K in a short time. The temperature of a large area of ​​the flame tube surface should be around 1144 K to maximize the service life. During the gas turbine experiment or the whole machine operation process, the flame tube is prone to burnout. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problems and provides a flame tube structure with staggered cooling ribs. The structure increases the wall turbulence intensity and reduces the generation of trapped vortex by reasonably arranging the ribs on the outer wall of the flame tube, thereby greatly improving the cooling efficiency of the flame tube wall.

[0004] The above purpose is achieved through the following technical solutions: A flame tube structure with staggered cooling ribs, comprising a front straight section, a contraction cone section and a rear straight section, wherein the tail of the front straight section is welded to the large diameter end of the contraction cone section, the head of the front straight section is fixed to the head of the combustion chamber, and the small diameter end of the contraction cone section is welded to the rear straight section; A plurality of circles of cooling ribs are fixed on the outer annular surface of the contraction cone section, and the plurality of circles of cooling ribs are arranged axially along the contraction cone section.

[0005] In the flame tube structure with staggered cooling ribs, the cooling ribs in two adjacent circles are staggered.

[0006] The flame tube structure with staggered cooling ribs is described, wherein the cooling ribs are of trapezoidal cross-section shape. Beneficial Effects

[0007] 1. The present invention increases the wall turbulence intensity and reduces the generation of trapped vortex by reasonably arranging ribs on the outer wall of the flame tube, thereby greatly improving the cooling efficiency of the flame tube wall.

[0008] 2. The present invention has a simple structure, does not require a hole punching process on the wall, and does not affect the combustion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the flame tube structure and airflow of the present invention; Figure 2It is the arrangement details of the staggered ribs of the present invention; Figure 3 It is the cross section of the trapezoidal cooling rib of the present invention; In the figure: 1. Front straight section; 2. Converging cone section; 3. Rear straight section; 4. Cooling ribs; 5. Low-temperature air; 6. High-temperature combustion gas. DETAILED DESCRIPTION

[0010] Reference Figure 1-Figure 3 , a flame tube structure with staggered cooling ribs, which comprises a front straight section 1, a contraction cone section 2 and a rear straight section 3, wherein the tail of the front straight section 1 is welded to the large diameter end of the contraction cone section 2, and the head thereof is fixed to the head of the combustion chamber, the small diameter end of the contraction cone section 2 is welded to the rear straight section, and the rear straight section is connected with the rear end component to fix the whole; A plurality of circles of cooling ribs 4 are fixed on the outer annular surface of the contraction cone section, and the plurality of circles of cooling ribs are arranged axially along the contraction cone section.

[0011] In the flame tube structure with staggered cooling ribs, the cooling ribs in two adjacent circles are staggered. When the combustion chamber is running, the low-temperature air 5 provided by the front air supply device flows back along the outer wall of the contraction cone section 2 from the small diameter end to the large diameter end for cooling. The cooling ribs 4 are staggered, which strengthens the cooling of the low-temperature air 5, destroys the boundary layer, and increases the turbulence effect; The low temperature air 5 is mixed with the fuel and burns after flowing through the contraction cone section 2. The fuel burns at the nozzle outlet to generate a large amount of high temperature combustion gas 6, which flows along the inside of the contraction cone section 2 from the large diameter end to the small diameter end.

[0012] The flame tube structure with staggered cooling ribs is trapezoidal in cross section, which reduces the dead zone area of ​​cooling air flow.

Claims

1. A flame tube structure with staggered cooling ribs, characterized by: It consists of a front straight section, a contraction cone section and a rear straight section. The tail of the front straight section is welded to the large diameter end of the contraction cone section, the head is fixed to the head of the combustion chamber, and the small diameter end of the contraction cone section is welded to the rear straight section. A plurality of circles of cooling ribs are fixed on the outer annular surface of the contraction cone section, and the plurality of circles of cooling ribs are arranged axially along the contraction cone section.

2. The flame tube structure with staggered cooling ribs according to claim 1 is characterized in that: The cooling ribs in two adjacent circles are arranged in a staggered manner.

3. The flame tube structure with staggered cooling ribs according to claim 1 or 2, characterized in that: The cooling ribs are in a trapezoidal cross-section.

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