A test device for reverse jet flow of tail nozzle in a sub-span super-wind tunnel

Abstract

This utility model relates to a reverse jet flow test device for a sub-span supersonic wind tunnel nozzle, belonging to the field of wind tunnel testing. A through hole is provided at the axis of the ventilation support rod. The axial tail end of the internal ventilation pipe is coaxially connected to the small-diameter end of the ventilation support rod. A tubular ventilation balance is fitted onto the outer wall of the internal ventilation pipe, with its axial end connected to the small-diameter end of the ventilation support rod. The connection between the tubular ventilation balance and the ventilation support rod is positioned by a pin. A replaceable nozzle is coaxially connected to the axial head end of the internal ventilation pipe. The test model is coaxially fitted onto the outer wall of the replaceable nozzle, internal ventilation pipe, tubular ventilation balance, and ventilation support rod, and is locked to the outer wall of the tubular ventilation balance with screws. The air supply pipe connector is installed at the opening at the large-diameter end of the ventilation support rod. This utility model solves the problem of backflow forming inside the model in this type of test, causing distortion of the flow field in the nozzle area, while also eliminating the temperature effect of the internal airflow on the balance, ensuring measurement accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of wind tunnel testing and relates to a test device for reverse jet flow of the tail nozzle of a sub-span super-wind tunnel. Background Technology

[0002] With the rapid development of aerospace technology, higher demands are being placed on the control efficiency and launch cost of missiles, rockets, and other aircraft. Air-to-air missiles employing over-the-shoulder launch and reverse launch technologies can achieve shorter reaction times, higher maneuverability, and control efficiency; launch vehicles using vertical landing and recovery technologies can significantly reduce launch costs and shorten launch cycles. In both of these scenarios, the aircraft's motion direction is the same as the booster jet direction, while during normal flight, its motion direction is opposite to the booster jet direction; hence, this can be termed reverse jet. The mutual disturbance between the incoming flow and the jet in this state is extremely complex, significantly impacting the aerodynamic characteristics of the rocket body, such as control efficiency and stability. Therefore, wind tunnel testing to verify the interference of reverse jet on the rocket body is crucial for improving its stability and control efficiency. Due to wind tunnel size limitations, the model is relatively small, and the jet test setup is quite complex, especially the design of multi-nozzle transverse jet devices, which presents even greater challenges. Summary of the Invention

[0003] The technical problem solved by this utility model is to overcome the shortcomings of the existing technology and propose a reverse jet flow test device for the tail nozzle of a sub-span super wind tunnel. This device solves the problem of backflow forming inside the model in this type of test, which causes distortion of the flow field in the nozzle area. At the same time, it eliminates the temperature effect of the internal airflow on the balance and ensures the measurement accuracy.

[0004] The solution of this utility model is:

[0005] A test device for reverse jet flow of tail nozzle in a sub-span super wind tunnel includes a replaceable tail nozzle, a test model, an internal venting pipe, a tubular venting balance, a venting support rod, an air supply pipe connector, a pin, and screws.

[0006] The system comprises: a horizontally positioned conical column structure with a through hole along its axis; an internal vent pipe with a cylindrical structure, the axial end of which is coaxially connected to the small-diameter end of the vent rod; a tubular vent balance with a cylindrical structure, fitted onto the outer wall of the internal vent pipe, with its axial end connected to the small-diameter end of the vent rod; a pin-positioned joint between the tubular vent balance and the vent rod; a replaceable nozzle coaxially connected to the axial head end of the internal vent pipe; a test model coaxially fitted onto the outer walls of the replaceable nozzle, internal vent pipe, tubular vent balance, and vent rod, with the inner wall of the test model locked to the outer wall of the tubular vent balance by screws; and an air supply pipe connector installed at the opening at the large-diameter end of the vent rod.

[0007] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the axial tail end of the replaceable tail nozzle and the axial head end of the internal vent pipe are connected by fine thread to ensure connection strength and airtightness; the replaceable tail nozzle does not contact the test model.

[0008] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the tubular ventilation balance is a two-component balance, or a three-component balance, or a four-component balance, or a five-component balance.

[0009] In the above-mentioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the tubular ventilation balance includes a measuring end, a measuring element and a supporting end;

[0010] The measuring end, measuring element, and support end are all cylindrical structures; the measuring end, measuring element, and support end are connected sequentially along the axial direction; the outer wall of the measuring end is connected to the inner wall of the test model; and the tail end of the support end is connected to the head end of the ventilation support rod.

[0011] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the measuring end and the measuring element, as well as the measuring element and the supporting end, are all connected by thin-walled structures.

[0012] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the thin-walled structure is a cylindrical structure; four protrusions are evenly distributed along the axial direction on the sidewall of the thin-walled structure; the protrusions are cuboid structures and are arranged parallel to the axial direction of the thin-walled structure.

[0013] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the tail end of the internal vent pipe and the inner hole of the head end of the vent support rod are fitted with a cylindrical surface, and are fixed and sealed at the front end of the vent support rod by brazing.

[0014] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the head end of the internal vent pipe is threadedly connected to the rear end of the replaceable tail nozzle; the internal vent pipe passes through the central hole of the tubular venting balance and does not contact the tubular venting balance.

[0015] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the through hole of the ventilation support rod allows high-pressure gas to pass through; the outer wall of the tail end of the ventilation support rod is fitted with a conical surface and installed on the external wind tunnel support mechanism.

[0016] In the aforementioned sub-span super wind tunnel tail nozzle reverse jet flow test device, the air supply pipeline connector is installed at the tail end of the ventilation support rod using a threaded connection, and the air supply pipeline connector is connected to the external air supply pipeline.

[0017] The advantages of this utility model compared with the prior art are:

[0018] (1) This utility model solves the problem of backflow forming inside the model in this type of test, which causes the flow field in the nozzle area to be distorted. At the same time, it eliminates the temperature effect of the internal airflow on the balance and ensures the measurement accuracy.

[0019] (2) This utility model realizes the function of replacing nozzles of different sizes under the limited internal space of the model cavity;

[0020] (3) The device of this utility model has the characteristics of compact structure, small size and simple operation. It realizes the reverse jet test under the limited space of the model cavity and has high efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the reverse jet flow test device for the tail nozzle of the sub-span super wind tunnel of this utility model;

[0022] Figure 2 This is a structural diagram of the tubular ventilated balance of this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments.

[0024] This invention proposes a reverse jet flow test device for the tail nozzle of a sub-span super wind tunnel. The device features a compact structure, small size, and simple operation. It realizes the reverse jet flow test under the limited space of the model cavity and has high efficiency.

[0025] Subspan supersonic wind tunnel tail nozzle reverse jet flow test device, such as Figure 1 As shown, it specifically includes a replaceable tail nozzle 1, a test model 2, an internal vent pipe 3, a tubular venting balance 4, a venting strut 5, an air supply line connector 6, a pin 7, and screws 8. Among them, the ventilation support rod 5 is a cone-shaped structure placed horizontally in the axial direction; a through hole is provided at the axis of the ventilation support rod 5; the internal ventilation pipe 3 is a cylindrical structure; the axial tail end of the internal ventilation pipe 3 is coaxially connected to the small diameter end of the ventilation support rod 5; the tubular ventilation balance 4 is a cylindrical structure; the tubular ventilation balance 4 is fitted on the outer wall of the internal ventilation pipe 3; and the axial end of the tubular ventilation balance 4 is connected to the small diameter end of the ventilation support rod 5; the connection between the tubular ventilation balance 4 and the ventilation support rod 5 is positioned by a pin 7; the replaceable tail nozzle 1 is coaxially connected to the axial head end of the internal ventilation pipe 3; the test model 2 is coaxially fitted on the outer wall of the replaceable tail nozzle 1, the internal ventilation pipe 3, the tubular ventilation balance 4, and the ventilation support rod 5, and the inner wall of the test model 2 is locked to the outer wall of the tubular ventilation balance 4 by screws 8; the air supply pipe connector 6 is installed at the opening at the large diameter end of the ventilation support rod 5.

[0026] The axial tail end of the replaceable tail nozzle 1 is connected to the axial head end of the internal vent pipe 3 by fine thread to ensure connection strength and airtightness; the replaceable tail nozzle 1 does not contact the test model 2.

[0027] In this utility model, the tubular ventilated balance 4 is a two-component balance, a three-component balance, a four-component balance, or a five-component balance. For example... Figure 2 As shown, the tubular ventilation balance 4 includes a measuring end 4-1, a measuring element 4-2, and a support end 4-3. The measuring end 4-1, the measuring element 4-2, and the support end 4-3 are all cylindrical structures; the measuring end 4-1, the measuring element 4-2, and the support end 4-3 are connected sequentially along the axial direction; the outer wall of the measuring end 4-1 is connected to the inner wall of the test model 2; and the tail end of the support end 4-3 is connected to the head end of the ventilation support rod 5.

[0028] The measuring end 4-1 and the measuring element 4-2, as well as the measuring element 4-2 and the supporting end 4-3, are connected by a thin-walled structure. The thin-walled structure is a cylindrical structure; four protrusions are evenly distributed along the axial direction on the sidewall of the thin-walled structure; the protrusions are cuboid structures and are arranged parallel to the axial direction of the thin-walled structure.

[0029] The tail end of the internal vent pipe 3 is fitted with the inner hole of the head end of the vent support rod 5 using a cylindrical surface, and is fixed and sealed at the front end of the vent support rod 5 by brazing.

[0030] The head end of the internal vent pipe 3 is threaded to the rear end of the replaceable tail nozzle 1; the internal vent pipe 3 passes through the center hole of the tubular venting balance 4 and does not contact the tubular venting balance 4.

[0031] The through hole of the ventilation support rod 5 allows high-pressure gas to pass through; the outer wall of the tail end of the ventilation support rod 5 is fitted with a conical surface to be mounted on the external wind tunnel support mechanism. The air supply pipe connector 6 is installed at the tail end of the ventilation support rod 5 with a threaded connection, and the air supply pipe connector 6 is connected to the external air supply pipe.

[0032] The installation and testing process of the reverse jet flow test device for the tail nozzle of the sub-span super-wind tunnel is as follows:

[0033] First, install the ventilation strut 5 onto the wind tunnel support mechanism and tighten it with wedges. Then, connect the rear end of the internal ventilation pipe 3 to the inner hole at the front end of the ventilation strut 5, and weld and seal it at the front end face of the ventilation strut 5. Next, install the support end of the tubular ventilation balance 4 onto the outer cylindrical surface at the front end of the ventilation strut 5 and secure it with pins 7. Install the air supply pipe connector 6 at the tail end of the ventilation strut 5 and connect it to the external air supply pipe.

[0034] Experimental model 2 is divided into front section 2-1 and rear section 2-1, which are coaxially connected.

[0035] Next, install the rear section 2-2 of the test model 2 onto the measuring end of the tubular ventilation balance 4 and tighten it with screw 8. Then connect the threads of the replaceable tail nozzle 1 and the front end of the internal ventilation pipe 3 until they cannot be tightened.

[0036] Finally, the front section 2-1 of the test model 2 is installed at the front end of the rear section 2-2 and fixed with the pin 7.

[0037] During the test, the air supply pipe connector 6 was installed at the tail end of the ventilation support rod 5 and connected to the external air supply pipe. The airflow passed through the through hole at the center of the ventilation support rod 5, through the front and rear ends, entered the internal ventilation pipe 3, and was finally ejected by the replacement tail nozzle 1.

[0038] When replacing the tail nozzle 1, the front section 2-1 of the test model 2 needs to be removed first. After the replacement is completed, it should be reinstalled in its original position.

[0039] This invention solves the problem of backflow forming inside the model in this type of test, which causes distortion of the flow field in the nozzle area. At the same time, it eliminates the temperature effect of internal airflow on the balance, ensuring measurement accuracy.

[0040] This invention enables the replacement of nozzles of different sizes within the limited space of the model cavity. The device features a compact structure, small size, and simple operation. It achieves reverse jet flow testing within the limited space of the model cavity and has high efficiency.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A device for testing a counterflow jet of a sub-hypersonic wind tunnel tail nozzle, characterized in that: Includes a replaceable tail nozzle (1), a test model (2), an internal vent pipe (3), a tubular venting balance (4), a venting strut (5), an air supply line connector (6), a pin (7), and screws (8); Among them, the ventilation support rod (5) is a cone-shaped cylindrical structure placed horizontally in the axial direction; a through hole is provided at the axis of the ventilation support rod (5); the internal ventilation pipe (3) is a cylindrical structure; the axial end of the internal ventilation pipe (3) is coaxially connected with the small diameter end of the ventilation support rod (5); the tubular ventilation balance (4) is a cylindrical structure; the tubular ventilation balance (4) is fitted on the outer wall of the internal ventilation pipe (3); and the axial end of the tubular ventilation balance (4) is connected with the small diameter end of the ventilation support rod (5); the tubular ventilation balance (4) and The joint of the ventilation support rod (5) is positioned by a pin (7); the replaceable tail nozzle (1) and the axial head end of the internal ventilation pipe (3) are coaxially connected; the test model (2) is coaxially mounted on the outer wall of the replaceable tail nozzle (1), the internal ventilation pipe (3), the tubular ventilation balance (4), and the ventilation support rod (5), and the inner wall of the test model (2) and the outer wall of the tubular ventilation balance (4) are locked by screws (8); the air supply pipe connector (6) is installed at the opening of the large diameter end of the ventilation support rod (5).

2. The apparatus according to claim 1, wherein: The axial tail end of the replaceable tail nozzle (1) and the axial head end of the internal vent pipe (3) are connected by fine thread to ensure connection strength and airtightness; the replaceable tail nozzle (1) does not contact the test model (2).

3. The apparatus of claim 1, wherein: The tubular ventilation balance (4) is a two-component balance, or a three-component balance, or a four-component balance, or a five-component balance.

4. The apparatus of claim 1, wherein: The tubular ventilation balance (4) includes a measuring end (4-1), a measuring element (4-2), and a supporting end (4-3); The measuring end (4-1), measuring element (4-2), and support end (4-3) are all cylindrical structures; the measuring end (4-1), measuring element (4-2), and support end (4-3) are connected in sequence along the axial direction; the outer wall of the measuring end (4-1) is connected to the inner wall of the test model (2); the tail end of the support end (4-3) is connected to the head end of the ventilation support rod (5).

5. The apparatus of claim 4, wherein: The measuring end (4-1) and the measuring element (4-2), as well as the measuring element (4-2) and the support end (4-3), are connected by a thin-walled structure.

6. The apparatus of claim 5, wherein: The thin-walled structure is a cylindrical structure; four protrusions are evenly distributed along the axial direction on the sidewall of the thin-walled structure; the protrusions are cuboid structures and are arranged parallel to the axial direction of the thin-walled structure.

7. The apparatus of claim 1 wherein: The tail end of the internal vent pipe (3) is fitted with the inner hole of the head end of the vent support rod (5) using a cylindrical surface, and is fixed and sealed at the front end of the vent support rod (5) by brazing.

8. The apparatus of claim 7, wherein: The head end of the internal vent pipe (3) is threadedly connected to the rear end of the replaceable tail nozzle (1); the internal vent pipe (3) passes through the center hole of the tubular venting balance (4) and does not contact the tubular venting balance (4).

9. The apparatus of claim 1, wherein: The through hole of the ventilation support rod (5) allows high-pressure gas to pass through; the outer wall of the tail end of the ventilation support rod (5) is fitted with a conical surface and installed on the external wind tunnel support mechanism.

10. The apparatus of claim 1, wherein: The gas supply pipeline joint (6) is installed at the tail end of the ventilation support rod (5) by screw connection, and the gas supply pipeline joint (6) is connected with the external gas supply pipeline.

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