Helicopter flight principle teaching demonstration wind tunnel

Abstract

The utility model relates to the technical field of helicopter wind tunnel experiments, in particular to a helicopter flight principle teaching demonstration wind tunnel which comprises a vertical flow field demonstration device and a horizontal flow field demonstration device, and wind power of the vertical flow field demonstration device and the horizontal flow field demonstration device is provided by the same fan. In the vertical flow field demonstration device, the air inlet end of a fan is connected with a transparent observation cylinder with a vertical axis through an air pipe, and an air inlet grille is arranged corresponding to the bottom end of the transparent observation cylinder; in the horizontal flow field demonstration device, the air outlet end of a fan is connected with a horizontal table through an air pipe, a transparent observation cylinder is arranged between the air pipe and the horizontal table, and a ventilation grille is arranged corresponding to the air inlet end of the transparent observation cylinder. And damping pipes are arranged at the air inlet end and the air outlet end of the fan. The helicopter flight principle teaching demonstration device is reasonable in structure, a horizontal wind field and a vertical wind field can be achieved through one fan, the effect of saving energy consumption is achieved, the stability of the horizontal flow field and the vertical flow field is high, and helicopter flight principle teaching demonstration is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of helicopter wind tunnel experimental technology, specifically to a wind tunnel for teaching and demonstrating the principles of helicopter flight. Background Technology

[0002] Low-speed wind tunnel testing is an important method for studying the flight performance and aerodynamic characteristics of helicopters. During the test, by measuring motion deformation parameters such as flapping, flaring, and torsional deformation of the helicopter rotor blades, crucial parameter data can be provided for the structural design and aerodynamic characteristic analysis of the rotor system.

[0003] In low-speed wind tunnel tests, both horizontal and vertical flow fields are typically involved in the flight testing of helicopters. When setting up test facilities for these horizontal and vertical flow fields, attention must be paid to the formation of the flow fields, their stability, and observation during the helicopter tests. Existing test equipment usually only supports either horizontal or vertical flow fields, and each type of equipment requires a wind power source, resulting in high energy consumption. Therefore, this paper proposes to develop an energy-efficient wind tunnel that can simultaneously demonstrate both horizontal and vertical flow fields for teaching helicopter flight principles. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the above-mentioned technology and provide a wind tunnel for teaching and demonstrating the principles of helicopter flight.

[0005] A wind tunnel for teaching and demonstrating helicopter flight principles includes a vertical DC field demonstration device and a horizontal flow field demonstration device, wherein the wind power for the vertical DC field demonstration device and the horizontal flow field demonstration device is provided by the same wind turbine;

[0006] In the vertical DC field demonstration device, the air inlet of the fan is connected to a transparent observation tube with a vertical axis through a duct. The bottom of the transparent observation tube is provided with an air inlet grille for stabilizing the airflow field.

[0007] In the horizontal flow field demonstration device, the air outlet of the fan is connected to a water platform through an air duct. A transparent observation tube is provided between the air duct and the water platform. The air inlet of the transparent observation tube in the horizontal flow field demonstration device is provided with a ventilation grille to stabilize the airflow field.

[0008] Furthermore, shock-absorbing pipes are provided between the air inlet end of the fan and the corresponding air duct, and between the air outlet end of the fan and the corresponding air duct.

[0009] Furthermore, in the vertical DC field demonstration device, the air inlet of the fan is circular, the air duct is cylindrical, and the corresponding transparent observation tube and shock-absorbing tube are cylindrical.

[0010] In the horizontal flow field demonstration device, the air outlet of the fan is rectangular, the air duct is set in a square column shape, and the corresponding transparent observation tube and shock-absorbing tube are square columns.

[0011] Furthermore, in the horizontal flow field demonstration device, a transparent observation tube is also installed between the air duct and the water platform.

[0012] Furthermore, in the vertical DC field demonstration device, the bottom end of the transparent observation tube is connected to the air intake grille via an electric cylinder, and support columns are provided around the transparent observation tube.

[0013] Furthermore, a sealing ring is provided around the top periphery of the air intake grille and around the bottom periphery of the transparent observation tube.

[0014] Furthermore, both the ductwork in the vertical DC field demonstration device and the ductwork in the horizontal flow field demonstration device are equipped with support frames.

[0015] Advantages of this utility model: This utility model has a reasonable structure. It can realize both horizontal and vertical wind fields with one fan, which can save energy consumption. The fan inlet is used to simulate the vertical upward wind field, and the fan outlet is used to simulate the horizontal flow field.

[0016] Both the air inlet and outlet of the fan are equipped with vibration damping pipes, which can effectively reduce the impact of fan vibration on equipment stability;

[0017] In the vertical flow field, an air intake grille is installed at the bottom of the cylindrical transparent observation tube, and in the horizontal flow field, a ventilation grille is installed at the air intake end of the square columnar transparent observation tube. Both can contribute to the stability of the corresponding flow field.

[0018] In the vertical flow field, a device for controlling the up-and-down movement of the air intake grille is installed at the bottom of the transparent observation tube to facilitate the placement of the helicopter. At the same time, the sealing design between the bottom of the transparent observation tube and the air intake grille avoids the problem of gaps between the bottom of the transparent observation tube and the air intake grille, which could allow air to enter through gaps and disturb the vertical flow field. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a wind tunnel for teaching and demonstrating the flight principles of a helicopter, according to this utility model.

[0020] Figure 2 This is a schematic diagram of the vertical wind field transparent observation tube and air intake grille of a wind tunnel for teaching and demonstrating the flight principle of a helicopter, according to this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of a transparent observation tube and ventilation grille for a wind tunnel for teaching and demonstrating the principles of helicopter flight.

[0022] As shown in the figure: 1. Fan; 2. Air duct; 3. Transparent observation tube; 4. Air intake grille; 5. Water platform; 6. Ventilation grille; 7. Shock absorber tube; 8. Electric cylinder; 9. Support column; 10. Sealing ring. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of the embodiments of this utility model, if a feature is referred to as "setting", "fixing", "connecting", or "installing" on another feature, it can be set, fixed, or connected directly to the other feature, or it can be set, fixed, connected, or installed indirectly on the other feature.

[0026] In the description of the embodiments of this utility model, the term "several" means one or more, and the term "multiple" means two or more. The terms "greater than," "less than," and "exceeding" should be understood as excluding the stated number, while the terms "above," "below," and "within" should be understood as including the stated number. The terms "first" and "second" should be understood as distinguishing technical features and not as indicating or implying relative importance, the number of indicated technical features, or the order of the indicated technical features.

[0027] A wind tunnel for teaching and demonstrating the principles of helicopter flight includes a vertical DC field demonstration device and a horizontal flow field demonstration device, wherein the wind power for the vertical DC field demonstration device and the horizontal flow field demonstration device is provided by the same fan 1.

[0028] In the vertical DC field demonstration device, the air inlet end of the fan 1 is connected to a transparent observation tube 3 with a vertical axis through the air duct 2. The bottom end of the transparent observation tube 3 is provided with an air inlet grille 4 for stabilizing the airflow field.

[0029] In the horizontal flow field demonstration device, the air outlet of the fan 1 is connected to the water platform 5 through the air duct 2. A transparent observation tube 3 is provided between the air duct 2 and the water platform 5. The air inlet of the transparent observation tube 3 in the horizontal flow field demonstration device is provided with a ventilation grille 6 to stabilize the airflow field.

[0030] In a preferred embodiment of this invention, a damping pipe 7 is provided between the air inlet end of the fan 1 and the corresponding air duct 2, and between the air outlet end of the fan 1 and the corresponding air duct 2, so as to achieve a damping effect and reduce the impact of fan vibration on the wind field.

[0031] In a preferred embodiment of this invention, in the vertical DC field demonstration device, the air inlet of the fan 1 is circular, the air duct 2 is cylindrical, and the corresponding transparent observation tube 3 and shock-absorbing tube 7 are cylindrical.

[0032] In the horizontal flow field demonstration device, the air outlet of the fan 1 is rectangular, the air duct 2 is set in a square column shape, and the corresponding transparent observation tube 3 and shock-absorbing tube 7 are square columns.

[0033] As a preferred embodiment of this invention, a transparent observation tube 3 is also provided between the air duct 2 and the water platform 5 in the horizontal flow field demonstration device to facilitate observation of the helicopter's state changes.

[0034] In a preferred embodiment of this invention, in the vertical DC field demonstration device, the bottom end of the transparent observation tube 3 is connected to the air intake grille 4 via an electric cylinder 8, and the transparent observation tube 3 is provided with support columns 9 around its perimeter. The electric cylinder controls the opening and closing of the air intake grille.

[0035] In a preferred embodiment of this invention, a sealing ring 10 is provided around the top periphery of the air intake grille 4 and around the bottom periphery of the transparent observation tube 3. The sealing ring ensures the sealing between the corresponding transparent observation tube 3 and the air intake grille 4.

[0036] As a preferred embodiment of this invention, the ducts in the vertical DC field demonstration device and the ducts in the horizontal flow field demonstration device are equipped with support frames, which are not shown in the attached drawings and mainly serve a supporting function.

[0037] Example

[0038] Flow rate of fan 1: 60000 kg / h; Total pressure: 3 kPa; Shanghai WALKER fan can be used, equipped with Beijing Zhongke Feiya brand frequency converter to control the air volume of fan 1. The specifications of the frequency converter are rated capacity: 99 kVA, frequency range: 0~50Hz.

[0039] In the vertical DC field, the air duct 2 and the transparent observation tube 3 are circular in design, and the air inlet grille 4 is grille-type and located at the bottom air inlet of the transparent observation tube 3. The inner diameter of the cross-section of the transparent observation tube 3 is φ0.8m.

[0040] In the horizontal flow field, the duct 2 and the transparent observation tube 3 are designed in a square column shape, and the ventilation grille 6 is set at the air inlet end of the corresponding transparent observation tube 3. The cross-sectional rectangular dimensions of the transparent observation tube 3 are 1.2m wide and 0.8m high.

[0041] During the experiment, it was conducted in an open-loop experimental site at normal temperature and pressure. By setting the size and the fan speed, the wind speed of the transparent observation tube 3 entering the horizontal flow field and the wind speed of the transparent observation tube 3 entering the vertical flow field were both controlled at 0-15 m / s.

[0042] When the unmanned helicopter is placed in the vertical flow field, the air intake grille 4 is moved downward by the electric cylinder 8. The unmanned helicopter is placed on the upper side of the air intake grille 4. Then, the air intake grille 4 is lifted upward by the electric cylinder 8. Combined with the sealing ring 10, the corresponding transparent observation tube 3 and the air intake grille 4 are sealed and fitted together. The flight test of the unmanned helicopter in the vertical flow field of the wind in the transparent observation tube 3 can be carried out.

[0043] Simultaneously, the same unmanned helicopter can be placed in a horizontal flow field device, on a water platform, or inside a transparent observation tube to conduct horizontal flow flight experiments.

[0044] All contents not described in detail in this specification are existing technologies known to those skilled in the art. For example, the motors and frequency converters in this case are all in line with the requirements of this case.

[0045] Those skilled in the art can connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art and will not be described in the electrical control section.

[0046] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A teaching demonstration wind tunnel for the principles of helicopter flight, characterised in that: The vertical flow field demonstration device and the horizontal flow field demonstration device are connected by the same fan (1); In the vertical flow field demonstration device, the air inlet end of the fan (1) is connected with an axis vertical transparent observation cylinder (3) through the air pipe (2), and the bottom end of the transparent observation cylinder (3) is provided with an air inlet grille (4) for stabilizing the air flow field; In the horizontal flow field demonstration device, the air outlet end of the fan (1) is connected with a water platform (5) through the air pipe (2), and the transparent observation cylinder (3) is arranged between the air pipe (2) and the water platform (5), and the air inlet end of the transparent observation cylinder (3) in the horizontal flow field demonstration device is provided with a ventilation grille (6) for stabilizing the air flow field.

2. A teaching demonstration wind tunnel for teaching the principles of helicopter flight according to claim 1, characterised in that: The air inlet end of the fan (1) and the corresponding air pipe (2) and the air outlet end of the fan (1) and the corresponding air pipe (2) are provided with a damping pipe (7).

3. A teaching demonstration wind tunnel for teaching the principles of helicopter flight according to claim 1, wherein: In the vertical flow field demonstration device, the air inlet of the fan (1) is circular, the air pipe (2) is cylindrical, and the corresponding transparent observation cylinder (3) and damping pipe (7) are cylindrical. In the horizontal flow field demonstration device, the air outlet of the fan (1) is rectangular, the air pipe (2) is square column, and the corresponding transparent observation cylinder (3) and damping pipe (7) are square column.

4. A teaching demonstration wind tunnel for teaching the principles of helicopter flight according to claim 1, characterized in that: In the horizontal flow field demonstration device, the transparent observation cylinder (3) is also arranged between the air pipe (2) and the water platform (5).

5. A teaching demonstration wind tunnel for teaching the principles of helicopter flight according to claim 1, wherein: In the vertical flow field demonstration device, the bottom end of the transparent observation cylinder (3) is connected with the air inlet grille (4) through the electric cylinder (8), and the periphery of the transparent observation cylinder (3) is provided with a support column (9).

6. A teaching demonstration wind tunnel for the principles of helicopter flight according to claim 5 wherein: The top end periphery of the air inlet grille (4) and the bottom end periphery of the transparent observation cylinder (3) are provided with a sealing ring (10).

7. A teaching demonstration wind tunnel for teaching the principles of helicopter flight according to claim 1, wherein: The air pipe in the vertical flow field demonstration device and the air pipe in the horizontal flow field demonstration device are provided with a support frame.

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