38results about How to "Improve drag reduction efficiency" patented technology

A drag reduction superhydrophobic coating and a preparation method thereof belong to the technical field of functional nanometer material application. A base of the drag reduction superhydrophobic coating adopts electroless metal deposition technique, a precious metal micro-nanometer binary grading composite structure is constructed on the base and decorated by a low surface energy material, a water static contact angle of the coating is larger than 150 degrees, and a rolling angle is smaller than 5 degrees. The drag reduction superhydrophobic coating is used for a model with motive power by itself, running speed of the model is obviously increased, and drag reduction rate is as high as 20%. The drag reduction superhydrophobic coating has good corrosivity resistance and can resist corrosion of strong acid and strong base solutions. The drag reduction superhydrophobic coating has repairability, and the preparation method can enable hydrophobicity of damaged areas to be rapidly recovered in a short period. The preparation method of the drag reduction superhydrophobic coating is simple, short in preparation period, and high in drag reduction rate.

The invention provides a production method of a bionic super-hydrophobic surface, and a method for carrying out underwater drag reduction by using the hydrophobic interface. A bionic technology is combined with a supercavity drag reduction technology, so the underwater drag reduction efficiency is effectively improved, and the production cost and the maintaining cost are low; and raw materials adopted in the invention are nontoxic and have no radiation effect, so the bionic super-hydrophobic surface has no untoward effects on environment.

The invention discloses a deep well resistance-reducing packing which mainly comprises the following components in parts by weight: 10-50 parts of conducting materials, 10-50 parts of curing agent, 0.5-25 parts of leavening agent and 0.1-10 parts of retarding agent, wherein the conducting material is selected from one or more of sodium salts, potassium chloride, calcium chloride and graphite; the curing agent is selected from one or more of polyvinyl alcohol, aluminosilicate (kaolin), sodium silicate, calcium sulfate and cement; the leavening agent is selected from one of polyacrylamide and bentonite; and the retarding agent is selected from one of sodium methylenebisnaphthalenesulfonate and peregal. The deep well resistance-reducing packing has the advantages of saving of 15-30 percent of water quantity, good peaceability with water, no demixing and convenience for site configuration and construction: in addition, no demixing is caused, the solidifying time is prolonged and the flowability and the permeability are enhanced, therefore, no bridging phenomenon is caused during pouring, resistance reduction efficiency is increased, the quantity of deep wells is reduced, and the construction cost is reduced.

The invention relates to a micro-bubble pipeline drag reduction method. Micro-bubbles are directly generated in a transition layer of a turbulent flow field in a pipeline through electrolysis by an electrolytic ring, the micro-bubbles interact with turbulent flows in the transition layer of the flow field, turbulent flow fluctuation is inhibited, and flowing turbulent flow drag reduction is realized. A micro-bubble drag-reduced pipeline comprises a pipeline body, wherein the section of the pipeline body adopts a rectangular structure, a two-dimensional groove channel is formed in the pipeline of the pipeline body, two ends of the two-dimensional groove channel are connected with the rectangular pipeline body respectively in a sealed manner, the electrolytic ring is arranged in the two-dimensional groove channel and adopts a rectangular frame structure, the electrolytic ring is fixedly arranged in a transition layer area in the two-dimensional groove channel, and a lead of the electrolytic ring extends out of the two-dimensional groove channel to be connected with a power supply. By the aid of interaction of the micro-bubbles and the turbulent flows in the transition layer, the turbulent flow fluctuation is inhibited, the flowing turbulent flow drag reduction is realized, the frictional drag in a liquid pipeline delivery process is reduced, the drag reduction efficiency is improved, unnecessary waste is reduced, and the delivery speed of a fluid is increased as far as possible under the same micro-bubble air quantity.

The invention provides a preparation method for a device which can electrolyze water to prepare hydrogen in the moving process and a method for conducting underwater resistance reducing by adopting hydrogen microbubbles generated by the device. Through the microbubble resistance reducing technology, the resistance of the device when moving underwater is effectively reduced, and manufacturing and implementation are easy. Raw materials used in the preparation process are all free of poison and have no radiation effect, the bubbles are mainly generated in the resistance reducing process, and no adverse effect exists on the environment.

The invention relates to a high-speed sailing vehicle combining a micro-bubble drag reduction technology and a groove surface turbulence drag reduction technology. The high-speed sailing vehicle is characterized in that a plurality of parallel grooves which are parallel to each other are formed in the bottom surface of a ship body in the length direction of the ship body, the cross sections of thegrooves are square, U-shaped or V-shaped, the groove height hc of the grooves is equal to the width W of the grooves, the high-speed sailing vehicle further comprises a micro-bubble generation devicearranged inside a cabin, the micro-bubble generation device generates air bubbles and conveys the air bubbles to the bottom of the ship body through air pipes, the air pipes are laid inside the grooves, and exhaust holes are uniformly formed in the length direction of the grooves. According to the high-speed sailing vehicle, the grooves are designed at the bottom of the ship body, and the purposeof reducing the resistance is achieved by changing the flowing structure of the bottom layer of the boundary layer; and meanwhile, the exhaust holes are formed in the grooves, and the bubbles are discharged out of the surfaces of the grooves to generate a dispersed fine air curtain so that the resistance can be further reduced, the combined drag reduction effect can be achieved through the effective combination of the two drag reduction technologies, the drag reduction efficiency is improved, and then the rapidity of the sailing vehicle is improved.

The invention provides a drag reducer, and a preparation method and an application thereof. The drag reducer has a high drag reduction efficiency; the carrier component of the drag reducer can effectively avoid the phenomena of breakage and the like of the macromolecular chain of an alpha-olefin polymer in the use process; and glyceryl trioleate and glyceryl trilinoleate also added to the drag reducer as carriers can assist in achieving the drag reduction effect, and the carriers also avoid the phenomena of layering or caking of the drag reducer in the storage process, so the blocking phenomenon is avoided. The drag reducer is a green and environmentally-friendly drag reducer, and the added carrier components are mild reagents, so compared with other drag reducers, the prepared drag reducer has no pungent smell, and is popular with operators. Moreover, the drag reducer has a wide application range, is suitable for crude oils and mixed crude oils with various densities, and is also suitable for product oils with high requirements for additives.

The invention discloses an alpha-olefin-styrene super molecular weight drag-reduction polymers for petroleum pipelines and process for preparing the same, wherein alpha-olefin 80-99.9% of the total raw material weight and 0.1-20 wt% of phenylethene are sufficiently mixed, so thin film is formed in the reaction device isolated from air, then 0.002-0.11 wt% of Ziegler-Natta catalyst is distributed uniformly onto the thin film, the reaction temperature is controlled to trigger bulk polymerization reaction.

The ship drag reduction system comprises an incident flow liquid spraying device, an air spraying device, a high-pressure pump and a control device, the incident flow liquid spraying device is installed at the head of a ship and arranged along the middle longitudinal section of the ship, the high-pressure pump is installed at the bottom of the head of the ship, and the incident flow liquid spraying device is located on one side of the high-pressure pump and connected with the high-pressure pump; the air injection device is arranged on the other opposite side of the high-pressure pump and connected with the high-pressure pump, the air injection device is arranged at the bottom and the two opposite sides of the stem in a U shape, and the control device is installed on the ship and connected with the high-pressure pump in a signal mode. The head incident flow resistance reduction device sprays water at the front edge of the ship in an incident flow mode, so that the high-pressure area of the front edge of the ship can be improved, the viscous pressure resistance of the ship is reduced, the resistance reduction mode can be selected according to the advancing speed of the ship, the spraying speed of the resistance reduction device can be controlled, the defect that a traditional resistance reduction mode is single is overcome, and the resistance reduction efficiency is improved; and the gas-liquid dual-purpose high-pressure pump is adopted to generate high-pressure water flow and bubbles, the installation difficulty of the resistance reduction device is reduced, and installation is convenient.

The invention discloses a resistance reduction device based on negative pressure type sliding plasma discharge. The resistance reduction device comprises a mounting flat plate, and a plurality of plasma discharge units arranged in a gapless array are mounted on the mounting flat plate; each plasma discharge unit comprises a regular hexagonal tubular dielectric layer, an alternating current electrode and a pulse direct current electrode are arranged along the surface of the inner wall of a regular hexagonal tubular dielectric layer, and a buried electrode is buried in the corresponding regular hexagonal tubular dielectric layer between the alternating current electrode and the pulse direct current electrode; the buried electrodes, the alternating current electrodes and the pulse direct current electrodes are all in a regular hexagonal tube shape; and the plurality of buried electrodes on the mounting panel are connected in parallel and then grounded, the plurality of alternating current electrodes on the mounting panel are connected in parallel and then connected with an alternating current high-voltage power supply, and a plurality of pulse direct current electrodes on the mounting panel are connected in parallel and then connected with a pulse high-voltage direct-current power supply. The device can remarkably improve the flow control effect and achieve the purpose of turbulent flow resistance reduction.