A test model device for jet interference with variable nozzle opening

Abstract

This invention relates to the field of experimental apparatus technology, and in particular to a jet interference test model apparatus for variable nozzle opening. The jet interference test model apparatus for variable nozzle opening includes a model nozzle section, an inner pipeline, and a plug cone. The model nozzle section has a cavity inside serving as a storage chamber. The model nozzle section has a profiled nozzle, and the nozzle section has a plug cone mounting hole on the axial direction opposite to the nozzle. An inner pipeline is installed inside the storage chamber, and the inner pipeline has an inner cone hole on the nozzle axis. The rear end of the plug cone is detachably connected to the plug cone mounting hole, the front end is located inside the nozzle, and a portion of the area between the front and rear ends of the plug cone is located within the inner cone hole. The jet interference test model apparatus for variable nozzle opening includes multiple different plug cones. This invention enables rapid change of nozzle opening on a single reference model by replacing different nozzle plug cones, saving model manufacturing costs and facilitating wind tunnel testing.

Description

Technical Field

[0001] This invention relates to the field of experimental apparatus technology, and in particular to a jet interference test model apparatus for variable nozzle opening. Background Technology

[0002] Jet direct force control technology is a novel aerodynamic control technology that utilizes the reaction force generated by the engine to change the attitude or trajectory of an aircraft. Its purpose is to compensate for the inefficiency of aerodynamic control surfaces and to rapidly change flight states. It has advantages such as being unaffected by incoming dynamic pressure and having a fast response speed, and is being applied to an increasing number of aircraft. The main applications of jet direct force control in aircraft include attitude control and trajectory control.

[0003] Lateral jets interact with the external flow, forming a complex flow structure that includes shock waves, separated flows, and mutual interference, resulting in additional disturbance forces and moments. These forces and moments are closely related to and highly sensitive to the flight environment (such as flight altitude, Mach number, and attitude angles), exhibiting strong nonlinear characteristics. Wind tunnel testing is an important research tool for studying the disturbance characteristics of lateral jets, and the experimental results obtained are also an important basis for verifying the accuracy of numerical simulation methods.

[0004] In practice, lateral control engines use a plug cone to adjust the jet flow rate through the engine nozzle throat, thereby regulating and controlling engine thrust. To complete ground tests with nozzles of different openings, multiple model nozzle sections are typically fabricated. This process is time-consuming and costly, and requires multiple nozzle section replacements during testing, which is inconvenient for wind tunnel testing. Furthermore, multiple nozzle replacements may lead to inconsistencies in the model's installation status.

[0005] Therefore, it is desirable to develop a jet interference test model device for variable nozzle opening. This model device can quickly change the nozzle opening by changing different nozzle plug cones on a set of reference models, which is convenient for completing lateral jet interference wind tunnel tests under different nozzle opening conditions. Summary of the Invention

[0006] The purpose of this invention is to provide a jet interference test model device for variable nozzle opening, which enables rapid replacement of different nozzle openings by changing different nozzle plug cones on a set of reference models.

[0007] To achieve the above objectives, the present invention provides a jet interference test model device for variable nozzle opening, comprising: a model nozzle section, an inner pipeline, and a plug cone;

[0008] The model nozzle section has a cavity inside as a storage chamber, the model nozzle section has a profiled nozzle, and the nozzle section has a plug cone mounting hole on the axial direction opposite to the nozzle.

[0009] The storage chamber is provided with an internal pipeline, and the internal pipeline has an internal conical hole in the direction of the nozzle axis;

[0010] The rear end of the plug cone is detachably connected to the plug cone mounting hole, the front end is located inside the nozzle, and a portion of the area between the front and rear ends of the plug cone is located inside the inner cone hole.

[0011] The jet interference test model device for variable nozzle opening includes multiple different plug cones.

[0012] Preferably, the model nozzle section has a spiral-shaped profile;

[0013] The model nozzle section has a conical inner hole at one end of its storage chamber, and the inner wall of the conical inner hole of the model nozzle section has a positioning keyway.

[0014] The inner pipeline is shaped like a spiral body. One end of the inner pipeline is an outer conical surface with a positioning keyway. The inner pipeline is connected to the conical inner hole of the nozzle section storage chamber and is positioned by the positioning key. The other end of the inner pipeline has a venting inner hole and a small venting hole is opened on the side wall.

[0015] The width of the positioning keyway in the nozzle section of the model is the same as the width of the positioning keyway in the inner pipeline.

[0016] Preferably, the diameter of the inner conduit should be greater than the maximum outer diameter of the inner conical hole of the inner conduit;

[0017] The venting orifice of the inner pipeline is located only on one side of the inner conical hole of the inner pipeline. The cross-sectional area of ​​the venting orifice of the inner pipeline is not less than twice the cross-sectional area of ​​the nozzle throat. The equivalent area of ​​the venting orifice of the inner pipeline is not less than the cross-sectional area of ​​the venting orifice of the inner pipeline.

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

[0019] The plug cone has a spirally shaped body and is a structure consisting of multiple cone-cylinder threads;

[0020] One end of the plug cone is a conical surface, and behind the conical surface of the plug cone is a cylindrical section. Behind the cylindrical section of the plug cone is a truncated conical surface. The truncated conical surface of the plug cone is consistent with the conical surface of the conical inner hole of the internal air passage. Behind the truncated conical surface of the plug cone is another cylindrical surface with external threads. The external threads of the plug cone are connected to the internal threads of the model nozzle section. The plug cone is sealed to the nozzle section by a sealing gasket.

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

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

[0023] Preferably, the conical surface of the plug cone at the nozzle is located within the nozzle throat area, 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 has a spiral shape.

[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 the rear section of the model and model support rods;

[0027] The rear section of the model is shaped like a spiral body and is fitted onto the tail of the nozzle section of the model, and is positioned with the nozzle section of the model by a pin.

[0028] The model support rod is shaped like a spiral body, inserted into the inner hole of the rear section of the model, and positioned with the rear section of the model by a pin.

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

[0030] The air connector is shaped like a spiral body. One end of the air connector has an inner hole. The end of the inner pipe with an inner hole is inserted into the inner hole of the air connector. The air connector is connected to the model nozzle section by threads and sealed by a sealing gasket. The other end of the air connector is a male connector with a ball joint.

[0031] The high-pressure air pipe has female ball joints at both ends. One end of the high-pressure air pipe is connected to the male ball joint of the air circuit connector, and the other end of the high-pressure air pipe is placed outside the support rod.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. The jet interference test model device for variable nozzle opening of the present invention can quickly change the nozzle opening by replacing different nozzle plug cones on a set of reference models, saving the cost of model processing and facilitating wind tunnel testing.

[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 verification of numerical simulation methods, and provide support for the design of jet direct force control system of aircraft. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the structure of the jet interference test model device for variable nozzle opening provided for 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] Explanation of reference numerals in the attached figures:

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

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the 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: model head 1, model nozzle section 2, model rear section 3, model support rod 4, inner pipeline 5, air line connector 6, high-pressure air pipe 7, plug cone 8, positioning key 9, first sealing gasket 10 and second sealing gasket 11.

[0044] Model head 1, which is a spiral-shaped body, has a cylindrical surface and a pin hole at the rear end for connection.

[0045] Specifically, the head of the model is conical, with a rounded head that is tangent to the conical surface. It has a conical cavity inside and two Φ5mm pin holes at the rear.

[0046] Model nozzle section 2, which is shaped like a spiral body, has a shaped nozzle, and has an internal cavity serving as a storage chamber. One end of the storage chamber has a tapered inner hole, and the inner wall of the tapered inner hole has a locating key groove. The other end of the storage chamber has an internal thread. The nozzle section has a stepped hole and an internal thread on the axial direction opposite to the nozzle. The rear end face of the nozzle section has a pin hole.

[0047] Specifically, model nozzle section 2 has a conical nozzle with a throat size of Φ5mm, a column section with a conical inner hole at one end of the storage chamber of Φ12mm, 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 rear section 3 of the model is shaped like a spiral body and is fitted onto the tail of the nozzle section 2 of the model, and is positioned with the nozzle section 2 of the model by a pin.

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

[0050] Model support rod 4, which is shaped like a spiral, is inserted into the inner hole of the rear section 3 of the model and is positioned with the rear section 3 of the model by a pin.

[0051] Specifically, the model support rod 4 is a spirally formed body with two pin holes at the front end for positioning with the rear section 3 of the model.

[0052] The inner pipe 5 is shaped like a spiral body. One end of the inner pipe 5 is an outer conical surface with a positioning key 9 groove. The inner pipe 5 is connected to the conical inner hole of the nozzle section storage chamber and is positioned by the positioning key 9. The inner pipe 5 has an inner conical hole in the direction of the nozzle axis. The other end of the inner pipe 5 has a venting inner hole and a small venting hole is opened on the side wall.

[0053] Specifically, the inner pipe 5 has a diameter of 12mm, one end of which is a tapered surface with the same taper as the inner hole of the storage chamber, and has a keyway with a width of 3mm and a length of 5mm. It is positioned with the model nozzle section 2 by the positioning key 9. The inner tapered hole in the direction of the nozzle axis is a tapered surface with a ratio of 1:6. The venting inner hole is Φ8mm with a wall thickness of 2mm, and there are 4 rows of 4 evenly distributed Φ1.5mm venting holes in each row.

[0054] The air connector 6 is shaped like a spiral body. One end of the air connector 6 has an inner hole. The end of the inner pipe 5 with an inner hole is inserted into the inner hole of one end of the air connector 6. The air connector 6 is connected to the model nozzle section 2 by threads and sealed by a sealing gasket. The other end of the air connector 6 is a male head with a ball joint.

[0055] Specifically, the inner hole of the air connector 6 is Φ12mm. One end of the inner pipe 5 is inserted into the air connector 6. The inner hole of the air connector 6 has a limit step. One end of the air 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 the sealing gasket 11. The other end of the air connector 6 has an M22×1.5 external thread and an inner surface of 37° inner cone.

[0056] The high-pressure air pipe 7 has female ball joints at both ends. One end of the high-pressure air pipe 7 is connected to the male 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 8MPa. Both ends are M22×1.5 37° ball head nuts. One end is connected to the air circuit connector and sealed, and the other end is used to connect to the external high-pressure air circuit.

[0058] The plug cone 8 is a spirally shaped body with multiple conical-cylinder threads. One end of the plug cone 8 is a conical surface, followed by a cylindrical section. The cylindrical section is followed by a truncated conical surface, which is consistent with the conical surface of the inner conical hole of the internal air passage. The truncated conical surface is followed by another cylindrical surface with external threads. The external threads of the plug cone 8 are connected to the internal threads of the model nozzle section 2. The plug cone 8 is sealed to the nozzle section by a sealing gasket.

[0059] Specifically, the plug cone 8 is a multi-segment cone-cylinder with thread. The diameter of one end of the cylindrical segment is Φ2mm, which can reduce the flow area of ​​the nozzle throat by 16% compared to the nozzle throat diameter of Φ5mm. The cone surface for connection and positioning with the inner cone hole of the inner pipeline has a 1:6 taper, and the thread for connection with the nozzle segment is M10×1.25.

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

[0061] Both the first sealing gasket 10 and the second sealing gasket 11 are made of polytetrafluoroethylene (PTFE) with a thickness of 2.5 mm.

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

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

[0064] The diameter of the inner pipe 5 should be greater than the maximum outer diameter of the inner conical hole of the inner pipe 5.

[0065] The venting orifice of the inner pipe 5 is located only on one side of the inner conical hole of the inner pipe 5. The cross-sectional area of ​​the venting orifice of the inner pipe 5 is not less than twice the cross-sectional area of ​​the nozzle throat. The equivalent area of ​​the venting orifice of the inner pipe 5 is not less than the cross-sectional area of ​​the venting orifice of the inner pipe 5.

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

[0067] The cone 8 has a conical surface at the nozzle located within the nozzle throat area, which is used to adjust the flow area of ​​the airflow through the throat.

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

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 flow interference test model device for variable nozzle opening, characterized in that, include: Model nozzle section, internal piping, and plug cone; The model nozzle section has an internal cavity serving as a storage chamber. The model nozzle section has a profiled nozzle. The model nozzle section has a plug cone mounting hole on the axial direction opposite to the nozzle. The storage chamber is provided with an internal pipeline, and the internal pipeline has an internal conical hole in the direction of the nozzle axis; The rear end of the plug cone is detachably connected to the plug cone mounting hole, the front end is located inside the nozzle, and a portion of the area between the front and rear ends of the plug cone is located inside the inner cone hole. The jet interference test model device for variable nozzle opening includes multiple different plug cones; The axis of the plug cone is coaxial with the axis of the nozzle, and the truncated cone surface of the plug cone is connected to the inner cone hole of the inner pipeline to achieve axial positioning; The diameter of the cylindrical surface of the plug cone is larger than the maximum diameter of the conical inner hole of the plug cone, and the cylindrical surface of the plug cone is limited in the axial direction with the outer surface of the inner pipeline; The cone-shaped surface of the plug cone at the nozzle is located within the nozzle throat area and is used to adjust the flow area of ​​the airflow through the throat.

2. The jet interference test model device for variable nozzle opening according to claim 1, characterized in that, The model nozzle section has a spiral-shaped form; The model nozzle section has a conical inner hole at one end of its storage chamber, and the inner wall of the conical inner hole of the model nozzle section has a positioning keyway. The inner pipe is shaped like a spiral body. One end of the inner pipe is an outer conical surface with a positioning keyway. The inner pipe is connected to the conical inner hole of the reservoir of the model nozzle section and is positioned by the positioning key. The other end of the inner pipe has a venting inner hole and a small venting hole is opened on the side wall. The width of the positioning keyway in the nozzle section of the model is the same as the width of the positioning keyway in 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 pipe should be greater than the maximum outer diameter of the inner conical hole of the inner pipe; The venting orifice of the inner pipeline is located only on one side of the inner conical hole of the inner pipeline. The cross-sectional area of ​​the venting orifice of the inner pipeline is not less than twice the cross-sectional area of ​​the nozzle throat. The equivalent area of ​​the venting orifice of the inner pipeline is not less than the cross-sectional area of ​​the venting orifice of the inner pipeline.

4. The jet interference test model device for variable nozzle opening according to claim 2, characterized in that, The plug cone mounting hole includes a stepped hole and an internal thread provided on the nozzle section; The plug cone has a spirally shaped body and is a structure consisting of multiple cone-cylinder threads; One end of the plug cone is a conical surface, and behind the conical surface of the plug cone is a cylindrical section. Behind the cylindrical section of the plug cone is a truncated conical surface. The truncated conical surface of the plug cone is consistent with the conical surface of the conical inner hole of the inner pipeline. Behind the truncated conical surface of the plug cone is another cylindrical surface with external threads. The external threads of the plug cone are connected to the internal threads of the model nozzle section. The plug cone is sealed to the nozzle section by a sealing gasket.

5. 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 to the model head, which is in the shape of a spiral body.

6. The jet interference test model device for variable nozzle opening according to claim 5, characterized in that, The model head has a cavity for weight reduction, and the model head and the model nozzle section are positioned by pins.

7. The jet interference test model device for variable nozzle opening according to claim 1, characterized in that, It also includes the rear section of the model and the model support rods; The rear section of the model is shaped like a spiral body and is fitted onto the tail of the nozzle section of the model, and is positioned with the nozzle section of the model by a pin. The model support rod is shaped like a spiral body, inserted into the inner hole of the rear section of the model, and positioned with the rear section of the model by a pin.

8. The jet interference test model device for variable nozzle opening according to claim 7, characterized in that, It also includes gas connectors and high-pressure gas pipes; The air connector is shaped like a spiral body. One end of the air connector has an inner hole. The end of the inner pipe with an inner hole is inserted into the inner hole of the air connector. The air connector is connected to the model nozzle section by threads and sealed by a sealing gasket. The other end of the air connector is a male connector with a ball joint. The high-pressure air pipe has female ball joints at both ends. One end of the high-pressure air pipe is connected to the male ball joint of the air circuit connector, and the other end of the high-pressure air pipe is placed outside the support rod.

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