CN105157943A - Method for testing vortex-induced vibration of suspended flexible standpipe based on open channel experiment water tank - Google Patents
Method for testing vortex-induced vibration of suspended flexible standpipe based on open channel experiment water tank Download PDFInfo
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Abstract
The invention relates to a method for testing the vortex-induced vibration of a suspended flexible standpipe based on an open channel experiment water tank. The method employs the open channel experiment water tank and comprises the following steps of: (1) placing an experiment standpipe; (2) constructing a water flow environment of the open channel experiment water tank; (3) placing a testing instrument; (4) testing the velocity profile of a shear flow; and (5) testing the vibration response of the flexible standpipe. The water tank bottom slope, the water flow, the water depth, the velocity profile of the shear flow, the flexible standpipe material and size can be adjusted according to an experiment requirement. The method captures the vibration displacement of a mark point on the flexible standpipe by using two high-speed video cameras so as to achieve non-intervention interference-free flexible standpipe vibration testing under a shear flow velocity profile condition.
Description
Technical field
The invention belongs to vortex-induced vibration of marine riser experiment test technical field, be specifically related to a kind of suspension compliant riser vortex-induced vibration method of testing based on open channel experimental trough.
Background technology
2014, China's oil external dependence degree reached 59.5%, and so large energy breach will inevitably produce important impact to China's economic development and national security.For ensureing the normal operation of China's industrial and agricultural production, defending the national defense safety of China, just must strengthen the exploitation dynamics of hydrocarbon resources.Because Land petroleum resource failure is rapid, in order to improve recovery ratio and increase oil and gas production, onshore oil field enterprise is forced to exploit hypotonic and Oil in Super-low Permeability oil field, marginal oil field, coal-seam gas and shale gas etc., but relevant production technique is ripe not enough, cost of winning is higher, does not obtain the return of expection.
Therefore, we have to sight to be transferred to " blue territory "---on ocean.The pipeline such as marine riser and suspended span delivery pipe must be related in offshore oil and gas exploitation, and along with exploiting the increasing of the depth of water, the length of these pipelines, also in increase, makes their length-diameter ratio increasing, hang in the seawater just as a hairline, seem under the impact of ocean current " weak ".Marine riser is in the marine environment that sea wind, wave and ocean current form jointly, by face wind, wave, the multiple load of stream induced vibration threaten, very easily bring out fatigue damage.
The duty researching and analysing marine riser by experiment can provide reference for scene, but directly carries out experimental study with marine riser prototype, and its cost is high, and has great risk.Existing vortex-induced vibration of marine riser experiment is mainly carried out in circulating water chennel and simulation pond, adopt the vibratory response of the test standpipes such as foil gauge, acceleration transducer, displacement transducer, but these testing tools all need to be arranged on standpipe surface, the Flow Field around standpipe certainly will be changed, thus change the vibratory response of standpipe, cause the data of vibration-testing collection to there is certain deviation.Some testing tool also needs wiring to be energized, riser model is involved many cables, not only affects the normal vibration response of standpipe, also there is electric leakage hidden danger.Therefore, a kind of with low cost, safety and stability, stream field glitch-free riser vortex excited vibration experimental test procedures is needed at present badly.
Summary of the invention
The object of the present invention is to provide a kind of economic security based on open channel experimental trough, non-intervention, glitch-free suspension compliant riser vortex-induced vibration method of testing.
To achieve these goals, the present invention takes following technical scheme: a kind of suspension compliant riser vortex-induced vibration method of testing based on open channel experimental trough, and this method of testing adopts open channel experimental trough, comprises following operation steps:
Step one: arrange experiment standpipe
First, at the gauge point that experiment compliant riser topical oil marking pen label size size is identical.Then, compliant riser is arranged on the vertical longitudinal section of tank middle experiment section, the concave surface making compliant riser just to current come to, one end of compliant riser is adsorbed on bottom of gullet tempered glass by fixing sucking disk, and seals the compliant riser end mouth of pipe by standpipe sealing cap; The other end of compliant riser is connected with angle demodulator, and angle demodulator is fixed on the tank track sled of band lifting rod member.According to the total length of compliant riser and the depth of water height of requirement of experiment, for enabling compliant riser just all be immersed in water, according to the freely-suspended theoretical formula of catenary
With
Calculate horizontal length and the suspension angle, top of compliant riser respectively, then tank track sled is promoted according to horizontal ruler, compliant riser horizontal length is made to reach requirement, the lifting rod member of tank track sled is regulated according to downstream water depth scale, make the vertical height of compliant riser equal depth of water height, and adjust angle demodulator and make suspension angle, top reach requirement.
Wherein: L is compliant riser total length (m), H is depth of water height (m), L
0for compliant riser horizontal length (m), θ is suspension angle, top (°).
Described tank is surrounded by steel structure framework and tempered glass wall, its upstream extremity and reservoir integrally welded, reservoir and tank junction are provided with flashboard.Hydraulic lifting bearing is established below tank downstream end.The longitudinal upper end, two side of tank is provided with slide rail, and slide rail is provided with two tank track sleds, a tank track sled is provided with liftable rod member, and rod member lower end is fixed with angle demodulator; Another tank track sled is provided with liftable knotmeter fixed support, and knotmeter fixed support is that hollow encircles structure.Tank middle experiment section lateral wall is vertical posts upstream, two, downstream depth of water scale, and tank middle experiment section lateral wall coboundary posts a horizontal ruler.Weir plate is established in the outlet of tank downstream end, and weir plate notch geometry is triangle, and weir plate lifting is controlled by weir plate lifter, makes it in the process of lifting, be close to tank, keep VTOL (vertical take off and landing) by limited roller.Tank weir plate outlet below is cistern, and be furnished with water pump in cistern, exit of pump is connected in reservoir the upstream sitting end rectification orifice plate by feed pipe.
Described reservoir is welded by steel sheet material, and reservoir inner chamber centre position is furnished with sits end rectification orifice plate, is provided with band hinged-support below reservoir.
Step 2: the water environment of structure open channel experimental trough
Arrange that at the rear of reservoir inner close fitting flashboard one fills frame, and in wherein placing steel wire lump.Hydraulic lifting bearing below adjustment tank downstream end, makes tank base slope meet the requirements of the gradient.After filling water in cistern, open water pump, make the water in cistern be pumped in reservoir by feed pipe, current tend towards stability after sitting the rectification of end rectification orifice plate.Then, current form shear flow after flowing through and filling frame.Change water pump pump speed and regulating weir plate height, observe depth of water scale, make tank middle water level meet the requirements of regime depth, and check whether compliant riser is just all immersed in water.
Step 3: arrange testing tool
Acoustic Doppler velocimeter is encircled structure installment on tank track sled by the support bracket fastened hollow of knotmeter, promotes tank track sled and be located at upper water deep scaleplate place, to be elevated knotmeter fixed support when testing the speed can carry out height reference.
To look up high-speed camera is arranged on the downside of tank middle experiment section bottom compliant standpipe, for taking the transverse vibration of compliant riser.High-speed camera will be faced and be arranged in tank side just to compliant riser, for taking longitudinal direction and the vertical vibration of compliant riser.Look up high-speed camera and face high-speed camera and be connected with synchronizer trigger, can be triggered by synchronizer trigger and carry out sync pulse jamming.Regulate the depth of field of two high-speed cameras and aperture, make them all can catch the panorama of compliant riser and all gauge points that clear identification compliant riser marks.
Step 4: the velocity profile of test shear flow
The support bracket fastened height of adjustment knotmeter, makes acoustic Doppler velocimeter speed measuring point be positioned at bottom of gullet, from bottom of gullet, measures flow velocity.Then, raise a knotmeter fixed support every 2mm, make acoustic Doppler velocimeter can record the flow velocity of corresponding depth, until survey to the water surface, thus obtain the velocity profile of whole shear flow.
Step 5: the vibratory response of test compliant riser
Start the vibrational image looked up high-speed camera and face high-speed camera sync pulse jamming compliant riser, after recording the sufficiently long time, stop shooting.Carrying out reprocessing analysis by taking the video image obtained, utilizing physical length and its pixel cell shared on image of compliant riser gauge point, picture size can be associated with physical size.Due to video image temporally sequence preservation, by the comparison of the compliant riser gauge point center on every two field picture, gauge point center can be obtained in whole time period intrinsic displacement situation over time.The vibration displacement of comprehensive all gauge points, can obtain the vibration displacement situation over time of whole compliant riser, thus obtains the vibratory response rule of compliant riser under certain shear flow velocity profile condition.
The present invention, owing to adopting above technical scheme, has the following advantages:
1, tank flow of the present invention and the depth of water can regulate as required, can manufacture the ocean current condition of different speed of incoming flow with the suspension compliant riser vortex-induced vibration test under satisfied different operating mode;
2, compliant riser material of the present invention and length, diameter can be selected as required, can meet the compliant riser vortex-induced vibration test of unlike material, different size;
3, tank base slope of the present invention can adjust, and can meet the positive slope of different angles, bear the experiment demand of slope and flat slope;
4, the present invention fills the steel wire lump height of filling in frame and can change as required, with the shear flow velocity profile that satisfied manufacture is different;
5, the gauge point on compliant riser of the present invention can adjust quantity and spacing as required, thus catches the mode of oscillation that is excited of compliant riser more accurately;
6, the present invention adopts non-intervention, glitch-free high-speed camera to catch the method for marker pip displacement, overcomes the vibration-testing defect that foil gauge, acceleration transducer and displacement transducer etc. affect flow field.
Accompanying drawing explanation
Fig. 1 is experimental arrangement front elevation of the present invention
Fig. 2 is experimental arrangement vertical view of the present invention
Wherein: 1, tank; 2, cistern; 3, reservoir; 4, rectification orifice plate; 5, frame is filled; 6, flashboard; 7, hinged-support is with; 8, depth of water scale; 9, horizontal ruler; 10, hydraulic lifting bearing; 11, weir plate lifter; 12, weir plate; 13, limited roller; 14, water pump; 15, feed pipe; 16, tank track sled; 17, knotmeter fixed mount; 18, angle demodulator; 19, fixing sucking disk; 20, standpipe sealing cap; 21, compliant riser; 22, gauge point; 23, acoustic Doppler velocimeter; 24, high-speed camera is looked up; 25, high-speed camera is faced.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
As shown in Figure 1, a kind of suspension compliant riser vortex-induced vibration method of testing based on open channel experimental trough, this method of testing adopts open channel experimental trough, specifically comprises following operation steps:
Step one: arrange experiment standpipe
First, at the gauge point 22 that experiment compliant riser 21 topical oil marking pen label size size is identical.Then, compliant riser 21 is arranged on the vertical longitudinal section of tank 1 middle experiment section, the concave surface making compliant riser 21 just to current come to, one end of compliant riser 21 is adsorbed on bottom tank 1 on tempered glass by fixing sucking disk 19, and seals the compliant riser 21 end mouth of pipe by standpipe sealing cap 20; The other end of compliant riser 21 is connected with angle demodulator 18, and angle demodulator 18 is fixed on the tank track sled 16 of band lifting rod member.According to the total length of compliant riser 21 and the depth of water height of requirement of experiment, can just all be immersed in water, according to the freely-suspended theoretical formula of catenary for making compliant riser 21
with
calculate horizontal length and the suspension angle, top of compliant riser 21 respectively, then tank track sled 16 is promoted according to horizontal ruler 9, compliant riser 21 horizontal length is made to reach requirement, the lifting rod member of tank track sled 16 is regulated according to downstream water depth scale 8, make the vertical height of compliant riser 21 equal depth of water height, and adjust angle demodulator 18 and make suspension angle, top reach requirement.
Wherein: L is compliant riser 21 total length (m), and H is depth of water height (m), L
0for compliant riser 21 horizontal length (m), θ is suspension angle, top (°).
Described tank 1 is surrounded by steel structure framework and tempered glass wall, its upstream extremity and reservoir 3 integrally welded, reservoir 3 and tank 1 junction are provided with flashboard 6.Hydraulic lifting bearing 10 is established below tank 1 downstream end.Upper end, tank 1 longitudinal two side is provided with slide rail, and slide rail is provided with on two tank track sleds, 16, tank track sled 16 and is provided with liftable rod member, rod member lower end is fixed with angle demodulator 18; Another tank track sled 16 is provided with liftable knotmeter fixed support 17, and knotmeter fixed support 17 encircles structure for hollow.Tank 1 middle experiment section lateral wall is vertical posts upstream, two, downstream depth of water scale 8, and tank 1 middle experiment section lateral wall coboundary posts a horizontal ruler 9.Weir plate 12 is established in the outlet of tank 1 downstream end, and weir plate 12 notch geometry is triangle, and weir plate 12 is elevated and is controlled by weir plate lifter 11, makes it in the process of lifting, be close to tank 1, keep VTOL (vertical take off and landing) by limited roller 13.Tank 1 weir plate 12 outlet below is cistern 2, is furnished with water pump 14 in cistern 2, and water pump 14 exports and is connected to by feed pipe 15 upstream sitting end rectification orifice plate 4 in reservoir 3.
Described reservoir 3 is welded by steel sheet material, and reservoir 3 inner chamber centre position is furnished with sits end rectification orifice plate 4, is provided with band hinged-support 7 below reservoir 3.
Step 2: the water environment of structure open channel experimental trough
Arrange that at the rear of reservoir 3 inner close fitting flashboard 6 one fills frame 5, and in wherein placing steel wire lump.Hydraulic lifting bearing 10 below adjustment tank 1 downstream end, makes tank 1 base slope meet the requirements of the gradient.After filling water in cistern 2, open water pump 14, make the water in cistern 2 be pumped in reservoir 3 by feed pipe 15, current tend towards stability after sitting the rectification of end rectification orifice plate 4.Then, current form shear flow after flowing through and filling frame 5.Change water pump 14 pump speed and regulate weir plate 12 height, observe depth of water scale 8, make tank 1 middle water level meet the requirements of regime depth, and check whether compliant riser 21 is just all immersed in water.
Step 3: arrange testing tool
Acoustic Doppler velocimeter 23 is encircled structure installment on tank track sled 16 by the hollow of knotmeter fixed support 17, promote tank track sled 16 and be located at upper water deep scaleplate 8 place, to be elevated knotmeter fixed support 17 when testing the speed can carry out height reference.
To look up high-speed camera 24 is arranged on the downside of tank 1 middle experiment section bottom compliant standpipe 21, for taking the transverse vibration of compliant riser 21.High-speed camera 25 will be faced and be arranged in tank 1 side just to compliant riser 21, for taking longitudinal direction and the vertical vibration of compliant riser 21.Look up high-speed camera 24 and face high-speed camera 25 and be connected with synchronizer trigger, can be triggered by synchronizer trigger and carry out sync pulse jamming.Regulate the depth of field of two high-speed cameras and aperture, make them all can catch the panorama of compliant riser 21 and all gauge points 22 of mark on clear identification compliant riser 21.
Step 4: the velocity profile of test shear flow
The height of adjustment knotmeter fixed support 17, makes acoustic Doppler velocimeter 23 speed measuring point be positioned at bottom tank 1, from bottom tank 1, measures flow velocity.Then, raise a knotmeter fixed support 17 every 2mm, make acoustic Doppler velocimeter 23 can record the flow velocity of corresponding depth, until survey to the water surface, thus obtain the velocity profile of whole shear flow.
Step 5: the vibratory response of test compliant riser
Start the vibrational image looked up high-speed camera 24 and face high-speed camera 25 sync pulse jamming compliant riser 21, after recording the sufficiently long time, stop shooting.Carrying out reprocessing analysis by taking the video image obtained, utilizing physical length and its pixel cell shared on image of compliant riser 21 gauge point 22, picture size can be associated with physical size.Due to video image temporally sequence preservation, by the comparison of compliant riser 21 gauge point 22 center on every two field picture, gauge point 22 center can be obtained in whole time period intrinsic displacement situation over time.The vibration displacement of comprehensive all gauge points 22, can obtain the vibration displacement situation over time of whole compliant riser 21, thus obtains the vibratory response rule of compliant riser 21 under certain shear flow velocity profile condition.
Claims (1)
1., based on a suspension compliant riser vortex-induced vibration method of testing for open channel experimental trough, it is characterized in that this method of testing adopts open channel experimental trough, comprise the steps:
Step one: arrange experiment standpipe
First, at the gauge point (22) that experiment compliant riser (21) topical oil marking pen label size size is identical; Then, compliant riser (21) is arranged on the vertical longitudinal section of tank (1) middle experiment section, the concave surface making compliant riser (21) just to current come to, one end of compliant riser (21) is adsorbed on the tempered glass of tank (1) bottom by fixing sucking disk (19), and seals compliant riser (21) the end mouth of pipe by standpipe sealing cap (20); The other end of compliant riser (21) is connected with angle demodulator (18), and angle demodulator (18) is fixed on the tank track sled (16) of band lifting rod member; According to the total length of compliant riser (21) and the depth of water height of requirement of experiment, can just all be immersed in water, according to the freely-suspended theoretical formula of catenary for making compliant riser (21)
With
Calculate horizontal length and the suspension angle, top of compliant riser (21) respectively, then tank track sled (16) is promoted according to horizontal ruler (9), compliant riser (21) horizontal length is made to reach requirement, the lifting rod member of tank track sled (16) is regulated according to downstream water depth scale (8), make the vertical height of compliant riser (21) equal depth of water height, and adjust angle demodulator (18) and make suspension angle, top reach requirement;
Wherein: L is compliant riser (21) total length (m), and H is depth of water height (m), L
0for compliant riser (21) horizontal length (m), θ is suspension angle, top (°);
Described tank (1) is surrounded by steel structure framework and tempered glass wall, its upstream extremity and reservoir (3) integrally welded, reservoir (3) and tank 1 junction are provided with flashboard (6); Hydraulic lifting bearing (10) is established below tank (1) downstream end; Upper end, tank (1) longitudinal two side is provided with slide rail, slide rail is provided with two tank track sleds (16), a tank track sled (16) is provided with liftable rod member, and rod member lower end is fixed with angle demodulator (18); Another tank track sled (16) is provided with liftable knotmeter fixed support (17), and knotmeter fixed support (17) encircles structure for hollow; Tank (1) middle experiment section lateral wall is vertical posts upstream, two, downstream depth of water scale (8), and tank (1) middle experiment section lateral wall coboundary posts a horizontal ruler (9); Weir plate (12) is established in the outlet of tank (1) downstream end, weir plate (12) notch geometry is triangle, weir plate (12) lifting is controlled by weir plate lifter (11), make it in the process of lifting, be close to tank (1) by limited roller (13), keep VTOL (vertical take off and landing); Tank (1) weir plate (12) outlet below is cistern (2), be furnished with water pump (14) in cistern (2), water pump (14) outlet is connected to the upstream sitting end rectification orifice plate (4) in reservoir (3) by feed pipe (15);
Described reservoir (3) is welded by steel sheet material, and reservoir (3) inner chamber centre position is furnished with sits end rectification orifice plate (4), and reservoir (3) below is provided with band hinged-support (7);
Step 2: the water environment of structure open channel experimental trough
Arrange that at the rear of reservoir (3) inner close fitting flashboard (6) one fills frame (5), and in wherein placing steel wire lump; Hydraulic lifting bearing (10) below adjustment tank (1) downstream end, makes tank (1) base slope meet the requirements of the gradient; Water pump (14) is opened after filling water in cistern (2), make the water in cistern (2) be pumped in reservoir (3) by feed pipe (15), current tend towards stability after sitting end rectification orifice plate (4) rectification; Then, current flow through fill frame (5) form shear flow afterwards; Change water pump (14) pump speed and regulate weir plate (12) highly, observe depth of water scale (8), make tank (1) middle water level meet the requirements of regime depth, and check whether compliant riser (21) is just all immersed in water;
Step 3: arrange testing tool
Acoustic Doppler velocimeter (23) is encircled structure installment on tank track sled (16) by the hollow of knotmeter fixed support (17), promote tank track sled (16) and be located at upper water deep scaleplate (8) place, to be elevated knotmeter fixed support (17) when testing the speed can carry out height reference;
High-speed camera (24) will be looked up and be arranged in tank (1) middle experiment section bottom compliant standpipe (21) downside, for taking the transverse vibration of compliant riser (21); High-speed camera (25) will be faced and be arranged in tank (1) side just to compliant riser (21), for taking longitudinal direction and the vertical vibration of compliant riser (21); Look up high-speed camera (24) and face high-speed camera (25) and be connected with synchronizer trigger, can be triggered by synchronizer trigger and carry out sync pulse jamming; Regulate the depth of field and the aperture of two high-speed cameras, make them all can catch the panorama of compliant riser (21) and all gauge points (22) of the upper mark of clear identification compliant riser (21);
Step 4: the velocity profile of test shear flow
The height of adjustment knotmeter fixed support (17), makes acoustic Doppler velocimeter (23) speed measuring point be positioned at tank (1) bottom, from tank (1) bottom, measures flow velocity; Then, raise a knotmeter fixed support (17) every 2mm, make acoustic Doppler velocimeter (23) that the flow velocity of corresponding depth can be recorded, until survey to the water surface, thus obtain the velocity profile of whole shear flow;
Step 5: the vibratory response of test compliant riser
Start the vibrational image looked up high-speed camera (24) and face high-speed camera (25) sync pulse jamming compliant riser (21), after recording the sufficiently long time, stop shooting; Carrying out reprocessing analysis by taking the video image obtained, utilizing physical length and its pixel cell shared on image of compliant riser (21) gauge point (22), picture size can be associated with physical size; Due to video image temporally sequence preservation, by the comparison of compliant riser (21) gauge point (22) center on every two field picture, gauge point (22) center can be obtained in whole time period intrinsic displacement situation over time; The vibration displacement of comprehensive all gauge points (22), the vibration displacement situation over time of whole compliant riser (21) can be obtained, thus obtain the vibratory response rule of compliant riser (21) under certain shear flow velocity profile condition.
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