Active resistance reducing device for pipeline fluid

Abstract

The utility model provides an active resistance reducing device for pipeline fluid, which comprises a pipeline, a fluid inlet pipe, a fluid outlet pipe and a fluid outlet pipe, and the pulse exciter is used for generating disturbance on turbulent fluid in the pipeline, is arranged on the pipeline and covers the jet flow gap channel, and a sealing structure is arranged between the pulse exciter and the jet flow gap channel. Friction resistance can be further reduced by changing the flowing state in the pipeline, and therefore the bottleneck of existing passive control is broken through.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid drag reduction, and in particular relates to an active drag reduction device for pipeline fluid. Background Art

[0002] The flow of fluid in the pipeline is common in the pipeline transportation process of various liquids, gases and complex mixtures. Due to the viscosity of the fluid itself and the no-slip boundary of the pipeline wall, the fluid in the pipeline will produce a velocity gradient near the wall during transportation, which in turn produces surface friction resistance, seriously increasing the energy loss and transportation cost in the pipeline transportation of the fluid. The fluid in the pipe can be divided into laminar flow and turbulent flow according to the flow state. Compared with turbulent flow, the velocity gradient of laminar flow near the wall is lower, and the surface friction generated is also correspondingly lower. It can be seen that promoting the conversion of the fluid in the pipeline from turbulent flow to laminar flow can greatly reduce the friction resistance of the pipeline, thereby reducing the pipeline transportation cost of the fluid and improving the economy of pipeline transportation. It has great practical value and a wide range of applications.

[0003] Existing methods for reducing drag of pipeline fluids mainly include passive control methods such as smoothing the pipeline surface and changing the flow channel shape. However, these methods do not fundamentally change the movement state of the fluid, and the drag reduction effect obtained is often very limited. In addition, it is difficult to further reduce friction resistance after the pipeline is smoothed to a certain degree or the flow channel shape is optimized to the limit. Summary of the invention

[0004] The purpose of this utility model is to provide an active drag reduction device for pipeline fluid, which can further reduce friction resistance by changing the flow state in the pipeline, thereby breaking through the bottleneck of existing passive control. The technical solution adopted is as follows:

[0005] A pipeline fluid active drag reduction device, comprising:

[0006] A pipe 2, on which a jet slot 3 is provided;

[0007] The pulse exciter 1 is used to generate disturbance to the turbulent fluid in the pipeline 2. It is arranged in the pipeline 2 and covers the jet slot 3. A sealing structure is arranged between the pulse exciter 1 and the jet slot 3.

[0008] Preferably, the output of the pulse exciter 1 is a pulse jet, a pressure wave and a wavy induced airflow.

[0009] Preferably, the jet slot 3 extends along the circumference of the pipe 2, and includes a plurality of discontinuous sub-slots.

[0010] Preferably, the pulse exciter 1 is sleeved on the pipe 2 and threadedly connected thereto.

[0011] Preferably, the pulse exciter 1 is a device capable of generating a pulse jet.

[0012] Preferably, the width of the jet slot 3 is between one percent and one tenth of the diameter of the pipeline 2, and the excitation frequency range of the pulse exciter 1 is: 0.1 Hz ~ 100 kHz.

[0013] Preferably, the pulse exciter 1 comprises: a vibration part 5, a cavity 4, and a slot 41;

[0014] A slot 41 is formed at a position where the cavity 4 contacts the jet slot 3;

[0015] The vibration part 5 is fixed to the outer wall of the cavity 4 .

[0016] Preferably, a first flange and a second flange are respectively provided at both ends of the pipeline 2, and the first flange and the second flange are both used to connect to a fluid transport pipeline.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] 1. Reduce pipeline friction resistance: Traditional pipeline drag reduction methods have reached a bottleneck, and the utility model can further reduce the friction resistance generated by the fluid in the pipeline through pulse jets, thereby reducing the energy consumption of pipeline transportation, which is crucial to reducing transportation costs.

[0019] 2. No need to change the shape of the pipeline: the utility model only needs to install a pulse jet exciter on the outside of the pipeline and connect it to the pipeline through the jet slit, so there is no need to make large-scale modifications to the shape of the pipeline.

[0020] 3. Compact structure and easy installation and application: The device of the utility model has a compact structure and small size. It can be installed on the outside of various pipelines and is easy to use in different environments and working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the pipeline fluid active drag reducing device of this embodiment.

[0022] Figure 2 It is a structural diagram of the pulse exciter in this embodiment.

[0023] Among them, 1-pulse exciter, 2-pipeline, 3-jet slot, 4-cavity, 41-slot, 5-vibration part. DETAILED DESCRIPTION

[0024] The following will be described in more detail with reference to the schematic diagram of the present invention, wherein the preferred embodiment of the present invention is shown, and it should be understood that the present invention described herein can be modified by a person skilled in the art, while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to a person skilled in the art, and not as a limitation to the present invention.

[0025] An active drag reduction device for pipeline fluid generates favorable disturbances to the fluid in the turbulent state during pipeline transportation through a pulse exciter, thereby inducing the fluid in the pipeline to transform from a turbulent state to a laminar flow. Since the wall friction resistance coefficient caused by pipeline flow in a laminar state is much lower than that in a turbulent state, the utility model can greatly reduce the resistance and energy loss caused by the fluid in the pipeline, thereby providing a new solution for reducing the energy consumption and cost of fluid pipeline transportation.

[0026] The specific structure is as follows:

[0027] The pipeline 2 has a jet slot 3 formed thereon. The two ends of the pipeline 2 are respectively provided with a first flange and a second flange, and the first flange and the second flange are both used to connect the fluid transport pipeline.

[0028] The pulse exciter 1 is used to generate disturbance to the turbulent fluid in the pipeline 2. It is arranged in the pipeline 2 and covers the jet slot 3. A sealing structure is arranged between the pulse exciter 1 and the jet slot 3.

[0029] The output of the pulse exciter 1 is a pulse jet, a pressure wave and a wave-shaped induced airflow. The pulse exciter 1 is any device that can generate a pulse jet.

[0030] like Figure 1 As shown, the jet slot 3 extends along the circumference of the pipe 2, and includes a plurality of discontinuous sub-slots. The pulse exciter 1 is sleeved on the pipe 2 and is threadedly connected thereto.

[0031] Furthermore, when the width of the jet slot 3 is between 1% and 10% of the pipe diameter and the excitation frequency of the pulse exciter 1 is between 0.1 Hz and 100 kHz, the drag reduction effect is optimal and can be measured by detecting the resistance coefficient of the pipe or the pressure used to drive the pipe fluid.

[0032] In this example, the sealing structure is a rubber ring.

[0033] The working principle of the pipeline fluid active drag reduction device:

[0034] After the device is installed, the pulse exciter 1 generates a series of sound wave vibrations, which pass through the sealing structure and the jet slit 3 and enter the pipe 2 to generate pulse jets and induced wavy airflow, thereby disturbing the turbulent fluid in the pipe 2.

[0035] The pulse jet interacts with the turbulent structure and cancels it out, thus causing the turbulent structure to transform into a laminar structure, ultimately achieving the goal of reducing frictional resistance.

[0036] Furthermore, the structure of the pulse exciter 1 is improved to form the pulse exciter in this embodiment.

[0037] Specifically, Figure 2 As shown, the pulse exciter 1 includes: a vibration part 5 , a cavity 4 and a slot 41 .

[0038] The vibration part 5 is a speaker, a compression driver, a vibration membrane, a piston, a plasma or any other device that can generate vibration.

[0039] Due to the design of the geometric structure, the cavity 4 and the slot 41 constitute a Helmholtz resonator. By designing the geometric structure of the cavity 4 and the slot 41, the Helmholtz resonance effect can be used to amplify the pulse jet intensity at a required frequency, thereby improving the working efficiency of the pulse exciter.

[0040] The pipeline fluid active drag reduction device can be widely used in the field of drag reduction control in various pipeline transportations, including but not limited to water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial installations.

[0041] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, may make any equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which shall be deemed as the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A pipeline fluid active drag reduction device, characterized in that: include: A pipe (2) having a jet channel (3) formed thereon; The pulse exciter (1) is used to generate disturbances on the turbulent fluid in the pipeline (2), and is arranged in the pipeline (2) and covers the jet slot (3). A sealing structure is arranged between the pulse exciter (1) and the jet slot (3).

2. The pipeline fluid active drag reduction device according to claim 1, characterized in that: The output of the pulse exciter (1) is a pulse jet, a pressure wave and a wavy induced airflow.

3. The pipeline fluid active drag reduction device according to claim 1, characterized in that: The jet slot (3) extends along the circumference of the pipeline (2), and comprises a plurality of discontinuous sub-slots.

4. The pipeline fluid active drag reduction device according to claim 3, characterized in that: The pulse exciter (1) is sleeved on the pipeline (2) and threadedly connected thereto.

5. The pipeline fluid active drag reduction device according to claim 4, characterized in that: The pulse exciter (1) is a device capable of generating a pulse jet.

6. The pipeline fluid active drag reduction device according to claim 1, characterized in that: The width of the jet slot (3) is between one percent and one tenth of the diameter of the pipeline (2), and the excitation frequency range of the pulse exciter (1) is 0.1 Hz to 100 kHz.

7. The pipeline fluid active drag reduction device according to claim 1, characterized in that: The pulse exciter (1) comprises: a vibration part (5), a cavity (4), and a slot (41); A slot (41) is provided at a position where the cavity (4) contacts the jet slot (3); The vibration part (5) is fixed to the outer wall of the cavity (4).

8. The pipeline fluid active drag reduction device according to claim 1, characterized in that: The two ends of the pipeline (2) are respectively provided with a first flange and a second flange, and the first flange and the second flange are both used to connect to a fluid transport pipeline.

Images