103results about How to "Reduce turbulence intensity" patented technology

The invention discloses a cavitation and erosion experiment platform based on a water circulation system. The cavitation and erosion experiment platform based on the water circulation system comprises a pump station, a water tank and a test section which are connected with one another through water pipes, flanges and the like, wherein the water tank is internally provided with a baffle plate; the test section is a fluid channel which consists of an upper plate, a base plate, a rear plate and a front plate and has a square cross section, and is provided with three observation windows including a front observation window, a rear observation window and an upper observation window, and the base plate is provided with a turbulent flow object. The cavitation and erosion experiment platform provided by the invention has the advantages of simple structure, stable running, continuous adjustable cavitation intensity, adjustable shape of the turbulent flow object, adjustable distance between the turbulent flow object and a test element, simple experiment operation, favorable performance effect of induction and cavitation by the turbulent flow object, easiness in observation on generation areas and dynamic characteristics of a cavitation bubble group close to the turbulent flow object.

The invention relates to a laser cutting device and a laser head thereof. The laser head comprises an air inlet ring, a first rectifier tube, a second rectifier tube and an air nozzle. An annular groove is formed in the inner side of the air inlet ring, and air inlet holes communicated to the groove are formed in the outer side of the air inlet ring; ventilation holes are formed in the side wall of the first rectifier tube, the first rectifier tube is sleeved with the air inlet ring, and the ventilation holes are communicated with the groove; an air flow passage is formed inside the second rectifier tube, and the second rectifier tube comprises a first end and a second end which are opposite; the second rectifier tube is sleeved with the first rectifier tube, and a rectifying passage is formed between the first rectifier tube and the second rectifier tube; and an air outlet gap is formed between the first rectifier tube and the first end, and the air flow passage and the rectifying passage are communicated through the air outlet gap. Due to two times of rectifying, the airflow distribution evenness of cutting air can be improved, and the intensity of turbulence can be reduced, so that the influence of the pneumatic optical effect on a laser path is reduced, the stability of the quality of laser beams is guaranteed, the roughness of the machined surface is reduced, and the perpendicularity of cut lines is improved.

The invention claims a composite gas drag reducer and a preparation method thereof. The method comprises the following step of: reacting organic dibasic acid or organic binary acid anhydride, organic amine and monocarboxylic acid with a long carbon chain, thereby obtaining the composite gas drag reducer, wherein the specific steps the reaction are as follows: (1) reacting the organic dibasic acid or organic binary acid anhydride and the organic amine in an inert atmosphere, (2) adding the monocarboxylic acid with the long carbon chain to the reaction system of the finished reaction in the step (1), thereby obtaining the composite gas drag reducer via reaction. The composite gas drag reducer is obvious in drag reduction of the pipeline gas and energy conservation, and has the advantages of cheap and easily available raw material, simplicity in operation, mild reaction conditions, simple processes, low equipment requirements and easiness for industrial production.

An apparatus and process for treating a heavy hydrocarbon feedstock having a specific gravity differential between components of the feedstock is disclosed. The apparatus includes a treatment vessel having an inlet for receiving the feedstock. The apparatus also includes a primary separation container located in the treatment vessel, the primary separation container being operable to accumulate feedstock to cause a low specific gravity portion of the feedstock to separate and rise to an upper surface of the accumulated feedstock. The apparatus also includes a first weir for collecting the low specific gravity portion from the surface of the accumulated feedstock in the primary separation container. The apparatus further includes a first outlet in the primary separation container, the first outlet being operably configured to receive settling solids in the accumulated feedstock and to produce a first discharge stream at the first outlet. The apparatus also includes a secondary separation container located in the treatment vessel to receive the collected low specific gravity portion, the secondary separation container being operable to accumulate the collected low specific gravity portion to cause hydrocarbon products to separate and rise to an upper surface of the accumulated low specific gravity portion of the feedstock. The apparatus further includes a product outlet for collecting the hydrocarbon products from the upper surface of the accumulated low specific gravity portion to produce a hydrocarbon product stream at the product outlet.

Disclosed is a novel configuration scheme for electric field of a lens style high voltage electrostatic dust collector, which is composed of a negative corona electrode, a positive corona electrode, a lens and a bipolar or an unipolar high voltage power supply for the dust collector; the invention is a novel dust collecting principle derived from the electrostatic dust collecting principle; the electric focusing function of the electric field makes most electric wind to traverse the lens port, limiting the second flow within the dust collecting chamber; thus the turbulence intensity in the fume passage is reduced, and the inevitability of the dust collecting process is improved; the smaller the dust size in the electric field is, the stronger the electric focusing function is received; so electric field has the unique collecting function for the dust; meanwhile, the electric field has a good hydromechanics shielding effect for the dust collected in the dust collecting chamber, and can effectively reduce the reentrainment loss; comparing with the conventional electric field, the dust collecting electric field with this configuration is high in dust collecting efficiency, low in fugitive dust loss, wide in application range, light in structural weight, and has high performance cost ratio and wide application prospect.

The invention discloses an axial flow fan ternary impeller with a vein-shaped structure and a nonuniform empennage. The axial flow fan ternary impeller comprises a hub, and a connecting piece for a shaft sleeve fixed on the hub. The axial flow fan ternary impeller further comprises twisted blades and splitter blades fixedly connected to the hub; the twisted blades include suction surfaces and pressure surfaces; wing-shaped grooves are formed in the tops of the twisted blades; vein-shaped grooves are formed in the upper half parts of the pressure surfaces of the twisted blades; the wing-shaped grooves are communicated with the vein-shaped grooves through exhaust ports; winglet projections and dense winglets are arranged at the tail parts of the suction furnaces of the twisted blades; the dense winglets are arranged on two sides of the winglet projections; parabola small holes are formed in the twisted blades; the splitter blades are arranged between two adjacent twisted blades; and the heights of the splitter blades are smaller than the heights of the twisted blades by one half.

The invention provides a hydrodynamic cavitation generating device. The hydrodynamic cavitation generating device comprises a buffering body, a rectifying pore plate, a rectifying body, a rectifying grid plate and a testing body which are connected by flanges in sequence, wherein the testing body is a fluid channel which is composed of a shell and a ladder-shaped bottom plate and has a square cross section; three observation windows which are as wide as the fluid channel are opened on front, back and upper sides of the testing body; a bottom plate is split and is provided with a turbulent flow platform. A coming liquid sequentially passes through the buffering body, the rectifying pore plate, the rectifying body and the rectifying grid plate, the turbulence intensity can be reduced and the stability of water flow is enhanced effectively, so that the coming liquid can stably enter the testing body. The hydrodynamic cavitation generating device is simple in structure, convenient to detach, high in structural strength and good in impermeability; a test piece and the turbulent flow platform are convenient to replace; the distance between the test piece and the turbulent flow platform is convenient to adjust; the turbulence intensity is small and the cavitation strength can be adjusted continuously; the cavitation property can be observed directly and easily.

A vertical dynamic cyclone separator for removing sand from thick oil and separating the oil-displacing polymer from the recovered liquid by gravitation and centrifugal is composed of a frequency-variable motor, a vertical cyclone separator with a rotary drum driven by said motor, and a settling tank for collecting the separated heavy phase.

A system, method, and apparatus for solving flow-induced track misregistration (TMR) problems in hard disk drives (HDD) are directed to breaking up large-scale eddies, and straightening air flows with honeycomb structures, woven wire screens, and guide vanes or holes. In addition, boundary layer manipulation techniques are applied to the airflow in the HDD, such as boundary layer suction with slots or holes, and wall damping techniques, such as an open honeycomb seal and Helmholtz resonators. These flow-conditioning solutions reduce the turbulence intensity throughout the HDD to reduce TMR. These solutions achieve these goals while minimizing increases in the running torque needed to overcome their inherent rotational drag.

A side channel compressor for compressing a gas comprises a housing (3), a side channel (30), located in the housing (3) and having a cross-sectional area (A), for compressing a gas, a gas inlet opening (31) formed in the housing (3), the gas inlet opening (31) being in flow connection with the side channel (30) for introducing a gas, a gas outlet opening (32) formed in the housing (3) for discharging the gas to be compressed from the side channel (30), wherein the gas outlet opening (32) is in flow connection with the gas inlet opening (31) via the side channel (30), and an impeller (2) which is mounted for rotation in the housing (3) and comprises impeller blades (1) disposed in the side channel (30), wherein the cross-sectional area (A) of the side channel (30) decreases non-monotonically from the gas inlet opening (31) towards the gas outlet opening (32).

The invention discloses an axial flow fan three-dimensional impeller with leaf vein structures and seagull-shaped splitter blades. The axial flow fan three-dimensional impeller comprises a hub and further comprises curved-twisted blades and splitter blades, wherein a shaft sleeve is fixed on the hub by a connecting piece; the curved-twisted blades and splitter blades are fixedly connected onto the hub; the curved-twisted blades comprise suction surfaces and pressure surfaces; wing grooves are formed in the tops of the curved-twisted blades; leaf vein shaped grooves are formed in upper half parts of the pressure surfaces of the curved-twisted blades; the wing grooves are communicated with the leaf vein shaped grooves through air outlets; small wing protrusions are arranged at the tails of the suction surfaces of the curved-twisted blades; parabolic pinholes are formed in the curved-twisted blades; a splitter blade is arranged between every two adjacent curved-twisted blades; and the height of each splitter blade is smaller than one half of that of the curved-twisted blade. According to the axial flow fan three-dimensional impeller disclosed by the invention, the secondary flow phenomenon can be reduced, boundary layer separation is avoided, wake vortex of the blades is suppressed, turbulent dissipation and flow losses are reduced, and the axial flow fan three-dimensional impeller has the characteristics of high efficiency, excellent performance, low noise and energy conservation.

The invention provides a blade. The blade comprises a leading edge allowing a liquid to flow in, a tailing edge allowing the liquid to flow out, a suction surface and a pressure surface, wherein one end of the edge of the suction surface is connected with one end of the edge of the pressure surface at the leading edge, the other end of the edge of the suction surface is connected with the other end of the edge of the pressure surface at the tailing edge, shapes of aerofoil sections of the blade in the extending direction keep unchanged, and positions of leading and tailing edges of center lines of the aerofoil sections of the blade are periodically distributed in the extending direction. The positions of the leading and tailing edges of the center lines of the aerofoil sections of the blade are periodically distributed in the extending direction, so that flow separation on the blade surface can be effectively inhibited, turbulence intensity of the tailing edge is reduced, efficiency of the blade is improved, and falling-off noise of tailing edge vortex is reduced.

The invention discloses a law enforcement water cannon for a ship. A steering device is arranged between a base and a cannon body, the steering device can control the law enforcement water cannon to rotate horizontally; the cannon body is arranged in a roundabout shape, and a tilting device for controlling the angle of a cannon head is arranged between the cannon body and the cannon head; the canon head comprises an elbow pipe, the tilting device is connected to one end of the elbow pipe, and a rectifying section is connected to the other end of the elbow pipe; a steady flow speed increasing section and a steady flow jetting section are arranged at the right end of the rectifying section in sequence; an arc-shaped guide pipe is arranged in the elbow pipe; a rectifying plate is arranged atthe left end of the rectifying section, and a flow straightener is arranged at the right end of the rectifying section; and the steady flow speed increasing section is arranged in a taper shape to increase flow rate of the water cannon, and the steady flow jetting section is arranged in a taper shape, and the taper of the steady flow jetting section is smaller than the taper of the steady flow speed increasing section. The law enforcement water cannon has a simple structure, the design is ingenious, a large amount of turbulence flow generated by passing through corners of the cannon body is effectively eliminated to enable the turbulence intensity of water columns jetted by the water cannon to be the lowest, the range of the water cannon is increased, the range of impacting is expanded, the water column forming effect is optimized, the strength of beating is strengthened, and promotion of application value is great.

The invention relates to an air inlet device and a passenger car provided with the same, and belongs to the field of vehicles. The air inlet device comprises a water retaining structure which is a louver-type structure composed of a plurality of blades. The air inlet device is arranged in the front-back direction consistent with the advancing direction of the passenger car. The blades are distributed at intervals in the front-back direction. The rear part of each blade inclines towards the outer side of an air inlet of the air inlet device. In the left-right direction perpendicular to the front-back direction, the adjacent blades overlap to form overlapping sections, and air flows into the passenger car through airflow channels which are formed between the adjacent blades and are oblique with reference to the airflow directions. Compared with a structure that air flows into a car along an airflow channel which is formed between two water baffles and perpendicular to the airflow direction in the prior art, the air inlet device and the passenger car provided with the same can obviously reduce the air flowing resistance.

The invention provides a nozzle with the adjustable swirling number and the turbulence level, a nozzle array and a combustor. The relative position between an inner-circle blade and an outer-circle blade of a cyclone is adjusted by rotating a middle cylinder or an outer-layer cylinder, and the purpose of adjusting the swirling number and the turbulence strength can be adjusted. The work range of the nozzle is wide, the swirling number and the turbulence of a flow field can be flexibly adjusted, the mixing effect is good, safety is good, pollutant emission is low, the fuel application range is wide, and good combustion stability is achieved.

The invention belongs to the field of wind power technology, and particularly relates to a wind farm turbulence optimization method and system. The method includes: acquiring turbulence intensity data in a main flow direction within a predetermined distance in front of an installation location of a wind turbine on the basis of CFD (Computational Fluid Dynamics) flow field analysis; and analyzing and determining, on the basis of the acquired turbulence intensity data and wind farm measurement data, a location and a flow-guiding height of a flow-guiding wind grid mesh of utilizing mesh flow-guiding to optimize turbulence, According to the method and system, a mesh flow-guiding scheme is utilized, airflow of a wind farm is optimized, the turbulence intensity is reduced, component damage and gear box and blade fatigue invalidation caused by violent vibration, due to the turbulence, of the wind turbine are reduced, and the safety of wind turbine running is improved.