CN103630329A - Testing device and method for evaluating drag-reduction effect of bionic jet surface - Google Patents
Testing device and method for evaluating drag-reduction effect of bionic jet surface Download PDFInfo
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- CN103630329A CN103630329A CN201310697579.7A CN201310697579A CN103630329A CN 103630329 A CN103630329 A CN 103630329A CN 201310697579 A CN201310697579 A CN 201310697579A CN 103630329 A CN103630329 A CN 103630329A
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Abstract
The invention aims to provide a testing device and a testing device method for evaluating a drag-reduction effect of a bionic jet surface. The testing device comprises a stepping motor, a propeller, a torque signal coupler, a pump and a water tank, wherein the water tank is filled with water, the pump is communicated with the water tank and is communicated with a testing cylinder model through a first pipeline, the water tank is communicated with the testing cylinder model through a second pipeline, and a ball valve is mounted on the first pipeline; the right end of the testing cylinder model is fixed on a bracket, the propeller is arranged in the testing cylinder model, the stepping motor is located at the outer part of the right side of the testing cylinder model and is connected by the propeller by a shaft, and the left end part of the testing cylinder model is connected with the torque signal coupler. According to the testing device, the propeller is utilized for providing power to the speed of a main flow field, so that the flow speed is stable. The testing method is simple and intuitional and provides a reliable result.
Description
Technical field
What the present invention relates to is a kind of test unit and test method of test fluid flow Surface Structures frictional resistance.
Background technology
Main energy consumption when means of transport is advanced in water is for overcoming running resistance, therefore carries out resistance analysis and reduces resistance, for saving the energy, improving working condition, improves work efficiency significant.Means of transport running resistance is mainly comprised of frictional resistance and pressure drag, and wherein frictional resistance accounts for the overwhelming majority of drag overall, carries out the key of resistance analysis when therefore carrying out the analysis of frictional resistance and measuring.
At present, the drag reduction proving installation of non-smooth surface and jet surface focuses mostly in rotating jet method of testing, as number of patent application is: 201110089369.0, name is called " test unit of assessment bionic non-smooth surface and bionical jet surface drag-reduction effect " and number of patent application is: 201120070969.8, name is called " a kind of test unit to frictional resistance test ", by the main flow field velocity of rotating to be of cylindrical shell, provide power, the bad control of flow velocity.
Summary of the invention
The object of the present invention is to provide test unit and the test method that can realize the bionical jet surface drag-reduction effect of assessment of bionical jet surface drag-reduction effect test, the test of non-smooth surface structure drag-reduction effect, the test of surperficial applying coating drag-reduction effect.
The object of the present invention is achieved like this:
The present invention assesses the test unit of bionical jet surface drag-reduction effect, it is characterized in that: comprise stepper motor, screw propeller, torque signal coupling mechanism, pump, water tank, in water tank, fill liquid, pump joining water box, between pump and test cylinder model, by the first pipeline, be connected, between water tank and test cylinder model, by second pipe, be connected, mounting ball valve on the first pipeline, the right-hand member of test cylinder model is fixed on support, screw propeller is arranged in test cylinder model, stepper motor is positioned at test cylinder model right hand external, stepper motor is connected by axle with screw propeller, the left part of test cylinder model connects torque signal coupling mechanism, stepper motor drives screw propeller rotation, and the liquid of test cylinder model inside is motion together thereupon, and the liquid of motion produces frictional resistance to test cylinder model, by torque signal coupling mechanism, can obtain the torque signal that test cylinder model produces.
The test unit that the present invention assesses bionical jet surface drag-reduction effect can also comprise:
1, described stepper motor connects servo composite stepper motor driver.
The 3rd pipeline that 2, bypass is set on the first pipeline, the 3rd pipeline is connected with water tank, on the 3rd pipeline, surplus valve is installed, and flowmeter is also installed on the first pipeline.
The present invention assesses the test method of bionical jet surface drag-reduction effect, it is characterized in that: adopt following test unit: comprise stepper motor, screw propeller, torque signal coupling mechanism, pump, water tank, in water tank, fill liquid, pump joining water box, between pump and test cylinder model, by the first pipeline, be connected, between water tank and test cylinder model, by second pipe, be connected, mounting ball valve on the first pipeline, the right-hand member of test cylinder model is fixed on support, screw propeller is arranged in test cylinder model, stepper motor is positioned at test cylinder model right hand external, stepper motor is connected by axle with screw propeller, the left part of test cylinder model connects torque signal coupling mechanism,
(1) stepper motor starts, and by the rotating speed of servo composite stepper motor driver control stepper motor, the liquid motion in propeller-driven test cylinder detects the torque signal that torque signal coupling mechanism is exported simultaneously;
(2) open the ball valve of jet pipeline, regulate the flow of jet pipeline, then draw the speed of jet inlet, detect the torque signal of torque signal coupling mechanism simultaneously;
(3) moment of torsion that moment of torsion step (1) being recorded and step (2) record subtracts each other, then the moment of torsion recording divided by step (1), and acquired results is the drag reducing efficiency of bionical jet surface.
Advantage of the present invention is: the present invention adopts screw propeller to provide power, flow speed stability for main flow field velocity.Realization to bionical jet surface drag-reduction effect test, non-smooth surface structure drag-reduction effect test and the test of surface coating drag-reduction effect, signal acquiring system is simple in structure, processing ease, test is accurately; The moment that the present invention causes by contrast smooth surface test cylinder model and bionical jet surface test cylinder model, non-smooth surface test cylinder model is weighed the drag-reduction effect of the non-smooth surfaces such as bionical jet surface and pit, convex closure.Assess the method simple, intuitive of bionical jet surface, non-smooth surface and surface coating structure drag-reduction effect, reliable results.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, for example the present invention is described in more detail:
In conjunction with Fig. 1, the present invention is comprised of stepper motor 11, servo composite stepper motor driver 12, flexible sheet shaft coupling 10, screw propeller 8, test cylinder model 9, torque signal coupling mechanism 6, pump 2, water tank 1, flowmeter 5, surplus valve 3 and necessary pipeline connecting parts.Servo composite stepper motor driver 12 is connected with stepper motor 11, and stepper motor 11 is connected with the input shaft of screw propeller 8 with flexible sheet shaft coupling 12, for screw propeller 8 provides power; Right-hand member and the support of test cylinder model 9 are fixed together, and left end is connected with torque signal coupling mechanism 6 by flexible sheet shaft coupling 7; Described screw propeller 8 is installed on test cylinder model 9 inside, between propeller shaft and test cylinder model 9, bearing is housed, and end cap seal performance is good, guarantees that the liquid in test cylinder model 9 is not revealed; Described surplus valve 3, pump 2 and water tank 1 form a closed-loop path, and the effect of surplus valve 3 is the top hole pressures that regulate pump 2, by regulating the aperture of ball valve 4 to regulate the speed of jet inlet.
Principle of work of the present invention is:
Assessing bionical jet surface drag-reduction effect method concrete steps is:
A, stepper motor 11 start, and by the rotating speed of servo composite stepper motor driver 12 control step motors 11, screw propeller 8 drives the liquid motion in test cylinder, detects the torque signal of torque signal coupling mechanism 6 simultaneously;
B, open the ball valve 4 of jet pipeline, regulate the flow of jet pipeline, then draw the speed of jet inlet, detect the torque signal of torque signal coupling mechanism 6 simultaneously;
C, assess the drag-reduction effect of bionical jet surface, the moment of torsion that the bionical jet surface that the moment of torsion that the smooth surface that a is recorded causes and b record causes subtracts each other, then the moment of torsion causing divided by smooth surface, and acquired results is the drag reducing efficiency of bionical jet surface.
The present invention is received, is processed by the signal to detecting, can assess easily the drag-reduction effect of bionical jet surface, non-smooth surface structure and surface coating structure, the present invention is simple in structure, is also applicable to non-smooth surface structure and coating surface structure fluid friction resistance to detect and assess its drag-reduction effect.
Claims (4)
1. assess the test unit of bionical jet surface drag-reduction effect, it is characterized in that: comprise stepper motor, screw propeller, torque signal coupling mechanism, pump, water tank, in water tank, fill liquid, pump joining water box, between pump and test cylinder model, by the first pipeline, be connected, between water tank and test cylinder model, by second pipe, be connected, mounting ball valve on the first pipeline, the right-hand member of test cylinder model is fixed on support, screw propeller is arranged in test cylinder model, stepper motor is positioned at test cylinder model right hand external, stepper motor is connected by axle with screw propeller, the left part of test cylinder model connects torque signal coupling mechanism, stepper motor drives screw propeller rotation, and the liquid of test cylinder model inside is motion together thereupon, and the liquid of motion produces frictional resistance to test cylinder model, by torque signal coupling mechanism, can obtain the torque signal that test cylinder model produces.
2. the test unit of the bionical jet surface drag-reduction effect of assessment according to claim 1, is characterized in that: described stepper motor connects servo composite stepper motor driver.
3. the test unit of the bionical jet surface drag-reduction effect of assessment according to claim 1 and 2, it is characterized in that: the 3rd pipeline that bypass is set on the first pipeline, the 3rd pipeline is connected with water tank, on the 3rd pipeline, surplus valve is installed, and flowmeter is also installed on the first pipeline.
4. assess the test method of bionical jet surface drag-reduction effect, it is characterized in that: adopt following test unit: comprise stepper motor, screw propeller, torque signal coupling mechanism, pump, water tank, in water tank, fill liquid, pump joining water box, between pump and test cylinder model, by the first pipeline, be connected, between water tank and test cylinder model, by second pipe, be connected, mounting ball valve on the first pipeline, the right-hand member of test cylinder model is fixed on support, screw propeller is arranged in test cylinder model, stepper motor is positioned at test cylinder model right hand external, stepper motor is connected by axle with screw propeller, the left part of test cylinder model connects torque signal coupling mechanism,
(1) stepper motor starts, and by the rotating speed of servo composite stepper motor driver control stepper motor, the liquid motion in propeller-driven test cylinder detects the torque signal that torque signal coupling mechanism is exported simultaneously;
(2) open the ball valve of jet pipeline, regulate the flow of jet pipeline, then draw the speed of jet inlet, detect the torque signal of torque signal coupling mechanism simultaneously;
(3) moment of torsion that moment of torsion step (1) being recorded and step (2) record subtracts each other, then the moment of torsion recording divided by step (1), and acquired results is the drag reducing efficiency of bionical jet surface.
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| CN201310697579.7A CN103630329A (en) | 2013-12-18 | 2013-12-18 | Testing device and method for evaluating drag-reduction effect of bionic jet surface |
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| CN201310697579.7A CN103630329A (en) | 2013-12-18 | 2013-12-18 | Testing device and method for evaluating drag-reduction effect of bionic jet surface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424319A (en) * | 2015-12-29 | 2016-03-23 | 浙江工业大学 | Bionics-based underwater jet surface drag reduction test device |
| CN106482926A (en) * | 2016-09-29 | 2017-03-08 | 浙江工业大学 | Based on multifunctional bionic drag reduction test device under water |
| CN112345204A (en) * | 2020-11-27 | 2021-02-09 | 江苏科技大学 | Underwater bionic fin immersion type propulsion testing device and method |
| CN114154246A (en) * | 2021-12-07 | 2022-03-08 | 中国船舶科学研究中心 | Friction-reducing resistance effect test evaluation method for rotating cylinder |
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| EP0383852A1 (en) * | 1988-05-26 | 1990-08-29 | Bmt Fluid Mechanics Limited | Improvements in or relating to reduction of drag |
| CN102183356A (en) * | 2011-03-17 | 2011-09-14 | 哈尔滨工程大学 | Device for testing fluid friction resistance |
| CN102226736A (en) * | 2011-04-11 | 2011-10-26 | 哈尔滨工程大学 | Testing apparatus for evaluating drag-reduction effects of bionic non-smooth surface and bionic jet surface |
| CN102998087A (en) * | 2012-11-27 | 2013-03-27 | 哈尔滨工程大学 | Resistance testing device suitable for jet flow surface and non-smooth surface |
| CN103063404A (en) * | 2013-01-10 | 2013-04-24 | 哈尔滨工程大学 | Testing device applied to drag reducing testing of jet flow surface and non-smooth surface |
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2013
- 2013-12-18 CN CN201310697579.7A patent/CN103630329A/en active Pending
Patent Citations (5)
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| EP0383852A1 (en) * | 1988-05-26 | 1990-08-29 | Bmt Fluid Mechanics Limited | Improvements in or relating to reduction of drag |
| CN102183356A (en) * | 2011-03-17 | 2011-09-14 | 哈尔滨工程大学 | Device for testing fluid friction resistance |
| CN102226736A (en) * | 2011-04-11 | 2011-10-26 | 哈尔滨工程大学 | Testing apparatus for evaluating drag-reduction effects of bionic non-smooth surface and bionic jet surface |
| CN102998087A (en) * | 2012-11-27 | 2013-03-27 | 哈尔滨工程大学 | Resistance testing device suitable for jet flow surface and non-smooth surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424319A (en) * | 2015-12-29 | 2016-03-23 | 浙江工业大学 | Bionics-based underwater jet surface drag reduction test device |
| CN106482926A (en) * | 2016-09-29 | 2017-03-08 | 浙江工业大学 | Based on multifunctional bionic drag reduction test device under water |
| CN106482926B (en) * | 2016-09-29 | 2019-04-12 | 浙江工业大学 | Based on underwater multifunctional bionic drag reduction test device |
| CN112345204A (en) * | 2020-11-27 | 2021-02-09 | 江苏科技大学 | Underwater bionic fin immersion type propulsion testing device and method |
| CN112345204B (en) * | 2020-11-27 | 2022-06-17 | 江苏科技大学 | Underwater bionic fin immersion type propulsion testing device and method |
| CN114154246A (en) * | 2021-12-07 | 2022-03-08 | 中国船舶科学研究中心 | Friction-reducing resistance effect test evaluation method for rotating cylinder |
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Application publication date: 20140312 |