CN103645030A - Testing method and device for assessing drag reduction effect of bionic non-smooth surface revolution body wall - Google Patents
Testing method and device for assessing drag reduction effect of bionic non-smooth surface revolution body wall Download PDFInfo
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- CN103645030A CN103645030A CN201310697578.2A CN201310697578A CN103645030A CN 103645030 A CN103645030 A CN 103645030A CN 201310697578 A CN201310697578 A CN 201310697578A CN 103645030 A CN103645030 A CN 103645030A
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Abstract
The invention provides a testing method and a device for assessing the drag reduction effect of a bionic non-smooth surface revolution body wall. The testing device for assessing the drag reduction effect of the bionic non-smooth surface revolution body wall comprises a pool, a sliding block, a guide rail, a connecting rod and a force measuring element; the guide rail is arranged above the pool; the sliding block which is installed on the guide rail can roll along the guide rail through a rolling wheel; a revolution body wall testing model is arranged inside the pool; the revolution body wall testing model is connected with the sliding block through the connecting rod; a force transmission rod is arranged on the connecting rod; the force measuring element is installed on the force transmission rod. According to the testing method and the device for assessing the drag reduction effect of the bionic non-smooth surface revolution body wall, a hanging type resistance measuring method is adopted to measure the fluid frictional resistance on the revolution body wall with the bionic non-smooth surface and a smooth surface, the resistance reduction effect of the bionic on-smooth surface is measured through a drag reduction efficiency, the testing principle is simple, the assessing method is intuitive, the testing result is reliable, and the operation is convenient.
Description
Technical field
What the present invention relates to is a kind of test unit and test method, specifically the fluid friction resistance of body of revolution wall.
Background technology
Main energy consumption when underwater sailing body is advanced in water is for overcoming running resistance, therefore carry out resistance analysis and reduce resistance, for saving the energy, improve working condition, improve work efficiency significant.The bionic, non-smooths such as pit, convex closure, groove have significant drag-reduction effect and have obtained sufficient proof, and it is the key of further applying bionic non-smooth surface technology that the drag-reduction effect of bionic non-smooth surface is carried out to evaluate and analyze.
At present, the test unit of assessment bionic non-smooth surface drag-reduction effect mainly concentrates on wheel measuring method, 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 of fluid friction resistance test ", mainly be applicable to the frictional resistance of dull and stereotyped non-smooth surface to measure, and be not suitable for the measurement of body of revolution wall fluid frictional resistance.
Summary of the invention
The object of the present invention is to provide test unit and the test method of the assessment bionic non-smooth surface body of revolution wall drag-reduction effect that can realize drag-reduction effect test, 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 bionic non-smooth surface body of revolution wall drag-reduction effect, it is characterized in that: comprise pond, slide block, guide rail, connecting rod, load-sensing unit, guide rail is arranged on the top in pond, slide block is arranged on guide rail and by roller and can rolls along guide rail, body of revolution wall test model is set in pond, body of revolution wall test model, by connecting rod connection sliding block, arranges transmission rod on connecting rod, load-sensing unit is arranged on transmission rod.
The test unit that the present invention assesses bionic non-smooth surface body of revolution wall drag-reduction effect can also comprise:
1, described body of revolution wall test model comprises smooth surface body of revolution wall test model and bionic non-smooth surface body of revolution wall test model.
2, between body of revolution wall test model and connecting rod, angulation is variable.
The present invention assesses the test method of bionic non-smooth surface body of revolution wall drag-reduction effect, it is characterized in that: adopt following test unit: comprise pond, slide block, guide rail, connecting rod, load-sensing unit, guide rail is arranged on the top in pond, slide block is arranged on guide rail and by roller and can rolls along guide rail, body of revolution wall test model is set in pond, body of revolution wall test model, by connecting rod connection sliding block, arranges transmission rod on connecting rod, load-sensing unit is arranged on transmission rod; Described body of revolution wall test model comprises smooth surface body of revolution wall test model and bionic non-smooth surface body of revolution wall test model;
(1) smooth surface body of revolution wall test model and connecting rod are connected, by transmission rod and load-sensing unit, measure the fluid friction resistance f of smooth surface body of revolution wall test model
s;
(2) change smooth surface body of revolution wall test model into bionic non-smooth surface body of revolution wall test model, repeat the fluid friction resistance f that previous step continues to measure bionic non-smooth surface body of revolution wall test model
n;
(3) drag-reduction effect of bionic non-smooth surface body of revolution wall test model represents with drag reducing efficiency DR: DR=100% * (f
s-f
n) f
s.
The test method that the present invention assesses bionic non-smooth surface body of revolution wall drag-reduction effect can also comprise:
1, change and to connect angle, repeating step (1)～(3), the drag-reduction effect drag reducing efficiency of bionic non-smooth surface body of revolution wall test model while obtaining measuring different in flow rate, the different angle of attack between water velocity and body of revolution wall model and connecting rod.
Advantage of the present invention is: the present invention adopts suspension type resistance measurement method to measure the fluid friction resistance of bionic non-smooth surface and smooth surface body of revolution wall, weighs the drag-reduction effect of bionic non-smooth surface by drag reducing efficiency.Can realize bionic non-smooth surface body of revolution wall structure and the test of surface coating structural fluid frictional resistance and the evaluation of drag-reduction effect, this apparatus structure is simple, processing ease, and test is accurately; Bionic non-smooth surface body of revolution wall can process different non-smooth surface structure (as V-type, U-shaped, pit, convex closure or applying surface coating etc.) as required, and the present invention is also applicable to the drag-reduction effect test of polymeric additive solution.Test philosophy of the present invention is simple, directly perceived, is different from the device of other assessment bionic non-smooth surface body of revolution wall structure drag-reduction effect, can directly provide the fluid friction resistance of bionic non-smooth surface, reliable test result.
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 includes pond 1, body of revolution wall test model 2, connecting rod 3 transmission rods 5, load-sensing unit 4, slide block 6 and guide rail 7, body of revolution wall test model 2 is connected with slide block 6 by connecting rod 3, mainly bears the gravity of body of revolution wall test model 2 in water; Between slide block 6 and guide rail 7, roller is housed, the sliding-frictional resistance between slide block 6 and guide rail 7 is become to rolling friction, for fluid friction resistance rolling friction negligible, make test result more accurate.Wherein, body of revolution test model 2 gos deep into below 1 liquid level of pond, and away from pond wall and bottom surface, reduces even to eliminate pond wall and the impact of free surface on body of revolution test model 2 fluid friction resistance measurement results; Slide block 6, connecting rod 3, transmission rod 5, load-sensing unit 4, body of revolution test model 2 are on same perpendicular, and the fluid friction resistance that body of revolution test model 2 walls are subject to can directly be measured by load-sensing unit 4; By the fluid friction resistance of contrast smooth surface and bionic non-smooth surface body of revolution wall, assess the drag-reduction effect of bionic non-smooth surface.
The fluid friction resistance of bionic non-smooth surface body of revolution wall when the present invention can measure different in flow rate, different angle, by carrying out recently assessing the drag-reduction effect of bionic non-smooth surface body of revolution wall with smooth surface fluid friction resistance.
The evaluation method concrete steps of described bionic non-smooth surface body of revolution wall drag-reduction effect are:
A, first measure the fluid friction resistance of smooth surface body of revolution wall, first smooth surface body of revolution wall test model 2 and connecting rod 3 are connected, by transmission rod 5 and load-sensing unit 4, measure the fluid friction resistance f of smooth surface body of revolution wall
s;
B, change smooth surface body of revolution wall model into bionic non-smooth surface body of revolution wall model, repeat the fluid friction resistance f that previous step continues to measure bionic non-smooth surface body of revolution wall
n;
C, change water velocity, the fluid friction resistance of smooth surface and bionic non-smooth surface body of revolution wall when repeating step a and b can measure different in flow rate;
D, change and to connect angle, the fluid friction resistance of smooth surface and bionic non-smooth surface body of revolution wall when repeating step a and b can measure the different angle of attack between body of revolution wall model 2 and connecting rod 3;
The drag-reduction effect of e, bionic non-smooth surface body of revolution wall represents with drag reducing efficiency DR, and computing method are
DR=100%×(f
s-f
n)f
s
Drag reducing efficiency DR is larger, and the drag-reduction effect of non-smooth surface body of revolution wall is better.
Principle of work of the present invention is:
One aspect of the present invention is measured the fluid friction resistance of bionic non-smooth surface body of revolution wall by the load-sensing unit 4 being connected with transmission rod 5, change rate of flow of fluid and body of revolution inclination angle, fluid friction resistance while measuring different in flow rate and different angle, and carry out recently assessing the drag-reduction effect of bionic non-smooth surface body of revolution wall with the smooth surface fluid friction resistance under the same terms.This apparatus structure is simple, processing ease, and test is accurately; Bionic non-smooth surface body of revolution wall can process different non-smooth surface structures as required as V-type, U-shaped, pit, convex closure or applying surface coating etc., and the present invention is also applicable to the drag-reduction effect test of polymeric additive solution.Test philosophy of the present invention is simple, directly perceived, and test result is accurate, applied range.
Claims (5)
1. assess the test unit of bionic non-smooth surface body of revolution wall drag-reduction effect, it is characterized in that: comprise pond, slide block, guide rail, connecting rod, load-sensing unit, guide rail is arranged on the top in pond, slide block is arranged on guide rail and by roller and can rolls along guide rail, body of revolution wall test model is set in pond, body of revolution wall test model, by connecting rod connection sliding block, arranges transmission rod on connecting rod, load-sensing unit is arranged on transmission rod.
2. the test unit of assessment bionic non-smooth surface body of revolution wall drag-reduction effect according to claim 1, is characterized in that: described body of revolution wall test model comprises smooth surface body of revolution wall test model and bionic non-smooth surface body of revolution wall test model.
3. the test unit of assessment bionic non-smooth surface body of revolution wall drag-reduction effect according to claim 1 and 2, is characterized in that: between body of revolution wall test model and connecting rod, angulation is variable.
4. assess the test method of bionic non-smooth surface body of revolution wall drag-reduction effect, it is characterized in that: adopt following test unit: comprise pond, slide block, guide rail, connecting rod, load-sensing unit, guide rail is arranged on the top in pond, slide block is arranged on guide rail and by roller and can rolls along guide rail, body of revolution wall test model is set in pond, body of revolution wall test model, by connecting rod connection sliding block, arranges transmission rod on connecting rod, load-sensing unit is arranged on transmission rod; Described body of revolution wall test model comprises smooth surface body of revolution wall test model and bionic non-smooth surface body of revolution wall test model;
(1) smooth surface body of revolution wall test model and connecting rod are connected, by transmission rod and load-sensing unit, measure the fluid friction resistance f of smooth surface body of revolution wall test model
s;
(2) change smooth surface body of revolution wall test model into bionic non-smooth surface body of revolution wall test model, repeat the fluid friction resistance f that previous step continues to measure bionic non-smooth surface body of revolution wall test model
n;
(3) drag-reduction effect of bionic non-smooth surface body of revolution wall test model represents with drag reducing efficiency DR: DR=100% * (f
s-f
n) f
s.
5. the test method of assessment bionic non-smooth surface body of revolution wall drag-reduction effect according to claim 4, it is characterized in that: change the angle that connects between water velocity and body of revolution wall model and connecting rod, repeating step (1)～(3), the drag-reduction effect drag reducing efficiency of bionic non-smooth surface body of revolution wall test model while obtaining measuring different in flow rate, the different angle of attack.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954429A (en) * | 2014-04-02 | 2014-07-30 | 西北工业大学 | Lotus leaf stem imitative cylinder around flow drag reduction test model |
| CN106525307A (en) * | 2016-08-04 | 2017-03-22 | 浙江工业大学 | Bionic non-smooth surface friction resistance testing device based on underwater |
| CN106768851A (en) * | 2017-02-21 | 2017-05-31 | 哈尔滨工业大学 | A kind of supercavitating vehicle water tunnel experiment device around head pitching |
| CN108593253A (en) * | 2018-04-20 | 2018-09-28 | 温州大学激光与光电智能制造研究院 | A kind of material surface fluid resistance test method |
| CN108801585A (en) * | 2018-04-20 | 2018-11-13 | 温州大学激光与光电智能制造研究院 | A kind of material surface fluid resistance test device based on laser ranging |
| CN108844714A (en) * | 2018-05-30 | 2018-11-20 | 浙江工业大学 | A kind of the bionic non-smooth surface drag reduction test device and simulator of variable curvature |
| 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 |
| CN117191336A (en) * | 2023-09-12 | 2023-12-08 | 中国船舶科学研究中心 | Flexible epidermis drag reduction efficacy test evaluation method based on flat model |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954429A (en) * | 2014-04-02 | 2014-07-30 | 西北工业大学 | Lotus leaf stem imitative cylinder around flow drag reduction test model |
| CN103954429B (en) * | 2014-04-02 | 2016-06-08 | 西北工业大学 | A kind of imitative lotus leaf bar peripheral flow drag reduction test model |
| CN106525307A (en) * | 2016-08-04 | 2017-03-22 | 浙江工业大学 | Bionic non-smooth surface friction resistance testing device based on underwater |
| CN106525307B (en) * | 2016-08-04 | 2022-05-24 | 浙江工业大学 | Bionic non-smooth surface friction resistance testing device based on underwater |
| CN106768851A (en) * | 2017-02-21 | 2017-05-31 | 哈尔滨工业大学 | A kind of supercavitating vehicle water tunnel experiment device around head pitching |
| CN106768851B (en) * | 2017-02-21 | 2018-11-02 | 哈尔滨工业大学 | A kind of supercavitating vehicle water tunnel experiment device around head pitching |
| CN108801585A (en) * | 2018-04-20 | 2018-11-13 | 温州大学激光与光电智能制造研究院 | A kind of material surface fluid resistance test device based on laser ranging |
| CN108801585B (en) * | 2018-04-20 | 2019-12-10 | 温州大学激光与光电智能制造研究院 | Material surface fluid resistance testing device based on laser ranging |
| CN108593253A (en) * | 2018-04-20 | 2018-09-28 | 温州大学激光与光电智能制造研究院 | A kind of material surface fluid resistance test method |
| CN108844714A (en) * | 2018-05-30 | 2018-11-20 | 浙江工业大学 | A kind of the bionic non-smooth surface drag reduction test device and simulator of variable curvature |
| CN108844714B (en) * | 2018-05-30 | 2023-12-05 | 浙江工业大学 | Variable-curvature bionic non-smooth surface drag reduction testing device and simulation device |
| 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 |
| CN114154246B (en) * | 2021-12-07 | 2023-06-13 | 中国船舶科学研究中心 | Evaluation method for friction resistance reducing efficacy test of rotating cylinder |
| CN117191336A (en) * | 2023-09-12 | 2023-12-08 | 中国船舶科学研究中心 | Flexible epidermis drag reduction efficacy test evaluation method based on flat model |
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Application publication date: 20140319 |