Liquid center type gas-liquid coaxial centrifugal nozzle for inhibiting self-oscillation

Abstract

The utility model discloses a liquid center type gas-liquid coaxial centrifugal nozzle for inhibiting self-oscillation, which is characterized by comprising a first shell and a second shell which are of a revolving body structure, and the first shell is provided with a first component inlet, a second component inlet, a spray outlet and a retraction chamber; the second shell is coaxially arranged on the first shell, a centrifugal flow channel is formed in the second shell, and a circular seam airflow flow channel is defined between the second shell and the first shell; the first component inlet, the centrifugal runner and the first end of the retraction chamber are communicated in sequence, and the second component inlet, the circular seam airflow runner and the first end of the retraction chamber are communicated in sequence; the spray outlet is located at the second end of the retraction chamber, and the inner wall of the second end of the retraction chamber is of a fillet structure. The self-oscillation suppression device is applied to the field of suppression of self-oscillation and unstable combustion of a liquid rocket engine, and can effectively suppress self-oscillation on the premise of not influencing the atomization effect of a nozzle, so that reliable and stable combustion of the engine is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of self-excited oscillation and unstable combustion suppression of liquid rocket engines, in particular to a liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation. Background Art

[0002] In liquid rocket engines, the nozzle connects the supply system and the combustion chamber, is responsible for the injection and atomization of the fuel, and plays a decisive role in the evaporation, mixing and combustion of the fuel. Since the interaction between gas and liquid can significantly improve the atomization performance of the nozzle and thus enhance the combustion efficiency, the gas-liquid coaxial nozzle is widely used in bipropellant liquid rocket engines. According to the distribution position of gas and liquid in the nozzle, the gas-liquid coaxial centrifugal nozzle is further subdivided into liquid-centered gas-liquid coaxial centrifugal nozzle and gas-centered gas-liquid coaxial centrifugal nozzle. However, due to the intense gas-liquid interaction, this type of nozzle will experience self-excited oscillation under certain structures and working conditions.

[0003] When self-excited oscillation occurs, the pressure and flow rate at the nozzle outlet will oscillate periodically, accompanied by sharp nozzle whistling. The typical self-excited oscillation spray is in the shape of a "Christmas tree", with an oscillation frequency between 1kHz and 10kHz. Studies have found that self-excited oscillation can cause oscillations in the flame and pre-fuel injection pressure. Under certain operating conditions, self-excited oscillation can stimulate unstable combustion, which has an adverse effect on the engine spray combustion process and needs to be suppressed.

[0004] At present, the self-excited oscillation is mostly suppressed by changing the gas-liquid injection conditions and the nozzle retraction length. For a specific engine, the nozzle design conditions are usually determined, and adjusting the retraction length often greatly affects the atomization effect and combustion performance, which may lead to poor atomization effect and reduced combustion efficiency. Utility Model Content

[0005] In view of the deficiencies in the above-mentioned prior art, the utility model provides a liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillations, which can effectively suppress self-excited oscillations without affecting the atomization effect of the nozzle, thereby achieving reliable and stable combustion of the engine.

[0006] To achieve the above-mentioned object, the utility model provides a liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation, comprising a first shell and a second shell of a rotating body structure, wherein the first shell is provided with a first component inlet, a second component inlet, a spray outlet and a retracting chamber;

[0007] The second shell is coaxially arranged on the first shell, a centrifugal flow channel is arranged in the second shell, and an annular air flow channel is formed between the second shell and the first shell;

[0008] The first component inlet, the centrifugal flow channel, and the first end of the retracted chamber are connected in sequence, and the second component inlet, the annular gap airflow channel, and the first end of the retracted chamber are connected in sequence;

[0009] The spray outlet is located at the second end of the retracted chamber, and the inner wall of the second end of the retracted chamber is a rounded structure.

[0010] In one embodiment, a central entity with a rod-shaped structure is coaxially disposed in the centrifugal flow channel.

[0011] In one embodiment, the centrifugal flow channel includes a cyclone chamber, a contraction section, an equal straight section and an expansion section which are connected in sequence;

[0012] The inner diameter of the cyclone chamber is larger than that of the straight section, and the cyclone chamber is connected to the first component inlet, and the expansion section is connected to the retraction chamber;

[0013] The first end of the central entity is located in the cyclone chamber and is fixedly connected to the inner wall of the first end of the second shell, and the second end of the central entity extends into the straight section.

[0014] In one embodiment, the cross-sectional shape of the central entity is circular, elliptical or polygonal.

[0015] In one embodiment, a first cavity is further provided between the first shell and the second shell, and the first component inlet and the centrifugal flow channel are respectively connected to the first cavity.

[0016] In one embodiment, a plurality of tangential holes are provided at intervals along the circumferential direction on the side of the second shell, one end of each of the tangential holes is connected to the first cavity, and the other end is tangential to and connected to the centrifugal flow channel.

[0017] In one embodiment, a second cavity is further provided between the first shell and the second shell, and the second component inlet and the annular seam airflow channel are respectively connected to the second cavity.

[0018] In one embodiment, a side portion of the second shell is provided with a connecting portion along a circumferential direction, and the first shell includes a cover body and a base body;

[0019] The first end of the second shell is located in the cover body, the first component inlet is arranged on the top of the cover body, the bottom of the cover body is connected to the top of the connecting portion, and the first cavity is located between the inner wall of the cover body and the outer wall of the second shell;

[0020] The second end of the second shell is located in the base, and the top of the base is connected to the bottom of the connecting part, the spray outlet is arranged at the bottom of the base, the second component inlet is arranged at the side of the base, and the second cavity and the annular seam airflow channel are located between the inner wall of the base and the outer wall of the second shell.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] 1. The utility model sets the inner wall of the second end of the retracting chamber as a rounded structure, so that when the conical liquid film or conical air film ejected from the centrifugal flow channel moves inside the retracting chamber, it cannot completely block the outer annular gap air flow channel, and thus cannot meet the conditions for the generation of self-excited oscillation, thereby effectively suppressing the generation of self-excited oscillation;

[0023] 2. In the preferred embodiment of the utility model, a central entity of a certain length and diameter is coaxially arranged in the centrifugal flow channel, so that when the first combustion component flows in the centrifugal flow channel, the generation of dominant surface waves and the oscillation characteristics of the surface waves can be suppressed. In addition, since the violent centrifugal motion will generate a central air core on the axis of the centrifugal flow channel, the central entity can also shorten the size of the central air core and suppress the oscillation of the central air core to a certain extent, thereby effectively suppressing the generation of self-excited oscillations, suppressing self-excited oscillations from the source, and will not affect the nozzle atomization effect, thereby achieving reliable and stable combustion of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is an axial cross-sectional view of the overall structure of the gas-liquid coaxial centrifugal nozzle in Example 1 of the utility model;

[0026] Figure 2 This is an axial cross-sectional view of the inner shell in Example 1 of the utility model;

[0027] Figure 3 It is a cross-sectional view of the gas-liquid coaxial centrifugal nozzle at the tangential hole in Example 1 of the utility model;

[0028] Figure 4 It is a cross-sectional view of the gas-liquid coaxial centrifugal nozzle at the annular seam gas flow channel in Example 1 of the utility model;

[0029] Figure 5This is an axial cross-sectional view of the overall structure of the gas-liquid coaxial centrifugal nozzle in Example 2 of the utility model;

[0030] Figure 6 This is an axial cross-sectional view of the inner shell in Example 2 of the utility model;

[0031] Figure 7 This is a schematic diagram of another implementation of the gas-liquid coaxial centrifugal nozzle in Example 2 of the utility model.

[0032] Figure numbers: first shell 1, cover 101, base 102, second shell 2, connecting part 201, tangential hole 202, first component inlet 3, second component inlet 4, spray outlet 5, retraction chamber 6, centrifugal flow channel 7, cyclone chamber 701, contraction section 702, straight section 703, groove 7031, protrusion 7032, expansion section 704, annular seam airflow channel 8, first cavity 9, second cavity 10, central entity 11.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] Example 1

[0040] like Figures 1 to 4 The embodiment shows a liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation, which mainly includes a first shell 1 and a second shell 2 of a rotating body structure, and the first shell 1 is provided with a first component inlet 3, a second component inlet 4, a spray outlet 5 and a retracting chamber 6. The second shell 2 is coaxially arranged on the first shell 1, and a centrifugal flow channel 7 is provided in the second shell 2. An annular seam airflow channel 8 is formed between the second shell 2 and the first shell 1. The first component inlet 3, the centrifugal flow channel 7, and the first end of the retracting chamber 6 are connected in sequence to form a flow path of the first combustion component in the nozzle; the second component inlet 4, the annular seam airflow channel 8, and the first end of the retracting chamber 6 are connected in sequence to form a flow path of the second combustion component in the nozzle. The spray outlet 5 is located at the second end of the retracting chamber 6, and the first combustion component and the second combustion component interact violently inside the retracting chamber 6, thereby completing the crushing atomization process. Among them, the inner wall of the second end of the retracting chamber 6 is a rounded structure, which is used to suppress the self-excited oscillation of the nozzle to a certain extent.

[0041] Taking the first combustion component as liquid fuel and the second combustion component as gas fuel as an example, after the liquid fuel enters the centrifugal flow channel 7, it rotates and sprays out from the second end of the centrifugal flow channel 7 under the action of centrifugation, forming a conical liquid film. At the same time, it interacts violently with the gas fuel sprayed from the annular gap gas flow channel 8 inside the retracting chamber 6 and then sprays out from the spray outlet 5, thereby completing the crushing atomization process. In this process, there are two types of self-excited oscillation phenomena in the nozzle: self-excited oscillation of periodic blocking of gas by liquid film and self-excited oscillation of periodic squeezing of liquid film by gas. The former is caused by the periodic oscillation of gas pressure inside the retracting chamber 6 due to the periodic blocking effect of the conical liquid film on the annular gap gas, and the latter is attributed to the periodic squeezing and hindering effect of the annular gap gas on the conical liquid film, which corresponds to the self-excited oscillation of the larger retracting nozzle after the "intermittent jump". In summary, the generation of these two types of self-excited oscillations is caused by the periodic blocking and squeezing effect of gas and liquid inside the retracting chamber 6. Based on this, this embodiment sets the inner wall of the second end of the retraction chamber 6 as a chamfered structure. Through the chamfered structure, when the conical liquid film moves inside the retraction chamber 6, it cannot completely block the outer annular air flow channel 8, and thus cannot meet the conditions for the generation of self-excited oscillation, thereby effectively suppressing the generation of self-excited oscillation.

[0042] In the specific implementation process, the rounded corner structure on the inner wall of the retracted chamber 6 needs to be able to suppress self-excited oscillation while minimizing the impact on the nozzle atomization effect. Therefore, the chamfer radius needs to be specifically designed. The specific implementation process is as follows:

[0043] In a larger flow range, the spray cone angle of the centrifugal nozzle of this embodiment is less than 90°. Although the indentation chamber 6 can enhance the gas-liquid interaction and promote atomization to a certain extent, the wall of the indentation chamber 6 will inhibit the radial development of the spray, thereby causing the radial momentum loss of the spray, and further resulting in a reduction in the spray cone angle of the gas-liquid coaxial centrifugal nozzle. In order to enhance the gas-liquid interaction and reduce the inhibitory effect of the wall of the indentation chamber 6 on the radial direction of the spray, this embodiment is constrained by a maximum spray cone angle of 90°, that is, the fillet radius on the inner wall of the second end of the indentation chamber 6 is equal to the indentation length of the indentation chamber 6.

[0044] In this embodiment, the centrifugal flow channel 7 includes a cyclone chamber 701, a contraction section 702, a straight section 703 and an expansion section 704 which are connected in sequence. The inner diameter of the cyclone chamber 701 is larger than that of the straight section 703, and it is the main centrifugal area of ​​the centrifugal flow channel 7. The cyclone chamber 701 is connected to the first component inlet 3, and the expansion section 704 is connected to the retraction chamber 6.

[0045] In a specific implementation process, a connecting portion 201 along the circumferential direction is provided on the side of the second shell 2 , and the first shell 1 includes a cover body 101 and a base body 102 .

[0046] The first end of the second shell 2 is located in the cover 101, the first component inlet 3 is opened at the center of the top of the cover 101, and the bottom of the cover 101 is fixedly connected to the top of the connecting portion 201 by means of a sealing ring, a snap connection, a bolt connection or a threaded connection. The outer wall of the first end of the second shell 2 and the inner wall of the cover 101 form a first cavity 9, and the first component inlet 3 is connected to the first cavity 9. At the same time, the side of the first end of the second shell 2 is provided with a plurality of spaced-apart holes along the circumferential direction. Figure 3 As shown in the tangential holes 202, one end of each tangential hole 202 is connected to the first cavity 9, and the other end is connected to the swirl chamber 701. In specific applications, the first combustion component first enters the first cavity 9 through the first component inlet 3, and then enters the swirl chamber 701 through the tangential hole 202, and is ejected from the expansion section 704 under the action of centrifugal force to form a conical liquid film.

[0047] The second end of the second shell 2 is located in the base 102, the second component inlet 4 is opened at the upper side of the base 102, and the top of the base 102 is fixedly connected to the bottom of the connecting portion 201 by means of a sealing ring, snap connection, bolt connection or threaded connection, and the spray outlet 5 is opened at the bottom of the base 102. The inner wall of the base 102 near the top and the outer wall of the second shell 2 are clearance-fitted or full-fitted, the inner wall of the base 102 near the middle and the outer wall of the second shell 2 form a second cavity 10, the inner wall of the base 102 near the bottom and the outer wall of the second shell 2 form an annular gap airflow channel 8, and the inner wall of the bottom of the base 102 separately forms an indentation chamber 6, and the second component inlet 4, the second cavity 10, the annular gap airflow channel 8 and the indentation chamber 6 are connected in sequence. Among them, the number of the second component inlet 4 is multiple, and each second component inlet 4 is spaced circumferentially on the side of the base 102. In specific applications, the second combustion component first enters the second cavity 10 through the second component inlet 4, then enters the retraction chamber 6 through the annular seam airflow channel 8, and violently interacts with the first combustion component forming a conical liquid film, and then is ejected from the spray outlet 5, thereby completing the crushing atomization process.

[0048] Example 2

[0049] like Figure 5 , Figure 6 The present embodiment discloses a liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillations. Its implementation is basically the same as that of Example 1, with the difference that: on the basis of Example 1, a central entity 11 of a rod-shaped structure is coaxially provided in the centrifugal flow channel 7 in the present embodiment to further suppress the self-excited oscillations of the nozzle.

[0050] In the specific implementation process, the first end of the central entity 11 is located in the cyclone chamber 701, and the first end of the central entity 11 is fixedly connected to the inner wall of the first end of the second shell 2 by welding, threaded connection or integral molding, and the second end of the central entity 11 extends into the straight section 703. The cross-sectional shape of the central entity 11 is circular, elliptical or polygonal, and is preferably circular in this embodiment.

[0051] Similarly, taking the first combustion component as liquid fuel and the second combustion component as gas fuel as an example, after the liquid fuel enters the centrifugal flow channel 7, a central air core is generated on the axis of the centrifugal flow channel 7 due to the violent centrifugal motion, and the central air core will bring a certain degree of oscillation. Based on this, this embodiment coaxially arranges a central entity 11 of a rod-shaped structure in the centrifugal flow channel 7. Since the central entity 11 occupies the axial part of the main centrifugal area in the centrifugal flow channel 7 and has a certain diameter and length, the size of the central air core can be reduced to a certain extent, thereby suppressing the oscillation caused by the central air core. In addition, the nozzle's liquid film periodically blockage gas type self-excited oscillation and gas periodically squeeze liquid film type self-excited oscillation will produce surface wave structure at the gas-liquid interface in the retraction chamber 6. For gas-liquid coaxial centrifugal nozzles, usually in order to improve the atomization performance, there will be a certain retraction length. For a given gas-liquid injection condition, with the increase of the retraction length, the surface wave structure at the gas-liquid interface will easily cause the spray to change from a steady state to a self-excited oscillation state. When the self-excited oscillation frequency is coupled with the inherent acoustic frequency of the combustion chamber, it will induce unstable combustion, which is extremely unfavorable for the reliable and stable combustion of the engine. Based on this, the present embodiment coaxially arranges a central entity 11 of a rod-shaped structure in the centrifugal flow channel 7. Since the central entity 11 occupies the axial part of the main centrifugal area in the centrifugal flow channel 7 and has a certain diameter and length, the size of the central air core can be reduced to a certain extent, thereby suppressing the oscillation caused by the central air core; due to the contraction of the flow channel, the dominant surface wave starts at the outlet of the contraction section 702 of the centrifugal flow channel 7. In the present embodiment, the diameter of the central entity 11 is determined according to the size of the central air core, and the length of the central entity 11 is greater than or equal to the sum of the axial dimensions of the vortex chamber 701 and the contraction section 702, that is, the second end of the central entity 11 extends into the straight section 703. Due to the existence of the central entity 11, the fluctuation space at the gas-liquid interface at the outlet of the contraction section 702 is reduced, thereby suppressing the generation of the surface wave structure here to a certain extent. Therefore, the central entity 11 can effectively suppress the generation of self-excited oscillations without affecting the nozzle atomization effect, thereby realizing reliable and stable combustion of the engine.

[0052] In the specific implementation process, the central entity 11 needs to be able to suppress self-excited oscillation while minimizing the impact on the centrifugal effect of the centrifugal flow channel 7. Therefore, its length and diameter need to be specifically designed. The specific implementation process is as follows:

[0053] When the entrance Reynolds number of the tangential hole 202 is t When Re is greater than 2400, the central air core inside the nozzle is in a fully developed stable state. For a fully developed stable air core, the size of the air core increases with Re t In order to effectively suppress the generation of dominant surface waves, the diameter of the central entity 11 in this embodiment is set equal to the central air core diameter when the central entity 11 is not set. The length of the central entity 11 is determined according to the mass flow rate of the liquid and should be greater than or equal to the sum of the axial dimensions of the cyclone chamber 701 and the contraction section 702. The fully developed stable air core size formula is:

[0054]

[0055] Among them, D a is the diameter of the gas core, D0 is the diameter of the straight section, D s is the diameter of the cyclone chamber, D p is the tangential hole diameter, L0 is the length of the straight section, and α is the contraction angle of the contraction section;

[0056] Tangential hole entrance Reynolds number Re t The specific calculation formula is:

[0057]

[0058] In the formula, ρ l is the density of liquid fuel, μ l Liquid dynamic viscosity, ω t is the tangential hole entrance velocity, d t is the tangential hole diameter.

[0059] As a preferred embodiment, the inner wall of the straight section 703 is further provided with a groove 7031 and / or a protrusion 7032, wherein the groove 7031 and the protrusion 7032 can be provided as a plurality of grooves 7031 and protrusions 7032 distributed along the circumferential direction and / or axial direction of the straight section 703, for example Figure 7 By providing the groove 7031 and the protrusion 7032 on the inner wall of the straight section 703, a certain disturbance effect can be exerted on the swirl flow in the straight section 703. As the swirl flow is ejected from the expansion section 704, this disturbance destroys and suppresses the surface wave structure at the gas-liquid interface in the retracting chamber 6, thereby also suppressing the generation of self-excited oscillation to a certain extent.

[0060] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation, characterized in that: It comprises a first shell and a second shell of a rotating body structure, wherein the first shell is provided with a first component inlet, a second component inlet, a spray outlet and a retracting chamber; The second shell is coaxially arranged on the first shell, a centrifugal flow channel is arranged in the second shell, and an annular air flow channel is formed between the second shell and the first shell; The first component inlet, the centrifugal flow channel, and the first end of the retracted chamber are connected in sequence, and the second component inlet, the annular gap airflow channel, and the first end of the retracted chamber are connected in sequence; The spray outlet is located at the second end of the retracted chamber, and the inner wall of the second end of the retracted chamber is a rounded structure.

2. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 1, characterized in that: A central entity with a rod-shaped structure is coaxially arranged in the centrifugal flow channel.

3. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 2, characterized in that: The centrifugal flow channel comprises a cyclone chamber, a contraction section, a straight section and an expansion section which are connected in sequence; The inner diameter of the cyclone chamber is larger than that of the straight section, and the cyclone chamber is connected to the first component inlet, and the expansion section is connected to the retraction chamber; The first end of the central entity is located in the cyclone chamber and is fixedly connected to the inner wall of the first end of the second shell, and the second end of the central entity extends into the straight section.

4. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 2 or 3, characterized in that: The cross-sectional shape of the central entity is circular, elliptical or polygonal.

5. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 1, 2 or 3, characterized in that: A first cavity is further provided between the first shell and the second shell, and the first component inlet and the centrifugal flow channel are respectively communicated with the first cavity.

6. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 5, characterized in that: The side portion of the second shell is provided with a plurality of tangential holes at intervals along the circumferential direction, one end of each of the tangential holes is communicated with the first cavity, and the other end is tangential to and communicated with the centrifugal flow channel.

7. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 5, characterized in that: A second cavity is further provided between the first shell and the second shell, and the second component inlet and the annular seam airflow channel are respectively communicated with the second cavity.

8. The liquid-centered gas-liquid coaxial centrifugal nozzle for suppressing self-excited oscillation according to claim 7, characterized in that: The side of the second shell is provided with a connecting portion along the circumferential direction, and the first shell includes a cover body and a base body; The first end of the second shell is located in the cover body, the first component inlet is arranged on the top of the cover body, the bottom of the cover body is connected to the top of the connecting portion, and the first cavity is located between the inner wall of the cover body and the outer wall of the second shell; The second end of the second shell is located in the base, and the top of the base is connected to the bottom of the connecting part, the spray outlet is arranged at the bottom of the base, the second component inlet is arranged at the side of the base, and the second cavity and the annular seam airflow channel are located between the inner wall of the base and the outer wall of the second shell.

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