A direct current self-hammering mutual-approaching type injector and a design method of injection holes thereof

Abstract

The present application relates to a kind of two-component attitude control thrust chamber device and design method, specifically relates to a kind of direct current self-hitting mutual leaning type injector and its injection hole design method, solve the technical problem that existing direct current mutual hitting type injector is difficult to realize the reliable cooling of thrust chamber wall under the premise of ensuring high combustion performance, especially in the case where mutual hitting exists certain machining deviation to machining precision, the dispersion of attitude control thrust chamber wall temperature is also larger, affect its reliable work.The direct current self-hitting mutual leaning type injector is composed of injection cylinder and injection face, and oxidant liquid collecting cavity and fuel liquid collecting cavity are sequentially arranged on the injection cylinder from the center along the radial direction;It also includes a plurality of injection holes arranged radially on the injection face;Injection hole includes a plurality of oxidant holes sequentially arranged from inside to outside and corresponding to oxidant liquid collecting cavity, and a plurality of fuel holes and a plurality of cooling holes corresponding to fuel liquid collecting cavity;A plurality of oxidant holes form a plurality of oxidant self-hitting pairs;A plurality of fuel holes form a plurality of fuel self-hitting pairs.

Description

Technical Field

[0001] This invention relates to a dual-element attitude control thrust chamber device and its design method, specifically to a DC self-impacting interlocking injector and its injection hole design method. Background Technology

[0002] The dual-element attitude and orbit control thrust chamber boasts advantages such as flexible operation, high performance, and lightweight structure, making it widely used in launch vehicles, missile weapons, and space propulsion. The injector within the attitude and orbit control thrust chamber functions to perform propellant injection and flow distribution, propellant atomization, and coolant injection. This is essential for achieving a relatively uniform flow intensity mixing ratio distribution and finer propellant atomization particle size, thereby enabling efficient propellant combustion and obtaining high specific impulse performance.

[0003] DC mutual impact injectors have become one of the most commonly used injectors for dual-element attitude control thrust chambers due to their advantages such as simple and reliable structure and mature technology. DC-DC interlocking injectors typically employ an interlocking method with the oxidizer at the center and the fuel on the outside. A fuel liquid film is installed in the outer region to cool the thrust chamber wall. Therefore, in this structural configuration where the oxidizer momentum and orifice size of the interlocking pairs are greater than those of the fuel, the diversification of thrust levels leads to significant differences in propellant flow intensity and mixing ratio distribution within the combustion chamber. The increasing pressure within the combustion chamber due to the demand for lightweight and miniaturized thrust chambers results in a significant increase in heat flux density. Furthermore, the increased cooling requirements for the thrust chamber wall due to the thermal insulation of the outer wall further limit the application range of DC-DC interlocking injectors. Under these adverse conditions, achieving reliable cooling of the thrust chamber wall while maintaining high combustion performance is challenging, especially when there are certain machining deviations in the interlocking pairs. This leads to significant temperature dispersion on the thrust chamber wall, negatively impacting its reliable operation. Summary of the Invention

[0004] The purpose of this invention is to address the technical problem that existing DC mutual-impact injectors, while ensuring high combustion performance, struggle to reliably cool the thrust chamber wall, especially when there are certain machining deviations in the mutual-impact coupling, resulting in significant temperature variations on the thrust chamber wall and affecting its reliable operation. This invention provides a DC self-impact mutual-impact injector and its injection hole design method to solve the problem of maintaining high combustion performance and achieving cooling in existing DC mutual-impact injectors under adverse conditions such as diverse thrust levels, high chamber pressure, and the thermal insulation environment of the combustion chamber exterior wall.

[0005] The concept of this invention is:

[0006] This invention employs a layout where the oxidizer self-impacts at the center, the fuel self-impacts on the outside, and the coolant is sprayed in the edge area. First, the self-impact of the oxidizer and fuel atomizes the propellant, forming a self-impacting fog fan. Then, the oxidizer and fuel self-impacting fog fans approach each other in space and intersect, achieving secondary atomization through mutual impact and contact (referred to as mutual contact). This mutual contact process enhances the mixing of the oxidizer and fuel. This combination of self-impact followed by mutual contact achieves excellent propellant atomization and mixing, creating favorable conditions for high combustion efficiency in the thrust chamber. The wider fog fan deployment after the fuel self-impact blocks the central oxidizer self-impacting fog fan, reducing the amount of central oxidizer penetrating outwards. This reduces the impact of oxidizer penetration on the low-mixture atmosphere in the edge area, thereby improving the cooling and protection effect of the coolant film on the walls.

[0007] To solve the above-mentioned technical problems and realize the above-mentioned inventive concept, the technical solution adopted by the present invention is as follows:

[0008] A DC self-operated interlocking injector consists of an injection cylinder and an injection surface. The injection cylinder has an oxidizer collection chamber and a fuel collection chamber arranged sequentially from the inside out. Its special feature is that:

[0009] It also includes multiple injection holes set on the injection surface;

[0010] The injection holes include multiple oxidant holes arranged sequentially from the inside out and corresponding to the oxidant collection chamber, as well as multiple fuel holes and multiple cooling holes corresponding to the fuel collection chamber;

[0011] The plurality of oxidant pores form a plurality of oxidant self-hitting pairs;

[0012] The multiple fuel holes form multiple fuel self-punch pairs.

[0013] Furthermore, the oxidant self-attachment pair includes an inner layer oxidant self-attachment pair and an outer layer oxidant self-attachment pair, which are uniformly arranged along different circumferences.

[0014] Furthermore, the inner layer oxidant self-impact pair includes any one first oxidant axial hole and a corresponding first oxidant external oblique hole disposed on the same radius of the injection surface;

[0015] The outer oxidant self-impact pair includes any one second oxidant axial hole and its corresponding second oxidant external oblique hole set on the same radius of the injection surface;

[0016] The diameter D1 of the circle containing the first axial hole of the oxidant is smaller than the diameter D2 of the circle containing the second axial hole of the oxidant.

[0017] The inner oxidant self-impacts the ejected oxidant to form an inner oxidant self-impact fog fan after they collide with each other.

[0018] The outer oxidant self-impacts with each other to form an outer oxidant self-impact fog fan.

[0019] Furthermore, the fuel self-impact pair includes any one inner inclined fuel hole and its corresponding outer inclined fuel hole arranged on the same radius of the injection surface;

[0020] The outlet end of the internal inclined hole of the fuel faces the direction of oxidant emission;

[0021] The outlet end of the fuel external oblique hole faces the edge of the injection cylinder;

[0022] The fuel ejected along the outer and inner inclined fuel holes impacts to form a fuel self-ignition mist fan.

[0023] Furthermore, the resultant momentum angle formed by the inner layer oxidant self-attacking mist fan along the self-attacking momentum synthesis direction and the central axis of the injection cylinder is... The value range is 30° to 60°;

[0024] The angle of resultant momentum formed between the outer oxidant self-ignition mist fan along the self-ignition momentum synthesis direction and the central axis of the injection cylinder. The value range is 30° to 60°;

[0025] The resultant momentum angle formed between the fuel self-ignition mist fan along the direction of self-ignition momentum synthesis and the central axis of the injection cylinder The value range is 0° to 45°;

[0026] The first mutual-impact fog fan formed by the inner oxidant self-impact fog fan and the fuel self-impact fog fan after they come into contact with each other has a mutual-impact momentum angle β1 formed along the mutual-impact momentum synthesis direction and the central axis of the injection cylinder, which ranges from 0° to 45°.

[0027] The second mutual-impact fog fan, formed by the outer oxidizer self-impact fog fan and the fuel self-impact fog fan coming into contact with each other, has a mutual-impact momentum angle β2 formed along the mutual-impact momentum synthesis direction and the central axis of the injection cylinder, ranging from 0° to 45°.

[0028] Furthermore, the number of self-punch pairs of the inner oxidant is the same as that of the outer oxidant;

[0029] The first and second oxidant external oblique holes are uniformly staggered.

[0030] Meanwhile, the present invention also provides a method for designing the injection orifice of the above-mentioned DC self-impacting interlocking injector, characterized by comprising the following steps:

[0031] 1) Calculate the total flow rate of the injector based on its thrust and specific impulse;

[0032] 2) Calculate the total flow rate of oxidizer and total flow rate of fuel based on the total flow rate of the injector and the mixing ratio, and calculate the total flow rate of coolant based on the coolant percentage;

[0033] 3) Calculate the orifice diameter of the oxidant based on the injection pressure drop and total flow rate;

[0034] 4) Calculate the orifice diameter of the fuel injection hole based on the fuel injection pressure drop and total flow rate;

[0035] 5) Calculate the diameter of the cooling holes based on the injection pressure drop and total flow rate of the coolant;

[0036] 6) Calculate the synthesis momentum angle and synthesis velocity of the oxidant self-impact pair and the synthesis momentum angle and synthesis velocity of the fuel self-impact pair, and complete the injection orifice design of the injector.

[0037] Furthermore, it also includes step 7):

[0038] Calculate the combined momentum angle and combined velocity of the oxidant self-impact pair and the fuel self-impact pair after they come into contact with each other.

[0039] Further, step 1) specifically involves: based on the thrust of the injector... He Bi Chong The total flow rate of the injector is calculated using the following formula. :

[0040] ;

[0041] Step 2) specifically involves:

[0042] 2.1. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total flow rate of the oxidant is calculated using the following formula. :

[0043] ;

[0044] 2.2. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total fuel flow rate is calculated using the following formula. :

[0045]

[0046] In the formula: This represents the coolant percentage.

[0047] 2.3 Calculate the total coolant flow rate based on the coolant percentage. :

[0048] ;

[0049] Step 3) specifically involves:

[0050] Based on the injection pressure drop of the oxidant and the total flow rate The pore size of the oxidant pores can be calculated using the following formula:

[0051]

[0052]

[0053]

[0054] In the formula: The self-impact flow rate of a single inner-layer oxidant is expressed in kg / s.

[0055] The flow rate of a single outer oxidant self-impact pair is expressed in kg / s.

[0056] The number of self-hit pairs of the inner oxidant or the outer oxidant is a dimensionless parameter.

[0057] Let be the flow coefficient of the oxidant, and be a dimensionless parameter;

[0058] The density of the oxidant is expressed in kg / m³. 3 ;

[0059] The injection pressure drop of the oxidant is expressed in Pa.

[0060] The inner diameter of the first oxidant external inclined hole is in meters.

[0061] The inner diameter of the axial hole for the first oxidant is in meters.

[0062] The inner diameter of the inclined hole in the second oxidant is in meters.

[0063] The inner diameter of the axial hole for the second oxidant is in meters.

[0064] Step 4) specifically involves:

[0065] The orifice diameter of the fuel injection hole is calculated using the following formula, based on the fuel injection pressure drop and total flow rate:

[0066]

[0067] In the formula: This represents the total flow rate of fuel, expressed in kg / s.

[0068] Let be the fuel flow coefficient, and be a dimensionless parameter.

[0069] This refers to the density of the fuel, expressed in kg / m³. 3 ;

[0070] This represents the fuel injection pressure drop, measured in Pa.

[0071] This is the inner diameter of the fuel outer inclined hole, in meters;

[0072] The inner diameter of the inclined fuel inlet is in meters (m).

[0073] Step 5) specifically involves:

[0074] Based on the injection pressure drop of the coolant and the total flow rate The diameter of the cooling hole can be calculated using the following formula:

[0075]

[0076] In the formula: The inner diameter of the cooling hole is in meters (m).

[0077] Step 6) specifically involves:

[0078] 6.1 Calculate the combined momentum angle of the inner oxidant self-hit pair using the following formula. and synthesis speed :

[0079]

[0080]

[0081] In the formula: The momentum angle of the self-impact pair of the inner oxidant is expressed in degrees.

[0082] The self-impact rate of the inner oxidant is expressed in m / s.

[0083] The angle between the injection direction of the first oxidant through the external oblique orifice and the axis of the injector;

[0084] The angle between the axial injection direction of the first oxidant and the axis of the injector;

[0085] 6.2 Calculate the combined momentum angle of the outer oxidant self-hit pair using the following formula. and synthesis speed :

[0086]

[0087]

[0088] In the formula: The momentum angle of the self-impact pair of the outer oxidant is expressed in degrees.

[0089] The value represents the self-impact rate of the outer oxidant, expressed in m / s.

[0090] The angle between the injection direction of the second oxidant through the external oblique orifice and the axis of the injector;

[0091] The angle between the axial injection direction of the second oxidant and the axis of the injector;

[0092] 6.3 Calculate the resultant momentum angle of the fuel self-impact pair using the following formula. and synthesis speed :

[0093]

[0094]

[0095] In the formula: The angle of momentum of the fuel self-impact pair is expressed in degrees.

[0096] The fuel self-impact synthesis rate is expressed in m / s.

[0097] The angle between the fuel injection direction from the external inclined hole and the injector axis;

[0098] The angle between the fuel injection direction through the internal inclined hole and the injector axis;

[0099] Further, step 7) specifically involves:

[0100] 7.1 Calculate the combined momentum angle and combined velocity of the inner oxidizer self-impact pair and the fuel self-impact pair after they come into contact with each other using the following formula:

[0101]

[0102]

[0103] In the formula:

[0104] The angle of momentum formed by the self-impact of the inner oxidizer and the self-impact of the fuel after they come into contact with each other, in degrees;

[0105] The rate of synthesis after the inner oxidant self-impact pair and the fuel self-impact pair come into contact with each other is expressed in m / s.

[0106] 7.2 Calculate the combined momentum angle and combined velocity of the outer oxidizer self-impact pair and the fuel self-impact pair after they come into contact with each other using the following formula:

[0107]

[0108]

[0109] In the formula:

[0110] The momentum angle is the resultant momentum angle after the outer oxidizer self-impact pair and the fuel self-impact pair come into contact with each other, and the unit is °;

[0111] The rate of reaction between the outer oxidant self-impact pair and the fuel self-impact pair after they come into contact with each other is expressed in m / s.

[0112] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0113] 1) In this invention, the DC self-impacting interlocking injector consists of two oxidizer holes with different injection directions, distributed at the injection center in a multi-ring, staggered arrangement; and a fuel self-impacting pair consists of two fuel holes with different injection directions, distributed on the outer side of the injector in a multi-ring arrangement. Cooling holes are located at the edge of the injector, arranged on the same radius as the oxidizer and fuel self-impacting pairs. Individual oxidizer and fuel self-impacting pairs are distributed along the same radial line of the injector. Multiple injection holes are arranged in a ring on the injection surface according to the injector's thrust level and injection pressure drop requirements. This allows for a secondary atomization of the propellant through a self-impacting and interlocking atomization mixing method, achieving better mixed gas quality and better initial combustion performance compared to existing technologies.

[0114] 2) The DC self-attacking interlocking injector of this invention employs a self-attacking followed by interlocking atomization mixing method: First, the oxidizer self-attacking pair formed by the four oxidizer holes achieves primary atomization of the oxidizer, forming an oxidizer self-attacking mist fan. The fuel self-attacking pair formed by the two fuel holes achieves primary atomization of the fuel, forming a fuel self-attacking mist fan. Subsequently, the oxidizer self-attacking mist fan and the fuel self-attacking mist fan approach each other spatially to achieve interlocking, promoting secondary atomization of the two propellant components and enhancing their mixing. The wider mist fan width after the outer fuel self-attacking blocks the central oxidizer self-attacking mist fan, reducing the amount of central oxidizer penetrating outwards. This reduces the impact of oxidizer penetration on the low-mix-ratio atmosphere in the edge region, reduces the consumption of the near-wall liquid film in the central combustion zone of the combustion chamber, maintains a low-mix-ratio atmosphere in the near-wall region, and improves the cooling and protection effect of the coolant film on the wall surface. This self-impacting injection method solves the problem of cooling difficulties in maintaining high combustion performance under adverse factors such as diverse thrust levels, high chamber pressure conditions, and the heat insulation environment of the outer wall of the combustion chamber in existing DC mutual-impact injectors.

[0115] 3) In addition to using an outer fuel self-attacking mist fan for shielding, the DC self-attacking injector of the present invention employs a design with different aperture sizes for the oxidizer self-attacking pair to further control the amount of central oxidizer penetrating into the edge region. Compared with the existing DC self-attacking injectors, the DC self-attacking injector of the present invention reduces the adverse effects of central oxidizer penetration on the fuel liquid film near the wall region through a two-layer shielding scheme. Especially when there is a certain machining deviation in the machining accuracy of the injection pair, the temperature dispersion of the attitude and orbit control thrust chamber wall is smaller. Attached Figure Description

[0116] Figure 1 This is a schematic diagram of the injection surface structure in an embodiment of the DC self-impacting interlocking injector of the present invention;

[0117] Figure 2 This is a cross-sectional view of the injection surface along AA in an embodiment of the DC self-impacting interlocking injector of the present invention;

[0118] Figure 3 for Figure 2 A schematic diagram illustrating the principle of mutual contact between the oxidizer self-attachment pair and the fuel self-attachment pair.

[0119] The attached figures are labeled as follows:

[0120] 1-Oxidant collection chamber, 11-First oxidant external inclined hole, 12-First oxidant axial hole, 13-Second oxidant external inclined hole, 14-Second oxidant axial hole, 2-Fuel collection chamber, 21-Fuel external inclined hole, 22-Fuel internal inclined hole, 3-Cooling hole. Detailed Implementation

[0121] like Figure 1As shown, a DC self-attacking interlocking injector consists of an injection cylinder and an injection surface. The injection cylinder has an oxidizer collection chamber 1 and a fuel collection chamber 2 arranged radially from the center. It also includes a plurality of injection holes arranged radially on the injection surface. The injection holes include a plurality of oxidizer holes arranged from the inside to the outside and corresponding to the oxidizer collection chamber 1, a plurality of fuel holes corresponding to the fuel collection chamber 2, and a plurality of cooling holes 3. The plurality of oxidizer holes form a plurality of oxidizer self-attacking pairs. The plurality of fuel holes form a plurality of fuel self-attacking pairs.

[0122] like Figure 2 As shown, the oxidant self-impact pair includes an inner layer oxidant self-impact pair and an outer layer oxidant self-impact pair uniformly arranged along different circumferences. The inner layer oxidant self-impact pair includes any first oxidant axial hole 12 and a corresponding first oxidant external oblique hole 11 arranged on the same radius of the injection surface; the outer layer oxidant self-impact pair includes any second oxidant axial hole 14 and a corresponding second oxidant external oblique hole 13 arranged on the same radius of the injection surface; the diameter D1 of the circle containing the first oxidant axial hole 12 is smaller than the diameter D2 of the circle containing the second oxidant axial hole 14; the oxidant ejected along the inner layer oxidant self-impact pair forms an inner layer oxidant self-impact mist fan after impact; the oxidant ejected along the outer layer oxidant self-impact pair forms an outer layer oxidant self-impact mist fan after impact. The fuel self-impact pair includes any one inner fuel inclination hole 22 and its corresponding outer fuel inclination hole 21 set on the same radius of the injection surface; the outlet end of the inner fuel inclination hole 22 faces the oxidizer ejection direction; the outlet end of the outer fuel inclination hole 21 faces the edge of the injection cylinder; the fuel ejected along the outer fuel inclination hole 21 and the inner fuel inclination hole 22 collides to form a fuel self-impact mist fan.

[0123] The angle of resultant momentum formed between the inner oxidizer self-attacking mist fan along the direction of self-attacking momentum synthesis and the central axis of the injection cylinder. The value range is 30° to 60°; the resultant momentum angle formed by the outer oxidant self-attacking mist fan along the self-attacking momentum synthesis direction and the central axis of the injection cylinder. The value range is 30° to 60°; the resultant momentum angle formed by the fuel self-impacting mist fan along the direction of self-impacting momentum synthesis and the central axis of the injection cylinder. The value range is 0° to 45°.

[0124] The first mutual-impact fog fan, formed by the mutual impact of the inner oxidizer self-impact fog fan and the fuel self-impact fog fan, has a combined momentum angle β1 along the direction of momentum synthesis with the central axis of the injection cylinder, ranging from 0° to 45°. The second mutual-impact fog fan, formed by the mutual impact of the outer oxidizer self-impact fog fan and the fuel self-impact fog fan, has a combined momentum angle β2 along the direction of momentum synthesis with the central axis of the injection cylinder, ranging from 0° to 45°. The number of inner and outer oxidizer self-impact pairs is the same; the first oxidizer outer oblique holes 11 and the second oxidizer outer oblique holes 13 are uniformly staggered.

[0125] The working principle of the DC self-impacting interlocking injector of this invention is as follows:

[0126] like Figure 3 As shown, the oxidant is ejected from the first oxidant axial direction, the first oxidant outer inclined hole 11, the second oxidant axial direction, and the second oxidant outer inclined hole 13, and is ejected at the inner layer oxidant self-impact point S. o1 and the self-hitting point S of the outer oxidant o2 After self-ignition, an inner oxidizer self-ignition fog fan and an outer oxidizer self-ignition fog fan are generated. At the same time, fuel is ejected from the outer inclined fuel hole 21 and the inner inclined fuel hole 22, and at the fuel self-ignition point S... f The self-ignition process generates a fuel-driven fog fan. The oxidizer-driven fog fan operates along the direction of momentum synthesis with an angle of momentum synthesis. and Moving towards the edge of the injection cylinder, the fuel self-impact mist fan moves along the direction of self-impact momentum composition with a resultant momentum angle. Moving towards the axis of the injection cylinder, the oxidizer self-igniting mist fan and the fuel self-igniting mist fan approach each other spatially, and after colliding at points S1 and S2, secondary atomization occurs. The radial component velocity of the two self-igniting mist fans (i.e., the component of their respective composite velocities along the injector radius, with the fuel radial component velocity being...) The radial components of the self-hitting velocities of the inner oxidant pair and the outer oxidant pair are respectively and Under the relative motion of the oxidizer and fuel, the mixing of the oxidizer and fuel is enhanced, creating good mixing conditions for obtaining higher combustion performance.

[0127] This invention relates to a DC self-attacking interlocking injector, employing a layout where the oxidizer self-attaches at the center, the fuel self-attaches on the outer side, and the coolant is injected in the edge area. Each injection orifice consists of one oxidizer self-attaching pair and one fuel self-attaching pair radially from the injector. Each oxidizer self-attaching pair comprises two oxidizer holes with different injection directions, distributed at the center of the injector in a two-ring, uniformly staggered arrangement. Each fuel self-attaching pair consists of two fuel holes with different injection directions, distributed on the outer side of the injector in a single-ring arrangement. Individual injection orifices are distributed along the same radial line on the injector surface. Multiple injection orifices are designed and arranged in a uniform ring on the injection surface according to thrust level and injection pressure drop requirements.

[0128] This process employs a method where the oxidizer and fuel first self-impact, then their respective self-impacting fog fans approach each other in space for secondary atomization and enhanced mixing, creating a good air-fuel mixture and providing conditions for good combustion performance. Specifically, the self-impact pair formed by the first oxidizer axial hole 12 and its corresponding first oxidizer outer oblique hole 11 achieves primary atomization of the oxidizer to form an oxidizer self-impacting fog fan, while the self-impact pair formed by the fuel inner oblique hole 22 and its corresponding fuel outer oblique hole 21 achieves primary atomization of the fuel to form a fuel self-impacting fog fan. Subsequently, the oxidizer self-impacting fog fan and the fuel self-impacting fog fan approach each other in space to achieve mutual impact, promoting secondary atomization of the two propellant components and enhancing their mixing.

[0129] The fuel self-ignition pair outside the injector generates a fuel self-ignition mist fan with a wide spatial expansion width (the distribution range of the fuel self-ignition mist field), which blocks the oxidizer self-ignition mist fan, reduces the amount of central oxidizer that penetrates from both sides of the fuel self-ignition mist fan to the near-wall area, reduces the consumption of the near-wall liquid film in the central main combustion zone of the combustion chamber, keeps the near-wall area in a low-mixing-ratio atmosphere, and improves the cooling and protection effect of the edge liquid film on the wall surface.

[0130] Furthermore, to prevent the spacing between the central oxidizer self-attachment pairs from being too small, causing interference between adjacent oxidizer self-attachment pairs and the oxidizer self-attachment fan, which would lead to the aggregation of atomized particles and the generation of large particles that are not conducive to combustion, the oxidizer self-attachment pairs are arranged in two rings in a uniform and staggered manner to ensure that the oxidizer self-attachment points of adjacent oxidizer self-attachment pairs are not on the same distribution circle, thus preventing interference. The two rings of self-attachment pairs are respectively located on the diameter D1 of the ring where the first oxidizer axial hole 12 is located and the diameter D2 of the ring where the second oxidizer axial hole 14 is located, and the diameter D1 of the ring where the first oxidizer axial hole 12 is located is smaller than the diameter D2 of the ring where the second oxidizer axial hole 14 is located.

[0131] To achieve a better shielding effect between the fuel self-ignition fog fan and the oxidizer self-ignition fog fan, under the condition that the injection pressure drop of the oxidizer and fuel lines is comparable, the fuel self-ignition effect on the combined momentum angle... The value ranges from 0° to 45°, representing the momentum angle of the oxidant's self-hit pair. and the self-hitting of the outer oxidant to synthesize momentum angle The value range is 30° to 60°.

[0132] To better reduce the amount of oxidant protruding, the diameter of the external oblique hole of the oxidant is smaller than the diameter of the axial hole of the oxidant, thereby reducing the amount of oxidant protruding from the external oblique hole into the edge region.

[0133] This invention also provides a method for designing the injection orifice of a DC self-actuating interlocking injector, comprising the following steps: 1) based on the thrust of the injector He Bi Chong The total flow rate of the injector is calculated using the following formula. :

[0134] (1)

[0135] In the formula: The total flow rate of the injector is expressed in kg / s.

[0136] The thrust of the injector, measured in N;

[0137] Specific impulse of the injector, in m / s;

[0138] 2) Calculate the total oxidant flow rate and total fuel flow rate based on the total flow rate of the injector and the mixing ratio, and calculate the total coolant flow rate based on the coolant percentage; details are as follows:

[0139] 2.1. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total flow rate of the oxidant is calculated using the following formula. :

[0140] (2)

[0141] In the formula: This represents the total flow rate of the oxidant, expressed in kg / s.

[0142] 2.2. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total fuel flow rate is calculated using the following formula. :

[0143] (3)

[0144] In the formula: This represents the total flow rate of fuel, expressed in kg / s.

[0145] The mixing ratio of oxidant to fuel is given by a dimensionless parameter.

[0146] This represents the coolant percentage.

[0147] 2.3 Calculate the total coolant flow rate based on the coolant percentage. :

[0148] (4)

[0149] In the formula: This represents the total flow rate of the coolant, expressed in kg / s.

[0150] 3) Based on the injection pressure drop of the oxidant and the total flow rate The pore size of the oxidant pores can be calculated using the following formula:

[0151] (5)

[0152] (6)

[0153] (7)

[0154] In the formula: The flow rate of a single inner-layer oxidant self-impact pair is expressed in kg / s.

[0155] The flow rate of a single outer oxidant self-impact pair is expressed in kg / s.

[0156] The number of self-hit pairs of the inner oxidant or the outer oxidant is a dimensionless parameter.

[0157] is the flow coefficient of the oxidant self-impact pair, and is a dimensionless parameter;

[0158] The density of the oxidant is expressed in kg / m³. 3 ;

[0159] The injection pressure drop of the oxidant is expressed in Pa.

[0160] The inner diameter of the first oxidant external oblique hole 11 is in meters.

[0161] The inner diameter of the first oxidant axial hole 12 is in meters.

[0162] The inner diameter of the second oxidant external oblique hole 13 is in meters;

[0163] The inner diameter of the second oxidant axial hole 14 is in meters.

[0164] 4) Based on the fuel injection pressure drop and total flow rate The diameter of the fuel orifice is calculated using the following formula:

[0165] (8)

[0166] In the above formula: This represents the total flow rate of fuel, expressed in kg / s.

[0167] Let be the flow coefficient of the fuel self-impact pair, and be a dimensionless parameter;

[0168] This refers to the density of the fuel, expressed in kg / m³. 3 ;

[0169] The pressure drop of fuel self-impact on the injection is expressed in Pa.

[0170] The inner diameter of the fuel outer inclined hole 21 is in meters;

[0171] The inner diameter of the fuel incline hole 22 is in meters (m).

[0172] 5) Calculate the diameter of cooling hole 3 using the following formula based on the coolant injection pressure drop and total flow rate:

[0173] (9)

[0174] In the above formula: The inner diameter of cooling hole 3 is in meters (m).

[0175] 6) Calculate the synthesis momentum angle and synthesis velocity of the oxidant self-hit pair, and the synthesis momentum angle and synthesis velocity of the fuel self-hit pair;

[0176] 6.1 Calculate the combined momentum angle of the inner oxidant self-hit pair using the following formula. and synthesis speed :

[0177] (10)

[0178] (11)

[0179] In the formula: The momentum angle of the self-impact pair of the inner oxidant is expressed in degrees.

[0180] The self-impact rate of the inner oxidant is expressed in m / s.

[0181] The angle between the injection direction of the first oxidant external inclined hole 11 and the axis of the injector;

[0182] The angle between the injection direction of the first oxidant axial hole 12 and the axis of the injector;

[0183] 6.2 Calculate the combined momentum angle of the outer oxidant self-hit pair using the following formula. and synthesis speed :

[0184] (12)

[0185] (13)

[0186] In the formula: The momentum angle of the self-impact pair of the outer oxidant is expressed in degrees.

[0187] The value represents the self-impact rate of the outer oxidant, expressed in m / s.

[0188] The angle between the injection direction of the second oxidant external inclined hole 13 and the axis of the injector;

[0189] The angle between the injection direction of the second oxidant axial hole 14 and the axis of the injector;

[0190] 6.3 Calculate the resultant momentum angle of the fuel self-impact pair using the following formula. and synthesis speed :

[0191] (14)

[0192] (15)

[0193] In the formula: The angle of momentum of the fuel self-impact pair is expressed in degrees.

[0194] The fuel self-impact synthesis rate is expressed in m / s.

[0195] The angle between the injection direction of the fuel external inclined hole 21 and the axis of the injector;

[0196] The angle between the injection direction of the fuel inner inclined hole 22 and the axis of the injector;

[0197] 7) Calculate the combined momentum angle and combined velocity of the oxidizer self-impact pair and the fuel self-impact pair after they collide and come into contact with each other, and complete the injection orifice design of the injector.

[0198] 7.1 Calculate the combined momentum angle and combined velocity of the inner oxidizer self-impact pair and the fuel self-impact pair after they collide and come into contact with each other using the following formula:

[0199] (16)

[0200] (17)

[0201] In the formula:

[0202] The momentum angle is the resultant momentum angle after the inner oxidizer self-impact pair and the fuel self-impact pair collide and come into contact with each other, in degrees;

[0203] The synthesis rate after the inner oxidant self-impact pair and the fuel self-impact pair collide and come into contact with each other, in m / s;

[0204] 7.2 Calculate the combined momentum angle and combined velocity of the outer oxidizer self-impact pair and the fuel self-impact pair after they collide and come into contact with each other using the following formula:

[0205] (18)

[0206] (19)

[0207] In the formula:

[0208] The momentum angle is the resultant momentum angle after the outer oxidizer self-impact pair and the fuel self-impact pair collide and come into contact with each other, and the unit is °;

[0209] The synthesis rate is represented by the interaction and contact rate between the outer oxidant self-impact pair and the fuel self-impact pair, expressed in m / s.

Claims

1. A DC self-operated interlocking injector, comprising an injection cylinder and an injection surface, wherein an oxidizer collection chamber (1) and a fuel collection chamber (2) are sequentially arranged from the inside to the outside on the injection cylinder; characterized in that: It also includes multiple injection holes set on the injection surface; The injection holes include multiple oxidant holes arranged sequentially from the inside to the outside and corresponding to the oxidant collection chamber (1), multiple fuel holes and multiple cooling holes (3) corresponding to the fuel collection chamber (2); Multiple oxidant holes form multiple oxidant self-impact pairs; each oxidant self-impact pair includes an inner oxidant self-impact pair and an outer oxidant self-impact pair uniformly arranged along different circumferences; each inner oxidant self-impact pair includes any first oxidant axial hole (12) and its corresponding first oxidant external oblique hole (11) arranged on the same radius of the injection surface; each outer oxidant self-impact pair includes any second oxidant axial hole (14) and its corresponding second oxidant external oblique hole (13) arranged on the same radius of the injection surface; the diameter D1 of the circle containing the first oxidant axial hole (12) is smaller than the diameter D2 of the circle containing the second oxidant axial hole (14); the oxidants ejected along the inner oxidant self-impact pairs collide with each other to form an inner oxidant self-impact mist fan; the oxidants ejected along the outer oxidant self-impact pairs collide with each other to form an outer oxidant self-impact mist fan. The multiple fuel holes form multiple fuel self-punch pairs.

2. The DC self-impacting interlocking injector according to claim 1, characterized in that: The fuel self-impact pair includes any one inner fuel oblique hole (22) and its corresponding outer fuel oblique hole (21) set on the same radius of the injection surface; The outlet end of the fuel internal oblique hole (22) faces the oxidant emission direction; The outlet end of the fuel external oblique hole (21) faces the edge of the injection cylinder; The fuel ejected along the outer inclined hole (21) and the inner inclined hole (22) of the fuel impacts to form a fuel self-attacking fog fan.

3. A DC self-impacting interlocking injector according to claim 2, characterized in that: The angle of resultant momentum formed between the inner oxidant self-ignition mist fan along the self-ignition momentum synthesis direction and the central axis of the injection cylinder. The value range is 30° to 60°; The angle of resultant momentum formed between the outer oxidant self-ignition mist fan along the self-ignition momentum synthesis direction and the central axis of the injection cylinder. The value range is 30° to 60°; The resultant momentum angle formed between the fuel self-ignition mist fan along the direction of self-ignition momentum synthesis and the central axis of the injection cylinder The value range is 0° to 45°; The first mutual-impact fog fan formed by the inner oxidant self-impact fog fan and the fuel self-impact fog fan after they come into contact with each other has a mutual-impact momentum angle β1 formed along the mutual-impact momentum synthesis direction and the central axis of the injection cylinder, which ranges from 0° to 45°. The second mutual-impact fog fan, formed by the outer oxidizer self-impact fog fan and the fuel self-impact fog fan coming into contact with each other, has a mutual-impact momentum angle β2 formed along the mutual-impact momentum synthesis direction and the central axis of the injection cylinder, ranging from 0° to 45°.

4. A DC self-impacting interlocking injector according to claim 3, characterized in that: The number of self-hitting pairs of the inner oxidant is the same as that of the outer oxidant; The first oxidant external oblique hole (11) and the second oxidant external oblique hole (13) are uniformly staggered.

5. A method for designing the injection orifice of a DC self-impacting interlocking injector according to any one of claims 1-4, characterized in that, Includes the following steps: 1) Calculate the total flow rate of the injector based on its thrust and specific impulse; 2) Calculate the total flow rate of oxidizer and total flow rate of fuel based on the total flow rate of the injector and the mixing ratio, and calculate the total flow rate of coolant based on the coolant percentage; 3) Calculate the orifice diameter of the oxidant based on the injection pressure drop and total flow rate; 4) Calculate the orifice diameter of the fuel injection hole based on the fuel injection pressure drop and total flow rate; 5) Calculate the diameter of the cooling hole (3) based on the injection pressure drop and total flow rate of the coolant; 6) Calculate the synthesis momentum angle and synthesis velocity of the oxidant self-impact pair and the synthesis momentum angle and synthesis velocity of the fuel self-impact pair, and complete the injection orifice design of the injector.

6. The nozzle design method for a DC self-impacting interlocking injector according to claim 5, characterized in that, It also includes step 7): Calculate the combined momentum angle and combined velocity of the oxidant self-impact pair and the fuel self-impact pair after they come into contact with each other.

7. The nozzle design method for a DC self-impacting interlocking injector according to claim 6, characterized in that, Step 1) Specifically: Based on the thrust of the injector He Bi Chong The total flow rate of the injector is calculated using the following formula. : ； Step 2) specifically involves: 2.

1. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total flow rate of the oxidant is calculated using the following formula. : ； 2.

2. Based on the total flow rate of the injector The mixing ratio of oxidizer and fuel The total fuel flow rate is calculated using the following formula. : ; In the formula: This represents the coolant percentage. 2.3 Calculate the total coolant flow rate based on the coolant percentage. : ； Step 3) specifically involves: Based on the injection pressure drop of the oxidant and the total flow rate The pore size of the oxidant pores can be calculated using the following formula: ; ; ; In the formula: The flow rate of a single inner-layer oxidant self-impact pair is expressed in kg / s. The flow rate of a single outer oxidant self-impact pair is expressed in kg / s. The number of self-hit pairs of the inner oxidant or the outer oxidant is a dimensionless parameter. Let be the flow coefficient of the oxidant, and be a dimensionless parameter; The density of the oxidant is expressed in kg / m³. 3 ; The injection pressure drop of the oxidant is expressed in Pa. The inner diameter of the first oxidant external oblique hole (11) is in meters; The inner diameter of the first oxidant axial hole (12) is in meters; The inner diameter of the second oxidant external oblique hole (13) is in meters; The inner diameter of the axial hole (14) for the second oxidant is in meters. Step 4) specifically involves: Based on fuel injection pressure drop and total flow rate The diameter of the fuel orifice is calculated using the following formula: ; In the formula: This represents the total flow rate of fuel, expressed in kg / s. Let be the fuel flow coefficient, and be a dimensionless parameter; This refers to the density of the fuel, expressed in kg / m³. 3 ; This represents the fuel injection pressure drop, measured in Pa. The inner diameter of the fuel outer inclined hole (21) is in meters; The inner diameter of the fuel incline hole (22) is in meters; Step 5) specifically involves: Based on the injection pressure drop of the coolant and the total flow rate The diameter of the cooling hole (3) is calculated using the following formula: ； In the formula: The inner diameter of the cooling hole (3) is in meters. Step 6) specifically refers to: 6.1 Calculate the combined momentum angle of the inner oxidant self-hit pair using the following formula. and synthesis speed : ； ； In the formula: The momentum angle of the self-impact pair of the inner oxidant is expressed in degrees. The self-impact rate of the inner oxidant is expressed in m / s. The angle between the injection direction of the first oxidant external inclined hole (11) and the axis of the injector; The angle between the injection direction of the first oxidant axial hole (12) and the axis of the injector; 6.2 Calculate the combined momentum angle of the outer oxidant self-hit pair using the following formula. and synthesis speed : ； ； In the formula: The momentum angle of the self-impact pair of the outer oxidant is expressed in degrees. The value represents the self-impact rate of the outer oxidant, expressed in m / s. The angle between the injection direction of the second oxidant external oblique hole (13) and the axis of the injector; The angle between the injection direction of the second oxidant axial hole (14) and the axis of the injector; 6.3 Calculate the resultant momentum angle of the fuel self-impact pair using the following formula. and synthesis speed : ； ； In the formula: The angle of momentum of the fuel self-impact pair is expressed in degrees. The fuel self-impact synthesis rate is expressed in m / s. The angle between the injection direction of the fuel external inclined hole (21) and the axis of the injector; The angle between the injection direction of the fuel inner inclined hole (22) and the axis of the injector.

8. The nozzle design method for a DC self-impacting interlocking injector according to claim 7, characterized in that, Step 7) specifically refers to: 7.1 Calculate the combined momentum angle and combined velocity of the inner oxidizer self-impact pair and the fuel self-impact pair after they come into contact with each other using the following formula: ； ； In the formula: The angle of momentum formed by the self-impact of the inner oxidizer and the self-impact of the fuel after they come into contact with each other, in degrees; The synthesis rate of the inner oxidant self-impact pair and the fuel self-impact pair after they come into contact with each other, in m / s; 7.2 Calculate the combined momentum angle and combined velocity of the outer oxidizer self-impact pair and the fuel self-impact pair after they come into contact with each other using the following formula: ； ； In the formula: The momentum angle is the resultant momentum angle after the outer oxidizer self-impact pair and the fuel self-impact pair come into contact with each other, and the unit is °; The rate of reaction between the outer oxidant self-impact pair and the fuel self-impact pair after they come into contact with each other is expressed in m / s.

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