1056results about "Fluid dynamics" patented technology

A flow control device having: a composition gradient defining a first coefficient of thermal expansion and a second coefficient of thermal expansion that differs from the first coefficient of thermal expansion; and a thermoelectric junction operationally coupled to the composition gradient, wherein the composition gradient is formed of either of a plurality of dissimilar metals or of plastic with fillings or fibers.

The present invention comprises an aerodynamic profile body with an outer flow surface for flow by a fluid, wherein the aerodynamic profile body comprises: - an upper cover layer and a lower cover layer, which form at least part of the outer flow surface and are designed to be flexurally elastic in an end section of the aerodynamic profile body, and - an actuator device with at least one actuator provided in an interior of the aerodynamic profile body, which actuator interacts with at least one of the cover layers in the flexurally elastic end section in such a way that the cross section of the aerodynamic profile body in the flexurally elastic end section can be changed by the at least one actuator, characterized in that - the at least one actuator is fastened with a first actuator end to a first fastening point in the interior and with at least a second actuator end to a second fastening point in the interior, - wherein the second attachment point is arranged transversely to the span of the aerodynamic profile body at a distance from the first attachment point and on an inner side of one of the cover layers in the flexurally elastic end section, and - the at least one actuator is designed such that the linear distance between the first attachment point and the second attachment point can be changed in order to change the cross-section of the aerodynamic profile body.

The present application provides a method for generating a micro-scale columnar high-speed acoustic beam in a liquid environment, comprising: a liquid environment; a high-frequency resonator, which generates 0.5-30 GHz ultrasonic waves to act on the liquid environment during operation, generating a directional fluid motion along the direction of propagation of the sound wave in the liquid at the solid-liquid interface, i.e., a columnar focused acoustic beam; the high-frequency resonator is driven to operate in at least one driving cycle with a first power, each driving cycle including a first stage and a second stage, the first stage driving the high-frequency resonator to operate, and the second stage stopping the driving; the magnitude of the first power causes the high-frequency resonator to generate an acoustic beam in the first stage; and the duration of the first stage at the first power is less than the second threshold or the duty cycle of the first stage in one driving cycle is less than the first threshold. Corresponding applications are also provided, such as a method for directional transport of liquids or particles in liquids, and a method for processing target objects.

The utility model provides a vehicle-mounted liquid hydrogen storage tank and a vehicle, and relates to the field of vehicle engineering technology. The vehicle-mounted liquid hydrogen storage tank comprises: a tank body and a spiral rib installed inside the tank body, and the outer ring of the spiral rib is welded to the tank body. Compared with welding multiple baffles separately, the processing efficiency is higher, which is conducive to reducing the production cost of the liquid hydrogen storage tank. The spiral rib can separate the impact of liquid hydrogen, and can also separate the thermal stratification caused by heat leakage, shaking and flashing. The temperature difference of each divided part is small, and then the overall temperature difference is also small, which reduces the degree of thermal stratification to a certain extent, thereby achieving the technical effects of preventing liquid hydrogen from shaking and reducing the degree of thermal stratification.

The utility model belongs to the technical field of ball valves, and particularly relates to a ball body of a ball valve, which comprises a ball body, a flow channel hole for fluid to pass through is arranged in the center of the ball body, one end of the flow channel hole is an inlet end, the other end of the flow channel hole is an outlet end, and a plurality of spiral rifling grooves are arranged on the inner wall of the flow channel hole in an annular array mode. A plurality of groups of defoaming channels are formed in the spiral rifling groove, one end, close to the direction of the inlet end, of each defoaming channel is an inlet, the other end of each defoaming channel is an outlet, the hole diameter of each outlet is smaller than that of each inlet, and the hole diameters of the inlets and the outlets in the groups of defoaming channels from the inlet end to the outlet end tend to be gradually reduced. The shape and the layout of the spiral rifling groove can improve the flowing stability of the fluid, and the defoaming channel shrinks and crushes large bubbles in the fluid step by step to enable the large bubbles to be dissolved in the liquid, so that the detection precision of the metering equipment on the fluid flow is improved, and the quality of subsequent chemical preparations or liquid blending is guaranteed.

A valve system includes at least one spin chamber having an outlet drain configured to allow flow out of the spin chamber. A main spin surface of the at least one spin chamber is defined around the outlet drain. A directional jet system is in fluid communication with the at least one spin chamber. The directional jet system includes a plurality of members each is configured to move between a first position for directing a tangential flow around the drain of the at least one spin chamber and a second position for directing a radial flow toward the drain of the at least one spin chamber.

The utility model provides a movable pressure container. The movable pressure container comprises a cylinder body and a wave-proof assembly. Wherein the cylinder body is provided with a stainless steel coating layer and a carbon steel base layer, and the base layer wraps the outer side of the coating layer. The anti-wave assembly comprises a base plate and an anti-wave plate, one side of the base plate is attached to the inner wall of the base layer, and an avoiding hole for avoiding the base plate is formed in the covering layer, so that the base plate can be connected to the base layer and extends towards the interior of the barrel body. A plug welding through hole is formed in the base plate, and when the base plate is welded to the base layer, welding spots are filled in the plug welding through hole, so that the connection strength between the base plate and the base layer is improved. The wave-proof plate is connected to the base plate and located in the cylinder, so that the wave-proof assembly can be connected to the base layer, and the connection strength between the wave-proof assembly and the cylinder is improved.

The invention discloses a transcritical flow self-adaptive multi-stage nested structure drag reduction channel, and relates to the technical field of heat conduction and heat management. In order to overcome the technical defects that in the prior art, in an existing drag reduction and heat exchange strengthening technology, drastic changes of fluid physical properties caused by transcritical phase change in an LNG gasifier are difficult to deal with, and the efficient drag reduction effect is difficult to maintain, the technical scheme is that the drag reduction and heat exchange strengthening device comprises a flowing channel, a multi-stage nested groove structure is arranged on the inner wall of the flowing channel, the groove structure comprises a plurality of gradually-changed grooves formed in the flowing direction, and the width and the depth of the grooves are gradually changed in the flowing direction; the first-stage groove is a macroscopic groove which is processed along the inner wall of the flowing channel; the second-stage groove is formed in the first-stage groove and is a micro-scale groove; and the third-level micro-nano rough structure is arranged on the inner surface of the second-level groove and comprises micro-nano-level bulges and pits. The device is suitable for the work of drag reduction and heat exchange enhancement.

By manipulating the fluid flow in the proximity of an object such as a fuselage, a wing, or the hull of ship, the wave drag associated with this object can be substantially reduced. This can be accomplished by locally changing both the fluid flow velocity and the pressure of the fluid flow.

A fluid composition which is able to exhibit elastic turbulence while pumped through a flow path which compels changes of direction of flow streamlines and comprise a solution of two or more flexible linear polymers in two categories. The first category has an average molecular weight of at least 10 MegaDaltons and the second category has an average molecular weight in a range from 0.25 to 5 MegaDaltons. The concentration of the first polymer is sufficient to enable elastic turbulence with or without the second category. The concentration of the second category is greater than that of the first. When flowing under low shear towards or away from a chamber where the flow path will induce elastic turbulence, the second category polymer reduces elastic instabilities and consequent pressure drop, thereby reducing pumping energy requirement.

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 invention provides a flow dividing column and a gas flow control device, the flow dividing column comprises a flow dividing column main body, the flow dividing column main body comprises a plurality of flow dividing sheets stacked along the normal direction, each flow dividing sheet is provided with a plurality of vent grooves arranged side by side, and the vent grooves penetrate through the flow dividing sheets; an accommodating cavity for accommodating the shunting column main body is formed in the frame body; wherein the length of the shunting column is smaller than the distance between a first thin tube through hole and a second thin tube through hole in the base, and the first thin tube through hole and the second thin tube through hole are used for being connected with a capillary tube of a thermal sensor, so that the thermal sensor detects the flow. Due to the short flow dividing column, extra disturbance possibly generated when the airflow enters and leaves the flow dividing column is reduced, and the stability of the airflow and the accuracy of measurement are further improved. In addition, due to the small size, the flow dividing column is easier to disassemble and replace, the maintenance process is simplified, and the maintenance cost is reduced.

The invention provides a solution for inadequate boundary layer testing methods. The invention includes a uniquely configured multi-module concentric loop cycling water past a testing module to obtain real-time values and variables to use in CFD calculations. The invention is comprised of various sections, specifically designed to support the entire system. The system includes: one or more water reservoirs / degassing tanks, high- capacity water pumps, water stream straightener(s), stable flow section, air induction ports, viewing ports, test modules containing test surfaces designed to measure friction and pressure of a passing water or air / water stream. The present invention includes one or more sensors on the test surface(s) that convey conditions to one or more computers that may receive, store, process and send interpretations to one or more visual monitors on or near the invention in real time.

In one example, a fluid flow restrictor has a housing outlet offset from a housing inlet along a fluid flow direction so as to define a channel therebetween. A rotatable body that is disposed in the channel defines a bore that extends entirely therethrough such that the bore defines a bore inlet and a bore outlet. The flow restrictor has an interior surface disposed in the bore that defines an orifice having a cross-sectional dimension that is less than a cross-sectional dimension of the channel such that the orifice can restrict a flow of fluid as the fluid flows between the housing inlet and outlet. The rotatable body is rotatable between 1) a first orientation, where the bore outlet is offset from the bore inlet along the fluid flow direction, and 2) a second orientation, where the bore inlet is offset from the bore outlet along the fluid flow direction.

The invention relates to the technical field of pipeline noise elimination, in particular to a pipeline elbow noise reduction device which comprises a connecting elbow, an inner silencer is embedded in a bend of an inner cavity of the connecting elbow, a cavity exists between the inner silencer and the inner wall of the connecting elbow, and a neck bush is arranged between the inner silencer and the inner cavity of the connecting elbow. The inner silencer comprises an inflow part, an inward shrinkage part, a flow guide part and a discharge part which are integrally formed through flexible rubber, the inner diameters of the inflow part, the inward shrinkage part, the flow guide part and the discharge part are smoothly and gradually changed in the flow direction, and the outer wall of the inner silencer and the inner wall of the neck bush are seamlessly attached together. The silencer has the beneficial effects that the gradual change section design of the inner silencer maintains a laminar flow boundary layer through continuous curvature change, and flow separation is effectively reduced; the spiral flow guide fins are used for disassembling macroscopic vortex into micro-scale turbulent flow, so that energy dissipation is accelerated, and medium-high frequency noise is improved in a targeted manner; the sound absorption part is filled with an efficient sound absorption material, and a complementary silencing mechanism is formed with flow field optimization.

An assembly for connecting a tube having a tube connector and a flow restricting orifice. The flow restricting orifice includes a tubular nozzle having an insert portion for insertion into a mouth of the tube connector and a visible marking having a marking element which extends radially outwardly from the tubular nozzle and which includes a frangible connection which is connected to the tubular nozzle and which has at least one predetermined breaking point. The frangible connection is configured to release the marking element when the frangible connection is broken before the tube is completely pushed onto the tube connector. The marking element is configured to be retained on the tube connector or on a tube connected to the tube connector to remain, wherein the flow restricting orifice is fitted in a mouth of the tube connector.

The utility model provides a vortex ring generation device, which comprises a top wall, a vortex ring, a vortex ring, a vortex ring and a vortex ring, the side wall is arranged around one side of the top wall so as to form a gas cavity together with the top wall; a first air inlet is formed in the side wall, and the first air inlet is communicated with the first through hole through the air cavity; the siphon baffle is contained in the gas cavity, the siphon baffle is arranged around the first through hole to form an acceleration cavity, and the hole diameter of the acceleration cavity is increased along with the distance from the first through hole. The vortex ring generating device provided by the embodiment of the utility model is simple in structure and beneficial to reducing the pressure of an air source. The utility model further provides a liquid container comprising the vortex ring generating device.

A Venturi device with a primary flow path and a secondary flow path introduced into the primary flow path, wherein a flow of one or more flowable mediums in the primary flow path and the secondary flow path creates a vortex generating a suction at an inlet of the Venturi device. A particulate burner system can be used to combust fuel emission byproducts by injecting fuel and air into a housing having a bottom plate with a round bottom opening for burners to inject fuel into a combustion chamber and a top plate with a round top opening for exhausting fuel emissions. A thruster system can be used to propel munition for deep earth penetration by using a thruster system having a transfer cone connected to a munition body.

Systems for processing articles are essential for semiconductor fabrication. These systems employ a variety of apparatuses for controlling flow. In one implementation, an apparatus for controlling flow may utilize a body having a flow path extending from an inlet to an outlet. A valve, a flow restrictor, and a pressure sensor are operably coupled to the flow path. The valve incorporates first and second actuators which enable control of mass flow rates of fluid flowing through the flow path.

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.

A wing designed to pass through a fluid medium is provided, the wing having a plurality of alternating protrusions and valleys along a trailing edge thereof. The described wing uses the plurality of protrusions and valleys to counteract noise that is a function of wind speed and chord length. In an alternative variant, instead of or in addition to cancelling noise, the plurality of protrusions and valleys are adapted to generate or correct noise such that the noise is generated in a desired frequency band. In this variation, the plurality of protrusions and valleys are configured such that the generated noise is in the desired frequency band based at least on a frequency band that repels various types of animals given a specified local wind speed. In another variation, the plurality of protrusions and valleys are adapted to improve the aerodynamic performance of the wings, whether in the context of separate use or with multiple wings working together within the system.

The invention discloses a remote continuous adjustable low-wind-resistance air distribution tee joint suitable for a complex ventilation system, and belongs to the technical field of pipeline valves, the remote continuous adjustable low-wind-resistance air distribution tee joint comprises a tee joint body, a branch pipe air adjusting device, an angle control device and a flow guide device, the tee joint body comprises two branch pipe air inlet connecting sections, a tee joint air outlet section and a tee joint base, the top end of the branch pipe air inlet connecting section is connected with an air inlet pipe through a flange, the top end of the three-way air outlet section is connected with the three-way base through a flange, and the bottom end of the three-way air outlet section is connected with an air outlet pipe through a flange. Therefore, by the adoption of the remote continuous adjustable low-wind-resistance air volume distribution tee joint suitable for the complex ventilation system, stepless variable air volume adjustment of all branch pipes of the complex ventilation system is achieved, local resistance of the tee joint is reduced, and the remote continuous adjustable low-wind-resistance air volume distribution tee joint has the advantages of being capable of achieving stepless air volume adjustment, convenient to adjust, stable in working state and the like.

The invention relates to the technical field of stable anti-shake, and discloses a stable anti-shake device for photogrammetry and remote sensing, which comprises an external shell and is characterized in that an anti-shake mechanism is arranged in the external shell and is used for weakening disturbance of the outside to measuring equipment, and a power generation mechanism for supplementing power to the whole device is arranged in the anti-shake mechanism and is used for generating power to the measuring equipment. An anchoring mechanism for stabilizing the whole device is arranged at the bottom of the external shell, and a driving mechanism is fixedly connected to the bottom of the external shell and used for moving the whole device. Under the action of the anti-shake mechanism and under the guidance of the air guide assembly, air spirally accelerates along with the air guide groove to downwards impact the external shell and exerts downward pressure on the external shell when facing external wind power interference, so that the whole device is more stable, meanwhile, the air is guided into the suspension assembly, the holder for supporting the measurement equipment is suspended, and the measurement precision is improved. And the situation that the measurement equipment is influenced by influencing the anti-shake equipment by the outside world is weakened.

A flow restrictor includes a first flowbody defining a first end portion, a second end portion opposite the first end portion and an orifice between the first end portion and the second end portion. The first end portion defines a plurality of first slots, and the second end portion defines a counterbore having a first diameter. The flow restrictor includes a second flowbody defining a plurality of second slots and having a second diameter proximate the plurality of second slots that is greater than the first diameter of the first flowbody. The second flowbody is configured to be received within the counterbore of the first flowbody.

The utility model discloses an incoming flow gas temperature and pressure regulating system which comprises a vortex tube, a heat exchanger and a gas mixing mechanism. The incoming flow gas pipeline is communicated with a gas inlet of the vortex tube, a cold end outlet of the vortex tube is used for being communicated with an inlet of a heat exchanger, and a hot end outlet of the vortex tube is used for being communicated with a first flow inlet of a gas mixing mechanism; an outlet of the heat exchanger communicates with a second flow inlet of the gas mixing mechanism, after high-temperature and high-pressure incoming flow gas is separated through the vortex tube, low-temperature gas is obtained at a cold end outlet of the vortex tube, and the low-temperature gas enters the gas mixing mechanism after being heated through the heat exchanger; high-temperature gas is obtained at a hot end outlet of the vortex tube and enters the gas mixing mechanism, and low-pressure medium-temperature gas is obtained at an exhaust port of the gas mixing mechanism. High-pressure gas directly drives the vortex tube, cold end outlet low-pressure low-temperature gas and the inlet and outlet pressure ratio of the vortex tube are larger, and therefore the temperature of the cold end outlet of the vortex tube is lower, and the larger the temperature difference between the cold side and the hot side in the heat exchanger is, the higher the heat exchange efficiency of the heat exchanger is.

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.

The invention discloses a thermostatic water mixing valve based on thermal sterilization, and relates to the technical field of water mixing valves, the water mixing valve comprises an anti-convection mechanism, an anti-layering mechanism, a filtering mechanism, a valve body mechanism and a detection mechanism, the anti-convection mechanism is fixedly connected with the valve body mechanism, the anti-layering mechanism is fixedly connected with a valve body, the filtering mechanism is communicated with the valve body mechanism, and the detection mechanism is fixedly connected with the valve body mechanism. The detection mechanism is fixedly connected with the valve body mechanism, the anti-convection mechanism is fixedly connected with the valve body mechanism, cold and hot water convection interference is restrained through a mechanical structure, and it is ensured that the water temperature levels are balanced. The anti-layering mechanism is fixedly connected with the valve body and is structurally provided with a layer uniformizing component used for weakening the density difference of cold water and hot water to cause layering, the uniformity of the outlet water temperature is further guaranteed, the filtering mechanism is used for effectively removing impurity particles in water and preventing blockage and pollution, and the detection mechanism is used for collecting system operation state data. The problems of confused convection, large temperature difference, impurity accumulation, thermal sterilization temperature and the like are effectively solved.