32results about How to "Improve flow field characteristics" patented technology

The invention discloses a flow distribution structure of a reactor of a nuclear power station. The flow distribution structure is used for distributing the flow of coolant of a cooled reactor core and comprises a reactor core lower supporting plate and an end-socket-shaped structure fixed on the reactor core lower supporting plate; and the end-socket-shaped structure comprises an end socket with drain holes. Compared with the prior art, the flow distribution structure of the reactor of the nuclear power station has the advantages that the shape of a coolant channel is changed through the end socket, so that characteristics of a flow field of a lower cavity are improved effectively, vertex shedding of reactor internals in the lower cavity is avoided, the flow of the coolant is distributed through the drain holes of the end socket, and uniformity of flow distribution of fuel assemblies entering the reactor core is perfect.

The invention discloses a proportional cartridge valve with variable flow gain, which comprises a valve sleeve, a hollow valve core with a damping hole, a control cover plate, a valve cover, a displacement transducer and a pilot control valve, and is characterized in that: the lower part of the hollow valve core is arranged in the valve sleeve and is linearly sealed with the valve sleeve; the upper part of the hollow valve core is matched with the control cover plate; the upper end of the control cover plate is connected with the valve cover; the displacement transducer is arranged on the valve cover; the pilot control valve is arranged on a side face of the control cover plate; a semicircular hole is machined on a port at the bottom of the valve core; and four symmetrical waist-shaped holes are machined on the valve sleeve. The invention has the advantages that: the proportional cartridge valve has small valve opening, low flow gain and high linearity, and high-precision linear control at low flow can be realized; the valve has large valve opening, high flow gain and high linearity, and high-precision linear control at high flow can be realized; and due to low flow fluctuation and low pressure shock of the valve, the service life of the valve can be prolonged.

The present invention discloses a device for detecting blood cells and a microscopic hole sensor assembly thereof. The device includes a microscopic hole sensor assembly positioned between a front pool and a back pool. The microscopic hole sensor assembly further includes a microscopic hole plate with a microscopic hole positioned thereon for communicating the front pool and the back pool. The end surface of the inlet is a flow-guiding surface gradually narrowing from the front pool to the back pool. The end surface of the outlet is a downstream surface gradually distending and extending towards the back pool. A straight effective orifice area is formed connecting the ends of the flow-guiding surface and the downstream surface.

The invention discloses an ultrasonic plasma gun feeding powder internally, which is designed by adopting a parameterized structure design method in combination with a numerical simulation technique. The ultrasonic plasma gun mainly comprises a cathode, an anode, a powder feeding air flow channel, and a main air flow channel formed by matching the cathode with the anode. The mechanical compression effect of a nozzle is adjusted by changing the parameter of each pore canal in the internal compression segment and expanding segment of an anode nozzle, so that plasma jet flow in the gun is high in energy density and speed, the thermal efficiency of the gun is increased, and meanwhile the stability of arc voltage is ensured. The internal powder feeding angle is changed to an optimal position, so that heating and acceleration of sprayed powder materials are facilitated, and the problem of blocking of the gun nozzle is solved. The size of the gun is selected on the basis of an advanced computer simulation technology, so that the development period of the gun is shortened greatly, and the design cost is lowered. As proved by results, the novel gun has higher flow field characteristic than an original structure.

The invention relates to a low-noise diversion volute of a range hood. The low-noise diversion volute comprises a volute body, an impeller is mounted in the volute body, and the upper outlet of the volute shell is connected with the range hood through a flange; the volute body comprises a volute plate which is enclosed to form an annular diversion space, and the inversion space is provided with a notch; volute protecting plates are respectively mounted on axial sides of the diversion space, each volute protecting plate is provided with an air inlet, and upper ends of the volute protecting plates and the notch end of the volute plate are enclosed to form an outlet; a curved-surface diversion structure is mounted on the outer side of the volute plate and comprises a diversion plate and supporting plates symmetrically located at two ends of the diversion plate, and two sides of the supporting plates and two sides of the diversion plate are respectively fixedly connected between the volute protecting plates. Airflow resistance of the range hood is effectively reduced through combination of guidance of the curved-surface diversion structure and guidance of the circular-arc surfaced volute plate, the situation of turbulent flow is improved, and flow-induced noise outside the volute and aerodynamic noise of the impeller are reduced.

The invention provides a wind tunnel test section model support structure with a front edge bionic noise reduction structure. The wind tunnel test section model support structure sequentially comprises a 10-degree cone of a model support and a bent knife tightly connected with the 10-degree cone from the upstream to the downstream of airflow. The front edge part of the bent knife structure has a certain wedge degree, and the remaining parts are equal in thickness. The bent knife is in a smooth streamline shape and is in mirror symmetry about the axis of the 10-degree cone. The bent knife structure is tightly connected with the 10-degree cone. When a wind tunnel works, airflow passes through a contraction section and enters a test section, and in the test section, the airflow firstly flows through the test model supported on the model support and then flows through the 10-degree cone and the bent knife; and then the airflow enters the wind tunnel diffusion section. The part, not connected with the 10-degree cone, of the bent blade front edge is designed to be of a sawtooth-shaped structure or a wavy structure, the two bent blade front edge structures reduce front edge interference noise by weakening the response of the bent blade to incoming flow turbulence, tail edge self-noise is restrained by influencing the stability of a boundary layer through a flow direction vortex at a wave trough, background noise of a wind tunnel test section is reduced, and the acoustic performance of the wind tunnel is improved.

The invention discloses a grid for improving wind parameter characteristics of a turbulent flow field in a wind tunnel test, and the grid improves the wind parameter characteristics of the turbulent flow field through improving the shape of a square blank, firstly, a hexagonal accessory plate is pasted at the midpoint of the lattice edge of each grid, and the hexagonal accessory plate extends towards the square blank to form a right triangle shield, and thus all the square spaces are transformed into X-shaped spaces; and secondly, an octagonal accessory plate is adhered to each grid node, so that a right-angled triangle is formed at one corner of each square space for shielding, and all the square spaces are transformed into octagonal spaces. Experiments prove that the integral scale of a turbulent flow field can be greatly improved, the steady flow intensity of a wind field is improved, the transverse uniformity and correlation are improved, and the flow field characteristics of the grid turbulent flow field are improved.

The invention discloses a high-flow compact interstage air entraining method of a centrifugal compressor and aims to provide an air entraining design scheme which has the advantages of simplicity, high efficiency and compact size. The high-flow compact interstage air entraining method is characterized in that air entrained flow, the flow of primary air and entrained air in a backflow device and the characteristics of a flow field of an outlet of a mixed section are comprehensively analyzed, and air is entrained in the middle section of a blade of the backflow device, so that the design cycle is shortened, the production process is simplified, and materials are saved, thereby reducing the production cost of a unit.

The invention relates to wing surface fusion-type edge strips (1) which are attached to the outer side of an aircraft fuselage and the front ends of aircraft wings (2), when the wing surfaces of the aircraft wings (2) are in an open state, the wing surface fusion-type edge strips (1) and the wing surfaces of the aircraft wings (2) are in a separated state, when the wing surfaces of the aircraft wings (2) are in a closed state, the wing surface fusion-type edge strips (1) and the wing surfaces of the aircraft wings (2) are connected, and the boundary of the connecting joint part reaches the maximum thickness of the wing profile of the upper wing surface of the aircraft wings (2), so that the upper surfaces of the fusion-type edge strips (1) and the upper wing surfaces (2) of the aircraft wings (2) form a second order curvature continuous curved surface. The wing surface fusion-type edge strips can improve the flow field characteristic of the upper wing surfaces of the wings (2), the wing surface lifting force is increased, the maneuvering ability of the whole aircraft is improved, the whole aircraft resistance is effectively reduced, the supersonic cruise lift-drag ratio of the whole aircraft is increased, and the supersonic cruise and penetration ability of the whole aircraft is effectively improved.

The invention provides a humidifying and silencing ventilation pipeline device. A plurality of supporting racks are included and arranged in a ventilation pipeline. The section of each supporting rackis in a symmetric streamline shape, the head-tail direction of each supporting rack is kept to be consistent with the gas flowing direction, and gas jet flow flows towards the tails of the supportingracks from the heads of the supporting racks. An inner pipeline is arranged on the inner side of the front portion of each supporting rack, and a plurality of water spraying holes are formed in the wall faces of the two sides of the front portion of each supporting rack, wherein the inner pipeline comprises a driver, a transmission rod, a supporting pipe, an inner water conveying pipe and a rotary water spraying pipe, water can be sprayed from the positions of the water spraying holes, and the water spraying direction can be adjusted. Drying layers are arranged on the two sides of the rear portion of each supporting rack, water discharging grooves are formed in the lower positions of the drying layers, and the drying layers can absorb water of the surrounding environment and discharge water into the water discharging grooves. The water discharging grooves communicate with a water discharging pipe outside the ventilation pipeline. According to the humidifying and silencing ventilationpipeline device, on the basis of optimizing of the pipeline inner gas flow field, the humidifying noise lowering technology is utilized, spreading of noise in the ventilation pipeline is restrained, and background noise is lowered.

The invention discloses a novel self-adaptive vortex suppression control wind turbine tower structure. The novel self-adaptive vortex suppression control wind turbine tower structure comprises a tower, a cabin fixedly connected with the tower, a hub arranged on the cabin, blades fixedly connected to the hub, a plurality of bearings connected to the tower in a sleeving mode and side plates fixedly connected to the bearings. The tower is fixedly connected with two oppositely-arranged connecting rods, the connecting rods extend into the cabin, and the ends, located in the cabin, of the connecting rods are fixedly connected with tail vanes. According to the invention, the generation of the periodic Karman vortex street is limited, resonance is avoided, the stability of the tower is enhanced, external energy input is not needed, the structure is simple, and the method is simple and feasible.

The invention provides a shell and tube heat exchanger. A U-shaped heat exchange tube system arranged in n layers from the inside to the outside is arranged in the heat exchanger, the layers of the U-shaped heat exchange tubes are arranged in parallel, and two ends are fixedly connected with a tube system end tube plate. An anti-collision limit unit is arranged between the layers of the U-shaped heat exchange tubes respectively and comprises two location plates and n+1 separation rods. The two location plates are arranged on the two sides of the U-shaped heat exchange tube system, and the ends are fixedly connected with the tube system end tube plate. Installation grooves of the separation rods are formed in the corresponding positions in the two location plates which are detachably connected with the separation rods, and the separation rods are arranged before and after each layer of the U-shaped heat exchange tubes to separate the adjacent U-shaped heat exchange tubes. The shell and tube heat exchanger has the advantages that good flow field characteristics are provided, and vortexes are reduced; limit is performed effectively, and scratching of the tube walls is prevented; the requirement for assembly size is not high, and the practicality is high; the limit is flexible, cutting and tube flattening processes of tube sections are reduced, the efficiency is improved, the cost is reduced, and the cost performance is high.