98results about How to "Improve flow field distribution" patented technology

The invention discloses a method for optimizing ammonia nitrogen mole ratio distribution of an SCR denitration system. The method comprises the following implementation steps: detecting to obtain NOX concentration distribution within each control period at the inlet of the SCR denitration system and NOX concentration distribution and NH3 concentration distribution within each control period at the outlet; within each control period, calculating an ammonia nitrogen mole ratio distribution relative standard deviation factor CVm of the SCR denitration system within the current control period, and while the ammonia nitrogen mole ratio distribution relative standard deviation factor CVm exceeds a preset threshold value, automatically optimizing in allusion to an ammonia spraying control valve of the SCR denitration system, ending and quitting the automatic optimization while the ammonia nitrogen mole ratio distribution relative standard deviation factor CVm does not exceed the preset threshold value. The method is capable of effectively regulating the ammonia nitrogen mole ratio distribution of the SCR denitration system, solving the problems that the outlet ammonia escape rate of the SCR denitration system is high, the outlet NOX concentration distribution is not uniform and the produced ammonium bisulfate blocks an air pre-heater, remarkably improving the flow field distribution in an SCR reactor, and effectively improving the availability ratio of the SCR denitration system.

The invention provides a manufacturing method of a unimolecular sequencing chip. The manufacturing method includes the following steps: (1), taking a baseplate, and adopting a photoetching method to make an anodic film of a reaction tank array on the surface of the baseplate; (2), using model glue to pour the anodic film, curing for 1-3h at 90-100 DEG C after vacuum degassing, uncovering the anodic film to obtain a groove with multiple runners, punching a hole in each of two ends of each runner to form fluid input and output holes, and obtaining a substrate; (3), taking a transparent base, and preparing a polymethylglutarimide (PMGI) layer on the surface of the transparent base to obtain a transparent base with the surface modified; (4), subjecting the substrate and the transparent base to oxygen plasma cleaning and press-fitting, and injecting a reagent into each runner to clean the corresponding PMGI layer contacting with each runner to obtain the unimolecular sequencing chip. The manufacturing method is simple in process and low in manufacturing cost.

The invention discloses an experiment device and method for evaluating synthetic jet plate turbulent flow drag reduction. The device comprises a low turbulent flow static wind tunnel, a test platform,a force test balance, a smoke generator an LDV laser velocity measurement device, a synthetic jet plate turbulent flow drag reduction device, wherein the test platform is fixedly arranged in an experiment segment of the low turbulent flow static wind tunnel, and the test platform comprises a fixing support, a zero pressure gradient flat plate and a guide rail. The method is characterized in thatfirstly, the flat plate with zero pressure gradient is established in the wind tunnel, flow field distribution of the flat plate having no excitation device is detected, secondly, the excitation device is added to the flat plate, flow field distribution is detected when the excitation device is in a non-open state, and lastly, the excitation device is opened, flow field distribution is detected when the excitation device is in an open state. Friction resistances under different states are calculated through Spalding formula fitting, and the actual drag reduction effect of the synthetic jet plate turbulent flow drag reduction device is acquired through analysis. The method is simple for operation, and the method is suitable for measuring the drag reduction effect of various types of drag reduction devices.

The invention discloses a half-blade-rotor-type axial flow blood pump which comprises an inner barrel, a front guide, a rotor and a rear guide. The front guide has three straight blades, the rotor has two rotating blades, the two rotating blades of half-blade structures are distributed on a front half of a hub of the rotor only, and blade tip clearance length of the rotor is reduced by a half; the rear guide has three big rotating blades and three small rotating blades, the big rotating blades and the small rotating blades are distributed at intervals, each big rotating blade is provided with a suspension arm with one-half length, each suspension arm extends into a rotor area to form a suspension arm blade structure, and a runner portion on the outer surface of the rotor is made by smooth date-pit-shaped cubic spline curves. The half-blade-rotor-type axial flow blood pump has the advantages that a whole runner formed by the front guide, the rotor and the rear guide is designed to be of a date-pit-shaped structure, and the smooth cubic spline curves are adopted, so that pressure rise of the blood pump is increased, flow field distribution in the pump is improved, area of a rotating-stilling interface is reduced, and risk of thrombosis at a bearing is lowered.

The invention provides a single-molecule sequencing chip, which comprises a substrate and a base layer which is arranged in a mode of being laminated with the substrate, wherein the substrate comprises a first surface and a second surface which are oppositely arranged; a reaction tank array which is formed by a plurality of runners is arranged on the first surface of the substrate in a spacing mode; two opposite sidewalls of each runner extend in the length direction of the runner and are intersected at two ends of the runner to form two conical tail ends having included angles; fluid input holes and fluid output holes which are communicated with the second surface of the substrate are respectively formed in the surfaces of the two conical tail ends; the base layer comprises a transparent base and a spacing layer which is arranged on the surface of the transparent base; and the spacing layer is contacted with the first surface of the substrate and the spacing layer, corresponding to the locations of the runners, is formed with corrosion grooves. The chip is good in flow field distribution, the base in the chip is low in deformation rate and fluid in the chip is thorough in flushing switching.

The invention relates to a broad-width extrusion device and an extrusion technology. The extrusion device comprises an extrusion machine and a temperature measuring-cooling system. The extrusion device is characterized in that the extrusion machine is provided with flat extrusion cavity and a flat extrusion cylinder coat adaptive with the flat extrusion cavity; a guide way is arranged below an extrusion cylinder; a combined structure of a flat extrusion rod and an extrusion seat corresponding to the flat extrusion cavity is also arranged, and the extrusion rod is connected with a piston of a hydraulic cylinder through the extrusion seat; the height and the width of the combined surface of the extrusion seat and the extrusion rod are respectively equal to and no less than the corresponding size of the extrusion rod. The invention adopts the flat extrusion cylinder, uses a flat ingot as an extrusion blank and adopts the combined structure of the flat extrusion rod and the extrusion seat so as to realize high-efficiency extrusion of flat and broad-width proximate matter of large-specification magnesium alloy and aluminum alloy and obtain broad-width proximate matter or plank stuff with the breadth exceeding 750 mm. the invention especially overcomes the defects that the magnesium alloy rolling has low rolling yield and low production efficiency, and effectively realizes the extrusion production of ultra-breadth proximate matter and plank stuff/plate blank, which is difficultly completed by a ten-thousand-ton extruding press.

The invention relates to a rotary printing electrolytic machining liquid sealing device and method, and belongs to the technical field of electrolytic machining. The device comprises a liquid flushingclamp seat, an auxiliary sealing sleeve, a fixed cover plate, a stretchable cover plate and a follow-up cover plate wherein a main liquid flushing opening is formed in the back wall surface of the liquid flushing clamp seat, a liquid outlet is formed in the front wall surface of the liquid flushing clamp seat, and an auxiliary liquid flushing opening is formed in each of the left side wall and the right side wall; and the upper end of the auxiliary sealing sleeve is connected with a fixing shaft sleeve, and the lower end of the auxiliary sealing sleeve is connected with the stretchable coverplate and the follow-up cover plate, and cooperates with a tool rotating main shaft through a sealing ring so as to realize rotary sealing. During machining, liquid flushing is carried out at the main liquid flushing opening from the back to the front, liquid flushing is carried out at the auxiliary liquid flushing openings from the front to the back, and the liquid flushing pressure is not smaller than the liquid flushing pressure of the main liquid flushing opening, so that liquid sealing of flow channels of the non-machining areas on the two sides is achieved; and the auxiliary sealing sleeve, the follow-up cover plate and the stretchable cover plate move along with feeding of a cathode, so that it is guaranteed that the upper end face of a clamp is always sealed. According to the liquid sealing method, the flow field distribution of the machining area can be effectively improved, and the stability of rotary printing electrolytic machining is improved.

The invention discloses an electrode frame structure of single batteries in a redox flow battery as well as the single battery and an electric pile, wherein the structure of the electric pile is formed by sequentially combining a cover plate, an end plate, a collector plate, a plurality of single batteries, a collector plate, a shunt plate, a collector plate, a plurality of single batteries, a collector plate, an end plate and a cover plate, and the two cover plates arranged at the two ends are respectively fastened by a fastener in a mechanical way; an electrode frame assembly comprises a film frame and an electrode frame which are sealed by a sealing strip or a buckle, or in a combining way; the physical structure stability of an ionic membrane is greatly improved by the structure of the film frame in the assembly process, the electric pile is convenient to assemble, and the stability of an electric pile module is improved; due to the design that the film frame is integrated with the electrode frame, the distribution of a flow field is optimized, the contact resistance between the membrane and an electrode is reduced, and the battery efficiency is improved. The electric pile is formed by N half piles, so that the power of the single pile can be improved, the distribution uniformity of electrolyte of a main pipeline can be effectively guaranteed, the effects of pre-assembling and pre-checking the half piles for the assembly of the electric pile can be achieved, and the electric pile is convenient to maintain.

The invention discloses a stepped venturi mixer. The stepped venturi mixer comprises a mainstream fluid inflow pipeline, a contraction section, a throat part, a divergent section and a mixed fluid outflow pipeline as well as an inlet pipe which is arranged on the throat part and in which an introduced fluid flows; the contraction section and the divergent section are stepped; the stepped structure of the contraction section enables vortex to be generated in a mainstream fluid, and draws and absorbs the introduced fluid at the throat part; the stepped structure of the divergent section enables vortex to be generated in a mixed fluid consisting of the mainstream fluid and the introduced fluid. According to the invention, the turbulent intensity of the fluid in the mainstream venturi pipe is reinforced effectively; the phenomenon of non-even mixing is enhanced; the mixing efficiency is enhanced, so that the mixing effect of the mainstream fluid and the introduced fluid is enhanced obviously.

The invention discloses a cyclone separator of a circulating fluidized bed boiler with double eccentric central cylinders. The cyclone separator comprises a separator cylinder body, a separator conical body and a separator vertical pipeline which are communicated in sequence from top to bottom, the side part of the separator cylinder body is communicated with an inlet flue; the connecting part between the bottom of the inlet flue and the separator cylinder body is sunken inwards to form a smoke tail end accelerating opening; the double eccentric central cylinders are inserted into the top of the separator cylinder body. According to the cyclone separator of the circulating fluidized bed boiler with the double eccentric central cylinders, the separating efficiency of the cyclone separator is improved; the material circulating manner is optimized; the material concentration in a furnace hearth is improved; the bed temperature of a dense phase area of the boiler is reduced; the emission concentration of SO2 and NOx is reduced; the environment friendliness and economy of operation of the circulating fluidized bed boiler are improved; the cyclone separator of the circulating fluidized bed boiler with the eccentric central cylinders is suitable for integrated modification of newly-built machine units and on-service machine units.

The invention relates to a serial cascade stator structure of an artificial heart blood pump. The serial cascade stator structure comprises an expanding hub passageway and stator blades thereof; the expanding hub passageway adopts a streamline cubic spline curve passageway; the stator blades are composed of five blades at the front row and five blade at the rear row; a certain clearance is remained between the front edge of the blade at the rear row and the trailing edge of the blade at the front row; and the blades at the front and rear rows of the stator blades are arranged in the circumferential position structure as follows: the root part and the tip part of the front edge of the blade at the rear row are located at 35% of a circumferential angle between the blades at the front row. The structure design of the invention has higher blood-supply and pressure rising capability, can obtain better flow field distribution, improve the anti-hemolysis properties of the blood pump, and meet the requirement for embedding in heart failure patients in a short time or a long time.

The present invention discloses an experimental device and method of assessing dielectric barrier discharge plasma flat plate turbulent drag reduction. The device comprises a low turbulence silent wind tunnel, a test platform, a force measurement balance, a smoke generator, an LDV laser velocity measurement device, a dielectric barrier discharge plasma flat plate turbulence drag reduction device,and the test platform is fixedly arranged in an experimental segment of the low turbulence silent wind tunnel and comprises a fixing support, a zero-pressure gradient flat plate and a guide rail. Theprinciple of the method is that firstly the zero-pressure gradient flat plate is built in the wind tunnel to measure the flow field distribution when an excitation device is not arranged on the flat plate, and then the excitation device is added in the middle of the flat plate to measure the flow field distribution when the excitation device exists but is not turned on, and finally, the excitationdevice is turned on to measure the flow field distribution when the excitation device is added and is turned on. A Spalding formula is used to fit and calculate the friction resistance under different states, and the actual drag reduction effect of the dielectric barrier discharge plasma flat plate turbulence drag reduction device is analyzed. The method is simple to operate, and is suitable formeasuring the drag reduction effects of various drag reduction devices.

The invention relates to a radial flow adsorber. The radial flow adsorber mainly comprises a lower end socket, an upper end socket and a cylinder body, wherein the upper end socket is provided with an upper regeneration gas inlet pipe and an adsorbent feed port; the lower end socket is provided with an inlet pipe for gas to flow in; an adsorbent, a silk screen and a filter component are arranged in the cylinder body; and a lower regeneration gas inlet pipe which is communicated with the upper regeneration gas inlet pipe is also arranged on the lower end socket. In the invention, a design of double regeneration gas inlet pipes is utilized to improve the flow field distribution of fluid in the adsorber; and calculated by the flow field, the unevenness of the airflow flowing through the adsorber of such a structure is smaller than that of a conventional adsorber, which indicates that the gas is more evenly distributed in the adsorber of the structure, so that the obstruction is also relatively reduced, thus the radial flow adsorber has greater superiority as compared with the traditional adsorber.

The invention relates to the field of coal gasification technology, especially to a slag removal system and a method thereof. According to the invention, distribution of flow field around a slag removal pipe can be improved, instability and obstruction of slag removal due to uneven distribution of flow field are avoided, and potential safety hazards such as abrasion of a central jet pipe, etc. canbe avoided. The slag removal system comprises a gasifier, the bottom of which is provided with a gas distribution plate. A gas distribution plate zone is above the gas distribution plate. The bottomof the gas distribution plate extends downward to provide with a slag removal pipe, which penetrates through the bottom of the gasifier. A columnar slag removal channel which is communicated with thegas distribution plate zone is formed at the bottom of the gasifier and is communicated with a slag hopper system through a connection pipe nipple. One end of the connection pipe nipple, close to theslag removal pipe, is provided with an annular gas distributor, which is used for distributing gas to the gas distribution plate zone through the columnar slag removal channel. A swirl flow field is formed in the gas distribution plate zone, and ash and slag fall down under the action of the swirl flow field and are discharged through the slag hopper system.

The invention provides a deformable tuyere for inhibiting wind-induced vibration of a bridge. The deformable tuyere comprises a flexible framework, a flexible panel, an inhaul cable, a pulley, a rigidtip and a motor. The deformable tuyere for inhibiting wind-induced vibration of the bridge is an active pneumatic measure, and the geometrical shape of the tuyere can be adjusted according to the characteristics of incoming wind and the state of the bridge, so that the pneumatic shape of the bridge is changed, the wind resistance of the bridge is improved, and the problem of wind-induced vibration of the large-span bridge is solved.

The invention relates to a method for designing an observation type unmanned remote control diving instrument. The method includes the following steps: (1) performing type selection and designing on all the parts according to the functional demands of the observation type unmanned remote control diving instrument; (2) completing three-dimensional modeling and virtual assembly of the functional parts on the basis of Solidworks software; (3) designing a preliminary shape according the functional demands; (4) calculating the structural strength performance, calculating a body basic parameter if the structural strength performance satisfies the demand, and performing redesigning and type selection if the structural strength performance does not satisfy the demand; (5) determining if the statics and the dynamics reach a balanced state or not according to the calculated body basic parameter, performing type approval if so, and adjusting spatial layout and product type selection if not; and (6) using a control system to perform water pool experiment statics, dynamics, self-propulsion operability test after type approval. The advantages of the invention are that the method can design the observation type unmanned remote control diving instrument which is high in structural stability, is reasonable in structure layout, is excellent in sealing performance and heat dissipation performance.

The invention relates to a precharged particulate matter strengthened-removal system based on humidification and flow equalization. The precharged particulate matter strengthened-removal system sequentially comprises a liquid drop spraying device, a flow blocking and flow guiding combined flow equalization device, a charging strengthening and discharging device in the flue gas direction. The liquid drop spraying device comprises spray nozzles and a support. The support is arranged in the direction perpendicular to the flue gas. Parallel pipelines are installed on the support. The spray nozzles are arranged on the pipelines. The flow blocking and flow guiding combined flow equalization device comprises baffles with open holes. The porosity of each baffle is 40%-50%, and the diameter of each open hole is 30-60 mm. The charging strengthening and discharging device comprises polar lines. The polar lines are arranged behind the baffles, installed on a hanging frame and connected with a power supply. Flue gas humidification, uniform air flow distribution and a high-voltage electrostatic field are combined, distribution of a flue gas flow filed is optimized while charging of particulate matter is strengthened on multiple aspects, the efficiency loss caused by the nonuniform flow field to a follow-up emission reduction system is reduced, and efficient removing of the superfine particulate matter is guaranteed on multiple aspects such as the flow field, humidifying and discharging strengthening.

The invention provides an electron beam surface machining method realizing workpiece drag reduction and a plate with an anti-drag surface. The machining method comprises the following steps: 1, scanning the surface of a workpiece through an electron beam according to a scanning path diagram, and moving the workpiece at a proper speed in a direction perpendicular to the arrangement direction of angle pieces on the surface of the workpiece at the same time; and 2, repeating step 1 until machining is finished, so that a plurality of strip-shaped ribs which are parallel to one another are formed on the surface of the workpiece. According the machining method, low-power high-quality electron beam high-speed scanning is utilized, the surface of the workpiece achieves a sharkskin-like biomimetic micro-texture feature through scanning diagram design optimization and working table moving, and the plate with the anti-drag surface improves the fluid field distribution on the surface of the workpiece, realizes the anti-drag effect, and can be used in the important fields of aviation, aerospace and ships, including aircrafts, submersible vehicles and the like.

The invention relates to a rotary percussion oscillating jet type PDC drill bit, which comprises a drill body body, a pressure head, a single control channel monostable jet element and a plurality of flow channels arranged inside the element, the pressure head and the drill body. The pressure head seals the single-control channel monostable jet element in the drill body, and welds the single control channel monostable jet element at the lower end and the peripheral drill body into a whole. Nozzles with different diameters are arranged at the outlets of the common flow channels in the drill body. The asymmetric design of the monostable jet element with a single control channel enables the jet flow passing through the inlet of the jet element to stabilize the wall to the side connected to the large diameter nozzle. When the hammer hits the drill bit, the control channel is blocked by the hammer, so that the fluid medium entering the jet element suddenly switches to the side of the small nozzle, the internal pressure of the drill increases sharply and generates an instantaneous pulse jet powerfully flushing the bottom of the hole. The invention periodically generates High-frequency pulsed water jet can effectively reduce the difficulty of starting cuttings at the bottom of deep holes, improve the distribution of flow field at the bottom of the hole, and improve the removal effect of cuttings.

The invention relates to a tubular slurry bed reactor and a reaction system. The tubular slurry bed reactor is a reactor for preparing ethylene from high-concentration acetylene, comprising a sequentially arranged gas inlet section, a tube distribution section and an expansion section, wherein the gas inlet section is provided with a gas inlet for use in The reaction gas is passed into the tubular slurry bed reactor; the tubular distribution section is provided with a plurality of tubulars for reacting the reactive gas in the tubular distribution section to prepare ethylene, and the plurality of A gas distributor is arranged at the bottom of the tubes, and air holes are distributed on it; a gas outlet is arranged at the top of the enlarged section. In the tubular slurry bed reactor described in the present invention, each tubular is a small slurry bed, because the diameter of each tubular is relatively small and the height is relatively high, and the three phases of gas, liquid and solid can be mixed It is more uniform, increases the residence time, improves the gas-liquid flow field distribution, reduces the amplification effect, and enables the reaction to proceed more fully.