CN117871022A - Method for hanging positive-loading large-scale heavy model in high-speed wind tunnel test section - Google Patents
Method for hanging positive-loading large-scale heavy model in high-speed wind tunnel test section Download PDFInfo
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- CN117871022A CN117871022A CN202410270071.7A CN202410270071A CN117871022A CN 117871022 A CN117871022 A CN 117871022A CN 202410270071 A CN202410270071 A CN 202410270071A CN 117871022 A CN117871022 A CN 117871022A
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- 238000012360 testing method Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000725 suspension Substances 0.000 claims abstract description 51
- 238000009434 installation Methods 0.000 claims abstract description 46
- 210000001015 abdomen Anatomy 0.000 claims abstract description 12
- 238000011900 installation process Methods 0.000 claims abstract description 4
- 239000012927 reference suspension Substances 0.000 claims description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 241001669679 Eleotris Species 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 13
- 230000008602 contraction Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001612 separation test Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides a method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section, wherein the whole installation process is carried out in a wind tunnel; the standard suspension platform is fixed at a non-moving position in the high-speed wind tunnel test section so as to ensure that the installation accuracy of the standard suspension platform is not reduced, the movable lifting platform is used for enabling the large-scale heavy model to be positively installed on the standard suspension platform, and the positive installation means that: the installation mode of the large-scale heavy model is that the abdomen of the large-scale heavy model faces downwards and is consistent with the real flight attitude of the aircraft; the model installation method can effectively realize the installation, disassembly and replacement of the hanging positive-installation large-scale heavy model on the premise of fixing the reference hanging platform, and reduces the installation deviation to the greatest extent.
Description
Technical Field
The invention belongs to the technical field of wind tunnel tests, and particularly relates to a method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section.
Background
Typically, in normal flight attitude, the belly of the aircraft is facing downward and the back is facing upward. For some air-breathing aircraft, the inlet and the engine internal flow passage are near one side of the belly. The tail of the aircraft is provided with a tail nozzle which is an engine outlet jet flow thrust component.
In wind tunnel tests, the aircraft model needs to be installed and placed in a certain range of the center of the jet flow field through a bracket. Neither the belly nor the tail of the aircraft model is suitable for mounting the connecting bracket, but is connected with the wind tunnel test section through the back bracket. If the aircraft model is mounted on a mounting platform at the bottom of the test section by a back support (simply referred to as a "back support"), the aircraft back is directed downward and the belly is directed upward (simply referred to as a "reverse mounting"). If the aircraft model is mounted by means of a back support on a reference suspension platform at the top of the test section (referred to as "suspension" for short), the aircraft is directed with the back upwards and the belly downwards, which is consistent with the normal flight attitude (referred to as "forward-mounted" for short).
The belly air-intake type aircraft model test is usually installed on an installation platform at the bottom of a test section in a back support reverse installation mode, so that the model, an oil supply system and a test system are conveniently installed on one side of the ground. However, this is inconsistent with normal flight attitude. The belly of the aircraft is used as a lifting surface, the upward lifting force is generated in a forward installation state, the aerodynamic force is downward in a reverse installation state and is consistent with the gravity direction of the aircraft, the normal range of the force measuring balance is required to be increased in multiple by superposition of two forces, and larger errors are brought to accurate measurement of the lifting force. In some cases where it is desirable to subtract out gravitational disturbances, downward aerodynamic forces exacerbate gravitational disturbances, which is highly undesirable.
If the aircraft adopts a hanging forward installation mode, the lifting force is opposite to the gravity direction, and the real flight attitude of the aircraft can be simulated. Under certain conditions needing to subtract the gravity interference, the upward lifting force can reduce or even offset the gravity interference, and the development of the test is facilitated. By adopting a hanging normal installation mode, a fixed reference hanging platform is required to be arranged at the top of the wind tunnel test section, and all the model, the force measuring device, the hanging bracket and the like are hung and installed on the reference hanging platform.
Reference suspension platforms generally require immobility. The movable reference suspension platform is difficult and complex, and the mounting position of the movable reference suspension platform is deviated, so that the test is influenced.
In general, compared with a spacious low-speed wind tunnel, the high-speed wind tunnel test section has compact space and even is narrow, and the movable engineering machinery cannot be adopted for auxiliary installation. For small-scale light models, manual carrying mode can be adopted for auxiliary installation. For large-scale heavy models, a crane lifting mode can be adopted for auxiliary installation. However, under the condition that the fixed reference suspension platform is arranged at the top of the wind tunnel test section, the crane hook of the factory building cannot cross the reference suspension platform to block and descend into the test section from the top of the test section, and the aircraft model cannot be hoisted below the reference suspension platform from top to bottom. Therefore, the application requirements of the hanging forward installation cannot be met by a simple crane hoisting mode, and a brand new installation method for hanging the forward installation large-scale heavy model in the high-speed wind tunnel test section needs to be developed.
In the prior art, published Chinese invention application CN114477024A of 2022, 5 and 13 discloses a movable mounting platform for a belly support, a tail support and a back support model, which mainly provides an auxiliary tool for carrying the model in a large wind tunnel and can better solve the problem of movable mounting of the model in various modes in the large wind tunnel. However, the platform is only an auxiliary platform and is only limited to large wind tunnels with sufficient space, the weight of a single piece is limited to 25kg, and a complete solution is still not provided for the problem of hanging installation of a large-scale heavy model for high-speed wind tunnels with compact space.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to solve the problem of the normal installation of the large-scale heavy model in the compact test section of the high-speed wind tunnel, effectively realize the installation, the disassembly and the replacement of the large-scale heavy model in the normal installation on the premise of fixing a reference suspension platform, furthest reduce the installation deviation and provide an installation method for suspending the large-scale heavy model in the test section of the high-speed wind tunnel.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section is characterized in that the whole installation process is carried out in the wind tunnel; the standard suspension platform is fixed at a non-moving position in the high-speed wind tunnel test section so as to ensure that the installation accuracy of the standard suspension platform is not reduced, the movable lifting platform is used for enabling the large-scale heavy model to be positively installed on the standard suspension platform, and the positive installation means that: the installation mode of the large-scale heavy model is that the abdomen of the large-scale heavy model faces downwards and is consistent with the real flight attitude of the aircraft;
the top cover of the test section is positioned at the top of the periphery of the whole test section, the diffuser and the reference suspension platform are positioned below the top cover of the test section in the test section, and the following definitions are defined: the lower part is in the gravity direction;
the upper opening part of the diffuser is positioned at one side of a top contraction section of the diffuser, the contraction section refers to a section with the diameter gradually reduced along the direction of airflow direction, the bottom opening part of the diffuser is positioned at the bottom of the contraction section of the diffuser, and the downward projections of the upper opening part of the diffuser and the bottom opening part of the diffuser are rectangular;
the spray pipe is connected with the test section, the spray pipe is used for spraying experiment incoming flow, the reference suspension platform is positioned between the diffuser and the spray pipe, the T-shaped groove platform is positioned in the test section, one end of the T-shaped groove platform is positioned below an opening part at the bottom of the diffuser, and the other end of the T-shaped groove platform is positioned below the reference suspension platform;
the large scale heavy model is a model with a length of 3 meters or more and a weight of 0.5 ton or more.
Preferably, the method comprises the steps of:
(a1) Opening a top cover of the test section, and disassembling an upper opening part of the diffuser and a bottom opening part of the diffuser in the wind tunnel;
(b1) Operating a traveling crane to hoist the movable lifting platform and the model connecting suspension bracket, and entering a test section from an opening at the upper part of the diffuser;
(c1) A movable lifting platform is operated in the wind tunnel, and a large-scale heavy model is conveyed to the position below a reference suspension platform which is fixed in a high-speed wind tunnel test section;
(d1) The movable lifting platform is operated in the wind tunnel to ascend, and the large-scale heavy model is positively installed on the bottom surface of the reference suspension platform;
(e1) The movable lifting platform is operated in the wind tunnel to descend and retract to the opening at the bottom of the diffuser;
(f1) Operating the travelling crane to hoist the movable lifting platform, and leaving the test section from the upper opening of the diffuser;
(g1) The diffuser bottom opening part and the upper opening part are arranged in the wind tunnel, and the top cover of the test section is closed.
In the step (b 1), a suspension bracket of the aircraft model is hoisted through a hoisting belt of the factory building crane, a sleeper cushion block is arranged on the movable lifting platform, and the suspension bracket is positioned above the aircraft model.
As a preferable mode, the T-shaped groove platform is used for the movable lifting platform and the people to walk;
the reference suspension platform is used for suspending the large-scale heavy model;
the upper opening of the diffuser and the bottom opening of the diffuser, which are left after the upper opening part and the bottom opening part of the diffuser are detached, are vertical channels for lifting the model and the lifting platform to come in and go out of the test section.
Preferably, the diffuser upper opening part and the diffuser bottom opening part are detachably arranged on the diffuser contraction section and are connected with the diffuser through bolts to form a diffuser whole.
Preferably, the opening arc cut out by the upper opening part of the diffuser is up to half of the original arc;
the bottom opening of the diffuser is wider than the T-shaped groove platform and larger than the maximum peripheral outline dimension of the movable lifting platform.
As a preferable mode, lifting lugs and threaded hole sites convenient for installing lifting rings are respectively arranged on the upper opening part of the diffuser and the opening part at the bottom of the diffuser, and the lifting rings are lifted through factory crane.
Preferably, the movable lifting platform comprises a tire at the bottom, wherein the width of the tire is larger than that of the groove of the T-shaped groove platform so as to prevent the inclination and clamping of the movable lifting platform;
the length and the width of the movable lifting platform are smaller than the length and the width of the T-shaped groove platform, and the maximum lifting height ensures that the model connecting suspension bracket can be contacted with the ground of the reference suspension platform, and the rated load capacity is larger than the model weight;
the movable lifting platform is provided with a sleeper cushion block, and the upper end of the sleeper cushion block is provided with jackscrew threads for fine adjustment of flatness of the aircraft model and the connecting suspension bracket;
the T-shaped groove platform is level and smooth, is suitable for horizontally placing and fixing the lifting platform and walking by people.
The method specifically comprises the following steps of:
(a2) Opening a top cover of the test section, and sequentially disassembling and operating a workshop crane to hoist an upper opening part and a bottom opening part of the diffuser to the ground in the workshop outside the test section by using a steel wire rope;
the factory building crane can use a steel wire rope to hoist the upper opening part of the diffuser in the opening state of the top cover of the test section, and can also descend from the upper opening of the diffuser and use the steel wire rope to hoist the bottom opening part of the diffuser;
(b2) The sleeper cushion block is fixed on a workbench surface of the movable lifting platform, an upper opening of the diffuser is taken as an inlet, a fully folded movable lifting platform is hung by using a steel wire rope in a driving manner of the operation factory building, and the advancing direction of the movable lifting platform is opposite to the direction of the spray pipe and is placed on a T-shaped groove platform at the opening at the bottom of the diffuser; the travelling crane of the operation factory building uses a steel wire rope to hoist a model connecting suspension bracket of the aircraft to be positively and flatly placed on a sleeper cushion block on a movable lifting platform, so that the gravity center of a large-scale heavy model is ensured to coincide with the gravity center of the movable lifting platform in the vertical direction, and the front of the model is aligned with the direction of a spray pipe;
(c2) Operating the movable lifting platform to advance the large-scale heavy model connecting suspension bracket to a preset position of the test section, so that the large-scale heavy model precursor stretches into the spray pipe for a preset length;
the preset position refers to the position of the aircraft in the test section according to the test requirement;
(d2) Four supporting legs of the movable lifting platform extend out and are fixed to serve as supporting points, the movable lifting platform is operated to lift the large-scale heavy model connecting suspension bracket to the bottom surface of the reference suspension platform, and after the alignment hole position is finely adjusted, the reference suspension platform is fixedly connected with the suspension bracket by using tool assistance;
the standard suspension platform is fixed at the top of the wind tunnel test section, is a standard platform for large-scale heavy model suspension installation, is horizontal in all directions and symmetrical in both sides, and cannot cross the standard suspension platform to block a crane hook of a factory building to descend into the test section from the top of the test section, so that an aircraft model cannot be hoisted below the standard suspension platform from top to bottom;
(e2) After the model is hung and installed, the supporting legs of the movable lifting platform are retracted, the descending function of the movable lifting platform is started, so that the large-scale heavy model is slowly separated from the sleeper cushion block, the movable lifting platform is operated to descend and fold to the lowest position, and the movable lifting platform moves to the opening at the bottom of the diffuser;
(f2) Operating a workshop crane to hoist the movable lifting platform by using a steel wire rope, and leaving the test section from an upper opening of the diffuser;
(g2) And sequentially operating the workshop crane, hoisting the diffuser bottom opening part and the upper opening part to the corresponding positions of the diffuser by using the steel wire rope, installing and connecting the diffuser and closing the top cover of the test section.
The invention has the application scene that when a certain specific test (such as a casting cover separation test, a model is required to be positively arranged to simulate a downward casting cover in a real state, a conventional reverse-installation mode cannot be used for the test, such as a hanging forward-installation force measurement test, an internal balance is required to be used for testing lifting force, and the lifting force direction is upward only when the model is positively arranged) is required to be positively arranged in a high-speed wind tunnel, the model cannot be directly hoisted by operating a factory crane due to compact test section, and the model cannot be hung and installed manually due to large size and heavy weight, so that the model is required to be moved and lifted by a movable lifting platform.
The beneficial effects of the invention are as follows: the model installation method can effectively realize the installation, disassembly and replacement of the hanging positive-installation large-scale heavy model on the premise of fixing the reference hanging platform, and reduces the installation deviation to the greatest extent.
Drawings
FIG. 1 is a schematic diagram of the system composition of the present invention.
FIGS. 2-a to 2-d are schematic views of the mounting step (a 1) of the present invention. ( Wherein, fig. 2-a: an initial state; fig. 2-b: opening a top cover of the test section; fig. 2-c: disassembling an upper opening part of the diffuser in the wind tunnel; fig. 2-d: the diffuser bottom opening part is disassembled. )
Fig. 3-a to 3-c are schematic views of the mounting step (b 1) of the present invention. ( Wherein, fig. 3-a: operating the travelling crane to hoist the movable lifting platform to enter a test section; fig. 3-b: operating the crane hoisting model to connect the suspension bracket to enter the test section; fig. 3-c: the movable lifting platform is placed on the T-shaped groove platform, and the model connection suspension bracket is placed on the movable lifting platform. )
FIG. 4 is a schematic view of the installation step (c 1) of the present invention.
FIG. 5 is a schematic view of the installation step (d 1) of the present invention.
FIG. 6 is a schematic diagram of the installation step (e 1) of the present invention.
FIG. 7 is a schematic view of the installation step (f 1) of the present invention.
FIG. 8 is a schematic view of the mounting step (g 1) of the present invention.
Wherein: the test bench comprises a diffuser 1, a diffuser upper opening part 2, a test section top cover 3, a reference suspension platform 4, a spray pipe 5, a test section 6, a T-shaped groove platform 7, a diffuser bottom opening part 8, a factory crane 9, a lifting belt 10, a suspension bracket 11, an aircraft model 12, a sleeper cushion block 13 and a movable lifting platform 14.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Example 1
The embodiment provides a method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section, wherein the whole installation process is carried out in a wind tunnel; the reference suspension platform 4 is fixed at a non-moving position in the high-speed wind tunnel test section so as to ensure that the installation accuracy of the reference suspension platform is not reduced, and the movable lifting platform 14 is used for positively installing the large-scale heavy model on the reference suspension platform 4, wherein the positively installing means that: the installation mode of the large-scale heavy model is that the abdomen of the large-scale heavy model faces downwards and is consistent with the real flight attitude of the aircraft;
the test section top cover 3 is located at the top of the periphery of the whole test section 6, and the diffuser 1 and the reference suspension platform 4 are located below the test section top cover 3 in the test section 6, and are defined as follows: the lower part is in the gravity direction;
the diffuser upper opening part 2 is positioned at one side of a top contraction section of the diffuser 1, the contraction section refers to a section with the diameter gradually reduced along the direction of airflow direction, the diffuser bottom opening part 8 is positioned at the bottom of the contraction section of the diffuser 1, and downward projections of the diffuser upper opening part 2 and the diffuser bottom opening part 8 are rectangular;
the spray pipe 5 is connected with the test section 6, the spray pipe 5 is used for spraying experiment incoming flow, the reference suspension platform 4 is positioned between the diffuser 1 and the spray pipe 5, the T-shaped groove platform 7 is positioned in the test section 6, one end of the T-shaped groove platform 7 is positioned below the opening part 8 at the bottom of the diffuser, and the other end of the T-shaped groove platform is positioned below the reference suspension platform 4;
the large scale heavy model is a model with a length of 3 meters or more and a weight of 0.5 ton or more.
The method comprises the following steps:
(a1) 2-a to 2-d, in an initial state (shown in FIG. 2-a), opening the top cover of the test section (shown in FIG. 2-b), removing the diffuser upper opening part (shown in FIG. 2-c) inside the wind tunnel, and removing the diffuser bottom opening part (shown in FIG. 2-d);
(b1) 3-a to 3-c, operating the traveling crane to hoist the movable lifting platform (shown in FIG. 3-a) and the model connecting suspension bracket (shown in FIG. 3-b) to enter the test section, wherein the movable lifting platform is placed on the T-shaped groove platform, and the model connecting suspension bracket is placed on the movable lifting platform (shown in FIG. 3-c);
(c1) As shown in fig. 4, the movable lifting platform is operated in the wind tunnel to convey the large-scale heavy model to the position below the reference suspension platform which is fixed in the high-speed wind tunnel test section;
(d1) As shown in fig. 5, the movable lifting platform is operated to ascend in the wind tunnel, and the large-scale heavy model is positively installed on the bottom surface of the reference suspension platform;
(e1) As shown in fig. 6, the movable lifting platform is operated to descend in the wind tunnel and is retracted to the opening at the bottom of the diffuser;
(f1) As shown in fig. 7, the traveling crane is operated to hoist the movable lifting platform, and the movable lifting platform leaves the test section from the upper opening of the diffuser;
(g1) As shown in fig. 8, the diffuser bottom opening part and the upper opening part are installed in the wind tunnel, and the top cover of the test section is closed.
Further, as shown in fig. 1, in step (b 1), the suspension bracket 11 of the aircraft model 12 is lifted by the lifting belt 10 of the factory building crane 9, the sleeper pad 13 is arranged on the movable lifting platform 14, and the suspension bracket 11 is positioned above the aircraft model 12.
Further, the T-shaped groove platform 7 is used for the movable lifting platform 14 and walking;
the reference suspension platform 4 is used for suspending the large-scale heavy model;
the upper opening and the bottom opening of the diffuser, which are left after the upper opening part 2 and the bottom opening part 8 of the diffuser are detached, are vertical channels for lifting the model and the lifting platform to enter and exit the test section.
Further, the diffuser upper opening part 2 and the diffuser bottom opening part 8 are detachably mounted on the diffuser contraction section and are connected with the diffuser through bolts to form a diffuser whole.
Further, the opening arc cut out by the diffuser upper opening part 2 is up to half of the original arc;
the bottom opening of the diffuser is wider than the T-shaped groove platform 7 and larger than the maximum peripheral outline dimension of the movable lifting platform;
furthermore, lifting lugs and threaded hole sites which are convenient for installing lifting rings are respectively arranged on the upper opening part of the diffuser and the bottom opening part of the diffuser, and the lifting rings are lifted through a factory crane;
further, the movable lifting platform comprises a tire at the bottom, and the width of the tire is larger than that of the groove of the T-shaped groove platform so as to prevent the inclination and clamping of the movable lifting platform;
the length and the width of the movable lifting platform are smaller than the length and the width of the T-shaped groove platform, and the maximum lifting height ensures that the model connecting suspension bracket can be contacted with the ground of the reference suspension platform, and the rated load capacity is larger than the model weight;
the upper end of the sleeper cushion block is provided with jackscrew threads for fine adjustment of flatness of the aircraft model and the connecting suspension bracket;
the T-shaped groove platform is level and smooth and is suitable for horizontally placing and fixing the lifting platform.
The movable lifting platform is provided with a lifting table top, a shearing support, an oil cylinder, an electric liquid pump, a bottom frame, a track, a driving module, tires, supporting legs and an auxiliary walking module. The movable lifting platform in the prior art is a common structure, and is not described herein.
Example 2
The embodiment provides a method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section, which specifically comprises the following steps:
(a2) Opening a top cover of the test section, and sequentially disassembling and operating a workshop crane to hoist an upper opening part and a bottom opening part of the diffuser to the ground in the workshop outside the test section by using a steel wire rope;
the factory building crane can use a steel wire rope to hoist the upper opening part of the diffuser in the opening state of the top cover of the test section, and can also descend from the upper opening of the diffuser and use the steel wire rope to hoist the bottom opening part of the diffuser;
(b2) The sleeper cushion block is fixed on a workbench surface of the movable lifting platform, an upper opening of the diffuser is taken as an inlet, a fully folded movable lifting platform is hung by using a steel wire rope in a driving manner of the operation factory building, and the advancing direction of the movable lifting platform is opposite to the direction of the spray pipe and is placed on a T-shaped groove platform at the opening at the bottom of the diffuser; the travelling crane of the operation factory building uses a steel wire rope to hoist a model connecting suspension bracket of the aircraft to be positively and flatly placed on a sleeper cushion block on a movable lifting platform, so that the gravity center of a large-scale heavy model is ensured to coincide with the gravity center of the movable lifting platform in the vertical direction, and the front of the model is aligned with the direction of a spray pipe;
(c2) Operating the movable lifting platform to advance the large-scale heavy model connecting suspension bracket to a preset position of the test section, so that the large-scale heavy model precursor stretches into the spray pipe for a preset length;
the preset position refers to the position of the aircraft in the test section according to the test requirement;
(d2) Four supporting legs of the movable lifting platform extend out and are fixed to serve as supporting points, the movable lifting platform is operated to lift the large-scale heavy model connecting suspension bracket to the bottom surface of the reference suspension platform, and after the alignment hole position is finely adjusted, the reference suspension platform is fixedly connected with the suspension bracket by using tool assistance;
the standard suspension platform is fixed at the top of the wind tunnel test section, is a standard platform for large-scale heavy model suspension installation, is horizontal in all directions and symmetrical in both sides, and cannot cross the standard suspension platform to block a crane hook of a factory building to descend into the test section from the top of the test section, so that an aircraft model cannot be hoisted below the standard suspension platform from top to bottom;
(e2) After the model is hung and installed, the supporting legs of the movable lifting platform are retracted, the descending function of the movable lifting platform is started, so that the sleeper cushion block is slowly separated from the large-scale heavy model, the movable lifting platform is operated to descend and fold to the lowest position, and the sleeper cushion block is moved to the opening at the bottom of the diffuser;
(f2) Operating a workshop crane to hoist the movable lifting platform by using a steel wire rope, and leaving the test section from an upper opening of the diffuser;
(g2) And sequentially operating the workshop crane, hoisting the diffuser bottom opening part and the upper opening part to the corresponding positions of the diffuser by using the steel wire rope, installing and connecting the diffuser and closing the top cover of the test section.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims of this invention, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the invention disclosed herein.
Claims (9)
1. A method for hanging a positive-loading large-scale heavy model in a high-speed wind tunnel test section is characterized by comprising the following steps of: the whole installation process is carried out in the wind tunnel; the standard suspension platform (4) is fixed at a non-moving position in the high-speed wind tunnel test section so as to ensure that the installation accuracy of the standard suspension platform is not reduced, and the movable lifting platform (14) is used for enabling the large-scale heavy model to be positively installed on the standard suspension platform (4), wherein the positive installation means that: the installation mode of the large-scale heavy model is that the abdomen of the large-scale heavy model faces downwards and is consistent with the real flight attitude of the aircraft;
the top cover (3) of the test section is positioned at the top of the periphery of the whole test section (6), and the diffuser (1) and the reference suspension platform (4) are positioned below the top cover (3) of the test section (6) inside, and are defined: the lower part is in the gravity direction;
the diffuser upper opening part (2) is positioned at one side of a top contraction section of the diffuser (1), the contraction section refers to a section with the diameter gradually reduced along the direction of airflow flow, the diffuser bottom opening part (8) is positioned at the bottom of the contraction section of the diffuser (1), and downward projections of the diffuser upper opening part (2) and the diffuser bottom opening part (8) are rectangular;
the jet pipe (5) is connected with the test section (6), the jet pipe (5) is used for jetting out experimental inflow, the reference suspension platform (4) is positioned between the diffuser (1) and the jet pipe (5), the T-shaped groove platform (7) is positioned in the test section (6), one end of the T-shaped groove platform (7) is positioned below an opening part (8) at the bottom of the diffuser, and the other end of the T-shaped groove platform is positioned below the reference suspension platform (4);
the large scale heavy model is a model with a length of 3 meters or more and a weight of 0.5 ton or more.
2. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, comprising the steps of:
(a1) Opening a top cover of the test section, and disassembling an upper opening part of the diffuser and a bottom opening part of the diffuser in the wind tunnel;
(b1) Operating a traveling crane to hoist the movable lifting platform and the model connecting suspension bracket, and entering a test section from an opening at the upper part of the diffuser;
(c1) A movable lifting platform is operated in the wind tunnel, and a large-scale heavy model is conveyed to the position below a reference suspension platform which is fixed in a high-speed wind tunnel test section;
(d1) The movable lifting platform is operated in the wind tunnel to ascend, and the large-scale heavy model is positively installed on the bottom surface of the reference suspension platform;
(e1) The movable lifting platform is operated in the wind tunnel to descend and retract to the opening at the bottom of the diffuser;
(f1) Operating the travelling crane to hoist the movable lifting platform, and leaving the test section from the upper opening of the diffuser;
(g1) The diffuser bottom opening part and the upper opening part are arranged in the wind tunnel, and the top cover of the test section is closed.
3. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 2, wherein:
in the step (b 1), a hanging bracket (11) of an aircraft model (12) is hung through a hanging belt (10) of a factory building crane (9), a sleeper cushion block (13) is arranged on a movable lifting platform (14), and the hanging bracket (11) is positioned above the aircraft model (12).
4. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: the T-shaped groove platform (7) is used for the movable lifting platform (14) and the people to walk;
the reference suspension platform (4) is used for suspending the large-scale heavy model;
the upper opening of the diffuser and the bottom opening of the diffuser, which are left after the upper opening part (2) and the bottom opening part (8) of the diffuser are detached, are vertical channels for lifting the model and the lifting platform to come in and go out of the test section.
5. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: the diffuser upper opening part (2) and the diffuser bottom opening part (8) are detachably arranged on the diffuser contraction section and are connected with the diffuser through bolts to form a diffuser whole.
6. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: the opening arc cut out by the upper opening part (2) of the diffuser is up to half of the original arc;
the bottom opening of the diffuser (1) is wider than the T-shaped groove platform (7) and larger than the maximum peripheral outline dimension of the movable lifting platform.
7. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: lifting lugs and threaded hole sites convenient for installing lifting rings are respectively arranged on the upper opening part of the diffuser and the opening part at the bottom of the diffuser, and are hoisted through factory crane.
8. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: the movable lifting platform comprises a tire at the bottom, and the width of the tire is larger than that of the groove of the T-shaped groove platform so as to prevent the inclination and clamping of the movable lifting platform;
the length and the width of the movable lifting platform are smaller than the length and the width of the T-shaped groove platform, and the maximum lifting height ensures that the model connecting suspension bracket can be contacted with the ground of the reference suspension platform, and the rated load capacity is larger than the model weight;
a sleeper cushion block (13) is arranged on the movable lifting platform (14), and a jackscrew thread is arranged at the upper end of the sleeper cushion block (13) and is used for fine adjustment of flatness of an aircraft model and a connecting suspension bracket;
the T-shaped groove platform is level and smooth, is suitable for horizontally placing and fixing the lifting platform and walking by people.
9. The method of suspending a positive-fit large scale heavy model in a high speed wind tunnel test section of claim 1, wherein: the method specifically comprises the following steps:
(a2) Opening a top cover of the test section, and sequentially disassembling and operating a workshop crane to hoist an upper opening part and a bottom opening part of the diffuser to the ground in the workshop outside the test section by using a steel wire rope;
the factory building crane can use a steel wire rope to hoist the upper opening part of the diffuser in the opening state of the top cover of the test section, and can also descend from the upper opening of the diffuser and use the steel wire rope to hoist the bottom opening part of the diffuser;
(b2) The sleeper cushion block is fixed on a workbench surface of the movable lifting platform, an upper opening of the diffuser is taken as an inlet, a fully folded movable lifting platform is hung by using a steel wire rope in a driving manner of the operation factory building, and the advancing direction of the movable lifting platform is opposite to the direction of the spray pipe and is placed on a T-shaped groove platform at the opening at the bottom of the diffuser; the travelling crane of the operation factory building uses a steel wire rope to hoist a model connecting suspension bracket of the aircraft to be positively and flatly placed on a sleeper cushion block on a movable lifting platform, so that the gravity center of a large-scale heavy model is ensured to coincide with the gravity center of the movable lifting platform in the vertical direction, and the front of the model is aligned with the direction of a spray pipe;
(c2) Operating the movable lifting platform to advance the large-scale heavy model connecting suspension bracket to a preset position of the test section, so that the large-scale heavy model precursor stretches into the spray pipe for a preset length;
the preset position refers to the position of the aircraft in the test section according to the test requirement;
(d2) Four supporting legs of the movable lifting platform extend out and are fixed to serve as supporting points, the movable lifting platform is operated to lift the large-scale heavy model connecting suspension bracket to the bottom surface of the reference suspension platform, and after the alignment hole position is finely adjusted, the reference suspension platform is fixedly connected with the suspension bracket by using tool assistance;
the standard suspension platform is fixed at the top of the wind tunnel test section, is a standard platform for large-scale heavy model suspension installation, is horizontal in all directions and symmetrical in both sides, and cannot cross the standard suspension platform to block a crane hook of a factory building to descend into the test section from the top of the test section, so that an aircraft model cannot be hoisted below the standard suspension platform from top to bottom;
(e2) After the model is hung and installed, the supporting legs of the movable lifting platform are retracted, the descending function of the movable lifting platform is started, so that the large-scale heavy model is slowly separated from the sleeper cushion block, the movable lifting platform is operated to descend and fold to the lowest position, and the movable lifting platform moves to the opening at the bottom of the diffuser;
(f2) Operating a workshop crane to hoist the movable lifting platform by using a steel wire rope, and leaving the test section from an upper opening of the diffuser;
(g2) And sequentially operating the workshop crane, hoisting the diffuser bottom opening part and the upper opening part to the corresponding positions of the diffuser by using the steel wire rope, installing and connecting the diffuser and closing the top cover of the test section.
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