A main fuel nozzle atomization structure

Abstract

The present invention is applicable to the technical field of engine fuel nozzles, and specifically is a main fuel nozzle atomization structure, comprising a nozzle; a fuel pipeline is connected to the nozzle; the structure also comprises a flame tube nozzle assembly, the nozzle is inserted into the interior of the flame tube nozzle assembly, and the fuel enters the flame tube nozzle assembly through the fuel pipeline and the nozzle; the flame tube nozzle assembly is provided with an air path; an oil path is arranged at the front end of the flame tube nozzle assembly, and the oil path includes an expansion nozzle, and the fuel passing through the curved oil path inside the flame tube nozzle assembly and the high-pressure gas entering from the air path are mixed to form an atomization space, and the high-pressure gas tears the sprayed fuel under the action of inertial force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality; the service life of the combustion chamber is extended; a pneumatic atomization structure is adopted to ensure good fuel atomization performance, uniform oil and gas mixing, and reduced carbon deposition and smoke.

Description

Technical Field

[0001] The invention relates to the technical field of engine fuel nozzles, in particular to a main fuel nozzle atomization structure. Background Art

[0002] The fuel nozzle belongs to the field of engine technology. It is a device composed of a cavity, an oil valve and a nozzle cap. When the fuel pressure in the oil cavity is higher than a set value, the oil valve opens and the fuel is sprayed out through the nozzle cap. The oil valve is composed of a valve body, a valve seat and a spring. The rear end of the valve seat is connected to the cavity to form an oil cavity. The cavity is provided with an inlet channel to enter the oil cavity. The spring is located in the oil cavity and acts between the valve body and the valve seat to close the oil valve. The front end of the valve seat is connected to the nozzle cap to form a residual volume. The nozzle cap is provided with a spray hole connected to the residual volume. A new type of structural fuel nozzle used in a pulse fuel pump in an electronic fuel injection system. It has the beneficial effects and progress of small size, simple structure, low manufacturing cost and convenient setting of the injection direction.

[0003] One of the key components of the engine is the fuel nozzle, whose function is to atomize the fuel, accelerate the formation of the mixture, ensure stable combustion and improve combustion efficiency. However, the quality of fuel atomization will directly affect the combustion efficiency of the fuel. Poor atomization quality will result in a large average diameter of the liquid mist, making ignition difficult and increasing exhaust smoke; circumferential unevenness of the fuel will cause uneven temperature field at the combustion chamber outlet, resulting in local hot zones and affecting the life of the turbine; too small a spray cone angle will cause more oil droplets to concentrate on the center line of the flame tube for combustion, making the center too rich in oil and prone to smoke; the atomization characteristics of the nozzle have a great influence on the performance and working life of the combustion chamber,

[0004] Therefore, it is of great significance to develop a main fuel nozzle atomization structure with good atomization performance for aerospace engines. The aircraft engine is a highly complex and precise thermal machine. As the heart of the aircraft, it is not only the power of the aircraft flight, but also an important driving force for the development of aviation. Every important change in the history of human aviation is inseparable from the technological progress of aircraft engines.

[0005] Regarding the engine fuel nozzle atomization structure, the traditional nozzle atomization structure has poor atomization quality, is easy to form carbon deposits, and has uneven fuel circumference. Summary of the invention

[0006] The purpose of the present invention is to provide a main fuel nozzle atomization structure to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A main fuel nozzle atomization structure includes a nozzle installed on a combustion chamber casing; a fuel pipeline is connected to the nozzle; the structure also includes a flame tube nozzle assembly, the nozzle is inserted into the flame tube nozzle assembly, and the fuel enters the flame tube nozzle assembly through the fuel pipeline and the nozzle; the flame tube nozzle assembly is provided with an air circuit, and the air circuit is used to supply high-pressure gas; an oil circuit is provided at the front end of the flame tube nozzle assembly, and the oil circuit includes an expansion nozzle, and the fuel provided by the nozzle and the high-pressure gas supplied by the air circuit are mixed in the flame tube nozzle assembly to form an atomization space and enter the combustion chamber of the combustion chamber casing.

[0008] During operation, fuel is supplied to the flame tube nozzle assembly through the fuel pipeline and the nozzle. The fuel in the curved oil path inside the flame tube nozzle assembly is mixed with the high-pressure gas entering from the gas path to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertia force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality. It avoids uneven atomization, the presence of large droplets after atomization or large diameter of atomized particles, ensures the reliability of ignition and uniform temperature field at the combustion chamber outlet, and prolongs the service life of the combustion chamber. The pneumatic atomization structure is adopted to ensure good fuel atomization performance, uniform oil and gas mixing, and reduce carbon deposits and smoke.

[0009] The invention solves the problems of the traditional atomization structure of the engine fuel nozzle, such as poor atomization quality, easy formation of carbon deposits and uneven circumference of the fuel.

[0010] In the main fuel nozzle atomization structure of the present invention: the fuel pipeline is detachably connected to the nozzle.

[0011] A further solution is that the fuel pipeline is detachably connected to the nozzle via a nut, and then the fuel enters the flame tube nozzle assembly via the fuel pipeline and the nozzle.

[0012] In the main fuel nozzle atomization structure of the present invention: the nozzle is detachably mounted on the combustion chamber casing.

[0013] The nozzle thread is detachably mounted on the combustion chamber casing.

[0014] The nozzle is inserted into the combustion chamber casing fuel joint and is detachably mounted on the combustion chamber casing by utilizing the threads of the combustion chamber casing fuel joint.

[0015] In the main fuel nozzle atomization structure of the present invention: the flame tube nozzle assembly is provided with a mixing pipe connecting the oil circuit and the gas circuit, which is used to mix the fuel provided by the nozzle and the high-pressure gas provided by the gas circuit therein to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertial force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality; it avoids uneven atomization, large droplets after atomization or large diameter of atomized particles, ensures the reliability of ignition and uniform temperature field at the combustion chamber outlet, and prolongs the service life of the combustion chamber.

[0016] Compared with the prior art, the main fuel nozzle atomization structure of the present invention comprises a nozzle installed on the combustion chamber casing; the nozzle is connected to a fuel pipeline; the structure also comprises a flame tube nozzle assembly, the nozzle is inserted into the interior of the flame tube nozzle assembly, and the fuel enters the interior of the flame tube nozzle assembly through the fuel pipeline and the nozzle; the flame tube nozzle assembly is provided with an air circuit, and the air circuit is used to supply high-pressure gas; an oil circuit is provided at the front end of the flame tube nozzle assembly, and the oil circuit includes an expansion nozzle, and the fuel provided by the nozzle and the high-pressure gas supplied by the air circuit are mixed in the flame tube nozzle assembly to form an atomization space and enter the combustion chamber; during the working process, the fuel is The pipeline and nozzle provide fuel for the flame tube nozzle assembly. The fuel in the curved oil path inside the flame tube nozzle assembly is mixed with the high-pressure gas entering from the gas path to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertia force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality. It avoids uneven atomization, large droplets after atomization or large diameter of atomized particles, ensures ignition reliability and uniform temperature field at the combustion chamber outlet, and prolongs the service life of the combustion chamber. The pneumatic atomization structure is adopted to ensure good fuel atomization performance, uniform oil and gas mixing, and reduce carbon deposition and smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the main fuel nozzle atomization structure of the present invention.

[0018] In the figure: 1- fuel pipeline; 2- nut; 3- combustion chamber casing fuel joint; 4- nozzle; 5- flame tube nozzle assembly. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below in conjunction with specific implementations. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] The purpose of the present invention is to provide a main fuel nozzle atomization structure to solve the problems of poor atomization quality, easy formation of carbon deposits, and uneven circumferential distribution of fuel in the conventional nozzle atomization structure for the engine fuel nozzle. To achieve the above purpose, the present invention provides the following technical solutions:

[0021] In the embodiment of the present invention, Figure 1 As shown, a main fuel nozzle atomization structure includes a nozzle 4 installed on a combustion chamber casing; the nozzle 4 is connected to a fuel pipeline 1;

[0022] The structure also includes a flame tube nozzle assembly 5, a nozzle 4 is inserted into the interior of the flame tube nozzle assembly 5, and the fuel enters the interior of the flame tube nozzle assembly 5 through the fuel pipeline 1 and the nozzle 4; the flame tube nozzle assembly 5 is provided with an air circuit, and the air circuit is used to supply high-pressure gas; the front end of the flame tube nozzle assembly 5 is provided with an oil circuit, and the oil circuit includes an expansion nozzle, and the fuel provided by the nozzle and the high-pressure gas supplied by the gas circuit are mixed in the flame tube nozzle assembly 5 to form an atomization space and enter the combustion chamber of the combustion chamber casing.

[0023] In the embodiment of the present invention, during operation, fuel is provided to the flame tube nozzle assembly 5 through the fuel pipeline 1 and the nozzle 4, and the fuel through the curved oil path inside the flame tube nozzle assembly 5 is mixed with the high-pressure gas entering from the gas path to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertial force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality; uneven atomization, the presence of large droplets after atomization or large diameter of atomized particles are avoided, the reliability of ignition and the uniformity of the combustion chamber outlet temperature field are ensured, and the service life of the combustion chamber is extended at the same time; a pneumatic atomization structure is adopted to ensure good fuel atomization performance, uniform oil and gas mixing, and reduced carbon deposition and smoke.

[0024] In the embodiment of the present invention, Figure 1 As shown, the fuel line 1 is detachably connected to the nozzle 4. The fuel line 1 is detachably connected to the nozzle 4 via a nut 2. Then, the fuel enters the interior of the flame tube nozzle assembly 5 through the fuel line 1 and the nozzle 4.

[0025] The nozzle 4 is detachably mounted on the combustion chamber casing. The nozzle 4 is threadably detachably mounted on the combustion chamber casing. The nozzle 4 is inserted into the combustion chamber casing fuel connector 3 and is threadably detachably mounted on the combustion chamber casing using the combustion chamber casing fuel connector 3.

[0026] In addition to being detachably mounted on the combustion chamber casing by threads, the nozzle 4 can also be detachably mounted on the combustion chamber casing by means of a fixing pin, or detachably mounted on the combustion chamber casing by means of a buckle, etc. The specific structure is not limited as long as it can meet the requirements of detachable installation.

[0027] In the embodiment of the present invention, Figure 1 As shown, the flame tube nozzle assembly 5 is provided with a mixing pipe connecting the oil circuit and the gas circuit, which is used to mix the fuel provided by the nozzle and the high-pressure gas provided by the gas circuit to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertia force to form fine and uniform atomized particles, with a wide stable combustion range, high ignition reliability and good outlet temperature field quality; it avoids uneven atomization, large droplets after atomization or large diameter of atomized particles, ensures the reliability of ignition and uniform temperature field at the combustion chamber outlet, and prolongs the service life of the combustion chamber.

[0028] Compared with the prior art, the main fuel nozzle atomization structure of the present invention comprises a nozzle 4 installed on the combustion chamber casing; the nozzle 4 is connected to a fuel pipeline 1; the structure also comprises a flame tube nozzle assembly 5, the nozzle 4 is inserted into the flame tube nozzle assembly 5, and the fuel enters the flame tube nozzle assembly 5 through the fuel pipeline 1 and the nozzle 4; the flame tube nozzle assembly 5 is provided with an air path, and the air path is used to supply high-pressure gas; the front end of the flame tube nozzle assembly 5 is provided with an oil path, and the oil path includes an expansion nozzle, and the fuel provided by the nozzle and the high-pressure gas supplied by the gas path are mixed in the flame tube nozzle assembly 5 to form an atomization space and enter the combustion chamber; during the working process, Fuel is provided to the flame tube nozzle assembly 5 through the fuel pipeline 1 and the nozzle 4. The fuel in the curved oil path inside the flame tube nozzle assembly 5 is mixed with the high-pressure gas entering from the gas path to form an atomization space. The high-pressure gas tears the sprayed fuel under the action of inertia force to form fine and uniform atomized particles, which have a wide stable combustion range, high ignition reliability and good outlet temperature field quality. It avoids uneven atomization, the presence of large droplets after atomization or large diameter of atomized particles, ensures the reliability of ignition and uniform temperature field at the combustion chamber outlet, and prolongs the service life of the combustion chamber. The pneumatic atomization structure is adopted to ensure good fuel atomization performance, uniform oil and gas mixing, and reduce carbon deposition and smoke.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A main fuel nozzle atomization structure, characterized in that: including a nozzle mounted on a combustion chamber casing; The nozzle is connected with a fuel pipeline; The structure also includes a flame tube nozzle assembly installed on the flame tube, the nozzle is inserted into the internal cavity of the flame tube nozzle assembly, and the fuel enters the internal cavity of the flame tube nozzle assembly through the fuel pipeline and the nozzle. The flame tube nozzle assembly is provided with a mixing tube connecting the oil circuit and the gas circuit. The front end opening of the mixing tube introduces high-pressure gas, and the rear end expansion nozzle of the mixing tube faces the combustion chamber. The internal cavity of the flame nozzle nozzle assembly is connected to the front end opening of the mixing tube through a curved oil circuit. The high-pressure gas and fuel provided by the front end opening of the mixing tube are mixed in the mixing tube to form an atomization space, and enter the combustion chamber for full combustion.

2. A main fuel nozzle atomization structure according to claim 1, characterized in that: The fuel pipeline is detachably connected to the nozzle.

3. A main fuel nozzle atomization structure according to claim 2, characterized in that: The fuel pipeline is detachably connected to the nozzle via a nut.

4. A main fuel nozzle atomization structure according to claim 1, characterized in that: The nozzle is detachably mounted on the combustion chamber casing.

5. A main fuel nozzle atomization structure according to claim 4, characterized in that: The nozzle thread is detachably mounted on the combustion chamber casing.

6. A main fuel nozzle atomization structure according to claim 5, characterized in that: The nozzle is inserted into the combustion chamber casing fuel joint and is detachably mounted on the combustion chamber casing by utilizing the threads of the combustion chamber casing fuel joint.

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