CN111894738B - Injection device, engine and injection device design method - Google Patents

Abstract

The present invention provides an injection device, an engine and a design method for the injection device. The injection device is arranged on the inner wall of the engine and includes a first confluence chamber, a second confluence chamber and a throttling channel; The first and second confluence chambers are also respectively connected with first and second nozzle holes for injection; the first confluence chamber is used to obtain the liquid working medium; the throttling channel , which is used to connect the first confluence cavity and the second confluence cavity, and transport the liquid working medium in the first confluence cavity to the second confluence cavity in a throttled state; the throttled state indicates that the injection pressure of the second confluence cavity is different from that of the second confluence cavity. The ratio between the injection pressures of the first confluence chamber is smaller than the preset threshold; the injection pressure is positively correlated with the injection depth. The invention designs a throttling channel without changing the supply system, so that the injection pressures of the two confluence chambers are different, and the injection depths are also different, and the problems of single injection depth and poor mixing effect are improved.

Description

Injection device, engine and injection device design method

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 technique

In the power system to maintain high-speed flight, scramjet and rotary detonation engine are ideal power devices and key technologies for air-breathing hypersonic flight. Both of these engines use liquid fuel for injection. Under hypersonic conditions, the flow velocity of the high-temperature gas in the flow channel also reaches the supersonic state, and the residence time of the airflow in the engine is very short, only on the order of milliseconds. When liquid fuel is used as the working fluid, the processes of atomization, crushing, and mixing with the mainstream of the liquid jet will directly affect the working state and combustion efficiency of the engine.

At present, the injection of liquid fuel is realized by wall injection. However, the wall injection method has problems such as single injection depth and poor spatial mixing effect. Especially when the size of the flow channel is large, the liquid jet cannot cover the mainstream. The larger the blending effect of the area, the combustion efficiency cannot be improved.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an injection device, an engine and a design method for the injection device, which are used to solve the problems of single injection depth and poor spatial mixing effect in the wall injection method.

In order to achieve the above object, technical scheme of the present invention is as follows:

In a first aspect, the present invention provides an injection device, which is arranged on the inner wall of the engine, the injection device includes a first confluence chamber, a second confluence chamber and a throttle channel; the first confluence chamber further includes a supply channel; the The supply channel is used to connect with the liquid working medium supply system; the side of the first confluence chamber close to the throttle channel is connected with a first nozzle hole; the second confluence chamber is connected to the side of the throttle channel There is a second nozzle hole; the first nozzle hole is used to inject the liquid working medium in the first confluence chamber; the second nozzle hole is used to inject the liquid in the second confluence chamber The working medium is injected; the first confluence cavity is used to obtain the liquid working medium provided by the liquid working medium supply system; the throttle channel is used to communicate the first confluence cavity and the second confluence cavity, And in a throttled state, the liquid working medium in the first confluence chamber is transported into the second confluence cavity; the throttled state represents the injection pressure of the second confluence cavity and the injection of the first confluence cavity. The ratio between the pressures is less than a preset threshold; the preset threshold is a positive number less than 1; the injection pressure is positively correlated with the injection depth.

Optionally, the cross-sectional area of the first spray hole and the cross-sectional area of the second spray hole are equal; the cross-sectional area of the throttle channel and the cross-sectional area of the second spray hole are equal. When the ratio is smaller than the preset threshold, the throttle passage is in the throttle state; in the throttle state, the injection depth of the first injection hole is greater than the injection depth of the second injection hole .

Optionally, the number of the first injection holes and the number of the second injection holes are multiple, and the number of the first injection holes is the same as the number of the second injection holes; The cross-sectional area is the sum of the cross-sectional areas of the plurality of first injection holes, and the cross-sectional area of the second injection holes is the sum of the cross-sectional areas of the plurality of second injection holes.

Optionally, the plurality of first spray holes and the plurality of second spray holes are located in the same cross section; the plurality of first spray holes and the plurality of second spray holes are arranged in a staggered manner.

Optionally, a plurality of the first spray holes and a plurality of the second spray holes are located in different cross sections; a plurality of the first spray holes and a plurality of the second spray holes are arranged facing each other or a plurality of the The first spray holes and the plurality of second spray holes are arranged in a staggered manner.

Optionally, the first confluence cavity is close to the engine air outlet; the second confluence cavity is close to the engine air intake.

Optionally, the cross sections of the first spray hole and the second spray hole are both circular.

Optionally, the number of the second confluence cavities is multiple, and any two of the second confluence cavities are communicated through the throttling channel.

In a second aspect, the present invention provides an engine, wherein the injection device according to the first aspect is provided on the inner wall of the engine.

In a third aspect, the present invention provides a design method for an injection device, which is applied to an engine; the injection device includes a first confluence cavity, a second confluence cavity and a throttle channel; the throttle channel, It is used to communicate the first confluence cavity and the second confluence cavity; the side of the first confluence cavity close to the throttling channel is connected with a first nozzle hole; the second confluence cavity is close to the throttling channel. A second injection hole is connected on one side; the method includes: acquiring the working index parameter and geometric structure parameter of the engine; determining the cross-section corresponding to the second injection hole according to the working index parameter and the geometric structure parameter Area and injection pressure and the cross-sectional area and injection pressure corresponding to the first injection hole; according to the cross-sectional area and injection pressure corresponding to the second injection hole and the cross-sectional area corresponding to the first injection hole and the injection pressure determines the cross-sectional area of the throttle passage; the ratio between the cross-sectional area of the throttle passage and the cross-sectional area of the second injection hole is less than the preset threshold; the preset Threshold is a positive number less than 1.

Embodiments of the present invention provide an injection device, an engine, and a design method for the injection device. The injection device is disposed on the inner wall of the engine, and the injection device includes a first confluence cavity, a second confluence cavity, and a throttle passage; the first The confluence cavity further includes a supply channel; the supply channel is used for connecting with the liquid working medium supply system; the first confluence cavity is connected with a first spray hole on the side close to the throttling channel; the second confluence cavity is connected with a side close to the throttling channel the second nozzle hole; the first nozzle hole is used to inject the liquid working medium in the first confluence chamber; the second nozzle hole is used to inject the liquid working medium in the second confluence chamber; the first confluence flow The cavity is used to obtain the liquid working medium provided by the liquid working medium supply system; the throttling channel is used to connect the first confluence cavity and the second confluence cavity, and transport the liquid working medium in the first confluence cavity under the throttling state into the second confluence chamber; the throttling state indicates that the ratio between the injection pressure of the second confluence chamber and the injection pressure of the first confluence chamber is less than a preset threshold; the preset threshold is a positive number less than 1; Injection pressure is positively related to injection depth. Compared with the prior art, in the embodiment of the present invention, under the condition of ensuring that the liquid working medium supply system is not adjusted, a throttling channel is designed between the two confluence chambers in the injection device, so that the Different injection pressures have different injection depths for the liquid, so the injected liquid can be mixed with better effect inside the engine, which can improve the single injection depth and spatial mixing of liquid fuel in the prior art. The effect is not good and so on.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of an injection device according to an embodiment of the present invention;

2 is two cross-sectional views of an injection device according to an embodiment of the present invention;

3 is a schematic diagram of an arrangement of spray holes provided in an embodiment of the present invention;

FIG. 4 is a schematic diagram of another arrangement of nozzle holes provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another arrangement of spray holes according to an embodiment of the present invention.

Icons: 10-injection device; 101-first confluence chamber; 102-second confluence chamber; 103-throttle channel; 1011-supply channel; 105-first nozzle hole; 106-second nozzle hole.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship that the product of the invention is usually placed in use, 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 , so it should not be construed as a limitation of the present invention.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present invention may be combined with each other without conflict.

In high-speed flight power systems, scramjets and rotary detonation engines are ideal power devices and key technologies for air-breathing hypersonic flight, and are widely used in aerospace aircraft, hypersonic aircraft, and hypersonic cruise missiles. The scramjet is an ideal power device and key technology for air-breathing hypersonic flight. When the ramjet works under hypersonic conditions, the flow velocity of the high-temperature gas in the flow channel also reaches the supersonic state, and the residence time of the airflow in the engine is very short. , only on the order of milliseconds. When liquid fuel is used as the working fluid, the processes of atomization, crushing, and mixing with the mainstream of the liquid jet will directly affect the working state and combustion efficiency of the engine. The rotary detonation engine is also one of the new engines with extremely high thermal cycle efficiency. When liquid fuel is used as the working medium, the detonation process is extremely dependent on the mixing level of the liquid working medium and its steam in the engine flow channel.

In the prior art, the injection of liquid fuel is mainly realized by wall injection, but the wall injection method has problems such as single injection depth and poor spatial mixing effect, especially when the size of the flow channel is large, the liquid The jet cannot be mixed with the mainstream to achieve a large coverage area, and the combustion efficiency cannot be improved; when the bubble atomized jet injection is used in this structure, additional gas medium needs to be introduced, and the structure design is more complicated.

In order to solve the above technical problems, the embodiment of the present invention provides an injection device, the core of which is: through the design of the throttling channel and the realization of the area matching between the throttling channel and the injection hole, the effect of mixing is enhanced. Structural design, without changing the supply system, adding additional working fluid and complex structural design, can use the characteristics of pressure adaptive adjustment in fluid mechanics to achieve the purpose of enhancing the mixing effect and mixing area of liquid fuel and mainstream.

In order to facilitate the understanding of the realization principle of the enhanced mixing effect according to the embodiment of the present invention, please refer to FIG. 1 . FIG. 1 is a top view of an injection device according to an embodiment of the present invention, wherein the injection device 10 can be arranged on the engine The inner wall includes a first confluence cavity 101, a second confluence cavity 102 and a throttling channel 103; wherein, the first confluence cavity 101 also includes a supply channel 1011; the supply channel 1011 is used to connect with the liquid working medium supply system to obtain liquid working The liquid working medium provided by the mass supply system, the liquid working medium can be liquid fuel; the first nozzle hole 105 is connected to the side of the first confluence cavity 101 close to the throttle channel 103; the second confluence cavity 102 close to the throttle channel 103 A second nozzle hole 106 is connected to one side; the first nozzle hole 105 is used to inject the liquid working medium in the first confluence chamber 101 ; the second nozzle hole 106 is used to inject the liquid in the second confluence chamber 102 The working fluid is injected.

In order to facilitate the understanding of the structure of the injection device shown in FIG. 1 , two sectional views of the injection device shown in FIG. 1 are also given below. Referring to FIG. 2 , FIG. 2 shows two types of the injection device provided by the embodiment of the present invention. Cutaway view.

The first confluence chamber 101 is used to obtain the liquid working medium provided by the liquid working medium supply system.

The throttling channel 103 is used for connecting the first confluence cavity 101 and the second confluence cavity 102 , and conveys the liquid working medium in the first confluence cavity 101 to the second confluence cavity 102 in a throttling state. The throttling state indicates that the ratio between the injection pressure of the second confluence cavity 102 and the injection pressure of the first confluence cavity 101 is smaller than the preset threshold; the preset threshold is a positive number less than 1; the injection pressure and the injection depth are positive. related.

In the embodiment of the present invention, according to the knowledge of fluid mechanics, when the liquid flows through a section to reach a throttled state, the flow rate passing through the section is only related to the section area and the upstream pressure, but has nothing to do with the downstream pressure. The downstream pressure of the section and the upstream pressure When the ratio is less than a specific value a, the section will reach a throttled state, and the value is related to the upstream and downstream structural parameters of the section. In general, a≈0.8. Therefore, it can be understood that in the embodiment of the present invention, due to the first A confluence cavity 101 is connected to the liquid working medium supply system, so the first confluence cavity 101 can be regarded as the upstream of the fluid, and the second confluence cavity 102 can be regarded as the downstream of the fluid. When the flow passage 103 flows to the second confluence chamber 102, when the ratio of the downstream pressure to the upstream pressure of the cross section of the throttling passage 103 is less than a certain value, the flow rate of the throttling passage 103 can reach the throttling state, which can also be understood as the second When the ratio between the injection pressure of the confluence chamber 102 and the injection pressure of the first confluence chamber 101 is less than a preset threshold, the flow rate of the throttle passage 103 can reach a throttled state, and the preset threshold can be 0.8. The pressure is positively related to the injection depth. Therefore, when the ratio between the injection pressure of the second manifold 102 and the injection pressure of the first manifold 101 is less than the preset threshold, the injection depth of the second manifold 102 is less than The injection depth of the first confluence cavity 101, because the injection depths of the two confluence cavities are different, the injected liquid can be mixed with better effect inside the engine, so that the injection of the liquid fuel in the prior art can be improved. Note that the depth is single and the spatial mixing effect is not good.

An injection device provided by an embodiment of the present invention is provided on the inner wall of the engine, and the injection device includes a first confluence cavity, a second confluence cavity and a throttle channel; the first confluence cavity further includes a supply channel; the supply channel is used for connecting with The liquid working medium supply system is connected; the side of the first confluence cavity close to the throttling channel is connected with a first spray hole; the side of the second confluence cavity close to the throttle channel is connected with a second spray hole; the first spray hole is used for The liquid working medium in the first confluence cavity is injected; the second nozzle hole is used for injecting the liquid working medium in the second confluence cavity; the first confluence cavity is used to obtain the liquid working medium provided by the liquid working medium supply system. liquid working medium; throttling channel, used to connect the first confluence cavity and the second confluence cavity, and transport the liquid working medium in the first confluence cavity to the second confluence cavity in the throttling state; the throttling state represents the first The ratio between the injection pressure of the second confluence cavity and the injection pressure of the first confluence cavity is smaller than the preset threshold; the injection pressure is positively correlated with the injection depth. Compared with the prior art, in the embodiment of the present invention, under the condition of ensuring that the liquid working medium supply system is not adjusted, only the throttling channel is designed, so that the injection pressures of the two confluence chambers are different, and the injection depth of the liquid is reduced. Therefore, the injected liquid can be mixed with better effect inside the engine, which can improve the problems of single injection depth of liquid fuel and poor spatial mixing effect in the prior art.

Optionally, in the supersonic gas flow, due to the phenomenon that the liquid jet and the supersonic incoming flow interfere with each other, the bow shock wave will affect the mixing effect. The corresponding injection pressure is relatively small, and the injection pressure corresponding to the injection hole set at the downstream position of the incoming gas (the direction in which the gas leaves) is relatively large. leaving direction), the second confluence chamber 102 is close to the engine air inlet (the gas entering direction), so that the injection pressure of the first confluence chamber 101 can be further ensured to be greater than the injection pressure of the second confluence chamber 102 .

Optionally, the first confluence cavity 101 and the second confluence cavity in the embodiment of the present invention are also respectively connected with spray holes, and the spray holes can realize the spraying of the liquid working medium inside the confluence cavity. Therefore, the cross-sectional area of the throttling channel needs to match the cross-sectional area of the nozzle hole of the second confluence cavity, so that the flow of the throttling channel can reach the throttling state, and at the same time, the injection pressure of the first confluence cavity 101 can be greater than that of the first confluence cavity 101. The injection pressure of the two confluence chambers 102, so a possible implementation is given below, namely:

The cross-sectional area of the first nozzle hole 105 is equal to the cross-sectional area of the second nozzle hole 106 ; when the ratio between the cross-sectional area of the throttle channel 103 and the cross-sectional area of the second nozzle hole 106 is smaller than the preset threshold, the throttle The flow channel is in a throttled state; in the throttled state, the injection depth of the first injection hole 105 is greater than the injection depth of the second injection hole 106 .

In the embodiment of the present invention, according to the knowledge of fluid mechanics, the flow rate corresponding to the throttling state when the liquid flows through a section can be obtained according to the relational formula (1):

表征流量，μ表征流通系数，在实际的应用场景中可以通过多次试验确定；A表征液体流经的截面的最小流通面积；ρ表征流体密度；P表征最小截面上游对应的压力；P_v表征液体的饱和蒸汽压，常温状态下一般为几至几十千帕，相比液体喷注压力可以忽略。in

Represents the flow rate, μ represents the flow coefficient, which can be determined by multiple experiments in practical application scenarios; A represents the minimum flow area of the cross-section through which the liquid flows; ρ represents the fluid density; P represents the corresponding pressure upstream of the minimum cross-section; P _v represents The saturated vapor pressure of the liquid is generally several to tens of kilopascals at room temperature, which can be ignored compared to the 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 101 is A _A , the total area of the second nozzle holes 106 connected to the second manifold 102 is _AB , and the throttle channel 103 The area of is A _t , where A _A = A _B ; by realizing the area matching between A _t and A _B , the flow of the throttling channel 103 can reach a throttling state. At this time, the first confluence chamber 101, The flow rates of the second confluence chamber 102 and the throttling channel 103 can be obtained according to the relational formula (1), which are the relational formulae (2), (3), and (4), respectively:

为第一汇流腔101的流量，

为第二汇流腔102的流量，

为节流通道的流量，由于此时节流通道的流量达到节流状态时，流经节流通道的最大流量即为流进第二汇流腔102的流量，所以

in,

is the flow rate of the first confluence chamber 101,

is the flow rate of the second confluence chamber 102,

is the flow rate of the throttling passage. Since the flow rate of the throttling passage reaches the throttling state at this time, the maximum flow rate flowing through the throttling passage is the flow rate flowing into the second confluence chamber 102, so

a＝0.8此时节流通道103达到节流状态，且P_A＝P_t，由此可以得到第一汇流腔101和第二汇流腔102的压力之间的关系如关系式(5)所示：According to the above relations (2), (3), (4), when A _t <a ² *A _B ,

a=0.8 At this time, the throttling channel 103 reaches the throttling state, and P _A =P _t , so the relationship between the pressures of the first confluence cavity 101 and the second confluence cavity 102 can be obtained as shown in the relational formula (5):

According to the relational formula (5), when A _t <A _B =A _A , P _A >P _B can be achieved, that is, the injection pressure of the nozzles connected to the first confluence chamber 101 is greater than that of the nozzles connected to the second confluence chamber 102 In this state, the injection depth and atomization range of the corresponding nozzle holes will be different, and the mixing range of the mainstream and the mainstream will be complemented and expanded to achieve the effect of enhancing the mixing area of the liquid fuel jet and the mainstream. .

Optionally, referring to FIG. 1 , it can be seen that the number of the first injection holes 105 and the number of the second injection holes 106 are multiple, and the number of the first injection holes 105 is the same as the number of the second injection holes 106 ; The cross-sectional area is the sum of the cross-sectional areas of the plurality of first injection holes 105 , and the cross-sectional area of the second injection holes 106 is the sum of the cross-sectional areas of the plurality of second injection holes 106 .

Optionally, the cross-sections of the first spray hole 105 and the second spray hole 106 in the above embodiment are both circular.

Optionally, in order to ensure the mixing effect, the above-mentioned arrangement of the first nozzle holes and the second nozzle holes can also be in various ways. For the convenience of understanding, please refer to FIG. 3 , which is an embodiment of the present invention. Schematic diagram of the arrangement of nozzle holes. The plurality of first orifices 105 and the plurality of second orifices 106 may be located in the same gas flow direction cross section, and the first orifices 105 and the second orifices 106 may be staggered.

In the embodiment of the present invention, since the positions of the first injection hole 105 and the second injection hole 106 are in the same gas flow direction cross-section, it is only necessary to ensure that the injection states are different, that is, as long as P _A ≠ P _B , two groups can be realized The injection pressure of the nozzle holes is different, and the corresponding injection depth and atomization range are different, so as to achieve the effect of enhancing the mixing of the fuel jet and the mainstream.

Optionally, in order to ensure the mixing effect, the above-mentioned arrangement of the first orifice and the second orifice may also be as shown in FIG. 4 , which is a schematic diagram of another arrangement of the orifice provided by the embodiment of the present invention . The plurality of first orifices 105 and the plurality of second orifices 106 may be located in different gas flow cross sections, and the first orifices 105 and the second orifices 106 may be arranged in a staggered manner.

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 are performing injection, the injection range can be extended to the second nozzle holes 106 within the clearance range.

Optionally, in order to ensure the mixing effect, the above-mentioned arrangement of the first orifice and the second orifice may also be as shown in FIG. 5 , which is a schematic diagram of another arrangement of the orifice provided by the embodiment of the present invention . The plurality of first orifices 105 and the plurality of second orifices 106 may be located in different gas flow cross sections, and the first orifices 105 and the second orifices 106 may be arranged facing each other.

In the embodiment of the present invention, in order to ensure the mixing effect, the distance between the cross-sections of the first spray hole 105 and the second spray hole 106 can also be set according to the actual situation, so as to achieve the effect of partitioned atomization and enhanced mixing.

It should be noted that, for arrangement 2 and arrangement 3, the first orifice 105 and the second orifice 106 are on different cross-sections of the gas flow direction, and it is only necessary to ensure that the pressure of the second orifice 106 is lower than the pressure of the first orifice 105 , in the structural design, it is necessary to ensure that the nozzle hole area and the throttle area match, that is, the ratio between the cross-sectional area of the throttle channel 103 and the cross-sectional area of the second nozzle hole 106 is smaller than the preset threshold. Similarly, when the second injection hole 106 is performing injection, the injection range can be extended to the range of the gap of the first injection hole 105, so that the mixing effect can be enhanced.

Optionally, in the structure of the injection device provided by the embodiment of the present invention, the number of confluence chambers can also be expanded to three or more confluence chambers, corresponding to the structural design of two or more throttling channels, the following can be given. A possible implementation manner is provided, that is, the number of the second confluence cavities 102 may be multiple, and any two second confluence cavities are communicated through the throttle passage 103 . It can be understood that, in this design, under the condition that the first confluence cavity 101 connected to the liquid working medium supply system is kept unchanged, the confluence cavity added to the structure can be regarded as the second confluence cavity, but due to the pressure For reasons such as loss, the user should set the number of manifolds within an appropriate range.

The injection device provided by the embodiment of the present invention can enhance the mixing effect without changing the liquid working medium supply system; through this structural design, the supply system can be changed without changing the premise of adding additional working medium and complex structure design. Under this method, the characteristics of pressure adaptive adjustment in fluid mechanics are used to achieve the purpose of enhancing the mixing effect and mixing area of liquid fuel and mainstream.

The embodiment of the present invention also provides an engine, and an injection device 10 is provided on the inner wall of the engine.

It can be understood that the above-mentioned engine can be any ramjet engine such as a scramjet engine, a rotary detonation engine, etc., which is not limited here; the above-mentioned engine can have four walls, and any of the above-mentioned walls can be set In the injection device 10 in the embodiment, the above-mentioned injection device may also be installed in any two opposite wall surfaces, and the user can set it according to the actual scene requirements, which is not limited here.

An embodiment of the present invention further provides a design method for an injection device, which can be applied to an engine; the injection device includes a first confluence cavity, a second confluence cavity and a throttle channel; the throttle channel is used to communicate with the first A confluence cavity and a second confluence cavity; the first confluence cavity is connected with a first spray hole on the side close to the throttle channel; the second confluence cavity is connected with a second spray hole on the side close to the throttle channel; the method may include the following steps: steps:

S101. Acquire working index parameters and geometric structure parameters of the engine.

In the embodiment of the present invention, the above-mentioned engine index parameters and geometric structure parameters may be the working condition parameters of the engine, which may include: the total pressure, total temperature, and Mach number of the incoming gas, the structural size and specific structural design of the flow channel in the engine. In the actual design process, these parameters can have preset parameter ranges and various combinations.

S102. Determine the cross-sectional area and the injection pressure corresponding to the second injection hole and the cross-sectional area and injection pressure corresponding to the first injection hole according to the work index parameter and the geometric structure parameter.

S103: Determine the cross-sectional area of the throttle channel according to the cross-sectional area corresponding to the second nozzle hole and the injection pressure and the cross-sectional area corresponding to the first nozzle hole and the injection pressure; The ratio between the cross-sectional areas of the holes is less than a preset threshold; the preset threshold is a positive number less than 1.

In the embodiment of the present invention, when the ratio between the cross-sectional area of the throttle channel and the cross-sectional area of the second nozzle hole is smaller than the preset threshold, the preset threshold may be 0.8 ² =0.64, and the throttle channel can reach the throttle flow state, at this time there is a pressure difference between the first confluence cavity and the second confluence cavity, and the injection pressure of the first confluence cavity is greater than the injection pressure of the second confluence cavity. The injection depth and atomization range of the injection hole and the second injection hole are different, and the mixing range of the main stream and the main stream are complemented and enlarged, so as to achieve the effect of enhancing the mixing area of the liquid fuel jet and the main stream.

An embodiment of the present invention further provides an electronic device, the electronic device includes one or more processors and a memory, where the memory is used to store one or more programs, when the one or more programs are executed by the one or more processors, One or more processors are caused to implement the above-described injection device design method.

An embodiment of the present invention further provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned method for designing an injection device is implemented.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be connected in one piece; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (9)

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 the injection depth; a cross-sectional area of the first nozzle hole and a cross-sectional area of the second nozzle hole 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.

2. The injector of claim 1, wherein the number of said first orifices and the number of said second orifices are plural, the number of said first orifices being the same as the number of said second orifices; 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.

3. The injector device of claim 2, 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.

4. The injector device of claim 2, 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.

5. 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.

6. The injector device of claim 5, wherein the first orifice and the second orifice are both circular in cross-section.

7. 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.

8. An engine, characterized in that the injector device according to any of claims 1-7 is arranged in the inner wall of the engine.

9. 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; a cross-sectional area of the first nozzle hole and a cross-sectional area of the second nozzle hole 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 a preset threshold value, the throttling channel is in a throttling state; in the throttling state, the jetting depth of the first jet hole is larger than that of the second jet 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.

Images