Comprehensive performance evaluation test bed for super-hydrophobic propeller

Abstract

The utility model provides a super-hydrophobic propeller comprehensive performance evaluation test bench, which comprises a bottom plate, a tension paddle testboard, a heat preservation cover body, a static balance tester and a direct current stabilized power supply, the static balance tester and the tension paddle testboard are fixedly arranged on the bottom plate, a brushless motor and a vibration sensor are arranged on the tension paddle testboard, and the static balance tester and the vibration sensor are fixedly arranged on the bottom plate. The brushless motor is provided with a power shaft on which propeller blades can be mounted, the direct-current stabilized power supply is used for supplying power to the tension paddle test board, the brushless motor and the vibration sensor, and the heat preservation cover body is detachably mounted on the bottom plate. The test bench can comprehensively test dynamic balance, static balance, tension, vibration and the like of the propeller, so that scientific researchers can conveniently compare tension characteristics and power characteristics of a super-hydrophobic propeller and a non-super-hydrophobic propeller under an icing condition and a non-icing condition; and comprehensive test and evaluation of the anti-icing performance and the working performance of the super-hydrophobic propeller are realized.

Description

Technical Field

[0001] The utility model mainly relates to the technical field related to propeller blade detection, and specifically is a super-hydrophobic propeller comprehensive performance evaluation test bench. Background Art

[0002] When aircraft that use propellers as propulsion devices operate in low temperature and high humidity environments, propeller icing is an important issue that cannot be ignored. Icing will not only destroy the aerodynamic shape of the blades and intensify vibrations; it will also greatly increase airfoil drag, resulting in reduced propeller thrust, reduced propulsion efficiency, and even serious safety accidents. Propellers with super-hydrophobic surfaces can use the hydrophobic properties of the surface to delay icing or reduce the adhesion of ice on their surfaces. For propellers of light aircraft and drones, the installation of additional electric or gas-heated anti-icing devices can be omitted, and for turboprop engines, the consumption of engine power by propeller electric anti-icing devices can be reduced. Therefore, propellers with super-hydrophobic surfaces have great engineering application value.

[0003] In current technology, propeller blades with super-hydrophobic coatings are still under research. It is necessary to analyze the distribution of ice on the propeller surface, explore the role of super-hydrophobic surfaces in anti-icing different parts of propellers, and compare the tension and power characteristics of super-hydrophobic propellers and non-super-hydrophobic propellers under icing conditions and non-icing conditions. It is particularly important to comprehensively evaluate the impact of super-hydrophobic surfaces on propeller performance. At present, most of the test equipment used to evaluate propeller blades can only test the propeller tension, and cannot complete a comprehensive evaluation from all aspects. Therefore, it is necessary to design a highly integrated and easy-to-use test bench to analyze the comprehensive performance of super-hydrophobic propellers. Utility Model Content

[0004] In order to address the deficiencies of current technology, the utility model combines the existing technology and, based on practical applications, provides a super-hydrophobic propeller comprehensive performance evaluation test bench, which can perform comprehensive tests on the dynamic balance, static balance, tension, vibration, etc. of the propeller, thereby facilitating scientific researchers to compare the tension characteristics and power characteristics of super-hydrophobic propellers and non-super-hydrophobic propellers under icing conditions and non-icing conditions, and realizing comprehensive testing and evaluation of the anti-icing performance and working efficiency of super-hydrophobic propellers.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A super-hydrophobic propeller comprehensive performance evaluation test bench comprises a base plate, a propeller test bench, a thermal insulation cover, a static balance tester and a DC regulated power supply. The static balance tester and the propeller test bench are fixedly mounted on the base plate. A brushless motor and a vibration sensor are mounted on the propeller test bench. The brushless motor has a power shaft on which propeller blades can be mounted. The DC regulated power supply is used to power the propeller test bench, the brushless motor and the vibration sensor. The thermal insulation cover is detachably mounted on the base plate.

[0007] Furthermore, the tension paddle test bench includes a seat body, a controller, a guide rail slider assembly and a column sensor. A movable plate is arranged on the guide rail slider assembly, a flange is arranged at one end of the movable plate, a brushless motor is mounted on the flange, a vibration sensor is mounted on the seat body, a slot is arranged on the movable plate, and the column sensor is located in the slot.

[0008] Furthermore, the DC regulated power supply is connected to a controller of the pull paddle test bench via a power line, the controller is connected to the brushless motor via a control line, and a speed regulator is connected to the control line.

[0009] Furthermore, a rotation speed sensor is also installed on the base of the pulling propeller test bench, and the rotation speed sensor is used to detect the rotation speed of the propeller blades installed on the brushless motor.

[0010] Furthermore, at least one static balance tester is provided, and the static balance tester is located on one side of the pulling propeller test bench.

[0011] Furthermore, the static balance tester includes a bracket and a central axis, and the propeller blades can be installed on the central axis.

[0012] Furthermore, the bottom plate is provided with fixing grooves around it, and the heat-insulating cover body is a rectangular structure with an opening at the bottom, and the heat-insulating cover body can be placed around it in the fixing grooves.

[0013] Furthermore, the heat-insulating cover body is provided with ventilation holes.

[0014] Furthermore, at least one opening is arranged on the heat-insulating cover body, and a plug is arranged at the opening.

[0015] Furthermore, transparent glass is provided on at least one surface of the heat-insulating cover.

[0016] Beneficial effects of the utility model:

[0017] 1. The test bench of the utility model has a high degree of integration and has comprehensive evaluation performance. The static balance tester integrated in the test bench can perform a static balance test on each propeller blade before the test to ensure that the blades meet the static balance requirements. At the same time, the pulling propeller test bench cooperates with the vibration sensor to detect the dynamic balance of the blades to ensure that the blades meet the dynamic balance requirements. Finally, the pulling propeller test bench can realize a comprehensive evaluation of the pulling characteristics and power characteristics of the propeller under icing conditions and non-icing conditions, thereby analyzing the influence of the superhydrophobic surface on the working efficiency of the propeller.

[0018] 2. The overall structural layout of the test bench of the utility model is reasonable, the structure is simple, and the functionality is diverse and complete. The configured thermal insulation cover can provide a relatively closed space for insulation for the test bench, so that the propeller blades in the space can freeze quickly, thereby facilitating the subsequent performance evaluation of the propeller under icing exposure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 This is a schematic diagram of the state when the thermal insulation cover body is used in the utility model.

[0020] Attached Figure 2 This is a schematic diagram of the utility model when the heat preservation cover is not used.

[0021] Attached Figure 3 This is a wiring diagram of the utility model.

[0022] Attached Figure 4 Schematic diagram of blade static balance test.

[0023] Numbers shown in the accompanying drawings:

[0024] 1. Bottom plate; 2. Insulation cover; 3. Seat; 4. Guide rail slider assembly; 5. Movable plate; 6. Column sensor; 7. Controller; 8. Brushless motor; 9. Propeller blades; 10. Fixing slot; 11. Vibration sensor; 12. Static balance tester; 13. Center axis; 14. DC regulated power supply; 15. Speed ​​regulator; 16. Speed ​​sensor. DETAILED DESCRIPTION

[0025] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.

[0026] The present embodiment provides a super-hydrophobic propeller comprehensive performance evaluation test bench, which mainly includes a bottom plate 1, a propeller test bench, a heat preservation cover 2, a static balance tester 12, and a DC stabilized power supply 14.

[0027] Among them, the base plate 1 is used to provide overall support, the paddle pull test bench and the static balance tester 12 are installed on the base plate 1, and the DC regulated power supply 10 is connected to the paddle pull test bench through the corresponding power line to provide power for the test bench.

[0028] For the thrust propeller test bench of this embodiment, it can detect the thrust characteristics and power characteristics of the propeller blade 9, so as to obtain the aerodynamic performance of the propeller blade 9. In this embodiment, the thrust propeller test bench mainly includes a seat body 3, a controller 7, a guide rail slider assembly 4 and a column sensor 6, wherein the seat body 3 is fixed on the upper surface of the bottom plate 1, the guide rail slider assembly 4 is installed on the seat body 3, and a movable plate 5 is installed on the slider of the guide rail slider assembly 4. The movable plate 5 can freely move in the horizontal direction along the guide rail, a flange is provided at one end of the movable plate 5 and a brushless motor 8 is installed, and a slot is provided at the other end of the movable plate, and the upper end of the column sensor 6 is located in the slot. The propeller blade 9 to be tested is installed on the brushless motor 8 in the pull propeller test bench of the above structure. After the brushless motor 8 is started, as the propeller blade 9 rotates, the tension generated by it acts on the movable plate 5, and the movable plate 5 is displaced along the guide rail. The displacement is transmitted to the column sensor 6 through the slot at the rear end. The tension signal can be detected by the strain of the column sensor 6. The tension is finally displayed on the display screen corresponding to the controller 7. The aerodynamic performance of the propeller blade 9 is obtained by measuring the tension. For the pull propeller test bench of the above structure, the finished product can be purchased directly, and after purchase, it can be modified according to the relevant technology of this application.

[0029] As shown in the figure, two static balance testers 12 are installed on the bottom plate 1 of the present embodiment. The static balance tester 12 includes a bracket and a central shaft 13. The propeller blade 9 is installed on the central shaft 13, and its static balance performance can be tested by observing its state change. At the same time, a vibration sensor 11 is also installed on the base 3. The propeller blade 9 is installed on the brushless motor 8. By observing the data change of the vibration sensor 11 when it rotates, the dynamic balance performance of the propeller blade 9 can be obtained, thereby ensuring that all propeller blades 9 meet the requirements of dynamic balance and static balance during the test.

[0030] In this embodiment, a speed sensor 16 is also provided on the seat body 3, and the speed sensor 16 is mainly used to measure the rotation speed of the propeller blades 9, so that the running speed of the motor can be controlled by the corresponding speed regulator 15. The DC regulated power supply 14 is used to supply power to the corresponding components that need power supply.

[0031] This test bench can measure the changes in the comprehensive performance of propeller blades 9 (including blades with super-hydrophobic coating and blades without super-hydrophobic coating) in normal state and frozen state. Propeller blades 9 need to be operated in an environment with low temperature and high humidity before they can enter the frozen state. Therefore, this embodiment is provided with a heat preservation cover 2, which can be installed in the fixed groove 10 arranged around the base plate 1. When the heat preservation cover 2 is installed, the pull propeller test bench can be covered inside. At this time, a humidifier and a liquid nitrogen tank can be placed in the heat preservation cover 2, so that the space inside the heat preservation cover 2 is rapidly cooled to a low temperature state. When the propeller blades 9 rotate in this space, their surface freezes rapidly, thereby obtaining the propeller blades 9 in the frozen state. At this time, the propeller blades 9 in the frozen state can be tested for aerodynamic performance. In a specific implementation method provided in this embodiment, if the external temperature is high, the propeller blades 9 can be continuously rotated in the heat preservation cover 2, so as to measure the aerodynamic performance through the corresponding sensor, and the air vents arranged on the propeller blades 9 are used to provide air circulation. In another specific implementation provided by this embodiment, if the outside temperature is low, the propeller blades 9 will not be quickly freed from the frozen state after the heat preservation cover 2 is opened. In this case, the propeller blades 9 can be frozen, and then the heat preservation cover 2 can be opened for rapid inspection. Preferably, a corresponding opening is provided on the heat preservation cover 2 for leading out power lines, control lines and other leads. Furthermore, a transparent glass is provided on the heat preservation cover 2 to facilitate observation of the internal frozen state.

[0032] In this embodiment, it is necessary to conduct a comparative test on the propeller blades 9 with and without the super-hydrophobic coating. The super-hydrophobic coating is formed on the surface of the propeller blade 9 by spraying. The preparation of the super-hydrophobic coating belongs to the prior art and will not be further described here.

[0033] In this embodiment, the test bench can measure the parameters such as the pulling force, power consumption and vibration value of the propeller blade 9 at different speeds. The speed adjustment range is 0-99999r / min, and the vibration value measurement range is 0-100μm. In addition, the DC regulated power supply can provide a voltage of 0-30V, and the DC voltage selected for the test is 12V.

[0034] Before evaluating the working performance of the propeller, it is necessary to ensure that all propellers meet the static balance and dynamic balance. The propeller blades used in the experiment are carbon fiber propellers with a pitch of 5.5 inches and a blade diameter of 9 inches.

[0035] Static balance verification: all propeller blades 9 involved in the experiment are installed to the central axis 13 of the static balance tester 12 in sequence, and whether the propeller blades 9 are symmetrically balanced on the central axis 13 is observed. Figure 4(a) shows a static unbalanced state, and (b) shows a static balanced state. Through static balance verification, it is ensured that all propeller blades 9 can maintain a horizontal state without any contact, meeting the static balance requirement.

[0036] Dynamic balance verification: The propellers that meet the static balance are installed on this test bench in turn, and the dynamic balance verification is performed through the change law of the vibration value of the propeller blade 9 with the speed. During the test, the speed of all propeller blades is gradually increased from 0 to 7000r / min, and the value change of the vibration sensor 11 is always kept within the threshold, ensuring that all propellers meet the dynamic balance requirements.

[0037] Liquid nitrogen and a humidifier were placed on the bottom plate 1, and after the heat preservation cover 2 was installed, a low-temperature test chamber was quickly formed inside. After the propeller blades 9 were operated at a speed of 4000r / min for 120s, ice appeared on the surface to varying degrees. The iced areas and iced states on the super-hydrophobic propeller blades and non-super-hydrophobic propeller blades were observed. By comparing the distribution of ice on the surfaces of the super-hydrophobic propellers and non-super-hydrophobic propellers, it was found that the super-hydrophobic surface had a certain effect on inhibiting ice formation at the leading edge.

[0038] This test bench can measure the change of propeller thrust and power consumption with the increase of speed when super-hydrophobic propellers and non-super-hydrophobic propellers are running at normal temperature and in icing state. Through the test, it can be seen that icing destroys the original aerodynamic performance of the propeller, causing significant changes in thrust and power consumption. Therefore, the change of propeller thrust and power consumption with the propeller operation time can further evaluate the anti-icing performance of super-hydrophobic propellers.

Claims

1. A super-hydrophobic propeller comprehensive performance evaluation test bench, characterized in that: It includes a base plate, a propeller test bench, a thermal insulation cover, a static balance tester and a DC regulated power supply. The static balance tester and the propeller test bench are fixedly installed on the base plate. The propeller test bench is installed with a brushless motor and a vibration sensor. The brushless motor has a power shaft on which propeller blades can be installed. The DC regulated power supply is used to power the propeller test bench, the brushless motor and the vibration sensor. The thermal insulation cover is detachably installed on the base plate.

2. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 1, characterized in that: The pull paddle test bench includes a seat body, a controller, a guide rail slider assembly and a column sensor. A movable plate is arranged on the guide rail slider assembly, a flange is arranged at one end of the movable plate, a brushless motor is mounted on the flange, a vibration sensor is mounted on the seat body, a slot is arranged on the movable plate, and the column sensor is located in the slot.

3. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 2, characterized in that: The DC regulated power supply is connected to the controller of the pull-paddle test bench through a power line, the controller is connected to the brushless motor through a control line, and a speed regulator is connected to the control line.

4. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 3, characterized in that: A rotation speed sensor is also installed on the seat of the pulling propeller test bench, and the rotation speed sensor is used to detect the rotation speed of the propeller blades installed on the brushless motor.

5. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 1, characterized in that: At least one static balance tester is provided, and the static balance tester is located at one side of the pulling propeller test bench.

6. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 5, characterized in that: The static balance tester comprises a bracket and a central shaft, and the propeller blades can be mounted on the central shaft.

7. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 1, characterized in that: The bottom plate is provided with fixing grooves around it, and the heat-insulating cover body is a rectangular structure with an opening at the bottom, and the heat-insulating cover body can be placed in the fixing grooves around it.

8. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 7, characterized in that: The heat-insulating cover body is provided with ventilation holes.

9. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 7, characterized in that: At least one opening is arranged on the heat-insulating cover body, and a plug is arranged at the opening.

10. The super-hydrophobic propeller comprehensive performance evaluation test bench according to claim 7, characterized in that: Transparent glass is arranged on at least one surface of the heat-insulating cover.

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