CN103953818A

CN103953818A - Different-diameter anti-drag pipeline

Info

Publication number: CN103953818A
Application number: CN201410134639.9A
Authority: CN
Inventors: 段乐乐; 刘宜军; 宋思宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-03
Filing date: 2014-04-03
Publication date: 2014-07-30
Anticipated expiration: 2034-04-03
Also published as: CN103953818B

Abstract

The invention relates to a different-diameter anti-drag pipeline which is formed by a thick pipeline, a thin pipeline and a machine wing; the thick pipeline and the thin pipeline are cylindrical; the machine wing is annular and has an arc line at the outside of the longitudinal section and a straight line at the inside surface. According to the irregular diameter anti-drag pipeline, the local resistance applied to fluid when the fluid flows into a small-diameter pipeline from a large-diameter pipeline is reduced, the anti-drag effect is obvious, the possibility of the local damage to the pipeline is effectively reduced, and the different-diameter anti-drag pipeline is convenient to machine and fix and convenient for usage in wide range.

Description

Reducing drag reduction pipe

Technical field

The present invention relates to a kind of pipeline, especially a kind of reducing drag reduction pipe.

Background technique

The various traffic tool must consume mass energy and overcome the resistance of air, water or other fluid in running.According to the statistics of 2006, only sea transport industry in the whole world approximately will consume 2,100,000,000 barrels of oil every year, discharged 1,000,000,000 tons of carbon dioxide, and the annual fuel consuming of aviation industry, also 1,500,000,000 barrels of left and right, therefore reduces fluid resistance significant to energy-saving and emission-reduction.

As far back as people's drag reduction that just begins one's study thirties in 20th century, and make progress very rapid, up to now, people have developed many kinds of drag reduction technologies, as drag reduction by riblets, Friction Reduction by Micro-bubbles, coating drag reduction, Wall Vibration drag reduction, Drag Reduction With Additives, associating drag reduction etc., and obtain some and successfully applied.But due to the complexity of fluid motion, the drag reduction mechanism of many drag reduction technologies still imperfectly understands, drag reduction theoretical research also needs further to improve and development, although people have proposed considerable drag reduction scheme at present in addition, but can conveniently be applied to reality and obtain the actually rare of higher drag-reduction effect, be necessary further to open up thinking, develop new drag reduction technology.The energy loss of pipeline mainly concentrates on on-way resistance and local resistance, for on-way resistance, drag reduction technology is full-fledged at present, and the cost that changes on-way resistance is also larger, and all kinds of annexes of industrial pipeline, as valve, bend pipe, turnout sudden enlargement or dwindle pipe, all can produce a lot of local head losses.If can find the method that reduces local resistance, reduce the resistance of even eliminating all kinds of annexes, will produce very large drag-reduction energy-saving effect to pipeline transport.

Summary of the invention

In order to overcome the deficiency of above-mentioned existing product, the object of the present invention is to provide a kind of reducing drag reduction pipe, it adopts and is provided with an annular wing in extra heavy pipe road and thin pipe joint.

In order to realize the technological scheme that object of the present invention adopts be: a kind of reducing drag reduction pipe, is characterized in that: it is made up of extra heavy pipe road, thin pipe, wing; Described extra heavy pipe road and thin pipe are cylindrical; Described wing is annular, and longitudinal section outside is camber line, and inner side surface is straight line, and wing is fixed on extra heavy pipe road and inside, thin pipe joint, becomes 40 degree angles with pipe centerline.

The invention has the beneficial effects as follows: suffered local resistance can reduce fluid and flow to small diameter pipeline from large-diameter pipeline time, drag-reduction effect is obvious, effectively reduces the possibility of pipeline local damage, and processing convenient fixing, is convenient to use on a large scale.

Brief description of the drawings

Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.

Fig. 1 is structural drawing of the present invention

Fig. 2 is sectional view of the present invention

Fig. 3 is side view sectional view of the present invention

1-extra heavy pipe road, 2-thin pipe, 3-wing in figure.

Embodiment

In the first embodiment shown in Fig. 1, Fig. 2, Fig. 3, a kind of reducing drag reduction pipe, is characterized in that: it is made up of extra heavy pipe road, thin pipe, wing; Described extra heavy pipe road and thin pipe are cylindrical; Described wing is annular, and longitudinal section outside is camber line, and inner side surface is straight line.

In the second embodiment shown in Fig. 1, Fig. 2, Fig. 3, described thin pipe is connected with thick pipeline end face center, is used for carrying various fluids, is convenient to the conveying of fluid, described wing is fixed on extra heavy pipe road and inside, thin pipe joint, become 40 degree angles with pipe centerline, show through Fluent simulation analysis and model test, the annular wing angle of attack is 40 the bests of drag-reduction effect while spending, fluid is subject to two kinds of resistances when mobile: on-way resistance and local resistance, in industrial production and daily life, all kinds of annexes often can be installed in pipeline, fluid is in the time that pipe diameter dwindles suddenly, can be destroyed, cause the sharply variation of velocity flow profile, produce whirlpool, thereby form profile drag and surface friction drag, it is local resistance, produce thus local head loss, reduce the larger local resistance that fluid is subject in the time that the larger pipeline of diameter flows to the less pipeline of diameter, thereby the knowledge that the internal pressure of utilizing wing can produce lift change fluid field distributes, add cycle object that a tangent plane is wing shapes to change flow field internal pressure distribution situation in the connecting part of large-diameter pipeline and small diameter pipeline, reach the object that reduces local resistance, the inner side surface of wing is similar to straight line, outer side surface is camber line, when flowing through wing, fluid can produce resistance and lift, its principle that produces lift can be explained by Newton's third law and Bernoulli's law, in a fluid system, flow velocity is faster, the pressure that fluid produces is just larger, camber line one side of wing is farther compared with straight line one dypass journey, so speed when fluid flows through wing outer side surface is larger, be less than the pressure of inner side surface according to the known wing outer side surface of Bernoulli's law pressure, the pressure distribution of utilizing this pressure difference to change pipeline to dwindle suddenly place, the formation that as far as possible reduces whirlpool does not even produce whirlpool, to reduce local resistance, table one is the contrast of Fluent simulation result, table two is the contrast of model test result:

Wall resistance	Add wing	Do not add wing
			Wall1	0.116589	0.110112
Wall2	-0.94672	-0.48380
			Wall3	0.700307	0.611601
Wing1	0.001392	/
			Wing2	-0.19709	/
Wing3	0.446592	/
			Total	0.121061	0.237911

The contrast of table one pipe resistance result

V(m/s)	Drag reduction value (kg)	Pipe interior resistance (kg) in Ansys	Drag-reduction effect
				0.2	0.0013	0.01266	10.27%
0.4	0.0024	0.02564	9.36%
				0.6	0.0028	0.02860	9.79%
0.8	0.0056	0.06081	9.21%
				1.0	0.0092	0.09710	9.47%
1.2	0.0088	0.08932	9.85%
				1.6	0.0346	0.3457	10.01%
2.0	0.0521	0.5461	9.54%
				2.4	0.0661	0.6663	9.92%

Drag-reduction effect contrast when table two friction speed

Because wing outer side surface is camber line, inner side surface near linear, when fluid is flowed through airfoil outer, speed is large, pressure is little, and when the wing of flowing through is inner, speed is little, and pressure is large, make wing inside and outside produce pressure difference, pressure difference is born by wing, and the suffered pressure of thickness pipeline junction is reduced, and prevents that fluid from crushing the tube wall of thickness pipeline junction.

Use time of the present invention, wing is fixed on to the place of the local cracky of the inner and various delivering pipe in extra heavy pipe road and thin pipe joint, just can play local drag-reduction effect.

Claims

1. a reducing drag reduction pipe, is characterized in that: it is made up of extra heavy pipe road, thin pipe, wing; Described extra heavy pipe road and thin pipe are cylindrical; Described wing is annular, and longitudinal section outside is camber line, and inner side surface is straight line, and wing is fixed on extra heavy pipe road and inside, thin pipe joint, becomes 40 degree angles with pipe centerline.

2. reducing drag reduction pipe according to claim 1, is characterized in that: described thin pipe is connected with thick pipeline end face center.