CN115200827A

CN115200827A - Multi-fan open wind tunnel for simulating variable-angle incoming flow

Info

Publication number: CN115200827A
Application number: CN202210826187.5A
Authority: CN
Inventors: 刘聪; 魏志强; 盛文泰
Original assignee: Civil Aviation University of China
Current assignee: Civil Aviation University of China
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-18

Abstract

The invention discloses a multi-fan open wind tunnel for simulating variable-angle incoming flow, which comprises a three-degree-of-freedom platform, wherein a fan assembling mechanism for simulating the wind tunnel is arranged at the upper end of the three-degree-of-freedom platform, and a slide rail adjusting mechanism for adjusting the air outlet form of the fan assembling mechanism is arranged between the three-degree-of-freedom platform and the fan assembling mechanism. The invention has good use effect, forms complex incoming flow with variable angle through the adjustable three-degree-of-freedom platform, the position of the slide rail and the rotating speed of the fan, thereby simulating the incoming flow of a wind field fitting the real flying environment of an aircraft, and has reliable and simple structure and easy manufacture.

Description

Multi-fan open wind tunnel for simulating variable-angle incoming flow

Technical Field

The invention relates to the technical field of wind tunnels, in particular to a multi-fan open wind tunnel for simulating variable-angle incoming flow.

Background

With the mature development of wind tunnel experiment technology, wind tunnel devices are widely applied to aerodynamic performance and flow field characteristic tests of aircrafts, conventional backflow wind tunnel equipment generally adopts a single large-scale fan as a power source and forms uniform incoming flow in a test section, an ideal uniform wind field environment for the operation of the aircrafts can be simulated to a certain extent, but the simulation capability of the incoming flow of other complex wind fields is limited, a multi-fan array is adopted as a driving active control wind tunnel at present and is an advanced wind field simulation technology, and the multi-fan active control turbulent wind tunnel of the university of Kawasaki in Japan can change the rotating speed and the phase of each fan through electric signals to generate required air flow. The multi-fan wind tunnel of Shanghai university of traffic can simulate the wind speed profile rule of an atmospheric boundary layer, the multi-fan array wind tunnel of Shanghai university can also simulate a pulsating wind field, and the multi-array wind tunnel improves the simulation capability of a non-uniform incoming flow wind field.

However, the structural design ideas of the wind tunnels are basically consistent with those of the conventional wind tunnels, a direct-current test section structure and complex inlet and outlet pipelines are reserved, the volume structure is large and complex, and the manufacturing cost is high; in addition, once the design is built, the fan array is fixed, and the incoming flow method can only flow along the designed channel direction, and the simulation capability of the wind field with vertical or lateral velocity components is lacked.

Disclosure of Invention

The invention aims to provide a multi-fan open wind tunnel for simulating variable-angle incoming flow, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a multi-fan opening wind tunnel simulating variable-angle incoming flow comprises a three-degree-of-freedom platform, wherein a fan assembling mechanism used for simulating the wind tunnel is arranged at the upper end of the three-degree-of-freedom platform, and a sliding rail adjusting mechanism used for adjusting the air outlet form of the fan assembling mechanism is arranged between the three-degree-of-freedom platform and the fan assembling mechanism.

Preferably, the three-degree-of-freedom platform comprises a bottom plate, foundation bolts, air pumps, a lower hinge seat, lower hinge fixing bolts, hinge parts, sleeves, telescopic rods, a top plate, an upper hinge seat and upper hinge fixing bolts, wherein the periphery of the outer side surface of the lower end of the bottom plate is uniformly and fixedly provided with a plurality of foundation bolts, the bottom plate can be fixed on the ground or the end surface of a fixing device through the foundation bolts, the upper end surface of the bottom plate is uniformly and fixedly provided with a plurality of air pumps, the number of the air pumps is three, the air pumps are arranged at the upper end of the bottom plate at intervals of 120 degrees, the lower hinge seat is fixedly arranged at one side of the air pump at the upper end of the bottom plate, the lower hinge fixing bolts are fixedly arranged between the lower hinge seat and the bottom plate, the top plate is provided with a top plate, a plurality of upper hinge seats are uniformly and fixedly arranged on the surface of the lower end of the bottom plate, and upper hinge fixing bolts are fixedly arranged between the upper hinge seats and the top plate, hinge parts are movably arranged in the lower hinge seat and the upper hinge seat, sleeves are arranged on the surfaces of the hinge parts at the lower end, telescopic rods are arranged on the surfaces of the hinge parts at the upper end, the telescopic rods are movably inserted in the sleeves, the hinge parts are movably arranged in the lower hinge seat and the upper hinge seat and are movably connected with the sleeves and the telescopic rods, so that the sleeves and the telescopic rods can rotate along multiple directions, the subsequent telescopic rods can conveniently extend and retract, a top plate can relatively rotate along three coordinate axes of an orthogonal coordinate system in a certain range, the posture of the top plate relative to a bottom plate is changed, the sleeves are hollow, air pumps correspond to the sleeves nearby one by one, corresponding air pumps are communicated with the interiors of the hollow sleeves through pipelines, air can be pumped into the sleeves, and the telescopic rods at the upper ends of the interiors of the sleeves are enabled to be telescopic, either elongating or shortening.

Preferably, slide rail adjustment mechanism includes slide rail, slider, roof upper end outside surface is the fixed a plurality of slide rails that are provided with evenly, slide rail upper end outside surface is provided with the slider through spout activity block, the slide rail passes through the bolt fastening in the roof upper end, the roof upper end is provided with the locating hole that the multiunit can be used to fixed slide rail, when being parallel to each other between fixed slide rail, the fan row of upper end installation can generate the even direct incoming flow that is parallel to each other, when unparallel formation circular arc between the slide rail of installing, the fan row can generate fan-shaped incoming flow, the slider can be in the spacing interior free slip in slide rail both ends, according to the fan row of the different curvature radius of scale formation on the slide rail, when the screw tightening of locking slider surface from the area, can lock the slider.

Preferably, the fan assembling mechanism comprises fan units, fasteners and locking screws, the plurality of fan units are uniformly and fixedly arranged at the upper end of the sliding block, the fasteners are fixedly arranged between the fan units, the locking screws are fixedly arranged between the fan units and the fasteners, the fan units of any number can be quickly and conveniently assembled as required through the fan assembling mechanism, a fan array of a target size is formed, and a wind tunnel test is facilitated.

Preferably, the hinge part at the lower end is movably connected with the lower hinge base through a rotating shaft, the hinge part at the lower end is movably connected with the sleeve through a rotating shaft, the rotating shaft where the sleeve is located is perpendicular to the rotating shaft where the hinge part at the lower end and the lower hinge base are connected, and the specific connection form can be expressed as shown in fig. 1, so that the sleeve can rotate relative to the lower hinge base in multiple directions.

Preferably, the hinge part at the upper end is movably connected with the upper hinge base through a rotating shaft, the hinge part at the upper end is movably connected with the telescopic rod through a rotating shaft, and the rotating shaft where the telescopic rod is located is perpendicular to the rotating shaft where the hinge part at the upper end and the upper hinge base are connected, so that the telescopic rod can rotate in multiple directions relative to the upper hinge base.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can simulate the incoming flow of a plane and a sector through the posture change of the three-degree-of-freedom platform and the relative position of the slide rail, thereby realizing the adjustment of the incoming flow space angle; meanwhile, the speed gradient between airflow layers is simulated by controlling the different rotating speeds of the fan units, the wind tunnel can simulate different types of incoming flows, and compared with the prior art, the wind tunnel can realize a wind field environment more fitting the real flight environment of an aircraft.

2. The invention has simple structure, simulates the wind tunnel by a simple mechanical mechanism, saves complex wind tunnel pipelines, is easy to manufacture, improve, operate and control and is convenient to popularize and use.

Drawings

FIG. 1 is a schematic view of an overall structure of a multi-fan open wind tunnel for simulating an incoming flow with a variable angle according to the present invention;

FIG. 2 is a top view of an overall structure of a multi-fan open wind tunnel simulating variable angle inflow according to the present invention;

FIG. 3 is a view of the horizontal arrangement of the sliding rails of the multi-fan open wind tunnel simulating variable angle incoming flow according to the present invention;

fig. 4 is an overall structural view of a multi-fan open wind tunnel sliding rail adjusting mechanism for simulating variable-angle incoming flow according to the present invention.

In the figure: 1. a fan assembly mechanism; 101. a fan unit; 102. a fastener; 103. locking screws; 2. a three-degree-of-freedom platform; 201. a base plate; 202. a foundation bolt; 203. an air pump; 204. a lower hinge base; 205. a lower hinge fixing bolt; 206. a hinge member; 207. a sleeve; 208. a telescopic rod; 209. a top plate; 210. an upper hinge seat; 211. an upper hinge fixing bolt; 3. a slide rail adjusting mechanism; 301. a slide rail; 302. a slide block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a simulation variable angle comes open wind-tunnel of many fans of flowing, includes three degree of freedom platforms 2, three degree of freedom platforms 2 upper ends are provided with fan equipment mechanism 1 that is used for simulating the wind-tunnel, be provided with slide rail adjustment mechanism 3 that is used for adjusting 1 air-out form of fan equipment mechanism 1 between three degree of freedom platforms 2 and fan equipment mechanism 1.

The three-degree-of-freedom platform 2 comprises a bottom plate 201, anchor bolts 202, air pumps 203, lower hinge seats 204, lower hinge fixing bolts 205, hinge parts 206, sleeves 207, telescopic rods 208, a top plate 209, upper hinge seats 210 and upper hinge fixing bolts 211, wherein the periphery of the outer side surface of the lower end of the bottom plate 201 is uniformly and fixedly provided with the anchor bolts 202, the bottom plate 201 can be fixed on the ground or the end surface of a fixed device through the anchor bolts 202, the upper end surface of the bottom plate 201 is uniformly and fixedly provided with the air pumps 203, the number of the air pumps 203 is three, the air pumps are arranged at the upper end of the bottom plate 201 at intervals of 120 degrees, the upper end of the bottom plate 201 is fixedly provided with the lower hinge seats 204 on one side of the air pumps 203, the lower hinge fixing bolts 205 are fixedly arranged between the lower hinge seats 204 and the bottom plate 201, the upper end of the bottom plate 201 is provided with the top plate 209, and the lower end surface of the bottom plate 201 is uniformly and fixedly provided with the upper hinge seats 210, an upper hinge fixing bolt 211 is fixedly arranged between the upper hinge seat 210 and the top plate 209, hinge parts 206 are movably arranged in the lower hinge seat 204 and the upper hinge seat 210, sleeves 207 are arranged on the surface of the hinge part 206 at the lower end, telescopic rods 208 are arranged on the surface of the hinge part 206 at the upper end, the telescopic rods 208 are movably inserted in the sleeves 207, the hinge parts 206 are movably arranged in the lower hinge seat 204 and the upper hinge seat 210 and are movably connected with the sleeves 207 and the telescopic rods 208, so that the sleeves 207 and the telescopic rods 208 can rotate along multiple directions, the subsequent telescopic rods 208 can conveniently extend and retract, the top plate 209 can relatively rotate along three coordinate axes of an orthogonal coordinate system within a certain range, the posture of the top plate 209 relative to the bottom plate 201 is changed, the sleeves 207 are hollow inside, and the air pumps 203 correspond to the sleeves 207 nearby one by one, the corresponding air pump 203 is communicated with the inside of the hollow sleeve 207 through a pipeline, so that air can be pumped into the sleeve 207, and the telescopic rod 208 at the upper end of the inside of the sleeve 207 is extended or shortened.

Slide rail adjustment mechanism 3 includes slide rail 301, slider 302, roof 209 upper end outside surface is the fixed a plurality of slide rails 301 that are provided with evenly, slide rail 301 upper end outside surface is provided with slider 302 through spout activity block, slide rail 301 passes through the bolt fastening in roof 209 upper end, roof 209 upper end is provided with the locating hole that the multiunit can be used for fixed slide rail 301, when being parallel to each other between fixed slide rail 301, the fan row of upper end installation can generate the even direct incoming flow that is parallel to each other, when the slide rail 301 of installing is unparallel to form the circular arc, the fan row can generate fan-shaped incoming flow, slider 302 can freely slide in slide rail 301 both ends is spacing, form different curvature radius's fan row according to the scale on the slide rail 301, when the screw tightening of locking slider 302 surface from the area, can lock slider 302.

The fan assembling mechanism 1 comprises fan units 101, fasteners 102 and locking screws 103, the upper ends of the sliders 302 are uniformly and fixedly provided with the fan units 101, the fasteners 102 are fixedly arranged between the fan units 101, the locking screws 103 are fixedly arranged between the fan units 101 and the fasteners 102, and any number of fan units 101 can be quickly and conveniently assembled through the fan assembling mechanism 1 as required to form a fan array with a target size, so that a wind tunnel test can be conveniently carried out.

The hinge part 206 at the lower end is movably connected with the lower hinge base 204 through a rotating shaft, the hinge part 206 at the lower end is movably connected with the sleeve 207 through a rotating shaft, the rotating shaft of the sleeve 207 is perpendicular to the rotating shaft of the hinge part 206 at the lower end and the lower hinge base 204, and the connection mode can be expressed as shown in fig. 1, so that the sleeve 207 can rotate relative to the lower hinge base 204 in multiple directions.

The hinge component 206 at the upper end is movably connected with the upper hinge seat 210 through a rotating shaft, the hinge component 206 at the upper end is movably connected with the telescopic rod 208 through a rotating shaft, and the rotating shaft of the telescopic rod 208 is perpendicular to the rotating shaft of the upper hinge component 206 and the upper hinge seat 204, so that the telescopic rod 208 can rotate in multiple directions relative to the upper hinge seat 210.

The working principle is as follows: the testing device is arranged at a fixed ground end or a fixed horizontal end through foundation bolts 202, a fan unit 101 is arranged at the upper end of a three-degree-of-freedom platform 2 through a slide rail 301 and a slide block 302, the fan unit 101 rotates to provide air flow for simulating a wind field so as to be convenient for testing by the testing device, an expected attitude value is input by a computer and is resolved by the attitude, a pressure value required by a sleeve 207 is transmitted to a single chip microcomputer through a data line, the single chip microcomputer is used for directly controlling the air pressure of an air pump 203 and simultaneously used for acquiring a signal of the air pump 203 and sending a rotating speed signal of the fan unit 101 and transmitting the signal back to a computer upper computer to calculate the actual attitude of the fan unit for correction, the lower computer of the single chip microcomputer is connected with the computer upper computer through a serial port, the air pump 203 can be started when the testing device is used, the air pressure generated when the air pump 203 is started pushes three telescopic rods 208 on a bottom plate 201, so that the telescopic rods 208 extend out different lengths in the sleeve 207, the change of the length of the telescopic rod 208 causes the posture of the top plate 209 to change relative to the bottom plate 201, thereby causing the slide rail 301 on the top plate 209 and the fan unit 101 array to generate a corresponding posture angle, thereby generating an incoming flow with a posture angle relative to the ground, when the device is used, the parallelism of the slide rail 301 can be adjusted according to needs, when the fixed slide rails 301 are parallel to each other, the fan array installed at the upper end can generate a uniform and direct incoming flow which is parallel to each other, when the installed slide rails 301 are not parallel to each other to form an arc, the fan array can generate a fan-shaped incoming flow, the sliding block 302 can freely slide in the limit positions at the two ends of the slide rail 301, the fan arrays with different curvature radiuses are formed according to the scales on the slide rail 301, so that different speed gradients are generated by the different speeds of the fan units 101, different posture angles are formed by matching with the inclination of the top plate 209, and the device can simulate a non-uniform incoming flow, the invention relates to a multi-fan open wind tunnel working principle for simulating variable-angle incoming flow, which is characterized in that the use effect of the device is effectively improved under different flow states of cross wind, tangential wind, near-ground boundary layer wind fields and the like.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an open wind-tunnel of many fans of simulation variable angle incoming flow, includes three degree of freedom platforms (2), its characterized in that: the wind tunnel simulation device is characterized in that a fan assembling mechanism (1) used for simulating a wind tunnel is arranged at the upper end of the three-degree-of-freedom platform (2), and a sliding rail adjusting mechanism (3) used for adjusting the air outlet form of the fan assembling mechanism (1) is arranged between the three-degree-of-freedom platform (2) and the fan assembling mechanism (1).

2. The multi-fan open wind tunnel of claim 1, wherein: the three-degree-of-freedom platform (2) comprises a base plate (201), foundation bolts (202), air pumps (203), lower hinge seats (204), lower hinge fixing bolts (205), hinge parts (206), sleeves (207), telescopic rods (208), a top plate (209), upper hinge seats (210) and upper hinge fixing bolts (211), wherein a plurality of foundation bolts (202) are uniformly and fixedly arranged on the periphery of the outer side surface of the lower end of the base plate (201), a plurality of air pumps (203) are uniformly and fixedly arranged on the upper end surface of the base plate (201), the lower hinge seats (204) are fixedly arranged on one side of the air pumps (203) at the upper end of the base plate (201), the lower hinge fixing bolts (205) are fixedly arranged between the lower hinge seats (204) and the base plate (201), the top plate (209) is arranged at the upper end of the base plate (201), a plurality of upper hinge seats (210) are uniformly and fixedly arranged on the lower end surface of the base plate (201), the upper hinge fixing bolts (211) are fixedly arranged between the upper hinge seats (210) and the top plate (209), the lower hinge seats (204) and the inner parts (206) are movably arranged in the upper hinge seats (210), the lower ends of the hinge parts (206), the hinge parts (206) are arranged on the surfaces of the sleeves (206), and the hinge parts (206) are arranged on the surfaces of the hinge parts (206), the telescopic rod (208) is movably inserted into the sleeve (207), and the sleeve (207) is hollow.

3. The multi-fan open wind tunnel of claim 1, wherein: slide rail adjustment mechanism (3) include slide rail (301), slider (302), roof (209) upper end outside surface is even fixed and is provided with a plurality of slide rails (301), slide rail (301) upper end outside surface is provided with slider (302) through spout activity block.

4. The multi-fan open wind tunnel for simulating variable-angle incoming flow according to claim 3, wherein: the fan assembling mechanism (1) comprises fan units (101), fasteners (102) and locking screws (103), wherein the plurality of fan units (101) are uniformly and fixedly arranged at the upper ends of the sliding blocks (302), the fasteners (102) are fixedly arranged between the fan units (101), and the locking screws (103) are fixedly arranged between the fan units (101) and the fasteners (102).

5. The multi-fan open wind tunnel according to claim 2, wherein said wind tunnel simulates a variable angle incoming flow, comprising: the hinge component (206) at the lower end is movably connected with the lower hinge base (204) through a rotating shaft, and the hinge component (206) is movably connected with the sleeve (207) through the rotating shaft.

6. The multi-fan open wind tunnel according to claim 2, wherein said wind tunnel simulates a variable angle incoming flow, comprising: the upper end of the hinge component (206) is movably connected with the upper hinge base (210) through a rotating shaft, and the upper end of the hinge component (206) is movably connected with the telescopic rod (208) through the rotating shaft.