Jet flow interference test model device for variable nozzle opening

Abstract

The invention relates to the technical field of experimental devices, in particular to a jet flow interference test model device for variable nozzle opening. The jet flow interference test model device for changing the opening degree of the jet pipe comprises a model jet pipe section, an inner pipeline and a plugging cone, a cavity is formed in the model spray pipe section to serve as a storage chamber, the model spray pipe section is provided with a molded surface spray pipe, and the spray pipe section is provided with a plug cone mounting hole in the axis direction of the opposite side of the spray pipe; an inner pipeline is arranged in the storage chamber and is provided with an inner taper hole in the axis direction of the spray pipe; the rear end of the plugging cone is detachably connected with the plugging cone mounting hole, the front end is located in the spray pipe, and a partial area between the front end and the rear end of the plugging cone is located in the inner cone hole; the jet flow interference test model device for changing the opening degree of the jet pipe comprises a plurality of different plugging cones. According to the invention, different spray pipe plugging cones can be replaced on a set of reference model, so that the opening degree of the spray pipe can be rapidly replaced, the model processing cost is saved, and the implementation of a wind tunnel test is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of experimental devices, in particular to a jet interference test model device for variable nozzle opening. Background Art

[0002] Jet control technology is a new type of aerodynamic control technology that uses the reaction force generated by the engine to change the motion attitude or trajectory of the aircraft. Its role is to make up for the inefficiency of aerodynamic control surfaces and quickly change the flight state. It has the advantages of being unaffected by the incoming flow pressure and fast response speed, and is being applied to more and more aircraft. The application of jet direct force control on aircraft mainly includes attitude control and trajectory control.

[0003] The lateral jet interacts with the external flow to form a complex flow structure including shock waves, separated flow and mutual interference, and causes additional interference forces and torques. The additional interference forces and torques generated are closely related to and very sensitive to the flight environment (such as flight altitude, Mach number and attitude angle, etc.), and show strong nonlinear characteristics. Wind tunnel tests are an important means of studying the interference characteristics of lateral jets, and the test results obtained are also an important basis for verifying the simulation accuracy of numerical methods.

[0004] The actual lateral control engine uses a plugging cone to adjust the jet flow through the engine nozzle throat to achieve the purpose of adjusting and controlling the engine thrust. In order to complete the ground test of nozzles with different openings, multiple model nozzle sections are generally processed, which has a long processing cycle and high processing cost. In addition, the nozzle sections need to be replaced many times during the test, which is not convenient for the implementation of wind tunnel tests. Multiple nozzle replacements may also cause inconsistencies in the model installation status.

[0005] Therefore, we look forward to developing a jet interference test model device for variable nozzle opening. This model device can achieve rapid replacement of nozzles with different openings by changing different nozzle plugging cones on a set of benchmark models, thereby facilitating the completion of lateral jet interference wind tunnel tests under different nozzle opening conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a jet interference test model device for variable nozzle opening, which can realize rapid replacement of nozzles with different openings by changing different nozzle plugging cones on a set of reference models.

[0007] In order to achieve the above-mentioned object, the present invention provides a jet interference test model device for a variable nozzle opening, which comprises: a model nozzle section, an inner pipeline and a blocking cone;

[0008] The model nozzle section has a cavity inside as a storage chamber, the model nozzle section has a profile nozzle, and the nozzle section has a plugging cone installation hole in the axial direction of the opposite side of the nozzle;

[0009] An inner pipeline is arranged in the storage chamber, and the inner pipeline has an inner tapered hole in the direction of the nozzle axis;

[0010] The rear end of the blocking cone is detachably connected to the blocking cone mounting hole, the front end is located in the nozzle, and a portion of the area between the front end and the rear end of the blocking cone is located in the inner cone hole;

[0011] The jet interference test model device for variable nozzle opening includes a plurality of different blocking cones.

[0012] Preferably, the model nozzle section has a spiral body shape;

[0013] One end of the storage chamber of the model nozzle section has a tapered inner hole, and the inner wall of the tapered inner hole of the model nozzle section has a positioning key groove;

[0014] The inner pipe is in the shape of a spiral body, one end of the inner pipe is an outer cone and has a positioning key groove, the inner pipe is connected to the conical inner hole of the nozzle section storage chamber and is positioned by a positioning key; the other end of the inner pipe has a ventilation inner hole and a ventilation hole is opened on the side wall;

[0015] The width of the positioning keyway of the model nozzle section is consistent with the width of the positioning keyway of the inner pipeline.

[0016] Preferably, the diameter of the inner pipeline should be larger than the maximum outer diameter of the inner tapered hole of the inner pipeline;

[0017] The ventilation inner hole of the inner pipeline is only located on one side of the inner tapered hole of the inner pipeline, the cross-sectional area of ​​the ventilation inner hole of the inner pipeline is not less than twice the cross-sectional area of ​​the throat of the profile nozzle, and the equivalent area of ​​the ventilation holes of the inner pipeline is not less than the cross-sectional area of ​​the ventilation inner hole of the inner pipeline.

[0018] Preferably, the blocking cone mounting hole comprises a stepped hole and an internal thread provided on the nozzle section;

[0019] The plugging cone is in the shape of a screw-shaped body, and the plugging cone is a structure of multiple cones, columns and threads;

[0020] One end of the blocking cone is a conical surface, behind the conical surface of the blocking cone is a column section, behind the column section of the blocking cone is a truncated cone surface, the truncated cone surface of the blocking cone is consistent with the conical surface of the conical inner hole of the internal gas path, behind the truncated cone surface of the blocking cone is another cylinder with an external thread, the external thread of the blocking cone is connected to the internal thread of the model nozzle section, and the blocking cone is sealed with the nozzle section through a sealing gasket.

[0021] Preferably, the axis of the blocking cone is coaxial with the axis of the nozzle, and the truncated cone surface of the blocking cone is connected to the inner tapered hole of the inner pipeline to achieve axial positioning;

[0022] The diameter of the cylindrical surface of the blocking cone is greater than the maximum diameter of the conical inner hole of the blocking cone, and the cylindrical surface of the blocking cone is limited in the axial direction by the outer surface of the inner pipeline.

[0023] Preferably, the conical surface of the blocking cone at the nozzle is located within the throat of the nozzle, and is used to adjust the flow area of ​​the airflow through the throat.

[0024] Preferably, the front end of the model nozzle section is connected to a model head, and the model head is in the shape of a spiral body.

[0025] Preferably, the model head has a cavity for weight reduction, and the model head and the model nozzle section are positioned by pins.

[0026] Preferably, it also includes a model rear section and a model support rod;

[0027] The model rear section is in the shape of a rotating body, is sleeved on the tail of the model nozzle section, and is positioned with the model nozzle section through a pin;

[0028] The model support rod is in the shape of a screw body, is inserted into the inner hole of the rear section of the model, and is positioned with the rear section of the model through a pin.

[0029] Preferably, it also includes a gas line connector and a high-pressure gas pipe;

[0030] The gas path connector is in the shape of a screw body, one end of the gas path connector has an inner hole, one end of the inner pipe with the inner hole is inserted into the inner hole of one end of the gas path connector, the gas path connector is connected to the model nozzle section through a thread and sealed by a sealing gasket, and the other end of the gas path connector is a male head connected with a ball head;

[0031] The two ends of the high-pressure air pipe are female ends connected by ball joints, one end of the high-pressure air pipe is connected to the male end of the ball joint of the air path joint, and the other end of the high-pressure air pipe is placed outside the support rod.

[0032] The beneficial effects of the present invention are:

[0033] 1. The jet interference test model device for variable nozzle opening of the present invention can realize rapid replacement of nozzle opening by replacing different nozzle plugging cones on a set of reference models, thereby saving the cost of model processing and facilitating the implementation of wind tunnel tests.

[0034] 2. The jet interference test model device for variable nozzle opening of the present invention can be used for lateral jet interference force measurement, pressure measurement, flow display and other tests to obtain the jet interference flow characteristics and aerodynamic characteristics under different nozzle opening conditions, and can provide accurate data for the verification of numerical simulation methods, providing support for the design of jet direct force control systems for aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a jet interference test model device for a variable nozzle opening provided in a specific embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the structure of a model segment provided for a specific embodiment of the present invention;

[0038] Description of reference numerals:

[0039] 1. Model head; 2. Model nozzle section; 3. Model rear section; 4. Model support rod; 5. Internal pipeline; 6. Air pipeline joint; 7. High-pressure air pipe; 8. Blocking cone; 9. Positioning key; 10. First sealing gasket; 11. Second sealing gasket. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figure 1 , Figure 2 As shown, this embodiment provides a jet interference test model device for variable nozzle opening, which includes: a model head 1, a model nozzle section 2, a model rear section 3, a model support rod 4, an inner pipeline 5, an air circuit connector 6, a high-pressure air pipe 7, a blocking cone 8, a positioning key 9, a first sealing gasket 10 and a second sealing gasket 11.

[0044] The model head 1 is in the shape of a screw body, and the rear end of the model head 1 is provided with a cylindrical surface and a pin hole for connection.

[0045] Specifically, the model head 1 is in a cone shape, with a round head tangent to the cone surface, a cone cavity inside, and two Φ5mm pin holes at the rear section.

[0046] A model nozzle segment 2, wherein the model nozzle segment 2 is in the shape of a spiral body, the model nozzle segment 2 has a profile nozzle, the model nozzle segment 2 has a cavity inside as a storage chamber, one end of the storage chamber of the model nozzle segment 2 has a tapered inner hole, the inner wall of the tapered inner hole of the model nozzle segment 2 has a positioning key 9 groove, the other end of the storage chamber of the model nozzle segment 2 has an internal thread, the nozzle segment has a stepped hole and an internal thread in the axial direction on the opposite side of the nozzle, and the rear end face of the nozzle segment has a pin hole.

[0047] Specifically, the model nozzle section 2 has a conical nozzle with a throat size of Φ5mm, a column section with a conical inner hole of Φ12mm at one end of the storage chamber, a keyway width of 3mm and a length of 5mm, an M10×1.25 internal thread on the opposite side of the nozzle, and an M24×1.5 internal thread at the other end of the storage chamber.

[0048] The model rear section 3 is in the shape of a screw body, is sleeved on the tail of the model nozzle section 2, and is positioned with the model nozzle section 2 through a pin.

[0049] Specifically, the model rear section 3 is a spiral body, and has two pin holes at both ends, which are used for positioning with the model nozzle section 2 and the model support rod 4 respectively.

[0050] The model support rod 4 is in the shape of a screw body, inserted into the inner hole of the model rear section 3, and positioned with the model rear section 3 through a pin.

[0051] Specifically, the model support rod 4 is a screw-in body, and has two pin holes at the front end for positioning with the model rear section 3 .

[0052] The inner pipe 5 has a spiral body shape, one end of the inner pipe 5 is an outer cone and has a positioning key 9 groove, the inner pipe 5 is connected to the tapered inner hole of the nozzle section storage chamber and is positioned by the positioning key 9, the inner pipe 5 has an inner tapered hole in the nozzle axis direction, the other end of the inner pipe 5 has a ventilation inner hole and a ventilation hole is opened on the side wall.

[0053] Specifically, the inner pipe 5 has a diameter of 12 mm, one end of which is a conical surface with the same taper as the inner hole of the storage chamber, and a keyway with a width of 3 mm and a length of 5 mm. It is positioned with the model nozzle section 2 by a positioning key 9. The inner conical hole in the axial direction of the nozzle is a 1:6 conical surface, the ventilation inner hole is Φ8 mm and the wall thickness is 2 mm. There are 4 rows, each row has 4 ventilation holes of Φ1.5 mm evenly distributed.

[0054] The gas circuit connector 6 has a screw-shaped shape, one end of the gas circuit connector 6 has an inner hole, one end of the inner pipe 5 with the inner hole is inserted into the inner hole at one end of the gas circuit connector 6, the gas circuit connector 6 is connected to the model nozzle section 2 through a thread and is sealed by a sealing gasket, and the other end of the gas circuit connector 6 is a male head connected with a ball head.

[0055] Specifically, the inner hole of the gas circuit connector 6 is Φ12mm, one end of the inner pipe 5 is inserted into the gas circuit connector 6, the inner hole of the gas circuit connector 6 has a limited step, one end of the gas circuit connector 6 has an M24×1.5 external thread, which is connected to the model nozzle section and sealed with the model nozzle section through a sealing gasket 11, and the other end of the gas circuit connector 6 has an M22×1.5 external thread and an inner surface of a 37° inner cone.

[0056] The high-pressure air pipe 7 has female ends connected by ball joints at both ends, one end of the high-pressure air pipe 7 is connected to the male end of the ball joint of the air circuit connector 6, and the other end of the high-pressure air pipe 7 is placed outside the support rod.

[0057] Specifically, the high-pressure air pipe 7 is a DN10 Teflon high-pressure resistant hose that can withstand a pressure of 8 MPa. Both ends are M22×1.5 37° ball nuts. One end is connected to and sealed with the air circuit connector, and the other end is used to connect to the peripheral high-pressure air circuit.

[0058] The blocking cone 8 has a spiral body shape, and is a structure of multiple cones, columns and threads. One end of the blocking cone 8 is a conical surface, and behind the conical surface of the blocking cone 8 is a column section, and behind the column section of the blocking cone 8 is a truncated cone surface. The truncated cone surface of the blocking cone 8 is consistent with the conical surface of the conical inner hole of the inner gas path, and behind the truncated cone surface of the blocking cone 8 is another column surface and is equipped with an external thread. The external thread of the blocking cone 8 is connected to the internal thread of the model nozzle section 2, and the blocking cone 8 is sealed with the nozzle section through a sealing gasket.

[0059] Specifically, the blocking cone 8 is in the form of a multi-section cone-column plus thread. The diameter of the column section at one end is Φ2mm, which can reduce the flow area of ​​the nozzle throat by 16% relative to the nozzle throat diameter of Φ5mm. The conical surface connected to the inner conical hole of the inner pipeline has a taper of 1:6, and the thread connected to the nozzle section is M10×1.25.

[0060] The positioning key 9 has a width of 3 mm, a length of 4.5 mm, and a height of 4 mm.

[0061] The first sealing gasket 10 and the second sealing gasket 11 are both made of polytetrafluoroethylene and have a thickness of 2.5 mm.

[0062] The model head 1 has a cavity for reducing weight, and the model head 1 and the model nozzle section 2 are positioned by pins.

[0063] The width of the positioning key 9 groove of the model nozzle section 2 is consistent with the width of the positioning key 9 groove of the inner pipeline 5.

[0064] The diameter of the inner pipeline 5 should be larger than the maximum outer diameter of the inner tapered hole of the inner pipeline 5 .

[0065] The ventilation inner hole of the inner pipeline 5 is only located on one side of the inner tapered hole of the inner pipeline 5, the cross-sectional area of ​​the ventilation inner hole of the inner pipeline 5 is not less than twice the cross-sectional area of ​​the throat of the profile nozzle, and the equivalent area of ​​the ventilation holes of the inner pipeline 5 is not less than the cross-sectional area of ​​the ventilation inner hole of the inner pipeline 5.

[0066] The axis of the blocking cone 8 is coaxial with the axis of the nozzle, and the truncated cone surface of the blocking cone 8 is connected to the tapered inner hole of the inner pipeline 5 to achieve axial positioning.

[0067] The conical surface of the blocking cone 8 at the nozzle is located within the throat of the nozzle and is used to adjust the flow area of ​​the airflow passing through the throat.

[0068] The diameter of the cylindrical surface of the blocking cone 8 is larger than the maximum diameter of the conical inner hole of the blocking cone 8 . The cylindrical surface of the blocking cone 8 is limited in the axial direction with the outer surface of the inner pipeline 5 , thereby controlling the blocking degree of the nozzle by the blocking cone 8 .

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A jet interference test model device for variable nozzle opening, characterized in that: include: Model nozzle section, inner pipe and plugging cone; The model nozzle section has a cavity inside as a storage chamber, the model nozzle section has a profile nozzle, and the model nozzle section has a plugging cone installation hole in the axial direction of the opposite side of the nozzle; An inner pipeline is arranged in the storage chamber, and the inner pipeline has an inner tapered hole in the direction of the nozzle axis; The rear end of the blocking cone is detachably connected to the blocking cone mounting hole, the front end is located in the nozzle, and a portion of the area between the front end and the rear end of the blocking cone is located in the inner cone hole; The jet interference test model device for variable nozzle opening includes a plurality of different blocking cones.

2. The jet interference test model device for variable nozzle opening according to claim 1, characterized in that: The model nozzle section is in the shape of a spiral body; One end of the storage chamber of the model nozzle section has a tapered inner hole, and the inner wall of the tapered inner hole of the model nozzle section has a positioning key groove; The inner pipeline is in the shape of a spiral body, one end of the inner pipeline is an outer cone and has a positioning key groove, the inner pipeline is connected to the conical inner hole of the storage chamber of the model nozzle section and is positioned by a positioning key; the other end of the inner pipeline has a ventilation inner hole and a ventilation hole is opened on the side wall; The width of the positioning keyway of the model nozzle section is consistent with the width of the positioning keyway of the inner pipeline.

3. The jet interference test model device for variable nozzle opening according to claim 2, characterized in that: The diameter of the inner pipeline should be larger than the maximum outer diameter of the inner tapered hole of the inner pipeline; The ventilation inner hole of the inner pipeline is only located on one side of the inner tapered hole of the inner pipeline, the cross-sectional area of ​​the ventilation inner hole of the inner pipeline is not less than twice the cross-sectional area of ​​the throat of the profile nozzle, and the equivalent area of ​​the ventilation holes of the inner pipeline is not less than the cross-sectional area of ​​the ventilation inner hole of the inner pipeline.

4. The jet interference test model device for variable nozzle opening according to claim 2, characterized in that: The plugging cone mounting hole comprises a stepped hole and an internal thread arranged on the nozzle section; The plugging cone is in the shape of a screw-shaped body, and the plugging cone is a structure of multiple cones, columns and threads; One end of the blocking cone is a conical surface, behind the conical surface of the blocking cone is a column section, behind the column section of the blocking cone is a truncated cone surface, the truncated cone surface of the blocking cone is consistent with the conical surface of the conical inner hole of the internal gas path, behind the truncated cone surface of the blocking cone is another cylinder with an external thread, the external thread of the blocking cone is connected to the internal thread of the model nozzle section, and the blocking cone is sealed with the nozzle section through a sealing gasket.

5. The jet interference test model device for variable nozzle opening according to claim 4, characterized in that: The axis of the plugging cone is coaxial with the axis of the nozzle, and the truncated cone surface of the plugging cone is connected to the inner tapered hole of the inner pipeline to achieve axial positioning; The diameter of the cylindrical surface of the blocking cone is greater than the maximum diameter of the conical inner hole of the blocking cone, and the cylindrical surface of the blocking cone is limited in the axial direction by the outer surface of the inner pipeline.

6. The jet interference test model device for variable nozzle opening according to claim 4, characterized in that: The conical surface of the blocking cone at the nozzle is located within the throat of the nozzle and is used to adjust the flow area of ​​the airflow passing through the throat.

7. The jet interference test model device for variable nozzle opening according to claim 1, characterized in that: The front end of the model nozzle section is connected with a model head, and the model head is in a spiral body shape.

8. The jet interference test model device for variable nozzle opening according to claim 7, characterized in that: The model head has a cavity for reducing weight, and the model head and the model nozzle section are positioned by pins.

9. The jet interference test model device for variable nozzle opening according to claim 1, characterized in that: Also included are a model rear section and a model support rod; The model rear section is in the shape of a rotating body, is sleeved on the tail of the model nozzle section, and is positioned with the model nozzle section through a pin; The model support rod is in the shape of a screw body, is inserted into the inner hole of the rear section of the model, and is positioned with the rear section of the model through a pin.

10. The jet interference test model device for variable nozzle opening according to claim 9, characterized in that: It also includes a gas line connector and a high-pressure gas pipe; The gas path connector is in the shape of a screw body, one end of the gas path connector has an inner hole, one end of the inner pipe with the inner hole is inserted into the inner hole of one end of the gas path connector, the gas path connector is connected to the model nozzle section through a thread and sealed by a sealing gasket, and the other end of the gas path connector is a male head connected with a ball head; The two ends of the high-pressure air pipe are female ends connected by ball joints, one end of the high-pressure air pipe is connected to the male end of the ball joint of the air path joint, and the other end of the high-pressure air pipe is placed outside the support rod.

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