CN114777158A - Combustion chamber mixing structure based on blunt body group - Google Patents

Abstract

The object of the present invention is to provide a combustion chamber mixing structure based on a bluff body group, comprising a combustion chamber and a bluff body group, the combustion chamber includes a front wall and a pipe wall behind it, a nozzle is installed on the front wall, and the bluff body group Including a front bluff body and a rear bluff body, the front bluff body includes an outer wall and an inner wall, the inner wall is located outside the nozzle, the outer wall is located outside the inner wall, a flow channel is formed between the outer wall and the inner wall, the flow channel communicates with the inner space of the pipe wall, and the pipe wall is provided with Air intake hole, rear bluff body is set behind the air intake hole. The invention adds several pairs of bluff body groups on the basis of the traditional combustion chamber, which can replace the swirler, improve the mixing effect of oil and gas, and play the role of stabilizing the flame.

Description

A Combustion Chamber Blending Structure Based on Blunt Body Group

technical field

The present invention relates to a gas turbine, in particular to a combustion chamber structure of the gas turbine.

Background technique

Gas turbine has the characteristics of high power density and strong maneuverability. Its main components include compressor, combustion chamber, and turbine. It is a typical power plant. The compressor does work on the incoming gas to increase the pressure, the fuel is ignited in the combustion chamber and mixed with the incoming high-pressure gas to push the turbine to do work, and the work generated by the turbine is used to drive the compressor to rotate, forming a Brayton cycle. However, there are problems of insufficient fuel combustion and unstable combustion in the combustion chamber, which greatly affects the working stability of the gas turbine. Therefore, it is necessary to design a structure that can improve the mixing effect of oil and gas and stabilize the flame.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a combustion chamber mixing structure based on a bluff body group which can improve the oil-gas mixing effect and the flame stabilization effect.

The object of the present invention is achieved in this way:

A combustion chamber mixing structure based on a bluff body group of the present invention is characterized in that it includes a combustion chamber and a bluff body group, the combustion chamber includes a front wall and a pipe wall behind it, a nozzle is installed on the front wall, and the bluff body group Including a front bluff body and a rear bluff body, the front bluff body includes an outer wall and an inner wall, the inner wall is located outside the nozzle, the outer wall is located outside the inner wall, a flow channel is formed between the outer wall and the inner wall, the flow channel communicates with the inner space of the pipe wall, and the pipe wall is provided with Air intake hole, rear bluff body is set behind the air intake hole.

The present invention can also include:

1. The rear bluff body adopts a fan-shaped section and is fixed on the pipe wall through its own connecting rod, so as to block the airflow entering the inside of the pipe wall.

2. The outer wall and inner wall of the front bluff body adopt trapezoidal sections, and the outer wall and the inner wall are arranged with 6 circumferentially, and the trapezoidal section causes the airflow to generate a detachment vortex; the rear bluff body is evenly arranged circumferentially 6; It is arranged in the form of crossing with the rear bluff space.

The advantage of the present invention is: the present invention adds several pairs of bluff body groups on the basis of the traditional combustion chamber, which can replace the swirler, improve the mixing effect of oil and gas, and play the role of stabilizing the flame.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic diagram of the front bluff body and the rear bluff body;

Figure 3 is a schematic diagram of the cross arrangement of the front bluff body and the rear bluff body;

Figure 4 is a schematic diagram of the axial arrangement of the front bluff body, the rear bluff body and the air inlet holes of the combustion chamber wall;

Figure 5 is a schematic diagram of the composition of the front bluff body;

Fig. 6 is the schematic diagram of rear bluff body;

FIG. 7 is a streamline diagram of the flow field in the combustion chamber 1 after the bluff body group 2 is added.

Detailed ways

The present invention will be described in more detail below in conjunction with the accompanying drawings:

1-7 , the present invention includes: a combustion chamber 1 and a bluff body group 2 . The combustion chamber includes a front wall 1.1, a pipe wall 1.2, and a nozzle 1.3; the bluff body group 2 includes a front bluff body 2.1 and a rear bluff body 2.2.

The front bluff body 2.1 is composed of an outer wall 2.1.1 and an inner wall 2.1.2, and a flow channel is formed between the outer wall 2.1.1 and the inner wall 2.1.2.

The front bluff body 2.1 adopts a trapezoidal cross-section, which is fixed on the front wall 1.1 of the combustion chamber 1, and 6 are evenly arranged in the circumferential direction; the trapezoidal cross-section can ensure the stable feeding of the pipe wall 1.2 side while generating the front bluff body 2.1 and the rear detachment vortex. gas.

The rear bluff body 2.2 is fixed on the tube wall 1.2 of the combustion chamber 1 through its own connecting rod with a fan-shaped section, and 6 are evenly arranged in the circumferential direction, which only blocks the main air flow and generates eddy current without causing excessive total pressure loss. .

The air inlet hole of the tube wall 1.2 of the combustion chamber 1 is located between the front bluff body 2.1 and the rear bluff body 2.2, and the air inlet hole is in the middle of the two front bluff bodies 2.1 in the circumferential direction. The layout is shown in Figure 1.

The front bluff body 2.1 and the rear bluff body 2.2 are arranged in a cross form, as shown in Figure 3.

As shown in Figure 7, there is a large vortex generated by the main air flow in front of the rear bluff body 2.2, and there is a detachment vortex between the front bluff body 2.1 and the large vortex, and the two vortex areas form a relatively close large-scale vortex area.

When the gas turbine is working normally, the high-pressure air flow from the compressor is divided into two parts, one main air flow enters the combustion chamber 1 through the air inlet hole of the tube wall 1.2 of the combustion chamber 1, and the other secondary air flow enters the combustion chamber 1 from the front bluff body 2.1 into the flow channel. The main air flow enters through the air inlet hole of the pipe wall 1.2 and is blocked by the rear bluff body 2.2 to generate a vortex. The secondary air flow enters the narrow flow channel of the front bluff body 2.1 to form a relatively compact detached vortex that is blocked by the vortex mass at a high speed. On the whole, under the action of the bluff body group 2, the main air flow and the secondary air flow form a large and compact vortex area, which is conducive to the mixing effect of oil and gas and stabilizes the flame.

Claims (3)

1. The utility model provides a combustion chamber mixing structure based on bluff body group which characterized by: including combustion chamber, bluff body group, the combustion chamber includes the pipe wall at antetheca and rear, preceding wall mounting nozzle, bluff body group is including preceding bluff body and back bluff body, preceding bluff body includes outer wall and inner wall, and the inner wall is located the nozzle outside, and the outer wall is located the inner wall outside, forms the runner between outer wall and the inner wall, and runner intercommunication pipe wall inner space sets up the inlet port on the pipe wall, and the bluff body after the inlet port rear sets up.

2. The bluff body group-based combustion chamber blending structure of claim 1, wherein: the rear blunt body is fixed on the pipe wall through a connecting rod per se by adopting a fan-shaped section, and blocks air flow entering the pipe wall.

3. The bluff body group-based combustion chamber blending structure of claim 1, wherein: the outer wall and the inner wall of the front bluff body are both provided with trapezoidal sections, 6 outer walls and 6 inner walls are circumferentially arranged, and the trapezoidal sections enable airflow to generate a body shedding vortex; 6 rear bluff bodies are uniformly arranged in the circumferential direction; the front bluff body and the rear bluff body are arranged in a spatial crossing mode.

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