443results about "Fluid dynamics" patented technology

A clampless synthetic jet actuator includes a cavity layer having an internal cavity for reception of a fluid volume and an orifice providing a fluid communication between the cavity and an external atmosphere; and an oscillatory membrane having a piezoelectric material adapted to deflect the oscillatory membrane in response to an electrical signal. The cavity has an opening in at least one planar surface of the cavity layer, and the cavity layer and the oscillatory membrane are joined by a high strength, low shear modulus adhesive material with the oscillatory membrane positioned adjacent to the planar surface having the cavity opening and adapted as an enclosing surface to said cavity opening. The oscillatory membrane is adapted to compress and expand a volume within the cavity, based on a deflection generated by the piezoelectric material, for generating a fluid flow between the cavity and the external atmosphere through the orifice.

The present application relates to a flow equalizing device. The flow equalizing device comprises a pipeline (110) and at least two blades (101), wherein the pipeline (110) is cylindrical and has a central axis, the at least two blades (101) are arranged in the pipeline (110), and the at least two blades (101) are arranged along a helical line around the central axis, such that a fluid in the pipeline (110) can be divided into at least two streams of fluid to flow in a helical direction on the cross section of the pipeline (110). The at least two blades (101) are spaced apart from an inner wall of the pipeline (110) and / or the at least two blades (101) are provided with through holes, thereby forming a gap on the cross section of the pipeline, such that the at least two streams of fluid can circulate through the gap. The flow equalizing device of the present application can uniformly distribute a fluid in a circumferential direction of the pipeline, thereby equalizing flow.

A structure (1) for channelling and directing incident wind is described. The structure includes a hollow pipe (2) having a downstream end (2a) that defines at least one outlet and an upstream end (2b). A rotatably mounted intake (4) is positioned at the upstream end (2b) of the pipe (2) and is adapted to direct incident wind into the pipe.

Example systems and methods for using multi-directional baffles in cryogenic fuel tanks are provided. An example cryogenic fuel tank comprises an inner surface defining an interior of the cryogenic fuel tank to hold a fuel and a plurality of baffles including a first baffle, the first baffle including a first member extending along a first plane and a second member extending along a second plane, the first plane different from the second plane, the second member connected to the first member, the plurality of baffles connected to the inner surface.

The invention belongs to the technical field of petroleum storage, and particularly relates to a shockproof storage pressure container for liquefied petroleum gas. Comprising a pressure tank, multiple columns of partition plates are arranged in the pressure tank, and first through holes transversely penetrate through the bottom ends of the partition plates; a blocking assembly is arranged in the partition plate, the output end of the blocking assembly moves in the vertical direction to block the first through hole, the pressure tank is divided into a plurality of compartments used for containing liquefied petroleum gas, and the effect of rapidly separating and containing liquefied petroleum gas fluid is achieved; a floating plate perpendicular to the partition plate is further arranged in the pressure tank, the partition plate penetrates through the floating plate, the floating plate ascends and descends along with the liquid level of the liquefied petroleum gas and is fixed through a limiting assembly to limit shaking of the liquid level, and stable transportation of petroleum is guaranteed.

The present invention describes a turbulent flow promoting surface, intended to improve the aeration of fluids, namely of water. The equipment of the present invention comprises a surface, which may or may not be the surface of any apparatus used in the aeration of fluids, which comprises promoters (2) that promote turbulent flow of fluid. The promoters (2) comprise a protuberance (2.1) integrating a cavity (2.1.1) and an edge (2.1.2) responsible for dividing the stream of the fluid in two streams, one of which goes into the cavity (2.1.1) through a central opening (2.1.3). In the cavity (2.1.1), fluid is dispersed and pulverized repeatedly, significantly increasing the amount of bubbles formed.

The present invention deals with a mechanical device with wide application in the reduction or elimination of severe slug or plug flow instabilities in horizontal or inclined gas-liquid multiphase flow pipes, which lead to a reduced operating capacity, mechanical risks of rupture due to repetitive efforts, and operational non-viability.

A pressure relief valve that is spring-activated or utilizes a burst disk is described for preventing pipe bursts in a building plumbing system. A control valve system and method for preventing pipe bursts utilizing the pressure relief valve are also described. Also described are spring-activated control valve cartridges and control valve systems utilizing spring-activated control valve cartridges that prevent pipe bursts when installed building plumbing systems. Further described are methods for preventing pipe bursts in building plumbing systems comprising the step of disposing a relief valve or spring-activated cartridge according to the disclosure in a building plumbing system.

The invention discloses a monomer structure and a resistance reduction structure. The monomer structure comprises a monomer structure base body and a groove structure on the monomer structure base body. In the extending direction of the groove structure, the depth of the groove structure is gradually reduced from the center to the two sides, the flow speed of the center area is high, the deep groove can reduce the direct contact area of fluid and the surface of the base body, and friction resistance is reduced; the flow velocity on the two sides is low, the shallow grooves can avoid formation of retention eddy current, local energy loss is reduced, and resistance reduction uniformity in the flowing direction is achieved; the depth of the grooves is gradually reduced from the central groove to the grooves on the two sides in parallel to the extending direction of the groove structure, the central groove plays a main role in diversion, and the deep design can strengthen the'groove effect '; the grooves on the two sides assist in shunting, fluid channeling between the adjacent grooves can be avoided through the shallow design, and the overall flowing stability is improved. The trench structure is optionally a continuous structure or a discontinuous structure.

A laminar flow element including a single-piece layer of sheet stock having a first surface and a second surface opposite the first surface. The layer is an annular flat disk. The first surface includes at least one channel formed by etching. Sidewalls are formed by the at least one channel, the sidewalls having a height sufficient to create a transverse laminar flow.

The invention relates to an outlet elbow assembly (100) for discharging a multiphase flow medium, in particular consisting of water, solids and air, in which the outlet elbow assembly comprises a pipe (101) having a first horizontal pipe section (102) which, in a mounted position, extends along a first centerline (M102) running in a horizontal direction (H), and a second horizontal pipe section (102) which, in a mounted position, extends along a second centerline (M102) running in a horizontal direction (H); a downcomer section (103) adjoining the first horizontal section (102) and extending in the installed position along a downcomer line (F) running downward; and a second horizontal pipe section (104) adjoining the downcomer section (103) and extending in the installed position along a second centerline (M104) running in the horizontal direction (H). In the installed position, the second centerline (M104) lies below the first centerline (M102) and the flow medium is guided through the pipe (101) in the flow direction (A) in the direction of the first centerline (M102), the descending line (F) and the second centerline (M104). The downcomer section (103) and / or the second horizontal section (104) are / is equipped with at least one guide element (105, 307, 406) which is designed and arranged in such a way that the flow medium can be guided substantially in the flow direction (A) and a movement perpendicular to the flow direction (A) is partially suppressed.

The invention provides a wind wheel device for reducing wind load and wind-induced vibration of a photovoltaic module, and relates to the technical field of structural vibration control, the wind wheel device comprises wind wheel bases arranged on two sides of a photovoltaic panel, the left end and the right end of each wind wheel base are respectively provided with two circular hole grooves, and wind wheel bearings are arranged in the circular hole grooves; the two ends of a wind wheel rotating shaft penetrate through the wind wheel bearings on the two sides respectively, and a wind wheel is arranged on the wind wheel rotating shaft. According to the wind wheel device, flow field transformation caused by passive rotation of the light wind wheel along with wind acts on the surface of the photovoltaic panel, the pressure difference between the upper surface and the lower surface of the photovoltaic panel can be effectively improved, and the vibration phenomenon generated when the photovoltaic panel is subjected to wind loads is reduced; the wind wheel devices are installed on the front edge and the rear edge of the windward side of the photovoltaic panel and passively rotate along with wind through light wind wheels. Flow separation at the windward front edge can be effectively reduced by mounting the front edge, shedding of trailing edge trailing vortex can be effectively reduced by mounting the front edge on the trailing edge, and the influence of flow-induced vibration is further improved.

The utility model provides a reducing diversion type groove three-way connector which comprises a main pipe and an auxiliary pipe, grooves are formed in the main pipe and the auxiliary pipe, a mounting box is arranged at the connecting position of the main pipe and the auxiliary pipe, and a rotating shaft is rotationally connected in the mounting box. A flow guide body capable of preventing fluid from directly impacting the inner wall of the joint of the installation box and the main pipe is fixedly connected to the rotating shaft. The three-way connector has the advantages that the structures such as the mounting box, the rotating shaft and the flow guide body are arranged, after the three-way connector is connected with an external pipeline, fluid impacts on the flow guide body in the mounting box when flowing to an auxiliary pipe, the flow guide body rotates under the impact effect, the inner wall of the three-way connector is protected, the fluid is guided, and the service life of the three-way connector is prolonged. The fluid is caused to flow to the sub-pipe. Thus, the inner wall of the joint of the main pipe and the auxiliary pipe is protected by the flow guide body, and long-term use of the three-way connector is facilitated. The multiple reinforcing hoops are used for reinforcing different weak positions of the three-way connector, so that the overall strength of the three-way connector is higher.

The invention relates to the technical field of pipelines, discloses a turbulence inhibitor of airflow, preparation and application of the turbulence inhibitor and a gas conveying method, and aims to solve the problem of over-high energy consumption caused by pipeline friction resistance in pipeline transportation of gas. The turbulence inhibitor comprises microparticles, the length of the microparticles is larger than or equal to eta and smaller than or equal to Lx, and Lx is the turbulence integral scale; eta is the Kolmogorov scale, eta = (v3 / epsilon) 1 / 4, and v is the kinematic viscosity of the airflow; epsilon is the turbulent flow energy dissipation rate. The turbulence inhibitor has the advantages of being high in applicability, excellent in drag reduction effect, economical, capable of saving energy and the like.

A flow conditioning insert for insertion in a flow conduit transporting a flow stream is described. The flow conditioning insert includes an inlet side receiving the flow stream, an outlet side receiving the flow stream after the flow stream passes through the inlet side, and an internal structure positioned between the inlet side and the outlet side and positioning the flow conditioning device within the flow conduit. The internal structure includes a plurality of a flow conditioning apertures extending between the inlet side and the outlet side and a plurality of flow mixing diverters positioned within one or more flow conditioning apertures, each flow mixing diverter imparting a directional flow condition on fluid passing through a flow conditioning aperture that includes the flow mixing diverter.

The utility model discloses a hedging energy dissipation device based on a reverse Tesla valve, which comprises the reverse Tesla valve and a secondary buffer pool, a communicating pipe is communicated between the reverse Tesla valve and the secondary buffer pool, one end of the reverse Tesla valve far away from the secondary buffer pool is fixedly connected with a liquid inlet pipe, and the other end of the reverse Tesla valve far away from the secondary buffer pool is fixedly connected with a liquid outlet pipe. A buffering groove is formed in the top of the secondary buffering pool, a plurality of arc-shaped sliding grooves are formed in the buffering groove, arc-shaped baffles are arranged in the sliding grooves in a sliding mode, and one ends of the arc-shaped baffles extend into the buffering groove. According to the energy dissipation device, liquid is input into the reverse Tesla valve through the liquid inlet pipe, the purpose of primary hedging energy dissipation is achieved, then the liquid enters the buffering groove of the secondary buffering pool through the communicating pipe, the liquid makes contact with the arc-shaped baffles, and the purpose of secondary energy dissipation is achieved; the device can achieve the purpose of multi-stage energy dissipation and has the advantages of being simple in structure, high in energy dissipation efficiency, wide in application range and the like.

An apparatus for receiving a fluid stream therethrough comprises a body having an inlet end and an outlet end and defining a passage axially therethrough from the inlet end to the outlet end. The body comprises a first portion comprising first helical angle elements for inducing a first vortex flow component in the fluid stream, and a second portion comprising second helical angle elements for inducing a second vortex flow component in the fluid stream. The first helical angle elements have one of a left-handed or a right-handed orientation, and the second helical elements have the other of the left-handed or the right-handed orientation. The apparatus may be a tubing insert.

The invention belongs to the field of structural engineering and fluid mechanics, and particularly relates to a passive vortex vibration control device and method based on a collision type tuned mass damper and synthetic jet flow combination. The control device comprises a piston cylinder arranged in the bluff body structure, a piston capable of doing reciprocating motion is arranged in the piston cylinder, through holes are formed in the surfaces, located on the two sides of the piston cylinder, of the bluff body structure, and the two ends of the piston cylinder are communicated with the through holes through fluid pipelines. When vortex-induced vibration happens to the bluff body structure, the piston is driven by structural vibration to reciprocate in the piston cylinder, on one hand, the damping control effect of the tuned mass damper is generated, vibration energy is dissipated through gas compression and expansion, on the other hand, fluid is driven to flow in the fluid pipeline, periodic zero-mass synthetic jet is generated at the position of the through hole, and the zero-mass synthetic jet is generated. The interference vortex falls off, and the fluid load is reduced. According to the invention, through two cooperative physical mechanisms of damping control and flow control, the vortex vibration of the structure is jointly and efficiently inhibited from two aspects of energy dissipation and energy absorption.

This disclosure relates to a cooling arrangement (1) for cooling a transformer (10) in a transformer box (12), the cooling arrangement (1) comprising: a transformer box (12) at least partially filled with an electrically insulating fluid during use; a transformer (10) having windings (16); at least one heat exchanger (18); a fluid discharge device (20) arranged in the transformer box (12) and fluidly connected to the at least one heat exchanger (18); and a pump (22) in fluid communication with the at least one heat exchanger (18) and the fluid discharge device (20). The fluid discharge device (20) includes at least one Coanda effect fluid flow multiplier (21) configured to discharge cooled fluid along a discharge axis (c) toward one or more windings of the windings (16) of the at least one phase arm (14) of the transformer (10).

This application provides a transfer module and a fluid device. The transfer module includes a first connecting part, a second connecting part, and a mating connecting part. The first connecting part and the second connecting part are opposite to each other and spaced apart, forming a fluid cavity. The first connecting part has a first through hole communicating with the fluid cavity, and the second connecting part has multiple second through holes communicating with the fluid cavity. At least one partition is detachably provided in the fluid cavity to divide it into multiple chambers, which are spaced apart from the first connecting part to the second connecting part. The partition has multiple perforations communicating with the chambers on opposite sides of the partition. The number of perforations in each partition and the number of second through holes in the second connecting part increase progressively from the first connecting part to the second connecting part. This improves the control accuracy of fluid distribution by the transfer module. Furthermore, the transfer module is integrated and occupies less space.

This invention relates to the field of heat dissipation airflow mesh technology, and provides an airflow mesh for passive airflow cooling, including a pipe assembly, a clamping assembly, and an adjusting assembly. The pipe assembly includes a main pipe, a secondary pipe, an adjusting pipe, a vertical plate, and a horizontal plate. The clamping assembly, sleeved on the outer wall of the adjusting pipe, includes a fixed plate, a movable part, a rotating plate, and a support block. The adjusting assembly is located at one end of the main pipe and inside the main and secondary pipes, and includes a motor, a rotating shaft located at the output end of the motor, a drive bevel gear sleeved on the end of the rotating shaft away from the motor, a rotating part located on the end of the drive bevel gear away from the rotating shaft, and a spiral part sleeved on the rotating part. The function of the pipe assembly is to connect traditional heat dissipation pipes in sections, and through the combined effect of the septum effect and Bernoulli's principle, to compress the gaseous working fluid and release heat, which is conducted away through the metal thermally conductive material, thereby reducing the temperature of the airflow after it passes through by approximately 50 watts / m² / m / s.

A technique for reducing erosion on the interior of a production component of a well system involves coating the interior of the production component with a series of ribs and grooves. The coating can be a non-metallic material in which the ribs and grooves are formed. The coating can also be applied as a series of ribs that are attached to the interior surface of the production component. The series of ribs can be made of alternating materials that have a different hardness causing the ribs to wear at different rates.

The application discloses a flow field uniform distribution device suitable for adjustable and retractable holes of a pulverized coal pipeline, which comprises a shell, a central blunt body arranged at the center of the shell, a first flow guide ring, a second flow guide ring and a third flow guide ring arranged between the shell and the central blunt body from outside to inside, and the first flow guide ring, the second flow guide ring and the third flow guide ring are connected together through support ribs and the shell; the central blunt body comprises a lip-shaped blunt body and annular blades arranged on the circumference of the lip-shaped blunt body, and the shell is provided with an air inlet and an air outlet along the axial direction. A plurality of annular airflow channels are formed between the first flow guide ring, the second flow guide ring, the third flow guide ring, the central blunt body and the shell. The application can improve the distribution characteristics of airflow after the adjustable and retractable holes of the primary air pipeline, improve the airflow distribution uniformity, meet the test requirements under the existing actual conditions, and thus improve the test precision and work efficiency.

A flow conditioner includes a group of flow conditioning units including a first flow conditioning unit and a second flow conditioning unit. The flow conditioner also includes a mixing space for developing a flow. The mixing space is located between the first and second flow conditioning units. One of the first or second flow conditioning units can include one or more of a shaper or a reducer, and the other of the first or second flow conditioning units can include one or more shapers.

The utility model provides a compressed air buffer tank. The compressed air buffer tank comprises a tank body, a buffer device and an impurity removal and dehumidification device, the tank body is of a horizontal structure and comprises a left kettle cover provided with an air inlet and a safety opening, a middle kettle body and a right kettle cover provided with an air outlet which are detachably connected; the buffer device is detachably mounted in the middle kettle body; the buffer device comprises a buffer disc which is vertically arranged and is spaced from the inner wall of the middle kettle body, a buffer seat I which is mounted on the inner wall of the middle kettle body and is elastically connected with the buffer disc in the transverse direction, a buffer plate which is vertically arranged and is positioned on the right side of the buffer disc, and a buffer seat II which is mounted on the inner wall of the middle kettle body and is elastically connected with the buffer plate in the transverse direction; the buffer plate is of an annular structure, and the annular plate directly faces the interval position between the buffer disc and the middle kettle body; the impurity removal and dehumidification device is detachably mounted in the right kettle cover and is positioned on the left side of the air outlet. The compressed air buffer tank is detachable, easy to maintain, good in buffer effect and high in stability, and has impurity removal and dehumidification functions.

The present invention further suppresses variation in flow distribution using a simple configuration. A fluid distributor 20 comprises a cylindrical section 23, an inflow pipe 22 that allows the inflow of a fluid through the inflow end of the cylindrical section 23, and at least one branch pipe 26 that radially extends from the cylindrical section, wherein the cylindrical section 23 and the inflow pipe 22 are connected together so as to have a common central axis C, the central axis of the branch pipe 26 is orthogonal to the central axis C of the cylindrical section 23, and the downstream end side of the cylindrical section 23 in a flow direction functions as a buffer section 25 that blocks the downstream direction in the flow direction. The ratio of a cylindrical section length d2 to a cylindrical section outer diameter d1 is 3.4-4.1, the ratio of a header section length d3, which is the length from the inflow end of the cylindrical section 23 to the connection center position of the branch pipe 26, to 1 / 2 of the cylindrical section length d2 is 0.9-1.3, the ratio of the cross-sectional area S1 of the cylindrical section 23 to the cross-sectional area S4 of the inflow pipe 22 is not less than 2.5, and the ratio of an inflow pipe length d5 to an inflow pipe outer diameter d4 is 2.2-4.8.

A device to reduce turbulent flow skin friction uses carbon dioxide, riblets, and suction holes to reduce the overall drag of a body moving in a fluid. A deflector (2) pushes up the boundary layer of the incoming flow on a surface (1). Carbon dioxide is injected into a plenum (3) and ejected through an exhaust slot (4). Riblets of specific dimensions (5) are placed to interact with the carbon dioxide flow that is now the sublayer viscous flow. After passing the riblets, the flow is sucked partly through suction holes (6), preventing flow separation that could increase the form and wave drag.

A drainage pipe system generates suction pressure from a moving fluid. The drainage pipe system has a main drainage pipe; and an outlet section comprising an extension pipe that transitions into an open-sided outlet channel. The extension pipe is sized to fit either internally or externally with respect to the main drainage pipe, thereby enabling the outlet section to extend and retract along the main drainage pipe's surface. The open-sided outlet channel is configured to be positioned with its open side facing an external mating surface, thereby generating suction pressure at the outlet of the main drainage pipe as the moving fluid is directed through the outlet channel.

Embodiments of this application disclose an antenna apparatus, to reduce windload. The antenna apparatus in embodiments of this application includes a radome. An interference structure is disposed on a surface of the radome, and the interference structure is configured to change flowing of an airflow at a surface boundary layer when the airflow passes through the surface of the radome. The interference structure is disposed on the antenna apparatus to change the flowing of the airflow at the surface boundary layer. This reduces windload on the antenna apparatus.