Propeller test supporting device suitable for vertical wind tunnel

Abstract

The utility model belongs to the technical field of wind tunnel test force measurement, and particularly relates to a propeller test supporting device suitable for a vertical wind tunnel. The propeller test supporting device comprises a rectifying device, a force measuring device and a side support, the rectifying device comprises a rectifying head and a rectifying cover; the force measuring device comprises a rear taper sleeve, a balance, a front taper sleeve, a motor sleeve, a servo motor and a photoelectric sensor; the rear taper sleeve, the balance, the front taper sleeve, the motor sleeve, the servo motor and the propeller are fixedly connected in sequence; each side support comprises a side supporting rod and a supporting plate. The device can realize the function of carrying out a propeller test in a vertical wind tunnel, the rectifying device adopts a square cross section, the influence of rectifying equipment on the aerodynamic performance of a propeller is reduced, and the sections of the supporting device are simple to connect and convenient to disassemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind tunnel test force measurement, and in particular relates to a propeller test support device suitable for a vertical wind tunnel. Background Art

[0002] Propellers, as a powerplant with a simple structure, low fuel consumption, mature technology, and low manufacturing and maintenance costs, have been widely adopted in cruise missiles, such as the US Switchblade. The propeller's aerodynamic performance is crucial for the selection of the drive motor and the overall design of the missile. Currently, wind tunnel testing remains the best way to accurately obtain propeller performance data. The propeller is secured in the wind tunnel by a support device, where a servo motor controls the propeller's speed. A balance is used to measure the propeller's aerodynamic characteristics at different wind speeds and rotational speeds, thereby obtaining a complete picture of the propeller's aerodynamic performance.

[0003] Existing propeller support systems are mostly based on horizontal wind tunnels, where the support's gravity direction is perpendicular to the incoming flow. In vertical wind tunnels, however, the gravity direction and incoming flow are parallel, making conventional propeller support systems unsuitable for vertical wind tunnels. Furthermore, due to the inherent requirements of cruise missiles, propellers are smaller in size, thrust, and torque than conventional propellers. Under conventional testing conditions, the diameter of the servo motor and dynamometer after rectification is much larger than the missile's diameter, resulting in significant interference between the support structure and the propeller, leading to inaccurate test results. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is: how to solve the technical problems that there is no propeller test support device suitable for vertical wind tunnels, and that the equipment needs to be disassembled simply and quickly.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a propeller test support device suitable for a vertical wind tunnel, the propeller test support device comprising: a straightening device, a force measuring device and a side support;

[0008] The fairing device includes a fairing head and a fairing cover;

[0009] The force measuring device includes a rear cone sleeve, a balance, a front cone sleeve, a motor sleeve, a servo motor, and a photoelectric sensor; the rear cone sleeve, the balance, the front cone sleeve, the motor sleeve, the servo motor, and the propeller are fixedly connected in sequence;

[0010] The side supports include side support rods and support plates.

[0011] Among them, the upper inner surface of the rear cone sleeve has a 1:10 inner cone surface, which cooperates with the 1:10 outer cone surface below the balance, and is tightened and fixed on the side using an inclined wedge; the lower outer surface of the rear cone sleeve is a 1:10 outer cone surface, and the surface has a conical keyway, which cooperates with the 1:10 inner surface of the left end of the side support rod, and the two are positioned by a key.

[0012] There is a cylindrical outer surface below the rear cone sleeve, and a cylindrical keyway is provided on the surface, which is positioned and matched with the circular hole in the middle of the support plate, and the two are positioned by a key.

[0013] Among them, the bottom of the rear cone sleeve is a section of external thread. During assembly, the corresponding nut is tightened from bottom to top along the external thread to firmly fix the support plate on the lower surface of the left end of the side support rod.

[0014] The cross-sectional shape of the rectifying head changes from square to circular from top to bottom, so that the airflow flows evenly through the rectifying head without causing large separation; the rectifying head is fixed under the support plate by screws.

[0015] Among them, the fairing is connected to the bottom of the support plate by screws; the fairing has a corresponding hole in the lower right corner, and the support plate also has a corresponding hole on the right side. After the two are connected, the left end of the side support rod can be penetrated and the rear cone sleeve can be fixed.

[0016] Among them, the lower end of the middle part of the front cone sleeve has a standard 1:5 inner cone surface, which functions to cooperate with the 1:5 outer surface of the balance head, and the two are positioned and matched by a key; preferably, the cone surface fit meets the national military standard force measurement requirements, that is, the cone surface contact area should be no less than 85%.

[0017] Among them, the upper end of the middle part of the front cone sleeve is an M12 standard internal thread. During installation, the M8 bolt is passed through the threaded hole and into the M8 internal threaded hole on the end face of the balance head. It is rotated and tightened to achieve a tight fit between the balance head and the conical surface of the front cone sleeve, ensuring that all the force on the upper end mechanism is transmitted to the head of the balance 11, and the measurement data is accurate and reliable.

[0018] The servo motor is positioned by a circular ring with a diameter of 60 mm on the upper end surface and fixed inside the motor sleeve using screws and nuts; accordingly, corresponding holes are opened on the four sides of the upper part of the motor sleeve to enable convenient and quick disassembly and assembly of the servo motor;

[0019] Since the cross section of the servo motor is square, the cross section of the motor sleeve is also set to be square, thereby reducing the influence of the motor sleeve on the aerodynamic characteristics of the propeller behind it.

[0020] The motor sleeve has a circle of through holes at the lower end, and the front cone sleeve has threaded holes at the corresponding position on the upper end. The two are tightened and connected by a circle of screws. Square holes are opened on three sides of the motor sleeve to reduce the weight of the system. Another side is slotted straight through to the rear end to facilitate the insertion of the protruding terminal of the servo motor.

[0021] The photoelectric sensor is fixed on the upper right side of the motor sleeve and measures the average rotation speed of the propeller through the basic principle of laser counting.

[0022] (3) Beneficial effects

[0023] The utility model proposes a propeller test support device suitable for a vertical wind tunnel, which can realize the function of carrying out propeller tests in a vertical wind tunnel. The straightening device adopts a square cross-section, which reduces the influence of the straightening equipment on the aerodynamic performance of the propeller, and the various sections of the support device are simple to connect and easy to disassemble.

[0024] Compared with the prior art, the propeller test support device for a vertical wind tunnel of the present invention has at least the following beneficial effects:

[0025] (1) The utility model adopts a support structure with a square cross-section. For a square servo motor, the cross-sectional area of the support device is reduced, thereby reducing the influence of the support device on the aerodynamic data of the propeller.

[0026] (2) The rectifier head of the utility model is optimized and adjusted to address the special situation of the square cross-section, and a square-to-round shape design is developed, thereby reducing the irregular characteristics of the square cross-section on the airflow.

[0027] (3) The front cone sleeve and the motor sleeve of the utility model are provided with holes and grooves at unimportant positions on the basis of ensuring rigidity, thereby reducing weight and reducing the load-bearing capacity of the balance.

[0028] (4) The fairing head, support plate, fairing, front cone sleeve, motor sleeve, servo motor, etc. of the utility model are all connected by bolts and screws, and the connection is stable and reliable and easy to disassemble.

[0029] (5) In the present invention, the real-time rotation speed of the propeller is measured by a photoelectric sensor, and the propeller rotation speed data with high accuracy can be obtained through data processing and other methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the support device of the utility model.

[0031] Figure 2 Schematic diagram of the internal structure of the fairing of the present invention.

[0032] Figure 3Schematic diagram of the structure of the middle and rear cone sleeve of the utility model.

[0033] Figure 4 Schematic diagram of the front cone sleeve structure of the utility model.

[0034] Among them, 1-side support rod; 2-fairing head; 3-support plate; 4-fairing; 5-front cone sleeve; 6-servo motor; 7-motor sleeve; 8-photoelectric sensor; 9-propeller; 10-rear cone sleeve; 11-balance; 12-nut; 101-inner cone surface; 102-outer cone surface; 103-conical keyway; 104-cylindrical keyway; 105-external thread. DETAILED DESCRIPTION

[0035] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In order to solve the above technical problems, the utility model provides a propeller test support device suitable for a vertical wind tunnel, the propeller test support device comprising: a straightening device, a force measuring device and a side support;

[0037] The fairing device includes a fairing head and a fairing cover;

[0038] The force measuring device includes a rear cone sleeve, a balance, a front cone sleeve, a motor sleeve, a servo motor, and a photoelectric sensor; the rear cone sleeve, the balance, the front cone sleeve, the motor sleeve, the servo motor, and the propeller are fixedly connected in sequence;

[0039] The side supports include side support rods and support plates.

[0040] Among them, the upper inner surface of the rear cone sleeve has a 1:10 inner cone surface, which cooperates with the 1:10 outer cone surface below the balance, and is tightened and fixed on the side using an inclined wedge; the lower outer surface of the rear cone sleeve is a 1:10 outer cone surface, and the surface has a conical keyway, which cooperates with the 1:10 inner surface of the left end of the side support rod, and the two are positioned by a key.

[0041] There is a cylindrical outer surface below the rear cone sleeve, and a cylindrical keyway is provided on the surface, which is positioned and matched with the circular hole in the middle of the support plate, and the two are positioned by a key.

[0042] Among them, the bottom of the rear cone sleeve is a section of external thread. During assembly, the corresponding nut is tightened from bottom to top along the external thread to firmly fix the support plate on the lower surface of the left end of the side support rod.

[0043] The cross-sectional shape of the rectifying head changes from square to circular from top to bottom, so that the airflow flows evenly through the rectifying head without causing large separation; the rectifying head is fixed under the support plate by screws.

[0044] Among them, the fairing is connected to the bottom of the support plate by screws; the fairing has a corresponding hole in the lower right corner, and the support plate also has a corresponding hole on the right side. After the two are connected, the left end of the side support rod can be penetrated and the rear cone sleeve can be fixed.

[0045] Among them, the lower end of the middle part of the front cone sleeve has a standard 1:5 inner cone surface, which functions to cooperate with the 1:5 outer surface of the balance head, and the two are positioned and matched by a key; preferably, the cone surface fit meets the national military standard force measurement requirements, that is, the cone surface contact area should be no less than 85%.

[0046] Among them, the upper end of the middle part of the front cone sleeve is an M12 standard internal thread. During installation, the M8 bolt is passed through the threaded hole and into the M8 internal threaded hole on the end face of the balance head. It is rotated and tightened to achieve a tight fit between the balance head and the conical surface of the front cone sleeve, ensuring that all the force on the upper end mechanism is transmitted to the head of the balance 11, and the measurement data is accurate and reliable.

[0047] The servo motor is positioned by a circular ring with a diameter of 60 mm on the upper end surface and fixed inside the motor sleeve using screws and nuts; accordingly, corresponding holes are opened on the four sides of the upper part of the motor sleeve to enable convenient and quick disassembly and assembly of the servo motor;

[0048] Since the cross section of the servo motor is square, the cross section of the motor sleeve is also set to be square, thereby reducing the influence of the motor sleeve on the aerodynamic characteristics of the propeller behind it.

[0049] The motor sleeve has a circle of through holes at the lower end, and the front cone sleeve has threaded holes at the corresponding position on the upper end. The two are tightened and connected by a circle of screws. Square holes are opened on three sides of the motor sleeve to reduce the weight of the system. Another side is slotted straight through to the rear end to facilitate the insertion of the protruding terminal of the servo motor.

[0050] The photoelectric sensor is fixed on the upper right side of the motor sleeve and measures the average rotation speed of the propeller through the basic principle of laser counting.

[0051] Example 1

[0052] In the description of this embodiment, it should be noted that the terms "upper," "lower," "front," "rear," "left and right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating positions or locations, are based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0053] For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0054] Figure 1 The figure shows an assembly diagram of a propeller test support device suitable for a vertical wind tunnel according to the present invention, including a side support rod 1, a fairing head 2, a support plate 3, a fairing 4, a front cone 5, a servo motor 6, a motor sleeve 7, a photoelectric sensor 8 and a propeller 9. The internal structure of the fairing is shown in FIG. Figure 2 As shown, it includes a side support rod 1, a support plate 3, a rear cone sleeve 10, a balance 11 and a nut 12.

[0055] The shape of the rear cone sleeve 10 is as follows Figure 3 As shown. Combined Figure 2 and Figure 3 As can be seen, the upper inner surface of the rear cone sleeve 10 has a 1:10 inner taper 101, which mates with the 1:10 outer taper below the balance 11, and is secured with a lateral wedge. Preferably, this taper fit should meet the military standard for force measurement, which requires a taper contact area of at least 85%. The lower outer surface of the rear cone sleeve 10 has a 1:10 outer taper 102 with a tapered keyway 103, which mates with the 1:10 inner surface of the left end of the side support 1, with the two secured by a key. Preferably, the conical surface fit should meet the national military standard force measurement requirements, that is, the conical surface contact area should be no less than 85%; there is a cylindrical outer surface below the rear cone sleeve 10, and there is a cylindrical keyway 104 on the surface, which is positioned and matched with the circular hole in the middle of the support plate 3, and the two are positioned by a key; the bottom of the rear cone sleeve 10 is a section of external thread 105. During assembly, the corresponding nut 12 is tightened from bottom to top along the external thread to firmly fix the support plate 3 on the lower surface of the left end of the side support rod 1.

[0056] like Figure 1 As shown, the top of the rectifier head 2 and the bottom of the support plate 3 are tightened and connected by four circumferential countersunk screws to ensure a reliable and stable connection. Preferably, the cross-sectional shape of the rectifier head 2 gradually transitions from square to circular from top to bottom, allowing the airflow to flow evenly through the rectifier head 2 without causing significant separation, thus ensuring the accuracy of the wind tunnel test to a certain extent.

[0057] The fairing 4 is tightened to the support plate 3 by three rows of 12 countersunk screws. Correspondingly, a corresponding hole is opened in the lower right corner of the fairing 4, and a corresponding hole is also opened on the right side of the support plate 3. When the two are connected, the left end of the side support rod 1 can be deeply inserted and the rear cone sleeve 10 can be fixed.

[0058] Preferably, since the fairing 4 and the fairing head 2 do not need to bear force and their function is only to allow the airflow to pass smoothly, aluminum is selected as the material of the fairing head 2 and the fairing 4 to achieve the effect of reducing the overall weight of the system.

[0059] The lower middle end of the front cone sleeve 5 features a standard 1:5 internal cone surface, which mates with the 1:5 external surface of the head of the balance 11, with a key providing a positioning fit between the two. Preferably, the cone surface fit should meet the national military standard for force measurement, which requires a cone contact surface of no less than 85%. The upper middle end of the front cone sleeve 5 features an M12 standard internal thread. During installation, an M8 bolt is threaded through this threaded hole into the M8 internal threaded hole on the end face of the balance head. The bolt is then rotated and tightened to achieve a tight fit between the balance head 11 and the front cone sleeve 5, ensuring that all forces acting on the upper mechanism are transferred to the balance head 11, ensuring accurate and reliable measurement data.

[0060] Accordingly, when disassembling the front cone sleeve 5, an M12 bolt is screwed into the M12 internal thread on the upper end of the front cone sleeve 5. When the bolt hits the end face of the balance head, it is rotated firmly to disengage the tight fit between the two conical surfaces, making the system easy and quick to disassemble. Preferably, to reduce the weight of the front cone sleeve 5, while ensuring rigidity, a groove of a certain depth is excavated on the upper end face of the front cone sleeve 5 to reduce the load on the balance axial element.

[0061] The servo motor 6 is positioned by a circular ring with a 60mm diameter at its upper end and secured to the interior of the motor sleeve 7 using four screws and nuts. Corresponding holes are provided on the four upper sides of the motor sleeve 7 to facilitate quick and easy assembly and disassembly of the servo motor 6. Preferably, since the servo motor 6 has a square cross-section, the motor sleeve 7 is also square in cross-section to minimize its impact on the aerodynamic characteristics of the rear propeller 9.

[0062] The motor sleeve 7 has a circle of five through-holes at its lower end, and five M4 threaded holes at the corresponding upper end of the front cone sleeve 5. A circle of five screws secures the two together. Preferably, three sides of the motor sleeve 7 have square holes to reduce system weight. Another side has a slot extending through the rear end to facilitate insertion of the protruding connector of the servo motor 6.

[0063] The photoelectric sensor 8 is fixed on the upper right side of the motor sleeve 7, and measures the movement process of the propeller 9 through the basic principle of laser counting, and finally obtains the average speed of the propeller over a period of time through data processing and analysis.

[0064] During the test, in order to further reduce interference, the threaded countersunk hole can be blocked, for example, by using plasticine.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A propeller test support device suitable for a vertical wind tunnel, characterized in that: The propeller test support device includes: a fairing device, a force measuring device and a side support; The fairing device includes a fairing head and a fairing cover; The force measuring device includes a rear cone sleeve, a balance, a front cone sleeve, a motor sleeve, a servo motor, and a photoelectric sensor; the rear cone sleeve, the balance, the front cone sleeve, the motor sleeve, the servo motor, and the propeller are fixedly connected in sequence; The side supports include side support rods and support plates.

2. The propeller test support device suitable for a vertical wind tunnel according to claim 1, characterized in that: The upper inner surface of the rear cone sleeve has a 1:10 inner cone surface, which cooperates with the 1:10 outer cone surface below the balance, and is tightened and fixed on the side using an inclined wedge; the lower outer surface of the rear cone sleeve is a 1:10 outer cone surface, and the surface has a conical keyway, which cooperates with the 1:10 inner surface of the left end of the side support rod, and the two are positioned by a key.

3. The propeller test support device suitable for a vertical wind tunnel according to claim 2, characterized in that: The rear cone sleeve has a cylindrical outer surface at the bottom, and a cylindrical keyway is provided on the surface, which is positioned and matched with the circular hole in the middle of the support plate, and the two are positioned by a key.

4. The propeller test support device suitable for a vertical wind tunnel according to claim 3, characterized in that: The bottom of the rear cone sleeve is an external thread. During assembly, a corresponding nut is tightened from bottom to top along the external thread to firmly fix the support plate on the lower surface of the left end of the side support rod.

5. The propeller test support device suitable for a vertical wind tunnel according to claim 4, characterized in that: The cross-sectional shape of the rectifying head changes from square to circular from top to bottom, so that the airflow flows evenly through the rectifying head; the rectifying head is fixed under the support plate by screws.

6. The propeller test support device suitable for a vertical wind tunnel according to claim 5, characterized in that: The fairing is connected to the bottom of the support plate by screws; the fairing has a corresponding hole in the lower right corner, and the support plate also has a corresponding hole on the right side. After the two are connected, the left end of the side support rod is penetrated and the rear cone sleeve is fixed.

7. The propeller test support device suitable for a vertical wind tunnel according to claim 6, characterized in that: The lower end of the middle part of the front cone sleeve has a standard 1:5 inner cone surface, which functions to cooperate with the 1:5 outer surface of the balance head, and the two are positioned and matched by a key; the cone surface fit meets the national military standard force measurement requirements, that is, the cone surface contact area should be no less than 85%.

8. The propeller test support device suitable for a vertical wind tunnel according to claim 7, characterized in that: The upper end of the middle part of the front cone sleeve is an M12 standard internal thread. During installation, an M8 bolt is passed through the internal thread and into the M8 internal thread hole on the end face of the balance head. Rotate and tighten to achieve a tight fit between the balance head and the conical surface of the front cone sleeve, ensuring that all the force on the upper end mechanism is transmitted to the balance 11 head, and the measurement data is accurate and reliable.

9. The propeller test support device suitable for a vertical wind tunnel according to claim 8, characterized in that: The servo motor is positioned by a circular ring with a diameter of 60 mm on the upper end surface and fixed to the inside of the motor sleeve using screws and nuts; accordingly, corresponding holes are opened on the four sides of the upper part of the motor sleeve to enable convenient and quick disassembly and assembly of the servo motor; Since the cross section of the servo motor is square, the cross section of the motor sleeve is also set to be square, thereby reducing the influence of the motor sleeve on the aerodynamic characteristics of the rear propeller.

10. The propeller test support device suitable for a vertical wind tunnel according to claim 9, characterized in that: The motor sleeve has a circle of through holes at the lower end, and the front cone sleeve has threaded holes at the corresponding position on the upper end. The two are tightened and connected by a circle of screws. Square holes are opened on three sides of the motor sleeve to reduce the weight of the system. Another side is slotted straight through to the rear end to facilitate the insertion of the protruding terminal of the servo motor. The photoelectric sensor is fixed on the upper right side of the motor sleeve and measures the average rotation speed of the propeller through the basic principle of laser counting.

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