Large flow centrifugal single nozzle injector and steam generator

Abstract

The present invention provides a large flow centrifugal single nozzle injector and steam generator, which relates to the field of injectors. The injector includes a shell and a swirl chamber. The shell is fixed outside the swirl chamber and is surrounded by the peripheral wall of the swirl chamber to form an outer ring cavity for accommodating a first medium. The shell is provided with a first liquid inlet and a nozzle part connected to the outer ring cavity. The swirl chamber has a swirl cavity for accommodating a second medium. The swirl chamber has a second liquid inlet and a second nozzle connected to the swirl cavity. The second liquid inlet is tangent to the swirl cavity of the swirl chamber. The nozzle extends into the nozzle part and forms a first nozzle between the nozzle part and the outer wall. The first nozzle is an annular structure. The first medium can be sprayed out from the first nozzle in atomization and mixed with the second medium sprayed out from the second nozzle in atomization. The injector has a nozzle part, which is convenient for processing and has a low scrap rate. Alcohol and liquid oxygen are sprayed out from the nozzle part in a mixed manner to improve the atomization mixing effect.

Description

Technical Field

[0001] The invention relates to the technical field of injectors, and in particular to a large-flow centrifugal single-nozzle injector and a steam generator. Background Art

[0002] When a high-altitude engine is tested on the ground, it is usually necessary to place the engine in a vacuum chamber, and use a vacuum ejector to keep the nozzle outlet in a low-pressure state during the operation of the engine in the vacuum chamber to ensure full flow of the nozzle. Usually, the ejector uses water vapor as the ejector working fluid. If the traditional boiler method is used to produce water vapor, the system is large, complex, and costly. Therefore, a large-flow steam generator is required to provide the steam required for ejection. The reason why liquid oxygen alcohol steam generators have been used until now is that liquid oxygen is cheap and easier to handle than hydrogen peroxide. In addition, the experience accumulated in operating liquid oxygen / alcohol generators is more than that of operating hydrogen peroxide / hydrogen steam generators. The most important thing is that the steam pressure generated by liquid oxygen / alcohol generators is relatively high, which can fully meet the vacuum requirements.

[0003] The steam generator includes an injector and a combustion chamber. The main function of the injector is to inject propellant into the combustion chamber. The nozzle is the basic component of the injector. The nozzle is responsible for spraying a certain mass flow rate of propellant from the liquid collecting chamber into the combustion chamber, and atomizing, evaporating, mixing and burning are carried out in the combustion chamber to ensure the safety and stability of combustion.

[0004] At present, the injectors used in liquid oxygen alcohol steam generators generally adopt direct current injectors, and the flow rate of liquid oxygen alcohol steam generators is generally large. The injectors are generally designed as multi-nozzle injectors. The finer spray holes are conducive to liquid atomization and full combustion, and have good combustion stability.

[0005] The applicant has found that the prior art has at least the following technical problems: the processing of multi-nozzle DC injectors is very complicated, the inner diameter of the nozzle is small, and the nozzle processing accuracy is high. DC injectors with nozzles are generally formed as a whole, and an error in one nozzle will cause the entire injection panel to fail. The nozzles of centrifugal injectors have better atomization effects than DC nozzles at the same flow rate. Since the combustion flow field coupling of centrifugal injectors is more complicated, centrifugal injectors with the same number of nozzles will face a more difficult processing situation. Summary of the invention

[0006] The object of the present invention is to provide a large flow centrifugal single nozzle injector and steam generator to solve the technical problem that the injector in the prior art has a large number of nozzles, is difficult to process, and is difficult to achieve a large flow atomization effect. The preferred technical solutions among the many technical solutions provided by the present invention can produce a variety of technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The large flow centrifugal single nozzle injector provided by the present invention comprises a housing and a cyclone chamber, wherein:

[0009] The housing is fixed outside the cyclone chamber and forms an outer ring cavity for accommodating the first medium with the peripheral wall of the cyclone chamber. The housing is provided with a first liquid inlet and a nozzle part which are in communication with the outer ring cavity.

[0010] The cyclone chamber has a cyclone cavity for accommodating a second medium, the cyclone chamber has a second liquid inlet and a second nozzle connected to the cyclone cavity, and the second liquid inlet is tangent to the cyclone cavity of the cyclone chamber;

[0011] The second nozzle extends into the nozzle portion and forms a first nozzle with the outer wall of the nozzle portion. The first nozzle is an annular structure. The first medium can be sprayed out from the first nozzle in atomized form and mixed with the second medium sprayed out from the second nozzle in atomized form.

[0012] The spray angle of the second medium is greater than that of the first medium, so that the liquid films of the two media intersect; the spray angle of the second medium is 110°-130°, and the spray angle of the first medium is 80°-100°;

[0013] The diameters of the first nozzle and the second nozzle are:

[0014]

[0015] Among them, q mh For a given first medium or second medium flow rate, C dh is the flow coefficient of the first medium or the second medium, ρ is the density of the first medium or the second medium, and ΔP is the pressure drop in the first nozzle or the second nozzle.

[0016] Preferably, the second nozzle at least extends into the liquid inlet section of the nozzle portion, and the first medium and the second medium are mixed in the liquid outlet section of the nozzle portion.

[0017] Preferably, the first medium is alcohol, the second medium is liquid oxygen, and the liquid oxygen nozzle flow rate is , the alcohol nozzle flow rate is When the diameter of the second nozzle is h =14.56mm, the radius r of the second liquid inlet t =2.64mm, the swirl chamber radius , the diameter d of the nozzle portion h =19.4mm.

[0018] Preferably, the number of the second liquid inlets is one or more than two, and the second liquid inlets are arranged horizontally, so that the second medium is sprayed horizontally into the cyclone chamber.

[0019] Preferably, the housing comprises a first cylindrical section and a first conical section fixedly connected, wherein:

[0020] The first liquid inlet is located on the first cylindrical section, the inner diameter of the first conical section gradually decreases in a direction away from the first cylindrical section, and the nozzle portion is located at the narrow end of the first conical section.

[0021] Preferably, the cyclone chamber comprises a second cylindrical section and a second conical section which are fixedly connected, wherein:

[0022] The second liquid inlet is located on the second cylindrical section, the inner diameter of the second tapered section gradually decreases in a direction away from the second cylindrical section, and the second nozzle is located at the narrow end of the second tapered section.

[0023] Preferably, a vortex finder is fixed on the outer wall of the vortex chamber, and the vortex finder includes an external threaded protrusion, which is fixed on the outer wall of the vortex chamber and abuts against the inner wall of the outer shell to guide the first medium to flow in a spiral shape in the outer ring cavity toward the nozzle portion.

[0024] Preferably, the inner diameter of the second liquid inlet is:

[0025]

[0026] Where n is the number of the second liquid inlet, A is the geometric characteristics of the second nozzle, r h is the inner diameter of the second nozzle, R t is the distance from the axis of the second liquid inlet to the center of the swirl chamber;

[0027] Among them, A is obtained from the relationship diagram between the flow coefficient, injection angle and effective cross-sectional area coefficient and the nozzle geometric characteristics according to the given injection angle.

[0028] Preferably, the shell includes an injection panel fixedly connected to the combustion chamber, a water chamber is formed in the injection panel, and a water spray hole is arranged on the injection panel. The water spray hole is connected to the water chamber and is arranged toward the combustion chamber.

[0029] The present invention also provides a steam generator, characterized in that it includes a combustion chamber and the above-mentioned large-flow centrifugal single-nozzle injector, the combustion chamber is fixedly connected to the large-flow centrifugal single-nozzle injector, and the atomized first medium and second medium can be sprayed into the combustion chamber after mixing.

[0030] The large flow centrifugal single nozzle injector and steam generator provided by the present invention have the following beneficial effects compared with the prior art: alcohol as the first medium enters the outer ring cavity from the first liquid inlet, and liquid oxygen as the second medium enters the swirl cavity from the tangential second liquid inlet. The second medium has a horizontal initial velocity and collides with the inner wall of the swirl chamber and descends in a spiral shape until the second medium is ejected from the second nozzle. When the alcohol is ejected from the annular first nozzle, it mixes with the second medium, thereby improving the atomization mixing effect; and the injector has a nozzle part, which is convenient for processing and has a low scrap rate compared with multiple nozzles with smaller diameters in the prior art; and alcohol and liquid oxygen are mixed and ejected from the nozzle part, thereby improving the atomization mixing effect. After experimental verification, the injector has good atomization effect and combustion stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of a large flow centrifugal single nozzle injector;

[0033] Figure 2 Schematic diagram of the spray angles of the first medium and the second medium;

[0034] Figure 3 Schematic diagram of the external structure of the vortex chamber;

[0035] Figure 4 is a schematic diagram of the cross-sectional structure of the vortex chamber;

[0036] Figure 5 It is a schematic diagram of the duplex structure of the vortex chamber;

[0037] Figure 6 It is a graph showing the relationship between the flow coefficient, injection angle and effective cross-sectional area coefficient and the nozzle geometric characteristics.

[0038] In the figure, 1 is a shell; 10 is a nozzle part; 11 is a spray panel; 111 is a water spray hole; 12 is a water chamber; 13 is a locking hole; 2 is a swirl chamber; 20 is a second nozzle; 21 is a swirl chamber; 211 is a second cylindrical section; 212 is a second conical section; 22 is a second liquid inlet; 23 is a cover plate; 3 is a vortex generator; 31 is an external threaded protrusion; 4 is a pressure measuring part; 5 is an outer ring cavity; 50 is a first nozzle; 51 is a first cylindrical section; 52 is a first conical section; 53 is a first liquid inlet. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] The embodiment of the present invention provides a large-flow centrifugal single-nozzle injector and a steam generator. The injector is easy to process and has a low scrap rate. Alcohol and liquid oxygen are mixed and sprayed out from the nozzle portion, thereby improving the atomization mixing effect.

[0042] Combine the following Figure 1-Figure 6 The technical solution provided by the present invention is described in more detail.

[0043] Embodiment 1:

[0044] like Figure 1 and Figure 2 As shown, the large flow centrifugal single nozzle injector provided by the present invention comprises a shell and a swirl chamber, wherein: the shell 1 is fixed outside the swirl chamber 2, and is surrounded by the peripheral wall of the swirl chamber 2 to form an outer ring cavity 5 for accommodating a first medium, and the shell 1 is provided with a first liquid inlet 53 and a nozzle portion 10 connected with the outer ring cavity 5; the swirl chamber 2 has a swirl cavity 21 for accommodating a second medium, and the swirl chamber 2 has a second liquid inlet 22 and a second nozzle 20 connected with the swirl cavity 21, and the second liquid inlet 22 is tangent to the swirl cavity 21 of the swirl chamber 2; the second nozzle 20 extends into the nozzle portion 10, and forms a first nozzle 50 between the nozzle portion 10 and the outer wall, and the first nozzle 50 is an annular structure, and the first medium can be sprayed out from the first nozzle 50 in atomization, and mixed with the second medium sprayed out from the second nozzle 20. See Figure 1 As shown, the swirl chamber 2 is sealed by a cover plate 23 .

[0045] Large flow refers to the flow of a single nozzle medium is more than 100g / s. The larger the flow, the more difficult it is to organize the flow field. It is more difficult to atomize with a large flow. The design of centrifugal nozzles with a flow rate exceeding 600g / s is particularly difficult. Therefore, most centrifugal nozzles in the prior art have a flow rate of less than 10g / s.

[0046] In this embodiment, the first medium is alcohol and the second medium is liquid oxygen, and this is used as an example for description in this embodiment.

[0047] The second nozzle 20 extends into the nozzle portion 10 , and the inner wall of the nozzle portion 10 cooperates with the outer wall of the second nozzle 20 to form an annular structure.

[0048] For details, see Figure 4 and Figure 5 As shown, the second liquid inlet 22 is tangent to the cyclone chamber 21 of the cyclone chamber 2. When liquid oxygen as the second medium enters the cyclone chamber 21 from the second liquid inlet 22, it has a certain horizontal initial velocity. The liquid oxygen flow continuously collides with the inner wall of the cyclone chamber 2, and at the same time, it spirally descends under the action of gravity until it is ejected from the second nozzle 20. Similarly, alcohol as the first medium enters the outer ring chamber 5 from the first liquid inlet 53, continuously collides with the inner wall and the outer wall of the outer ring chamber 5, and spirally descends under the action of gravity until it is ejected from the first nozzle 50.

[0049] The high-flow centrifugal single-nozzle injector in this embodiment has only one nozzle portion 10, and the nozzle portion 10 includes a first nozzle 50 and a second nozzle 20 arranged concentrically. The first medium is sprayed and atomized from the first nozzle 50, and the second medium is sprayed and atomized from the second nozzle 20, and mixed in the nozzle portion 10.

[0050] In this embodiment, alcohol as the first medium enters the outer ring cavity 5 from the first liquid inlet 53, and liquid oxygen as the second medium enters the swirl cavity 21 from the tangential second liquid inlet 22. The second medium has a horizontal initial velocity and collides with the inner wall of the swirl chamber 2 and descends in a spiral shape until the second medium is ejected from the second nozzle 20. When the alcohol is ejected from the annular first nozzle 50, it mixes with the second medium, thereby improving the atomization mixing effect; and the injector has a nozzle portion 10. Compared with multiple nozzles with smaller diameters in the prior art, the injector is easy to process and has a low scrap rate; and alcohol and liquid oxygen are mixed and ejected from the nozzle portion 10, thereby improving the atomization mixing effect.

[0051] As an optional implementation, the number of the second liquid inlet 22 is one or more than two, and the second liquid inlet 22 is horizontally arranged, so that the second medium is sprayed into the cyclone chamber 21 horizontally.

[0052] See also Figure 5As shown, in this embodiment, there are two second liquid inlets 22, which are located on opposite sides of the cyclone chamber 21, so as to ensure the liquid inlet flow rate of the second medium (liquid oxygen).

[0053] As an alternative embodiment, see Figure 2 As shown, the housing 1 includes a first cylindrical section 51 and a first conical section 52 which are fixedly connected, wherein: the first liquid inlet 53 is located on the first cylindrical section 51, the inner diameter of the first conical section 52 gradually decreases in a direction away from the first cylindrical section 51, and the nozzle portion 10 is located at the narrow end of the first conical section 52.

[0054] When the first medium (alcohol) flows from the first cylindrical section 51 and the first conical section 52 to the nozzle portion 10 , the flow rate of the first medium increases due to the gradual decrease in the tube diameter, thereby improving the atomization effect when spraying from the first nozzle 50 .

[0055] See also Figure 2 As shown, the cyclone chamber 2 includes a second cylindrical section 211 and a second conical section 212 which are fixedly connected, wherein: the second liquid inlet 22 is located on the second cylindrical section 211, the inner diameter of the second conical section 212 gradually decreases in a direction away from the second cylindrical section 211, and the second nozzle 20 is located at the narrow end of the second conical section 212. When the second medium (liquid oxygen) flows from the second cylindrical section 211 and the second conical section 212 to the nozzle portion 10, the flow rate of the second medium increases due to the gradual decrease in the pipe diameter, which facilitates improving the atomization effect when sprayed from the second nozzle 20.

[0056] As an alternative embodiment, see Figure 1 and Figure 3 As shown, a vortex finder 3 is fixed on the outer wall of the vortex chamber 2. The vortex finder 3 includes an external threaded protrusion 31. The external threaded protrusion 31 is fixed on the outer wall of the vortex chamber 2 and abuts against the inner wall of the shell 1 to guide the first medium to flow in a spiral shape in the outer ring cavity 5 toward the nozzle portion 10.

[0057] Alcohol as the first medium enters the outer ring cavity 5 from the first liquid inlet 53 . Under the guidance of the external thread protrusion 31 , the first medium descends in a spiral shape until it is ejected from the first nozzle 50 , which can facilitate the stable descent of the first medium and reduce the turbulence of the first medium in the outer ring cavity 5 .

[0058] In order to improve the atomization mixing effect of the first medium and the second medium, see Figure 1 and Figure 2 As shown, as an optional embodiment, the second nozzle 20 at least extends into the liquid inlet section of the nozzle part 10, and the first medium and the second medium are mixed in the liquid outlet section of the nozzle part 10; the injection angle of the second medium is greater than the injection angle of the first medium, thereby causing the liquid films of the two media to intersect.

[0059] The "injection angle" refers to the angle at which the medium is radially ejected from the corresponding nozzle, that is, the cone angle of the corresponding liquid film. When the injection angle of the second medium is greater than the injection angle of the first medium, the liquid films of the first and second media can intersect, further improving the atomization mixing effect and making the liquid films of the first medium (alcohol) and the second medium (liquid oxygen) fully mixed.

[0060] As an optional embodiment, the spray angle α2 of the second medium is 110°-130°, and the spray angle α1 of the first medium is 80°-100°; preferably, the spray angle α2 of the second medium is 120°, and the spray angle α1 of the first medium is 90°.

[0061] How to obtain the injection angles of the first medium and the second medium is related to the size of the large-flow centrifugal single-nozzle injector.

[0062] For details, see Figure 6 As shown in FIG. 1 , according to the relationship diagram between the flow coefficient, the injection angle, the effective cross-sectional area coefficient and the nozzle geometric characteristics, after determining the injection angle of the first medium and the second medium, the corresponding flow coefficient C of the first medium or the second medium can be obtained. dh , corresponding to the geometric characteristics A of the nozzle.

[0063] The diameters of the first nozzle 50 and the second nozzle 20 are:

[0064]

[0065] Among them, q mh For a given first medium or second medium flow rate, C dh is the flow coefficient of the first medium or the second medium, ρ is the density of the first medium or the second medium, and ΔP is the pressure drop in the first nozzle 50 or the second nozzle 20. The diameters of the first nozzle 50 and the second nozzle 20 can be calculated according to the above formula.

[0066] As an optional embodiment, the inner diameter of the second liquid inlet 22 is:

[0067]

[0068] Wherein, n is the number of the second liquid inlet ports 22, A is the geometric characteristic of the second nozzle 20, and r h is the inner diameter of the second nozzle 20, R t is the distance from the axis of the second liquid inlet 22 to the center of the swirl chamber 21; wherein A is obtained from the relationship diagram of the flow coefficient, the injection angle, the effective cross-sectional area coefficient and the nozzle geometric characteristics according to the given injection angle, as shown in the figure. The relationship diagram of the flow coefficient, the injection angle, the effective cross-sectional area coefficient and the nozzle geometric characteristics is existing common knowledge.

[0069] In the prior art, water is also used as a component of steam, and water is injected from the combustion chamber. The temperature of the injector is high and needs to be cooled.

[0070] As an alternative embodiment, see Figure 1 and Figure 2 As shown, the housing 1 includes an injection panel 11 for fixedly connecting with the combustion chamber, a water chamber 12 is formed in the injection panel 11, and a water injection hole 111 is arranged on the injection panel 11, the water injection hole 111 is connected with the water chamber 12 and arranged toward the combustion chamber. Figure 1 As shown, a locking hole 13 is provided on the housing 1, and a locking member passes through the locking hole 13 to fix the housing 1 to the combustion chamber.

[0071] Water is filled in the water chamber 12. After the injection panel 11 is fixed to the combustion chamber, it can isolate heat, cool the shell 1, prevent the temperature from being too high, and improve the cooling effect. The water in the water chamber 12 can be sprayed into the combustion chamber from the water spray hole 111 to provide steam components.

[0072] Using water as the medium, water is introduced into the alcohol and liquid oxygen nozzles at the same time. Liquid oxygen, alcohol and water are mixed through collision, and the mixed state is relatively uniform.

[0073] See also Figure 1 As shown, the cyclone chamber 2 and the housing 1 are provided with pressure measuring parts 4 for measuring the pressure of the cyclone cavity 21 and the outer ring cavity 5 respectively.

[0074] Specifically, various parameters of the injector are confirmed to ensure a large flow atomization effect.

[0075] Liquid oxygen: Given liquid oxygen nozzle flow rate: , select the pressure drop of the second nozzle 20: , select the injection angle: , Physical properties of liquid oxygen: Density: Viscosity: .

[0076] Alcohol: Given alcohol nozzle flow rate: ; Select the first nozzle 50 pressure drop: Select the spray angle: ; Physical properties of alcohol: Density: Viscosity: ;

[0077] Water: Given the injector water flow: ; Select the pressure drop of water spray hole 111: .

[0078] (3) Determination of centrifugal nozzle structural parameters

[0079] Liquid oxygen:

[0080] According to the given injection angle, find the flow coefficient of the corresponding α value on the graph , and geometric properties ;

[0081] The diameter of the second nozzle 20:

[0082]

[0083] According to the external dimension requirements, select ; r h is the inner diameter of the second nozzle 20, R t is the distance from the axis of the second liquid inlet 22 to the center of the swirl chamber 21; the number of tangential holes is selected .

[0084] Calculate the radius of the second liquid inlet 22:

[0085] Wherein, n is the number of the second liquid inlet ports 22, A is the geometric characteristic of the second nozzle 20, and r h is the inner diameter of the second nozzle 20, R t It is the distance from the axis of the second liquid inlet 22 to the center of the swirl chamber 21.

[0086] Cyclone room radius .

[0087] Alcohol: According to the given injection angle, find the flow coefficient corresponding to the α value on the graph , and geometric properties ;

[0088] Diameter of the nozzle portion 10:

[0089] Select the number of vortex flow generator threads as ; Select the vortex flow device thread lead angle ; Normal cross-sectional area of ​​vortex generator thread groove:

[0090]

[0091] Outer diameter of vortex flow collector 3 ; Inner diameter of vortex flow device 3 ; Select the length of vortex generator 3 .

[0092] Water: Based on the given flow rate and pressure drop, the flow coefficient Design. Design 30 water spray holes 111, the diameter of the water spray holes 111 is:

[0093]

[0094] The injector was subjected to a liquid flow test, and the pre-spray pressure and pipeline flow of liquid oxygen and alcohol were monitored. Pressure drop-flow data were obtained through multiple tests. The actual flow coefficient of the nozzle was calculated by the relationship between nozzle flow and pressure drop. The liquid flow test requires ensuring the inlet pipeline flow and a certain inlet pressure, otherwise the liquid film cannot reach the predetermined state.

[0095] The liquid oxygen flow data is as follows. After calculation, the actual , which is close to 0.1 in the design state. Its spray angle is about 120°, which is basically consistent with the design state. At the same time, it is observed that its liquid film is relatively uniform and the atomization state is good.

[0096] Table 1 Liquid flow data of the second nozzle 20 (liquid oxygen) of the injector

[0097]

[0098] The alcohol flow data is as follows. After calculation, the actual , which is close to the design state of 0.35. Its injection angle is about 95°, which is basically close to the design state of 90°.

[0099] Table 2 Liquid flow data of the first nozzle 50 (alcohol) of the injector

[0100]

[0101] The large-flow centrifugal single-nozzle injector of this embodiment can be applied to larger injectors, providing a reference for the design of 100kg / s-class injectors, which can greatly reduce the cost of the injectors.

[0102] Embodiment 2:

[0103] This embodiment provides a steam generator, including a combustion chamber and the above-mentioned large-flow centrifugal single-nozzle injector, the combustion chamber is fixedly connected to the large-flow centrifugal single-nozzle injector, and the atomized first medium and second medium can be sprayed into the combustion chamber after mixing.

[0104] Since the steam generator is provided with the large-flow centrifugal single-nozzle injector, it can improve the atomization effect and the steam effect under the premise of ensuring a large flow.

[0105] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0106] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0107] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-flow centrifugal single-nozzle injector, characterized in that: It includes a housing and a cyclone chamber, wherein: The housing is fixed outside the cyclone chamber and forms an outer ring cavity for accommodating the first medium with the peripheral wall of the cyclone chamber. The housing is provided with a first liquid inlet and a nozzle part which are in communication with the outer ring cavity. The cyclone chamber has a cyclone cavity for accommodating a second medium, the cyclone chamber has a second liquid inlet and a second nozzle connected to the cyclone cavity, and the second liquid inlet is tangent to the cyclone cavity of the cyclone chamber; The second nozzle extends into the nozzle portion and forms a first nozzle with the outer wall of the nozzle portion. The first nozzle is an annular structure. The first medium can be sprayed out from the first nozzle in atomized form and mixed with the second medium sprayed out from the second nozzle in atomized form. The spray angle of the second medium is greater than that of the first medium, so that the liquid films of the two media intersect; the spray angle of the second medium is 110°-130°, and the spray angle of the first medium is 80°-100°; The diameters of the first nozzle and the second nozzle are: Among them, q mh For a given first medium or second medium flow rate, C dh is the flow coefficient of the first medium or the second medium, ρ is the density of the first medium or the second medium, △P is the pressure drop in the first nozzle or the second nozzle; The inner diameter of the second liquid inlet is: Where n1 is the number of the second liquid inlet, A is the geometric characteristics of the second nozzle, r h is the inner diameter of the second nozzle, R t is the distance from the axis of the second liquid inlet to the center of the swirl chamber; Where A is obtained from the relationship between the flow coefficient, injection angle and effective cross-sectional area coefficient and the nozzle geometric characteristics according to the given injection angle; A vortex finder is fixed on the outer wall of the vortex chamber, and the vortex finder includes an external thread protrusion, which is fixed on the outer wall of the vortex chamber and abuts against the inner wall of the shell, and is used to guide the first medium to flow in the outer ring cavity in a spiral shape toward the nozzle part; The normal cross-sectional area of ​​the vortex flow device thread groove is: Wherein, n2 is the number of thread heads of the vortex finder, and β is the thread lead angle of the vortex finder.

2. The high-flow centrifugal single-nozzle injector according to claim 1, characterized in that: The second nozzle at least extends into the liquid inlet section of the nozzle portion, and the first medium and the second medium are mixed in the liquid outlet section of the nozzle portion.

3. The high flow centrifugal single nozzle injector according to claim 1, characterized in that: The first medium is alcohol, the second medium is liquid oxygen, and the liquid oxygen nozzle flow rate is , the alcohol nozzle flow rate is When the diameter of the second nozzle is h =14.56mm, the radius r of the second liquid inlet t =2.64mm, the swirl chamber radius , the diameter d of the nozzle portion h =19.4mm.

4. The high-flow centrifugal single-nozzle injector according to claim 1, characterized in that: The number of the second liquid inlet is one or more than two, and the second liquid inlet is arranged horizontally, so that the second medium is sprayed horizontally into the cyclone chamber.

5. The high flow centrifugal single nozzle injector according to claim 1, characterized in that: The housing comprises a first cylindrical section and a first conical section fixedly connected, wherein: The first liquid inlet is located on the first cylindrical section, the inner diameter of the first conical section gradually decreases in a direction away from the first cylindrical section, and the nozzle portion is located at the narrow end of the first conical section.

6. The high-flow centrifugal single-nozzle injector according to claim 5, characterized in that: The cyclone chamber comprises a second cylindrical section and a second conical section which are fixedly connected, wherein: The second liquid inlet is located on the second cylindrical section, the inner diameter of the second tapered section gradually decreases in a direction away from the second cylindrical section, and the second nozzle is located at the narrow end of the second tapered section.

7. The high flow centrifugal single nozzle injector according to claim 1, characterized in that: The shell comprises an injection panel fixedly connected to the combustion chamber, a water chamber is formed in the injection panel, and a water spray hole is arranged on the injection panel. The water spray hole is connected to the water chamber and is arranged toward the combustion chamber.

8. A steam generator, characterized in that: It comprises a combustion chamber and a high-flow centrifugal single-nozzle injector as described in any one of claims 1 to 7, wherein the combustion chamber is fixedly connected to the high-flow centrifugal single-nozzle injector, and the atomized first medium and the second medium can be sprayed into the combustion chamber after mixing.

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