Model support and spacecraft pneumatic heatproof ground test equipment

Abstract

The utility model relates to a model support and spacecraft pneumatic heatproof ground test equipment. The model support comprises a mounting rod, a stand column and a connecting base, the lower end of the stand column is connected with the connecting base, and the upper end is connected with the middle area of the mounting rod in the axial direction. Three annular grooves are formed in the outer side of a rod body of the mounting rod in the axial direction at intervals, a liquid channel set is arranged between every two adjacent annular grooves, every two liquid channel sets are arranged in a mirror image mode in the axial direction, each liquid channel set comprises a semi-annular groove, a plurality of upper liquid channels and a plurality of lower liquid channels, and a plurality of column liquid channels are formed in the circumferential direction of a column body of the stand column at intervals. One end of a column liquid channel of the liquid inlet area is communicated with the liquid inlet channel of the connecting base, the other end of the column liquid channel of the liquid inlet area is communicated with the liquid discharging channel and / or the semi-ring groove, one end of a column liquid channel of the liquid outlet area is communicated with the liquid outlet channel of the connecting base, and the other end of the column liquid channel of the liquid outlet area is communicated with the ring groove located in the middle. The heat resistance of the model bracket is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to spacecraft aerodynamic heat protection ground test equipment technical field especially relates to a model support and spacecraft aerodynamic heat protection ground test equipment. BACKGROUND

[0002] When carrying out ground heat protection test on spacecraft and the like by spacecraft aerodynamic heat protection ground test equipment, the model is sent into the high-temperature flow field by the servo system according to the predetermined program and posture, and shock waves will be generated when the model contacts the high-temperature flow field, the shock waves are airflow with very high energy density, which will cause damage to the servo system, therefore, a model support is usually installed between the servo system and the model to place the servo system in a safe area, but the model support needs to withstand the action of shock waves, in the case of low test heat flow, using ablation-resistant material as the support protective material can solve the problem, but in high heat flow test, there is no ablation-resistant material that can meet the protection needs, therefore, a high-heat-flow-resistant model support needs to be developed to meet the demand of high heat flow test. SUMMARY

[0003] The utility model aims at providing a model support and spacecraft aerodynamic heat protection ground test equipment comprising the same, and improving the heat resistance of the model support.

[0004] To achieve the above-mentioned purpose, in the first aspect, the utility model provides a model support, which comprises a mounting rod, a stand and a connecting seat, the lower end of the stand is connected with the connecting seat, the upper end is connected with the middle region of the mounting rod in the axial direction, and the axial length of the mounting rod is greater than the size of the stand in the same direction.

[0005] The mounting rod comprises a rod body and a rod bushing fitted on the outside of the rod body, three ring grooves are arranged on the outside of the rod body in the axial direction, a liquid channel group is arranged between every two adjacent ring grooves, and two liquid channel groups are arranged in mirror image in the axial direction, each liquid channel group comprises a half ring groove, a plurality of upper liquid channels and a plurality of lower liquid channels, the plurality of upper liquid channels are distributed in the circumferential direction along the upper half of the rod body, and the two ends are respectively communicated with a ring groove, the half ring groove is arranged on the lower half of the rod body and adjacent to the ring groove in the middle, and the plurality of lower liquid channels are arranged on the lower half of the rod body and distributed in the circumferential direction, one end of each lower liquid channel is communicated with the ring groove away from the half ring groove, and the other end is communicated with the half ring groove.

[0006] The connecting seat is provided with an inlet hole and an outlet hole, and an inlet channel and an outlet channel are arranged in the interior, the inlet channel is communicated with the inlet hole, and the outlet channel is communicated with the outlet hole.

[0007] The column includes a column body and a column sleeve fitted on the column body, a plurality of column liquid channels are arranged on the column body in a circumferential direction, the plurality of column liquid channels are divided into two liquid inlet areas and two liquid outlet areas in the circumferential direction, the liquid inlet areas and the liquid outlet areas are alternately arranged, each area includes a plurality of column liquid channels, one end of the column liquid channels in the liquid inlet area is communicated with the liquid inlet channel, and the other end is communicated with the liquid outlet channel and / or the semi-ring groove, one end of the column liquid channels in the liquid outlet area is communicated with the liquid outlet channel, and the other end is communicated with the ring groove located in the middle.

[0008] Optionally, the rod body is provided with a hollow channel in the axial direction, the column body is provided with an internal channel penetrating the column body in the up-down direction, and the connecting seat is provided with a connecting seat channel penetrating the connecting seat in the up-down direction, and two ends of the internal channel are communicated with the hollow channel and the connecting seat channel, respectively.

[0009] Optionally, the internal channel is arranged eccentrically.

[0010] Optionally, the cross section of the column body is a trapezoid, and the upper base and the lower base of the trapezoid are completely rounded.

[0011] Optionally, the cross section of the rod body is a circle, and the diameters of the two ends of the rod body are different.

[0012] Optionally, the liquid inlet hole and the liquid outlet hole are located on the two sides of the column, respectively.

[0013] Optionally, the liquid inlet channel and the liquid outlet channel are arranged in layers in the up-down direction.

[0014] Optionally, the rod body is provided with a flange at each end, two reinforcing rib groups are arranged on the outer side of the rod body in the axial direction at intervals, each reinforcing rib group has an interval between one end and the adjacent flange to form a ring groove, the interval between the two reinforcing rib groups forms another ring groove, the reinforcing rib group includes a plurality of axial reinforcing ribs arranged at intervals in the circumferential direction and a semi-ring reinforcing rib, an upper liquid channel is formed between the adjacent two axial reinforcing ribs located in the upper half, a lower liquid channel is formed between the adjacent two axial reinforcing ribs located in the lower half, the semi-ring reinforcing rib is arranged in the lower half of the rod body and connected with the two axial reinforcing ribs located in the upper half at both ends, and a semi-ring groove is formed between the semi-ring reinforcing rib and the axial reinforcing rib located in the lower half.

[0015] Optionally, the materials of the rod body, the column body and the connecting seat are steel.

[0016] The materials of the rod sleeve and the column sleeve are copper.

[0017] In a second aspect, the utility model also provides a kind of aerospace aerodynamic heat protection ground test equipment, including the model support of any implementation mode in the first aspect.

[0018] The above technical scheme of the utility model has the following advantages:

[0019] The model support provided by this utility model includes a mounting rod, a column, and a connecting seat. The lower end of the column is connected to the connecting seat, and the upper end is connected to the middle region of the mounting rod in the axial direction. The axial length of the mounting rod is greater than the dimension of the column in the same direction. The mounting rod includes a rod body and a rod bushing fitted around the rod body. Three annular grooves are provided axially spaced on the outer side of the rod body. A liquid channel group is provided between two adjacent annular grooves. The two liquid channel groups are mirrored in the axial direction. Each liquid channel group includes a semi-annular groove, multiple upper liquid channels, and multiple lower liquid channels. The column includes a column body and a column bushing fitted around the column body. Multiple column liquid channels are provided circumferentially spaced. The multiple column liquid channels are divided into two liquid inlet areas and two liquid outlet areas in the circumferential direction. The liquid inlet areas and liquid outlet areas are alternately distributed. One end of the column liquid channel in the liquid inlet area is connected to the liquid inlet channel of the connecting seat, and the other end is connected to the lower liquid channel and / or the semi-annular groove. One end of the column liquid channel in the liquid outlet area is connected to the liquid outlet channel of the connecting seat, and the other end is connected to the annular groove located in the middle. Coolant is supplied to the columnar liquid channel in the liquid inlet area through the liquid inlet channel. The coolant flows upward through the columnar liquid channel and then through the semi-annular groove into the liquid outlet channel. It then enters the liquid outlet channel located at the top of the rod through the connected annular groove. Finally, it flows out from the liquid outlet channel after entering the columnar liquid outlet channel in the liquid outlet area through the connected annular groove located in the middle. This cycle of cooling cools the model support and improves its heat resistance. Attached Figure Description

[0020] The accompanying drawings are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual product.

[0021] Figure 1 This is a schematic diagram of the structure of a model support in an embodiment of this utility model;

[0022] Figure 2 yes Figure 1 A front view schematic diagram of the support structure for the model;

[0023] Figure 3 yes Figure 2 Left view of the model support frame;

[0024] Figure 4 yes Figure 3 Schematic diagram of AA section in the middle;

[0025] Figure 5 yes Figure 3 Schematic diagram of the BB cross section in the middle;

[0026] Figure 6 yes Figure 3 Schematic diagram of the CC section in the image;

[0027] Figure 7 yes Figure 3 Schematic diagram of the DD cross section in the middle;

[0028] Figure 8 is a structure schematic view of the model support after removing the rod bushing and the column bushing in the embodiment of the utility model;

[0029] Figure 9 is Figure 8 another angle structure schematic view of the model support after removing the rod bushing and the column bushing.

[0030] In the figure:

[0031] 1: mounting rod;

[0032] 11: rod body;

[0033] 111: first ring groove;

[0034] 112: second ring groove;

[0035] 113: third ring groove;

[0036] 114: liquid channel group;

[0037] 1141: half ring groove;

[0038] 1142: upper liquid channel;

[0039] 1143: lower liquid channel;

[0040] 115: hollow channel;

[0041] 12: rod bushing;

[0042] 2: stand column;

[0043] 21: column body;

[0044] 22: column bushing;

[0045] 23: column liquid channel;

[0046] 24: internal channel;

[0047] 3: connecting seat;

[0048] 31: liquid inlet;

[0049] 32: liquid outlet;

[0050] 33: connecting seat channel;

[0051] 34: communication channel;

[0052] 4: liquid inlet connector;

[0053] 5: liquid outlet connector. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0055] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "left", "right", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as limiting the utility model.

[0056] In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0057] The model support provided by the embodiment is installed in a spacecraft aerodynamic heat protection ground test equipment, a model to be tested is installed on the model support, and the model is sent into a high-temperature flow field by a servo system according to a predetermined program and posture.

[0058] As shown in the drawings, Figures 1-9 The model support provided by the embodiment of the utility model comprises a mounting rod 1, a stand column 2 and a connecting seat 3, the lower end of the stand column 2 is connected with the connecting seat 3, the upper end is connected with the middle region of the mounting rod 1 in the axial direction, that is, the stand column 2 is arranged longitudinally, the mounting rod 1 is arranged laterally, the middle part of the mounting rod 1 is connected and fixed with the upper end of the stand column 2, and the axial length of the mounting rod 1 is greater than the size of the stand column 2 in the same direction, that is, the mounting rod 1 extends out of the outer side of the stand column 2 in the axial direction. As shown in the drawings, Figure 2 The whole model support is in the shape of an I-beam.

[0059] As shown in the drawings, Figure 4 , Figure 8 and Figure 9 The mounting rod 1 comprises a rod body 11 and a rod bushing 12 which is sleeved on the outer side of the rod body 11, three annular grooves are arranged on the outer side of the rod body 11 in the axial direction, and Figure 2 and Figure 9The first ring groove 111, the second ring groove 112 and the third ring groove 113 are arranged from left to right in the shown orientation. A liquid passage group 114 is arranged between each two adjacent ring grooves, i.e. one liquid passage group 114 is arranged between the first ring groove 111 and the second ring groove 112, and one liquid passage group 114 is arranged between the second ring groove 112 and the third ring groove 113. The two liquid passage groups 114 are mirror-imaged in the axial direction of the mounting rod 1.

[0060] The structure of the liquid passage group 114 will be described below with reference to the liquid passage group 114 on the right side of the mounting rod 1. Figure 9 The liquid passage group 114 comprises a half ring groove 1141, a plurality of upper liquid passages 1142 and a plurality of lower liquid passages 1143. The plurality of upper liquid passages 1142 are arranged in a circumferential direction on the upper half of the rod body 11, and the two ends of the upper liquid passages 1142 are in communication with the third ring groove 113. The half ring groove 1141 is arranged on the lower half of the rod body 11 and is adjacent to the second ring groove 112 but not in communication with the second ring groove 112. The plurality of lower liquid passages 1143 are arranged in a circumferential direction on the lower half of the rod body 11, and one end of the lower liquid passages 1143 is in communication with the third ring groove 113, and the other end of the lower liquid passages 1143 is in communication with the half ring groove 1141.

[0061] The liquid passage group 114 comprises a half ring groove 1141, a plurality of upper liquid passages 1142 and a plurality of lower liquid passages 1143. The plurality of upper liquid passages 1142 are arranged in a circumferential direction on the upper half of the rod body 11, and the two ends of the upper liquid passages 1142 are in communication with the third ring groove 113. The half ring groove 1141 is arranged on the lower half of the rod body 11 and is adjacent to the second ring groove 112 but not in communication with the second ring groove 112. The plurality of lower liquid passages 1143 are arranged in a circumferential direction on the lower half of the rod body 11, and one end of the lower liquid passages 1143 is in communication with the third ring groove 113, and the other end of the lower liquid passages 1143 is in communication with the half ring groove 1141. Figure 3 、 Figure 5 and Figure 6 As shown in Figs. 1 and 2, the connecting seat 3 is provided with an inlet hole and an outlet hole and is internally provided with an inlet channel 31 and an outlet channel 32. The inlet channel 31 is in communication with the inlet hole, and the outlet channel 32 is in communication with the outlet hole. In the present embodiment, an inlet connector 4 is arranged at the inlet hole, and an outlet connector 5 is arranged at the outlet hole. The connecting seat 3 can be connected to the spacecraft aerodynamic heat protection ground test equipment in various ways, such as a flange structure, etc.

[0062] As shown in Figs. 1 and 2, the connecting seat 3 is provided with an inlet hole and an outlet hole and is internally provided with an inlet channel 31 and an outlet channel 32. The inlet channel 31 is in communication with the inlet hole, and the outlet channel 32 is in communication with the outlet hole. In the present embodiment, an inlet connector 4 is arranged at the inlet hole, and an outlet connector 5 is arranged at the outlet hole. The connecting seat 3 can be connected to the spacecraft aerodynamic heat protection ground test equipment in various ways, such as a flange structure, etc. Figure 4 Figure 7 As shown in Figs. 1 and 2, the connecting seat 3 is provided with an inlet hole and an outlet hole and is internally provided with an inlet channel 31 and an outlet channel 32. The inlet channel 31 is in communication with the inlet hole, and the outlet channel 32 is in communication with the outlet hole. In the present embodiment, an inlet connector 4 is arranged at the inlet hole, and an outlet connector 5 is arranged at the outlet hole. The connecting seat 3 can be connected to the spacecraft aerodynamic heat protection ground test equipment in various ways, such as a flange structure, etc.

[0063] It should be understood by those skilled in the art that the flow field flows in the axial direction of the mounting rod. In order to maximize the cooling effect, those skilled in the art will generally choose to arrange the region where the cooling liquid is initially introduced (the inlet region) in the region where the flow is encountered, for example, the left side of Fig. 1 (corresponding to the lower side in Fig. 2). Figure 9 Figure 7 It should be understood by those skilled in the art that the flow field flows in the axial direction of the mounting rod. In order to maximize the cooling effect, those skilled in the art will generally choose to arrange the region where the cooling liquid is initially introduced (the inlet region) in the region where the flow is encountered, for example, the left side of Fig. 1 (corresponding to the lower side in Fig. 2).​​

[0064] Referring to Figure 7 In the embodiment, two liquid inlet areas are respectively arranged Figure 7 on the upper side and the lower side of the central column 2 (corresponding Figure 9 to the left side and the right side of the central column), and the liquid outlet areas are arranged on Figure 7 the left side and the right side of the central column.

[0065] In use, the model support is installed in the spacecraft aerodynamic heat protection ground test equipment through the connecting seat, the model is installed at one end of the installation rod, and the cooling liquid is provided to the column liquid passages of the liquid inlet areas through the liquid inlet channels, the cooling liquid passes through the semi-ring grooves along the column liquid passages to the liquid outlet passages, then enters the upper liquid passages located at the upper part of the rod body through the connected ring grooves, then enters the column liquid passages of the liquid outlet areas from the connected and middle ring grooves, and then flows out from the liquid outlet channels (see the flow direction of the cooling liquid indicated by the arrows in Figure 9 ), so as to circulate and cool the model support to improve the heat resistance of the model support.

[0066] It should be noted that the two liquid passage groups 114 are mirror-imaged in the axial direction of the installation rod 1, mainly referring to the mirror-imaged arrangement of the components and arrangement modes of the passages in the liquid passage groups, and not limited to the same size. For example, referring to Figure 8 and Figure 9 In the example in which the diameters of the two ends of the installation rod 1 are different, the components and arrangement modes of the passages of the two liquid passage groups 114 are mirror-imaged, but the sizes are not the same.

[0067] In order to facilitate wiring, in an example, referring to Figures 4-7 , the rod body 11 is provided with a hollow passage 115 in the axial direction, the column body 21 is provided with an internal passage 24 penetrating the column body 21 in the up-down direction, and the connecting seat 3 is provided with a connecting seat passage 33 penetrating the connecting seat 3 in the up-down direction, the two ends of the internal passage 24 are in communication with the hollow passage 115 and the connecting seat passage 33 respectively, and a wiring passage is formed. The rod liner 12 and the rod body 11 are perforated at positions corresponding to the internal passage 24 to communicate with the internal passage 24.

[0068] In order to better protect the internal cable, in an example, referring to Figure 4 , the internal passage 24 is eccentrically arranged, i.e. not located at the center, and in use, the side with a larger thickness faces the flow direction of the flow field.

[0069] In order to reduce the influence on the flow field and improve the rigidity and strength of the central column 2, in an example, referring to 1、 Figure 7 and Figure 8As shown, the cross section of the column 21 is trapezoidal, and the upper base and lower base of the trapezoid are completely rounded, which can minimize the influence on the flow field while providing sufficient strength and rigidity, and better meet the support requirements under the aerodynamic load in the test. In this example, the two liquid inlet areas are respectively located in the completely rounded areas of the column 21. Preferably, the size of the height of the trapezoid is greater than the size of the lower base. More preferably, the size of the height of the trapezoid is 2-5 times the size of the lower base.

[0070] In an example, the small end of the column 21 (the end where the upper base is located) is located on the same side as the small end of the rod body 11.

[0071] In order to maximize the heat exchange performance while ensuring the structural strength and rigidity, in an example, the rod body 11, the column 21 and the connecting seat 3 are made of steel, and the rod liner 12 and the column liner 22 are made of copper. Preferably, the rod liner 12 is welded and fixed with the rod body 11 and the column 2, and the column liner 22 is welded and fixed with the column 21 and the connecting seat 3.

[0072] Referring to Figure 2 and Figure 3 As shown, the cross section of the rod body 11 is circular, and preferably, the diameters of the two ends of the rod body 11 are different, that is, one end is a small end and the other end is a large end, which can respectively match the models with different size installation interfaces, improving the versatility.

[0073] Referring to Figure 3 and Figure 7 As shown, in an example, the liquid inlet hole and the liquid outlet hole are respectively located on both sides of the column 2, so that the overall structure of the model support is more compact.

[0074] Referring to Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the liquid inlet channel 31 and the liquid outlet channel 32 are arranged in layers from top to bottom, which is convenient for layout. In this embodiment, the liquid inlet channel 31 is in the upper layer and the liquid outlet channel 32 is in the lower layer. The connecting seat 3 is also provided with a vertical communication channel 34 for communicating the column liquid channel of the liquid outlet area with the liquid outlet channel 32 located in the lower layer.

[0075] In this embodiment, the annular groove, semi-annular groove, upper liquid channel, and lower liquid channel can be directly machined on the outer surface of the rod 11, or they can be obtained by setting reinforcing ribs at corresponding locations on the outer surface of the rod 11. In one example, a flange is provided at each end of the rod 11, and two sets of reinforcing ribs are axially spaced on the outer side of the rod 11. One end of each set of reinforcing ribs is spaced with the adjacent flange to form an annular groove, and the space between the two sets of reinforcing ribs forms another annular groove. Each set of reinforcing ribs includes multiple axial reinforcing ribs spaced circumferentially and a semi-annular reinforcing rib. An upper liquid channel is formed between two adjacent axial reinforcing ribs in the upper half of the circumference, and a lower liquid channel is formed between two adjacent axial reinforcing ribs in the lower half of the circumference. The semi-annular reinforcing rib is provided in the lower half of the rod, and its two ends are connected to the two axial reinforcing ribs in the upper half of the circumference. A semi-annular groove is formed between the semi-annular reinforcing rib and the axial reinforcing rib in the lower half of the circumference.

[0076] Similarly, the liquid channel 23 can be directly machined on the outer surface of the column 21, or it can be obtained by multiple reinforcing ribs spaced apart on the outer surface of the column, which will not be elaborated here.

[0077] This embodiment also provides a spacecraft aerodynamic heat protection ground test equipment, including any of the model supports described above.

[0078] In summary, the model support in this embodiment has an overall "I" shape, with a model mounting rod at the top, a column in the middle, and a connecting seat at the bottom. The middle part of the mounting rod connects to the column, meaning it is relatively longer than the column, reducing the shock wave intensity borne by the column. Both the mounting rod and the column are covered with cooling channels to ensure that the high heat flux test requirements are met. The cooling channels guide the coolant from the high heat flux zone to the low heat flux zone according to the heat flux it bears, ensuring that the cooling requirements are met. The inlet and outlet channels are integrated inside the connecting flange, making the structure more compact.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of any conflict between the solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0080] Furthermore, without departing from the scope of this utility model, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A model stand, characterized in that: The mounting rod, the column and the connecting seat are connected, the lower end of the column is connected with the connecting seat, the upper end is connected with the middle region of the mounting rod in the axial direction, and the axial length of the mounting rod is greater than the size of the column in the same direction; The mounting rod includes a rod body and a rod bushing fitted outside the rod body, three ring grooves are arranged on the outer side of the rod body in the axial direction, a liquid channel group is arranged between two adjacent ring grooves, two liquid channel groups are arranged in mirror image in the axial direction, each liquid channel group includes a half ring groove, a plurality of upper liquid channels and a plurality of lower liquid channels, a plurality of upper liquid channels are arranged in the circumferential direction on the lower half of the rod body, and two ends are respectively connected with one of the ring grooves, the half ring groove is arranged on the lower half of the rod body and adjacent to the middle ring groove, a plurality of lower liquid channels are arranged on the lower half of the rod body and arranged in the circumferential direction, one end is connected with the ring groove away from the half ring groove, and the other end is connected with the half ring groove; The connecting seat is provided with an inlet hole and an outlet hole, and is provided with an inlet channel and an outlet channel inside, the inlet channel is connected with the inlet hole, and the outlet channel is connected with the outlet hole; The column includes a column body and a column bushing fitted outside the column body, a plurality of column liquid channels are arranged in the circumferential direction of the column body, the plurality of column liquid channels are divided into two inlet regions and two outlet regions in the circumferential direction, the inlet regions and the outlet regions are alternately distributed, each region includes a plurality of column liquid channels, one end of the column liquid channels of the inlet region is connected with the inlet channel, and the other end is connected with the lower liquid channel and / or the half ring groove, one end of the column liquid channels of the outlet region is connected with the outlet channel, and the other end is connected with the middle ring groove.

2. The model holder according to claim 1, characterized in that: The rod body is provided with a hollow channel in the axial direction, the column body is provided with an internal channel penetrating the column body in the up-down direction, and the connecting seat is provided with a connecting seat channel penetrating the connecting seat in the up-down direction, both ends of the internal channel are respectively connected with the hollow channel and the connecting seat channel.

3. The model holder according to claim 2, characterized in that: The internal channel is eccentrically arranged.

4. The model holder of claim 1, wherein: The cross section of the column body is trapezoidal, and the upper base and the lower base of the trapezoid are completely rounded.

5. The model support of claim 1, wherein: The cross section of the rod body is circular, and the diameters of the two ends of the rod body are different.

6. The model support of claim 1, wherein: The inlet hole and the outlet hole are respectively located on both sides of the column.

7. The model support of claim 1, wherein: The inlet channel and the outlet channel are arranged in layers in the up-down direction.

8. The model support of claim 1, wherein: The rod body is provided with a flange at each end, and two groups of reinforcing ribs are arranged axially on the outer side of the rod body. Each group of reinforcing ribs has a ring groove formed between one end of the group and the adjacent flange, and another ring groove is formed between the two groups of reinforcing ribs. Each group of reinforcing ribs comprises a plurality of axially reinforcing ribs arranged circumferentially and a half-ring reinforcing rib. Two adjacent axially reinforcing ribs on the upper half of the circumference form an upper liquid passage, and two adjacent axially reinforcing ribs on the lower half of the circumference form a lower liquid passage. The half-ring reinforcing rib is arranged on the lower half of the circumference and connected to the two axially reinforcing ribs on the upper half. A half-ring groove is formed between the half-ring reinforcing rib and the axially reinforcing ribs on the lower half.

9. The model support of claim 1, wherein: The rod body, the column body and the connecting seat are made of steel. The rod bushing and the column bushing are made of copper.

10. A spacecraft aerodynamic heat shield ground test apparatus, characterized by: A model support as claimed in any one of claims 1 to 9.

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