CN111894738A - Injection device, engine, and injection device design method - Google Patents
Injection device, engine, and injection device design method Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 108
- 239000007924 injection Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 239000007921 spray Substances 0.000 claims abstract description 26
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 230000002596 correlated effect Effects 0.000 claims abstract description 7
- 230000000875 corresponding effect Effects 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 32
- 230000000694 effects Effects 0.000 abstract description 26
- 239000000446 fuel Substances 0.000 description 16
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 238000000889 atomisation Methods 0.000 description 6
- 238000005474 detonation Methods 0.000 description 6
- 230000002708 enhancing effect Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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Abstract
The invention provides an injection device, an engine and a design method of the injection device, wherein the injection device is arranged on the inner wall of the engine and comprises a first manifold cavity, a second manifold cavity and a throttling channel; the first confluence cavity also comprises a supply channel which is used for being connected with a liquid working medium supply system; the first manifold cavity and the second manifold cavity are also respectively connected with a first spray hole and a second spray hole for spraying; the first confluence cavity is used for obtaining liquid working medium; the throttling channel is used for communicating the first confluence cavity with the second confluence cavity and conveying the liquid working medium in the first confluence cavity to the second confluence cavity in a throttling state; the throttling state represents that the ratio of the jetting pressure of the second manifold cavity to the jetting pressure of the first manifold cavity is smaller than a preset threshold value; the injection pressure is positively correlated to the injection depth. According to the invention, the throttling channel is designed under the condition of not changing a supply system, so that the injection pressures and the injection depths of the two confluence cavities are different, and the problems of single injection depth, poor mixing effect and the like are solved.
Description
Technical Field
The invention relates to the technical field of liquid jet atomization, in particular to an injection device, an engine and a design method of the injection device.
Background
In a power system for maintaining high-speed flight, a scramjet engine and a rotary detonation engine are ideal power devices and key technologies for air-breathing hypersonic flight. Both the two engines adopt liquid fuel for injection, the flow speed of high-temperature gas in a flow passage also reaches a supersonic speed state under a hypersonic speed condition, and the staying time of airflow in the engine is very short and is only millisecond-scale. When liquid fuel is used as working medium, the working state and combustion efficiency of the engine are directly influenced by the atomization, crushing, main flow mixing and other processes of the liquid jet.
At present, the injection of liquid fuel is realized by adopting a wall injection mode, but the wall injection mode has the problems of single injection depth, poor space mixing effect and the like, particularly when the size of a flow channel is large, the liquid jet cannot realize the mixing effect with a main flow in a large coverage area, and the combustion efficiency cannot be improved.
Disclosure of Invention
In view of the above, the present invention provides an injection device, an engine and a design method of the injection device, so as to solve the problems of single injection depth, poor spatial mixing effect and the like in the wall injection manner.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in a first aspect, the present invention provides an injection device disposed on an inner wall of an engine, the injection device including a first manifold chamber, a second manifold chamber, and a throttle passage; the first manifold chamber further comprises a supply passage; the supply channel is used for being connected with a liquid working medium supply system; one side of the first confluence cavity, which is close to the throttling channel, is connected with a first spray hole; one side of the second confluence cavity, which is close to the throttling channel, is connected with a second spray hole; the first spray hole is used for spraying the liquid working medium in the first confluence cavity; the second spray hole is used for spraying the liquid working medium in the second confluence cavity; the first confluence cavity is used for obtaining the liquid working medium provided by the liquid working medium supply system; the throttling channel is used for communicating the first confluence cavity with the second confluence cavity and conveying the liquid working medium in the first confluence cavity to the second confluence cavity in a throttling state; the throttling state represents that the ratio of the jetting pressure of the second manifold cavity to the jetting pressure of the first manifold cavity is smaller than a preset threshold value; the preset threshold is a positive number smaller than 1; the injection pressure is positively correlated with injection depth.
Optionally, a cross-sectional area of the first orifice and a cross-sectional area of the second orifice are equal; when the ratio of the cross-sectional area of the throttling channel to the cross-sectional area of the second jet hole is smaller than the preset threshold value, the throttling channel is in the throttling state; in the throttling state, the jetting depth of the first jet hole is larger than that of the second jet hole.
Optionally, the number of the first nozzle holes and the number of the second nozzle holes are multiple, and the number of the first nozzle holes is the same as that of the second nozzle holes; the cross-sectional area of the first jet hole is the sum of the cross-sectional areas of the first jet holes, and the cross-sectional area of the second jet hole is the sum of the cross-sectional areas of the second jet holes.
Optionally, a plurality of the first nozzle holes and a plurality of the second nozzle holes are located on the same cross section; the plurality of first nozzle holes and the plurality of second nozzle holes are arranged in a staggered mode.
Optionally, a plurality of the first nozzle holes and a plurality of the second nozzle holes are located on different cross sections; the first jet holes and the second jet holes are arranged oppositely or the first jet holes and the second jet holes are arranged in a staggered mode.
Optionally, the first manifold chamber is adjacent to the engine outlet; the second confluence cavity is close to the air inlet of the engine.
Optionally, the cross-section of the first nozzle hole and the cross-section of the second nozzle hole are both circular.
Optionally, the number of the second confluence chambers is plural, and any two of the second confluence chambers are communicated with each other through the throttling channel.
In a second aspect, the present invention provides an engine having an injector device as defined in the first aspect disposed in an interior wall of the engine.
In a third aspect, the invention provides a method for designing an injection device, wherein the injection device is applied to an engine; the injection device comprises a first confluence cavity, a second confluence cavity and a throttling channel; the throttling channel is used for communicating the first confluence cavity and the second confluence cavity; one side of the first confluence cavity, which is close to the throttling channel, is connected with a first spray hole; one side of the second confluence cavity, which is close to the throttling channel, is connected with a second spray hole; the method comprises the following steps: acquiring a working index parameter and a geometric structure parameter of the engine; determining a cross-sectional area and an injection pressure corresponding to the second injection hole and a cross-sectional area and an injection pressure corresponding to the first injection hole according to the working index parameter and the geometric structure parameter; determining the cross-sectional area of the throttling channel according to the cross-sectional area and the jetting pressure corresponding to the second jet hole, the cross-sectional area and the jetting pressure corresponding to the first jet hole; the ratio of the cross-sectional area of the throttling channel to the cross-sectional area of the second jet hole is smaller than the preset threshold value; the preset threshold is a positive number less than 1.
The embodiment of the invention provides an injection device, an engine and a design method of the injection device, wherein the injection device is arranged on the inner wall of the engine and comprises a first manifold cavity, a second manifold cavity and a throttling channel; the first manifold chamber further comprises a supply passage; the supply channel is used for being connected with a liquid working medium supply system; one side of the first confluence cavity close to the throttling channel is connected with a first spray hole; one side of the second confluence cavity close to the throttling channel is connected with a second spray hole; the first spray hole is used for spraying the liquid working medium in the first confluence cavity; the second spray hole is used for spraying the liquid working medium in the second confluence cavity; the first confluence cavity is used for obtaining liquid working medium provided by the liquid working medium supply system; the throttling channel is used for communicating the first confluence cavity with the second confluence cavity and conveying the liquid working medium in the first confluence cavity to the second confluence cavity in a throttling state; the throttling state represents that the ratio of the jetting pressure of the second manifold cavity to the jetting pressure of the first manifold cavity is smaller than a preset threshold value; the preset threshold is a positive number smaller than 1; the injection pressure is positively correlated to the injection depth. Compared with the prior art, the embodiment of the invention ensures that a throttling channel is designed between the two converging cavities in the jetting device under the condition of not adjusting a liquid working medium supply system, so that jetting pressures of the two converging cavities are different, jetting depths of liquid are also different, jetted liquid can be mixed in an engine with a better effect, and the problems of single jetting depth, poor space mixing effect and the like of liquid fuel in the prior art can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of an injector apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an injector device according to an embodiment of the present invention;
FIG. 3 is a schematic view of an arrangement of nozzles according to an embodiment of the present invention;
fig. 4 is a schematic view of another arrangement of the nozzle holes provided in the embodiment of the present invention;
fig. 5 is a schematic view of another arrangement of nozzle holes according to an embodiment of the present invention.
Icon: 10-an injection device; 101-a first manifold chamber; 102-a second manifold chamber; 103-a throttling channel; 1011-supply channel; 105-a first orifice; 106-second nozzle hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In a high-speed flight power system, a scramjet engine and a rotary detonation engine are ideal power devices and key technologies for air-breathing hypersonic flight, and are widely applied to the fields of aerospace planes, hypersonic airplanes, hypersonic cruise missiles and the like. The scramjet engine is an ideal power device and a key technology for air-breathing hypersonic flight, when the scramjet engine works under the hypersonic condition, the flow speed of high-temperature gas in a flow channel also reaches a supersonic speed state, and the staying time of gas flow in the engine is very short and is only millisecond-scale. When liquid fuel is used as working medium, the working state and combustion efficiency of the engine are directly influenced by the atomization, crushing, main flow mixing and other processes of the liquid jet. The rotary detonation engine is also one of the novel engines with extremely high thermal cycle efficiency at present, and when liquid fuel is adopted as a working medium, the detonation process of the rotary detonation engine extremely depends on the mixing level of the liquid working medium and steam thereof in an engine flow passage.
In the prior art, the injection of liquid fuel is realized by a main wall injection mode at present, but the wall injection mode has the problems of single injection depth, poor space mixing effect and the like, particularly when the size of a flow channel is large, the liquid jet cannot realize the large mixing effect of a coverage area with a main flow, and the combustion efficiency cannot be improved; when the bubble atomization jet injection is adopted in the structural form, an additional gas medium is required to be introduced, and the structural design is complex.
In order to solve the above technical problem, an embodiment of the present invention provides an injection device, which includes: through the design of the throttling channel and the realization of the area matching between the throttling channel and the spray hole, the mixing effect is enhanced, and through the structural design, the aim of enhancing the mixing effect and the mixing area of the liquid fuel and the main flow is realized by utilizing the characteristic of pressure self-adaptive adjustment in hydrodynamics on the premise of not changing a supply system and increasing additional working media and complex structural design.
To facilitate understanding of the implementation principle of the embodiment of the present invention for enhancing the blending effect, please refer to fig. 1, fig. 1 is a top view of an injection device provided by the embodiment of the present invention, wherein the injection device 10 may be disposed on an inner wall of an engine, and includes a first manifold chamber 101, a second manifold chamber 102 and a throttle passage 103; wherein the first manifold chamber 101 further comprises a supply channel 1011; the supply channel 1011 is used for connecting with a liquid working medium supply system to obtain a liquid working medium provided by the liquid working medium supply system, and the liquid working medium can be liquid fuel; one side of the first converging cavity 101 close to the throttling channel 103 is connected with a first jet hole 105; one side of the second converging cavity 102 close to the throttling channel 103 is connected with a second jet hole 106; the first jet hole 105 is used for jetting the liquid working medium in the first confluence cavity 101; and the second jet hole 106 is used for jetting the liquid working medium in the second confluence cavity 102.
For the sake of easy understanding of the structure of the injection device shown in fig. 1, two cross-sectional views of the injection device shown in fig. 1 are given below, see fig. 2, and fig. 2 is a cross-sectional view of an injection device according to an embodiment of the present invention.
And the first confluence chamber 101 is used for obtaining the liquid working medium provided by the liquid working medium supply system.
And the throttling channel 103 is used for communicating the first confluence cavity 101 and the second confluence cavity 102 and conveying the liquid working medium in the first confluence cavity 101 to the second confluence cavity 102 in a throttling state. The throttle state represents that the ratio of the injection pressure of the second manifold 102 to the injection pressure of the first manifold 101 is less than a preset threshold; the preset threshold value is a positive number smaller than 1; the injection pressure is positively correlated to the injection depth.
In the embodiment of the present invention, it can be understood from the knowledge of fluid mechanics that when a section is throttled by a liquid, the flow rate passing through the section is only related to the section area and the upstream pressure, but not to the downstream pressure, and when the ratio of the downstream pressure to the upstream pressure of the section is smaller than a specific value a, the section is throttled, which is related to the structural parameters upstream and downstream of the section, generally a ≈ 0.8, therefore, it can be understood that, in the embodiment of the present invention, since the first manifold chamber 101 is connected to the liquid medium supply system, the first manifold chamber 101 can be regarded as being fluid upstream, the second manifold chamber 102 can be regarded as being fluid downstream, and when the ratio of the downstream pressure to the upstream pressure of the section of the throttle passage 103 is smaller than a specific value when the liquid medium in the first manifold chamber 101 flows to the second manifold chamber 102 through the throttle passage 103, the flow of the throttling channel 103 may reach a throttling state, and it may also be understood that, when a ratio between an injection pressure of the second manifold 102 and an injection pressure of the first manifold 101 is smaller than a preset threshold, the flow of the throttling channel 103 may reach the throttling state, where the preset threshold may be 0.8, and since the injection pressure is positively correlated with the injection depth, when the ratio between the injection pressure of the second manifold 102 and the injection pressure of the first manifold 101 is smaller than the preset threshold, the injection depth of the second manifold 102 is smaller than the injection depth of the first manifold 101, and since the injection depths of the two manifolds are different, injected liquid may be mixed effectively inside the engine, so that problems of single injection depth, poor spatial mixing effect, and the like of liquid fuel in the prior art may be improved.
The injection device provided by the embodiment of the invention is arranged on the inner wall of an engine and comprises a first manifold cavity, a second manifold cavity and a throttling channel; the first manifold chamber further comprises a supply passage; the supply channel is used for being connected with a liquid working medium supply system; one side of the first confluence cavity close to the throttling channel is connected with a first spray hole; one side of the second confluence cavity close to the throttling channel is connected with a second spray hole; the first spray hole is used for spraying the liquid working medium in the first confluence cavity; the second spray hole is used for spraying the liquid working medium in the second confluence cavity; the first confluence cavity is used for obtaining liquid working medium provided by the liquid working medium supply system; the throttling channel is used for communicating the first confluence cavity with the second confluence cavity and conveying the liquid working medium in the first confluence cavity to the second confluence cavity in a throttling state; the throttling state represents that the ratio of the jetting pressure of the second manifold cavity to the jetting pressure of the first manifold cavity is smaller than a preset threshold value; the injection pressure is positively correlated to the injection depth. Compared with the prior art, the embodiment of the invention ensures that the jetting pressures of the two converging cavities are different and the jetting depths of the liquid are different only by designing the throttling channel under the condition that the liquid working medium supply system is not adjusted, so that the jetted liquid can be mixed with a better effect in the engine, and the problems of single jetting depth, poor space mixing effect and the like of the liquid fuel in the prior art can be solved.
Optionally, in the supersonic airflow, because there is a phenomenon that the mixing effect is affected by bow shock waves generated by mutual interference of the liquid jet and the supersonic incoming flow, in general, the injection pressure corresponding to the injection hole arranged at the upstream position (gas entering direction) of the incoming flow gas is relatively low, and the injection pressure corresponding to the injection hole arranged at the downstream position (gas leaving direction) of the incoming flow gas is relatively high, so that the first manifold cavity 101 in the embodiment of the present invention may be close to the engine gas outlet (gas leaving direction), and the second manifold cavity 102 is close to the engine gas inlet (gas entering direction), so as to further ensure that the injection pressure of the first manifold cavity 101 is greater than the injection pressure of the second manifold cavity 102.
Optionally, in the embodiment of the present invention, the first manifold cavity 101 and the second manifold cavity are further respectively connected with an orifice, the orifice may spray a liquid working medium inside the manifold cavity, and meanwhile, due to the design of the throttling channel, the cross-sectional area of the throttling channel needs to be matched with the cross-sectional area of the orifice of the second manifold cavity, so that the flow rate of the throttling channel can reach the throttling state, and meanwhile, the jetting pressure of the first manifold cavity 101 is greater than the jetting pressure of the second manifold cavity 102, so a possible implementation manner is given below, that is:
the cross-sectional area of the first nozzle hole 105 and the cross-sectional area of the second nozzle hole 106 are equal; when the ratio of the cross-sectional area of the throttling channel 103 to the cross-sectional area of the second jet hole 106 is smaller than a preset threshold value, the throttling channel is in a throttling state; in the throttled state, the injection depth of the first nozzle hole 105 is greater than the injection depth of the second nozzle hole 106.
In the embodiment of the present invention, according to the knowledge of fluid mechanics, the flow rate corresponding to the throttling state of the liquid flowing through a cross section can be obtained according to the relation (1):
wherein
Flow is characterized, mu represents a flow coefficient, and can be determined through multiple tests in an actual application scene; a represents the minimum flow area of a cross section through which the liquid flows; p represents the fluid density; p represents the corresponding pressure upstream of the minimum section; pvThe saturated vapor pressure of the liquid is characterized, and is generally from several to dozens of thousands of the liquid at normal temperaturePa, negligible compared to liquid injection pressure.
In the embodiment of the present invention, it is assumed that the total area of the first nozzle holes 105 connected to the first manifold chamber 101 is AAThe total area of the second nozzle holes 106 connected to the second manifold chamber 102 is ABThe area of the throttle passage 103 is AtWherein A isA＝AB(ii) a By the realization of AtAnd ABThe flow rates of the first and second converging cavities 101 and 102 and the throttling channel 103 can reach a throttling state by area matching, and at this time, the flow rates of the first and second converging cavities 101 and 102 and the throttling channel 103 can be obtained according to a relation (1), which is respectively a relation (2), (3) and (4):
wherein,
which is the flow rate of the first manifold chamber 101,
is the flow rate of the second manifold chamber 102,
the flow rate of the throttling channel is the maximum flow rate flowing through the throttling channel, namely the flow rate flowing into the second converging cavity 102 when the flow rate of the throttling channel reaches the throttling state at the moment, so that the flow rate of the throttling channel is the maximum flow rate flowing into the second converging cavity 102
According to the above relations (2), (3) and (4), when A ist<a2*ABWhen the temperature of the water is higher than the set temperature,
when a is 0.8, the throttle passage 103 reaches a throttle state, and PA＝PtFrom this, it is obtained that the relationship between the pressures of the first manifold chamber 101 and the second manifold chamber 102 is as shown in the relation (5):
according to the relation (5), when A ist<AB＝AACan realize PA>PBThat is, the injection pressure of the nozzle holes connected to the first manifold cavity 101 is greater than the injection pressure of the nozzle holes connected to the second manifold cavity 102, so that the injection depth and the atomization range of the corresponding nozzle holes are different in this state, and the mixing range with the main stream is supplemented and expanded, thereby achieving the effect of enhancing the mixing area of the liquid fuel jet and the main stream.
Optionally, as can be seen from fig. 1, the number of the first nozzle holes 105 and the number of the second nozzle holes 106 are multiple, and the number of the first nozzle holes 105 is the same as that of the second nozzle holes 106; the cross-sectional area of the first nozzle hole 105 is the sum of the cross-sectional areas of the plurality of first nozzle holes 105, and the cross-sectional area of the second nozzle hole 106 is the sum of the cross-sectional areas of the plurality of second nozzle holes 106.
Alternatively, the cross sections of the first nozzle hole 105 and the second nozzle hole 106 of the above embodiments are both circular.
Optionally, in order to ensure the blending effect, there may be a plurality of arrangement manners of the first nozzle holes and the second nozzle holes, for convenience of understanding, refer to fig. 3, and fig. 3 is a schematic diagram of an arrangement manner of nozzle holes provided in an embodiment of the present invention. The plurality of first nozzle holes 105 and the plurality of second nozzle holes 106 may be located at the same gas flow direction section, and the first nozzle holes 105 and the second nozzle holes 106 may be alternately arranged.
In the embodiment of the present invention, since the positions of the first nozzle hole 105 and the second nozzle hole 106 are in the same gas flow direction cross section, only the injection state is ensured to be different, that is, only P is ensuredA≠PBCan be used for curingThe jetting pressures of the two groups of jet holes are different, and the corresponding jetting depths and the atomizing ranges are different, so that the effect of enhancing the mixing of the fuel jet and the main stream is achieved.
Optionally, in order to ensure the blending effect, the arrangement of the first nozzle holes and the second nozzle holes may also be as shown in fig. 4, where fig. 4 is a schematic view of another arrangement of nozzle holes provided in an embodiment of the present invention. The plurality of first nozzle holes 105 and the plurality of second nozzle holes 106 may be located at different gas flow direction sections, and the first nozzle holes 105 and the second nozzle holes 106 are arranged alternately.
In the embodiment of the present invention, since the first nozzle holes 105 and the second nozzle holes 106 are arranged in a staggered manner, when the first nozzle holes 105 perform injection, the injection range may be extended to be within the gap range of the second nozzle holes 106.
Optionally, in order to ensure the blending effect, the arrangement of the first nozzle holes and the second nozzle holes may also be as shown in fig. 5, where fig. 5 is a schematic view of another arrangement of nozzle holes provided in an embodiment of the present invention. The plurality of first nozzle holes 105 and the plurality of second nozzle holes 106 may be located at different gas flow direction sections with the first nozzle holes 105 and the second nozzle holes 106 being arranged to face each other.
In the embodiment of the invention, in order to ensure the blending effect, the distance between the cross sections of the first nozzle holes 105 and the second nozzle holes 106 can be set according to actual conditions, so that the effects of zone atomization and blending enhancement can be realized.
It should be noted that, for the arrangement mode 2 and the arrangement mode 3, the first nozzle holes 105 and the second nozzle holes 106 are located on different cross sections of the gas flow direction, and it is only necessary to ensure that the pressure of the second nozzle holes 106 is smaller than the pressure of the first nozzle holes 105, and it is necessary to ensure matching of the nozzle hole area and the throttle area in terms of structural design, that is: the ratio between the cross-sectional area of the throttle passage 103 and the cross-sectional area of the second nozzle hole 106 is smaller than a preset threshold. Similarly, when the second nozzle hole 106 is injecting, the injection range may be extended to the gap range of the first nozzle hole 105, so that the blending effect may be enhanced.
Optionally, in the structure of the injection device provided in the embodiment of the present invention, the number of the manifold chambers may also be expanded to 3 or more manifold chambers, and a structural design in which 2 or more throttling channels are correspondingly arranged may be provided, and a possible implementation manner may be given below, that is, the number of the second manifold chambers 102 may be multiple, and any two second manifold chambers are communicated through the throttling channel 103. It is understood that the design is that the confluence chambers added to the structure can be regarded as the second confluence chambers while the first confluence chambers 101 connected with the liquid working medium supply system are kept unchanged, but the user should set the number of confluence chambers within a proper number range due to pressure loss and the like.
The injection device provided by the embodiment of the invention can enhance the mixing effect on the premise that the liquid working medium supply system is not changed; through the structural design, the aim of enhancing the mixing effect and mixing area of the liquid fuel and the main flow can be fulfilled by utilizing the characteristic of pressure self-adaptive adjustment in hydrodynamics on the premise of not changing a supply system and increasing additional working media and a complex structural design.
The embodiment of the invention also provides an engine, and the injection device 10 is arranged on the inner wall of the engine.
It is understood that the engine may be any one of a scramjet engine, a rotary detonation engine, etc., and is not limited herein; the engine may have four walls, any one of the walls may be provided with the injection device 10 in the above embodiment, and any two of the opposite walls may be provided with the injection devices, so that a user may set the injection devices according to actual scene requirements, which is not limited herein.
The embodiment of the invention also provides a design method of the injection device, and the injection device can be applied to an engine; the injection device comprises a first confluence cavity, a second confluence cavity and a throttling channel; the throttling channel is used for communicating the first confluence cavity with the second confluence cavity; one side of the first confluence cavity close to the throttling channel is connected with a first spray hole; one side of the second confluence cavity close to the throttling channel is connected with a second spray hole; the method may comprise the steps of:
and S101, acquiring working index parameters and geometric structure parameters of the engine.
In an embodiment of the present invention, the engine index parameter and the geometric parameter may be operating condition parameters of the engine, and may include: the total pressure, the total temperature and the Mach number of the incoming flow gas, the structural size of a flow passage in the engine and a specific structural design mode can be realized, and in the actual design process, the parameters can have preset parameter ranges and various combination modes.
S102, determining the cross-sectional area and the jetting pressure corresponding to the second jet hole and the cross-sectional area and the jetting pressure corresponding to the first jet hole according to the working index parameters and the geometric structure parameters.
S103, determining the cross-sectional area of the throttling channel according to the cross-sectional area and the jetting pressure corresponding to the second jet hole, the cross-sectional area and the jetting pressure corresponding to the first jet hole; the ratio of the cross-sectional area of the throttling channel to the cross-sectional area of the second jet hole is smaller than a preset threshold value; the preset threshold is a positive number less than 1.
In the embodiment of the invention, when the ratio of the cross-sectional areas of the throttling channel and the second nozzle hole is smaller than the preset threshold, the preset threshold may be 0.82The throttling channel can reach a throttling state at the moment, pressure difference exists between the first converging cavity and the second converging cavity at the moment, the jetting pressure of the first converging cavity is larger than that of the second converging cavity, the jetting depth and the atomizing range of the corresponding first jet hole and the second jet hole are different under the state, mutual supplement and expansion of the mixing range of the main flow and the mixing area of the liquid fuel jet and the main flow are achieved, and the effect of enhancing the mixing area of the liquid fuel jet and the main flow is achieved.
Embodiments of the present invention also provide an electronic device comprising one or more processors and a memory for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement the insufflating device design method described above.
An embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the insufflating device design method.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An injection device is arranged on the inner wall of an engine and comprises a first confluence cavity, a second confluence cavity and a throttling channel; the first manifold chamber further comprises a supply passage; the supply channel is used for being connected with a liquid working medium supply system; one side of the first confluence cavity, which is close to the throttling channel, is connected with a first spray hole; one side of the second confluence cavity, which is close to the throttling channel, is connected with a second spray hole; the first spray hole is used for spraying the liquid working medium in the first confluence cavity; the second spray hole is used for spraying the liquid working medium in the second confluence cavity;
the first confluence cavity is used for obtaining the liquid working medium provided by the liquid working medium supply system;
the throttling channel is used for communicating the first confluence cavity with the second confluence cavity and conveying the liquid working medium in the first confluence cavity to the second confluence cavity in a throttling state; the throttling state represents that the ratio of the jetting pressure of the second manifold to the jetting pressure of the first manifold is smaller than a preset threshold; the preset threshold is a positive number smaller than 1; the injection pressure is positively correlated with injection depth.
2. The insufflating device of claim 1, wherein a cross-sectional area of said first orifice and a cross-sectional area of said second orifice are equal; when the ratio of the cross-sectional area of the throttling channel to the cross-sectional area of the second jet hole is smaller than the preset threshold value, the throttling channel is in the throttling state; in the throttling state, the jetting depth of the first jet hole is larger than that of the second jet hole.
3. The injection device according to claim 1 or 2, wherein the number of the first injection holes and the number of the second injection holes are plural, and the number of the first injection holes is the same as the number of the second injection holes; the cross-sectional area of the first jet hole is the sum of the cross-sectional areas of the first jet holes, and the cross-sectional area of the second jet hole is the sum of the cross-sectional areas of the second jet holes.
4. The injector device of claim 3, wherein a plurality of said first orifices are located on the same cross section as a plurality of said second orifices; the plurality of first nozzle holes and the plurality of second nozzle holes are arranged in a staggered mode.
5. The injector device of claim 3, wherein a plurality of said first orifices are located at different cross sections than a plurality of said second orifices; the first jet holes and the second jet holes are arranged oppositely or the first jet holes and the second jet holes are arranged in a staggered mode.
6. The injector of claim 1, wherein said first manifold chamber is proximate an outlet port of said engine; the second confluence cavity is close to an air inlet of the engine.
7. The injector device of claim 2, wherein the first orifice and the second orifice are both circular in cross-section.
8. The insufflating device of claim 1, wherein said second manifold is in a plurality, any two of said second manifolds being in communication with each other through said orifice channel.
9. An engine, characterized in that the injector device according to any of claims 1-8 is arranged in the inner wall of the engine.
10. A design method of an injection device is characterized in that the injection device is arranged on the inner wall of an engine; the injection device comprises a first confluence cavity, a second confluence cavity and a throttling channel; the throttling channel is used for communicating the first confluence cavity and the second confluence cavity; one side of the first confluence cavity, which is close to the throttling channel, is connected with a first spray hole; one side of the second confluence cavity, which is close to the throttling channel, is connected with a second spray hole; the method comprises the following steps:
acquiring a working index parameter and a geometric structure parameter of the engine;
determining a cross-sectional area and an injection pressure corresponding to the second injection hole and a cross-sectional area and an injection pressure corresponding to the first injection hole according to the working index parameter and the geometric structure parameter;
determining the cross-sectional area of the throttling channel according to the cross-sectional area and the jetting pressure corresponding to the second jet hole, the cross-sectional area and the jetting pressure corresponding to the first jet hole; the ratio of the cross-sectional area of the throttling channel to the cross-sectional area of the second jet hole is smaller than a preset threshold value; the preset threshold is a positive number less than 1.
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