An integrated throat model support rod for subsonic shroud ablation test

Abstract

The present invention discloses an integrated throat model support rod for subsonic shroud ablation test, including a throat shell, a model connecting block, a connecting tube and a connecting rod. The throat shell is installed on the outside of the model connecting block, and the connecting tube and the connecting rod are concentrically installed at one end of the model connecting block, and the connecting tube is on the outside of the connecting rod. The throat shell, the model connecting block, the connecting tube and the connecting rod are integrated into one by welding, thereby increasing the integration of the device and reducing the heated area. Through the integrated water-cooling structure design between the throat shell, the model connecting block, the connecting tube and the connecting rod, the cooling effect of the device is enhanced, the cooling water inlet and outlet interface is simplified, and the interface is kept away from the high enthalpy airflow, thereby improving the reliability of the device under the high enthalpy airflow state.

Description

Technical Field

[0001] The invention relates to an integrated throat model support rod for a subsonic shroud ablation test, and belongs to the field of aerodynamic thermal ground simulation test devices for aerospace vehicles. Technical Background

[0002] In ground simulation tests, the use of arc-heated subsonic shroud ablation test technology to study the ablation performance of the model surface heat-resistant material is a relatively good technical approach. At present, with the completion and commissioning of high-enthalpy and high-power arc heating equipment, model development units have put forward higher requirements for aerodynamic thermal ground simulation tests. The throat structure used in the existing subsonic shroud ablation test can only adapt to tests with a total airflow enthalpy below 10MJ / kg, and cannot meet the test requirements under conditions with higher total airflow enthalpy. In addition, the test throat and the model support structure are separated from each other, making the test device complex and easy to burn. Therefore, it is necessary to design the throat and model support device used in the test in a new way based on the special test requirements of subsonic shrouds under high enthalpy conditions, increase the integration of the device, reduce the heating area, and thus improve the survivability of the device under high enthalpy airflow conditions. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an integrated throat model support rod suitable for subsonic shroud ablation test, which can be applied to the subsonic shroud ablation test in aerospace aerodynamic thermal protection ground simulation test.

[0004] The technical solution of the present invention is: an integrated throat model support rod for subsonic shroud ablation test, comprising a throat shell, a model connecting block, a connecting tube and a connecting rod, wherein:

[0005] The front end of the model connecting block is used to install the test model, the throat shell is installed on the outside of the model connecting block to form a sonic throat with the test nozzle, the connecting tube and the connecting rod are concentrically installed at the rear end of the model connecting block, and the connecting tube is on the outside of the connecting rod and is shorter than the connecting rod.

[0006] Preferably, the throat housing, the model connecting block, the connecting tube and the connecting rod have an integrated water-cooling structure.

[0007] Preferably, the integrated water cooling structure includes a cooling water inlet channel arranged inside the connecting rod, the channel is connected to the water storage tank arranged in the model connecting block, a gap is left between the outer side of the model connecting block and the throat outer shell, and an annular water tank is arranged on the outer side of the model connecting block, and evenly distributed radial cooling water channels are arranged on both sides of the water tank, wherein the cooling water channel on one side is connected to the water storage tank, and the cooling water channel on the other side is connected to the gap between the connecting cylinder and the connecting rod.

[0008] Preferably, the outlet of the cooling water channel connected to the water storage tank is an inclined surface, and the angle between the inclined surface and the rear end axis of the connecting rod shaft is in the range of 30-60°.

[0009] Preferably, the cross-sectional area of ​​the gap between the connecting tube and the connecting rod is larger than the minimum cross-sectional area of ​​the gap between the outer side of the model connecting block and the throat housing.

[0010] Preferably, the radial cross-sectional area of ​​the annular water groove is not larger than the radial cross-sectional area of ​​the water storage groove, and the radial cross-sectional area of ​​the water storage groove is larger than the radial cross-sectional area of ​​the connecting rod water inlet channel.

[0011] Preferably, the throat shell is made of red copper material and has a barrel-shaped structure with a flange. The flange structure is fixed on the model connecting block and the front edge of the flange is located on the same plane as the corresponding position of the model connecting block, which is used to limit the bottom of the test model installed at the front end. The inner side of the cylindrical structure is rounded at the connection part with the flange structure, and the outer side is chamfered.

[0012] Preferably, the inner diameter of the chamfer is not larger than the minimum bottom circle diameter of all expected test models, the outer diameter needs to ensure the throat area requirement at this position, and the chamfer angle is larger than the semi-cone angle of the test nozzle.

[0013] Preferably, the throat housing is inclined outwardly relative to the axis of the connecting rod, and the inclination angle is smaller than the semi-cone angle of the test nozzle.

[0014] Preferably, the throat housing, the model connecting block, the connecting tube and the connecting rod are integrated into one by welding.

[0015] Beneficial effects of the present invention:

[0016] The throat device and the model support device used in the current subsonic shroud ablation test are separated from each other, and the structure is complex. The heating surface of each device is exposed to the high enthalpy flow field environment. The throat device structure can only adapt to the test with a total airflow enthalpy below 10MJ / kg, and it is easy to burn under high enthalpy test conditions. The present invention integrates the throat and the model connection support device into one, which can effectively reduce the heating area and improve the survivability of the device.

[0017] An integrated water-cooling structure is formed inside the device, and through the rational design of water-cooling channels, the cooling effect of the device at the heat-concentrated parts is enhanced, the overall water flow resistance in the device is reduced, and the device is cooled evenly, while ensuring the cooling efficiency, the required cooling water flow rate is reduced.

[0018] The throat shell is limited to copper material with high thermal conductivity, which can ensure that the structural shape will not change significantly under the long-term high-enthalpy airflow, thereby increasing the overall service life of the device. Its specific shape design can make the high-enthalpy airflow form a stable sonic line only on the surface of the structure, ensuring that the surface of the test model is a stable subsonic airflow, so that the test can be carried out effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Axial cross-section of the strut of the integrated throat model;

[0020] Figure 2 Schematic diagram of cooling water flow direction of support rods in the integrated throat model;

[0021] Figure 3 Schematic diagram of the use of the integrated throat model support rod. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations.

[0023] The present invention provides an integrated throat model support rod for subsonic shroud ablation test, such as Figure 1 As shown, it includes a throat housing 1, a model connecting block 2, a connecting tube 3 and a connecting rod 4, wherein:

[0024] The throat housing 1 is installed on the outside of the model connecting block 2, and the connecting tube 3 and the connecting rod 4 are concentrically installed at one end of the model connecting block 2. The connecting tube 3 is outside the connecting rod 4 and is shorter than the connecting rod 4 for connecting other fixing devices.

[0025] Specifically, Figure 2 , 3 As shown, when in use, the test model is installed on the other side of the model connection block 2. After the cooling water enters from the far end of the connection rod 4, it reaches the bottom end of the model connection block 2 and spreads around, passes through the inside of the throat shell 1 to cool it, and finally flows out from the inside of the connection tube 3. Through the integrated water cooling structure design between the throat shell 1, the model connection block 2, the connection tube 3 and the connection rod 4, the cooling effect of the device is enhanced, the cooling water inlet and outlet interface is simplified, and the survivability of the device is improved.

[0026] The following is a form of an integrated water cooling structure, including a cooling water inlet channel arranged inside the connecting rod, the channel is connected to the water storage tank arranged in the model connecting block, a gap is left between the outer side of the model connecting block and the throat shell, and an annular water tank is arranged on the outer side of the model connecting block, and radial cooling water channels are evenly distributed on both sides of the water tank, wherein the cooling water channel on one side is connected to the water storage tank, and the cooling water channel on the other side is connected to the gap between the connecting tube and the connecting rod. The outlet of the cooling water channel connected to the water storage tank is an inclined surface, and the angle between the inclined surface and the rear end axis of the connecting rod shaft is 45°. The cross-sectional area of ​​the gap between the connecting tube and the connecting rod is larger than the minimum cross-sectional area of ​​the gap between the outer side of the model connecting block and the throat shell. The radial cross-sectional area of ​​the annular water tank is not larger than the radial cross-sectional area of ​​the water storage tank, and the radial cross-sectional area of ​​the water storage tank is larger than the radial cross-sectional area of ​​the connecting rod water inlet channel.

[0027] like Figure 1 , 3 As shown, the throat shell is made of copper material, and its shape is a barrel-shaped structure with a flange. The flange structure is fixed on the model connection block, and the front edge of the flange is located on the same plane as the corresponding position of the model connection block, which is used to limit the bottom of the test model installed at the front end. The inner side of the cylindrical structure and the flange structure are connected at the connection point, and the outer side is chamfered. The inner diameter of the chamfer is not greater than the minimum bottom circle diameter of all expected test models, and the outer diameter must ensure the throat area requirement at this position. The chamfer angle is greater than the semi-cone angle of the test nozzle. The throat shell is tilted outward relative to the axis of the connecting rod, and the inclination angle is less than the semi-cone angle of the test nozzle.

[0028] The throat shell 1, the model connecting block 2, the connecting tube 3 and the connecting rod 4 are integrated into one body by welding, so as to increase the integration degree of the device, reduce the heating area and improve the survivability of the device under the high enthalpy airflow state.

[0029] The description of the components and the experimental verification of the present invention have proved the characteristics of the present invention, which can be used for subsonic shroud ablation test under high enthalpy conditions to ensure the reliability of the device under high enthalpy gas flow conditions. The undisclosed technology of the present invention belongs to the common knowledge of those skilled in the art.

Claims

1. An integrated throat model strut for subsonic shroud ablation test, characterized in that: It includes a throat housing, a model connecting block, a connecting tube and a connecting rod, wherein: The front end of the model connecting block is used to install the test model, the throat shell is installed on the outside of the model connecting block to form a sonic throat with the test nozzle, the connecting tube and the connecting rod are concentrically installed at the rear end of the model connecting block, and the connecting tube is on the outside of the connecting rod and is shorter than the connecting rod.

2. The integrated throat model support rod for subsonic shroud ablation test according to claim 1, characterized in that: The throat shell, the model connecting block, the connecting tube and the connecting rod have an integrated water cooling structure.

3. The integrated throat model support rod for subsonic shroud ablation test according to claim 2, characterized in that: The integrated water cooling structure includes a cooling water inlet channel arranged inside the connecting rod, which is connected to a water storage tank arranged in the model connecting block. A gap is left between the outer side of the model connecting block and the throat shell, and an annular water tank is arranged on the outer side of the model connecting block. Uniformly distributed radial cooling water channels are arranged on both sides of the water tank, wherein the cooling water channel on one side is connected to the water storage tank, and the cooling water channel on the other side is connected to the gap between the connecting cylinder and the connecting rod.

4. The integrated throat model support rod for subsonic shroud ablation test according to claim 3, characterized in that: The outlet of the cooling water channel connected to the water storage tank is an inclined surface, and the angle between the inclined surface and the rear end axis of the connecting rod shaft is in the range of 30-60 degrees.

5. The integrated throat model strut for subsonic shroud ablation test according to claim 3, characterized in that: The cross-sectional area of ​​the gap between the connecting tube and the connecting rod is larger than the minimum cross-sectional area of ​​the gap between the outer side of the model connecting block and the throat shell.

6. The integrated throat model strut for subsonic shroud ablation test according to claim 3, characterized in that: The radial cross-sectional area of ​​the annular water tank is not greater than the radial cross-sectional area of ​​the water storage tank, and the radial cross-sectional area of ​​the water storage tank is greater than the radial cross-sectional area of ​​the connecting rod water inlet channel.

7. The integrated throat model strut for subsonic shroud ablation test according to claim 1, characterized in that: The throat shell is made of red copper material and has a barrel-shaped structure with a flange. The flange structure is fixed on the model connection block and the front edge of the flange is located on the same plane as the corresponding position of the model connection block. It is used to limit the bottom of the test model installed at the front end. The inner side of the cylindrical structure is rounded at the connection position with the flange structure, and the outer side is chamfered.

8. The integrated throat model support rod for subsonic shroud ablation test according to claim 7, characterized in that: The inner diameter of the chamfer is not greater than the minimum bottom circle diameter of all expected test models, the outer diameter needs to ensure the throat area requirement at this position, and the chamfer angle is greater than the semi-cone angle of the test nozzle.

9. The integrated throat model support rod for subsonic shroud ablation test according to claim 7, characterized in that: The throat housing is inclined outwardly relative to the axis of the connecting rod, and the inclination angle is smaller than the semi-cone angle of the test nozzle.

10. The integrated throat model strut for subsonic shroud ablation test according to claim 1, characterized in that The throat shell, the model connecting block, the connecting tube and the connecting rod are integrated into one body by welding.

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