A flame tube structure

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a flame tube structure, a side wall of the flame tube and a side wall of a casing forming an annular passage for cold air flow, wherein a plurality of through holes are formed in the side wall of the flame tube, and a plurality of funnels for introducing the cold air in the annular passage into the interior of the flame tube are arranged in the through holes; a mounting edge for fixing the funnel on the side wall of the flame tube is formed on the side wall surface at the inlet of the funnel, the side wall surface of the funnel is provided with a radially backwardly protruding shoulder, a first gap is formed between the leeward surface of the funnel and the through hole, and the shoulder and the inner surface of the side wall of the flame tube form a second gap in communication with the first gap; the cold air enters the second gap from the first gap, and a cold air film is formed on the inner surface of the side wall of the flame tube, wherein the cold air enters the second gap from the first gap m, a layer of cold air film is formed on the side wall of the flame tube to isolate the high-temperature hot gas, and the temperature of the side wall of the flame tube is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aero-engines, and particularly relates to a flame tube structure. BACKGROUND

[0002] The existing scheme has a backflow area behind the air inlet funnel due to the long air inlet funnel, and high-temperature gas stays in the backflow area, which leads to excessively high wall surface temperature of the flame tube and even ablation cracks, thereby affecting the service life of the flame tube. SUMMARY

[0003] To solve the above problems, the present application provides a flame tube structure, comprising:

[0004] The flame tube is installed in an engine case, and a side wall of the flame tube and a side wall of the engine case form an annular passage for cold air flow, wherein a plurality of through holes are formed in the side wall of the flame tube, and a plurality of funnels for introducing cold air in the annular passage into the interior of the flame tube are installed on the through holes.

[0005] The side wall surface at the inlet of the funnel has a mounting edge for fixing the funnel on the side wall of the flame tube, the side wall surface of the funnel has a radially backward protruding shoulder, a first gap is formed between the leeward surface of the funnel and the through hole, and the shoulder and the inner surface of the side wall of the flame tube form a second gap in communication with the first gap; the cold air enters the second gap from the first gap and forms a cold air film on the inner surface of the side wall of the flame tube.

[0006] Preferably, the mounting edge comprises two lugs, the side wall surface at the inlet of the funnel has mounting holes for mounting the lugs, and the mounting holes are symmetrically arranged on both sides of the funnel.

[0007] Preferably, the outlet of the funnel has a chamfered surface, and the chamfered surface is a windward surface.

[0008] Preferably, the funnel wall surface has a gas hole in communication with the interior of the funnel and the second gap.

[0009] Preferably, a third gap is formed between the windward surface of the funnel and the through hole, and the width of the third gap is smaller than the length of the shoulder along the airflow direction.

[0010] Preferably, the through hole is a long hole through which the funnel can pass.

[0011] Preferably, the free end of the shoulder is arc-shaped.

[0012] Preferably, the width of the first gap is 1-2 mm.

[0013] Preferably, the width of the second gap is 1-2 mm.

[0014] The advantages of the present application include: when the present application works, cold air enters the second gap from the first gap, flows out after passing through the second gap, and forms a layer of cold air film on the flame tube wall surface to isolate high-temperature hot gas, thereby reducing the temperature of the flame tube wall surface and improving reliability. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a partial view of the funnel and the flame tube in a preferred embodiment of the present application;

[0016] Figure 2 is a schematic view of the funnel along the funnel axis in a preferred embodiment of the present application;

[0017] Figure 3 is a gas flow diagram of the funnel and the flame tube in a preferred embodiment of the present application;

[0018] Figure 4 is a schematic view of a traditional funnel of a flame tube;

[0019] Figure 5 is a schematic view of a high-temperature area of a traditional funnel of a flame tube. DETAILED DESCRIPTION

[0020] In order to make the technical solutions of the present application and the advantages thereof clearer, the technical solutions of the present application will be further clearly and completely described below in combination with the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, rather than limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the general design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0021] In addition, unless otherwise defined, technical terms or scientific terms used in the description of the present application shall be understood as having the common meaning to those of ordinary skill in the art to which the present application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer" and the like used in the description of the present application only indicate relative directions or positional relationships, and are not intended to imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and the relative positional relationship may change accordingly when the absolute position of the described object changes, and therefore cannot be understood as a limitation on the present application. The words "first", "second", "third" and the like used in the description of the present application are only for the purpose of description, to distinguish different components, and cannot be understood as indicating or implying relative importance. The words "one", "an" or "the" and the like used in the description of the present application should not be understood as an absolute limitation on the number, but should be understood as the presence of at least one. The words "including" or "containing" and the like used in the description of the present application mean that the elements or objects appearing before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects.

[0022] In addition, it should be noted that, unless otherwise specified and limited, the words "mounting", "connecting", "connecting" and the like used in the description of the present application should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or the connection between two elements, those skilled in the art can understand the specific meaning of the present application according to the specific circumstances.

[0023] A flame tube structure, the flame tube is installed in the casing, the flame tube side wall and the casing side wall form an annular passage for cold air flow, wherein a plurality of through holes are formed on the side wall of the flame tube, and a plurality of funnels 2 for introducing cold air in the annular passage into the interior of the flame tube are installed on the through holes;

[0024] Wherein the side wall surface at the inlet of the funnel 2 has a mounting edge for fixing the funnel 2 on the side wall of the flame tube, the side wall surface of the funnel 2 has a shoulder 1 formed by radially protruding backward, the leeward surface of the funnel 2 and the through hole form a first gap, the shoulder 1 and the inner surface of the side wall of the flame tube form a second gap communicating with the first gap; the cold air enters the second gap from the first gap, and forms a cold air film on the inner surface of the side wall of the flame tube.

[0025] In some alternative embodiments, the mounting edge comprises two lugs, the side wall surface of the funnel 2 at the inlet has mounting holes for mounting the lugs, the mounting holes are symmetrically arranged on both sides of the funnel 2, the lugs can be fixed on the side wall of the flame tube by welding or threaded fasteners, the connection between the lugs and the funnel 2 can be plug-in or welding, the lugs are rectangular in shape, the mounting holes are also rectangular, which can limit the rotation of the funnel 2, further, the mounting holes are tapered inwardly, and the mounting holes have the same taper as the mounting holes, so that an interference fit can be achieved during installation.

[0026] In some alternative embodiments, the outlet of the funnel 2 has a chamfered surface, which is the windward surface.

[0027] In some alternative embodiments, the wall surface of the funnel 2 has a gas hole communicating with the inside of the funnel 2 and the second gap.

[0028] In some alternative embodiments, a third gap is formed between the windward surface of the funnel 2 and the through hole, and the width of the third gap is smaller than the length of the shoulder 1 along the airflow direction.

[0029] In some alternative embodiments, the through hole is a long slot through which the funnel 2 can pass, and when the sum of the first gap and the third gap is greater than the length of the shoulder along the airflow direction, the funnel can pass through the through hole.

[0030] In some alternative embodiments, the free end of the shoulder 1 is arc-shaped.

[0031] In some alternative embodiments, the width of the first gap is 1-2 mm, and the width of the second gap is 1-2 mm, during operation, cold air enters the second gap n from the first gap m, and then flows out of the second gap n, forming a layer of cold air film on the wall surface of the flame tube to isolate the high-temperature hot gas, thereby reducing the temperature of the wall surface of the flame tube and improving the reliability.

[0032] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flame tube structure, characterized by, The application relates to a flame tube for a gas turbine engine, comprising: the flame tube is installed in a casing, and a side wall of the flame tube and a side wall of the casing form an annular passage for cold air flow, wherein a plurality of through holes are formed in the side wall of the flame tube, and a plurality of funnels (2) for introducing cold air in the annular passage into the interior of the flame tube are installed in the through holes; wherein the side wall surface at the inlet of the funnel (2) is provided with a mounting edge for fixing the funnel (2) on the side wall of the flame tube, the side wall surface of the funnel (2) is provided with a shoulder (1) formed by being radially protruded backward, a first gap is formed between the leeward surface of the funnel (2) and the through hole, and a second gap is formed between the shoulder (1) and the inner surface of the side wall of the flame tube and is communicated with the first gap; the cold air enters the second gap from the first gap and forms a cold air film on the inner surface of the side wall of the flame tube; the wall surface of the funnel (2) is provided with a gas hole for communicating the interior of the funnel (2) with the second gap.

2. The flame tube structure of claim 1, wherein the mounting edge comprises two lugs, the side wall surface at the inlet of the funnel (2) is provided with mounting holes for mounting the lugs, and the mounting holes are symmetrically arranged on both sides of the funnel (2).

3. The flame tube structure of claim 1, wherein the outlet of the funnel (2) is provided with a chamfered surface, and the chamfered surface is a windward surface.

4. The flame tube structure of claim 1, wherein a third gap is formed between the windward surface of the funnel (2) and the through hole, and the width of the third gap is smaller than the length of the shoulder (1) along the air flow direction.

5. The flame cell structure of claim 1, wherein, the through hole is a long strip hole through which the funnel (2) can pass.

6. The flame cell structure of claim 1, wherein, the free end of the shoulder (1) is arc-shaped.

7. The flame cell structure of claim 1, wherein, the width of the first gap is 1-2 mm.

8. The flame cell structure of claim 1 wherein, the width of the second gap is 1-2 mm.

Images