18results about How to "Reduce turbulence intensity" patented technology

The utility model provides a wind resistance balancing wing plate, which belongs to the technical field of balancing wing plates, and comprises a wing plate main body, the wing plate main body is divided into a front edge, a wing-shaped middle part and a rear edge along the spanwise direction, the wing plate main body is provided with a sawtooth structure, the sawtooth structure is continuously arranged triangular sawteeth, and the triangular sawteeth are arranged in the wing plate main body. The sawtooth structures are integrated on the edge of the wing plate body to form an integrated structure, the vertex of each sawtooth is located on the edge line of the wing plate body, gears of the sawtooth structures are arranged in a staggered mode, and the sawtooth structures are continuously distributed along at least one side edge of the wing plate body. The sawtooth structures are continuously distributed along the edge of at least one side of the wing plate body, preferably distributed on the edges of the two sides, so that the airflow optimization effect is maximized, turbulent flow of a traditional wind resistance balance wing plate is reduced, the smoothness of airflow is improved, and therefore wind resistance is reduced, and stability and efficiency are enhanced.

The invention discloses a natural gas transportation pipeline drag reduction structure, an optimization method and a system, and relates to the field of pipeline structures. The problems that groove drag reduction in the field of natural gas pipeline transportation aims at small-diameter pipelines, most grooves are in a traditional v shape, and the drag reduction effect is not remarkable enough are solved. The resistance reduction structure comprises a plurality of semicircular groove structures with alternate widths and widths; wherein the width of the wide groove is twice that of the narrow groove. The optimization method comprises the following steps: establishing a smooth pipeline and a model with a wide-narrow alternate semicircular groove on the wall surface; carrying out structured grid division on the smooth pipeline and the wall surface with the wide and narrow alternate semicircular grooves; numerical simulation is conducted through Fluent fluid simulation software, and a turbulent flow structure in the pipeline is obtained; and the drag reduction rate is calculated, and the final natural gas transportation pipeline drag reduction structure is determined according to the drag reduction rate. By reducing the resistance, the amount of conveyed gas can be increased under the same energy consumption, or the energy consumption is reduced under the condition of keeping the same flow, so that the overall conveying efficiency is improved.

The invention relates to the technical field of ship overall arrangement, and discloses a living building and chimney arrangement method which comprises the following steps: step 1, simulating turbulence intensity distribution of a flow field around a chimney to obtain turbulence intensity distribution of the flow field; 2, drawing a curve graph of the maximum turbulence kinetic energy kappa of the flow field and the change of the kinetic energy E of the fluid medium under the condition that the spacing ratio gamma of the distance from different chimneys to the living building to the characteristic length of the chimney in the flow field is, selecting a natural logarithm lnE of which E is equal to 0.5 rho v2 as an axis and a turbulence intensity peak value kappa as another axis, obtaining a change curve of turbulence intensity with different gamma values along with wind kinetic energy; and 3, selecting a gamma curve characteristic value with relatively small turbulence energy as a principle for optimizing the arrangement method of the living building and the chimney. The device can simply and effectively simulate the accumulation concentration of the flue gas discharged by the chimney, so that the chimney and the living building are arranged, accumulation of chimney tail gas near the living building can be effectively reduced, and the problem that the living building area is affected by the tail gas discharged by the chimney is effectively solved.

The present invention belongs to the field of fish passing facilities, and relates to a multi-vertical slit fishway with V-shaped baffles and short baffles, including a bottom plate, a side wall surface, a long side baffle, a V-shaped baffle, and a short side baffle. The present invention reasonably arranges the V-shaped baffles and the short baffles so that the water flow is diverted and converged after entering the fishway, so that the water flow is fully mixed, the water flow energy is effectively dispersed, and the flow velocity and turbulent kinetic energy in the pool chamber are reduced. Two symmetrically distributed vertical slit channels are provided in the pool chamber, which can adapt to changes in different water levels, meet the migration needs of different fish, and improve the use efficiency of the fishway. The present invention is not only conducive to the smooth migration of fish with weaker swimming ability, but also can ensure effective operation under low flow, and has significant economic benefits for areas with scarce water resources or high power generation demand.

The invention discloses an axial flow pump double-layer flow channel structure capable of resisting blade top leakage. The axial flow pump double-layer flow channel structure comprises an inlet outer cylinder, an outlet outer cylinder and an impeller. An inlet inner cylinder is arranged on the inner side of the inlet outer cylinder, a circulation channel A is formed between the inlet outer cylinder and the inlet inner cylinder, a double-layer flow channel partition plate is arranged on the inner side of the outlet outer cylinder, and a circulation channel B is formed between the double-layer flow channel partition plate and the outlet outer cylinder; front guide vanes are evenly arranged on the outer wall of the inlet inner cylinder in the circumferential direction, and rear guide vanes are evenly arranged on the outer wall of the double-layer flow channel partition plate in the circumferential direction. A double-inlet structure is innovatively designed, during double inlets, leakage flow is restrained, most of the leakage flow acts on main flow in a gap between the inner cylinder and the outer cylinder, the flowing direction of the main flow in the inner cylinder is basically consistent with the axis, and the main flow in the inner cylinder is distributed uniformly; therefore, the double-inlet structural form can restrain the main reason of the unstable characteristic of flow and lift of the axial flow pump, and the flow field distribution on the upstream of the blade inlet edge is protected.

The invention relates to the technical field of civil engineering, in particular to a self-adaptive wind shielding device for improving the wind resistance of a bridge and a regulation and control method thereof.The self-adaptive wind shielding device for improving the wind resistance of the bridge comprises two wind barrier stand columns and a plurality of wind barrier strips rotationally connected between the two wind barrier stand columns; each wind barrier strip is provided with a plurality of air inlets, and a self-adaptive pore regulator is inserted in each air inlet. In the using process, the wind shielding device can flexibly adjust the shapes and the porosity of the air inlets in the transverse wind barrier strips at different heights according to changes of the external wind environment, the ventilation rate between the transverse wind barrier strips at different heights can be changed, and therefore cooperative regulation and control of the shapes and the porosity of the air inlets and the ventilation rate between the transverse wind barrier strips are achieved; the bridge can actively adapt to changes of different wind environments, and the running safety of a train is guaranteed; meanwhile, the wind shielding device further has the advantages of being durable, convenient to disassemble and assemble, capable of being recycled and the like.

The invention provides a fine fraction flotation machine with an inflation system and a using method of the fine fraction flotation machine. The fine fraction flotation machine comprises a groove body, a foam groove, a scraper component, an ore pulp annular pipe, an air annular pipe, a plurality of inflator assemblies and a tailing box. The ore pulp ring pipe and the air ring pipe are concentrically arranged at the top of the tank body, and the inflator assemblies are evenly arranged along the ore pulp ring pipe and used for fully mixing ore pulp and air in a pipeline and shearing the mixture to form fine bubbles, and then the fine bubbles are evenly sprayed into the cross section of the tank body through the branch pipes. No mechanical stirring exists in the tank body, turbulent flow is rapidly weakened after mixed fluid enters the tank body, and efficient static separation of mineralized bubbles and gangue minerals is achieved. The collision probability and the recovery rate of fine-grain minerals can be remarkably improved, gangue entrainment is effectively restrained, the concentrate grade is guaranteed, the inflation amount is adjustable, the structure is simple, operation is stable, and the flotation device is suitable for flotation operation of the high-concentration fine-grain minerals.

The utility model relates to a kind of labyrinth regulating valve.The conventional regulating valve is under high pressure difference, high flow rate and strong corrosion, strong cavitation condition, there is a series of technical bottleneck.The utility model is composed of sleeve forging valve body and forging valve cover by basic pressure-bearing shell, valve seat is installed in the sleeve forging valve body, characterized in that the upper end of the valve seat is provided with labyrinth disc piece assembly, labyrinth disc piece assembly is connected with labyrinth sleeve, labyrinth sleeve is structured using multilayer nesting form, and the inside is provided with staggered arrangement middle layer sleeve flow channel.The utility model can solve the problems of severe erosion, cavitation prone, high noise, low regulation accuracy and poor structural adaptability of conventional regulating valve under high pressure difference and high flow rate conditions.

The invention discloses a vehicle which comprises a cargo tank, and the cargo tank comprises a cargo tank front plate and a cargo tank top plate. The vehicle head comprises a vehicle head ceiling; the vehicle further comprises a guiding device for guiding airflow. The guide device is mounted on the container; and at least part of the guide device is higher than the container top plate, so that the airflow separation point is lifted and moved backwards relative to a transition area of the container front plate and the container top plate. When a vehicle runs, airflow encounters the situation of sudden path change or overlarge air pressure on the surface of the vehicle, a turbulent flow area can be generated on a container top plate, and pulsating pressure generated by the turbulent flow area causes deformation vibration of the container top plate to generate noise. And the separation point of the air flow can be lifted and moved backwards, so that the turbulence area is lifted, and the vibration of the container top plate caused by pulsating pressure is obviously reduced.

The utility model discloses a kind of guide vanes for EGR pipe, it is related to automobile exhaust treatment technical field.The utility model includes mounting sleeve, the first installation ring is fixedly connected in mounting sleeve inside;The first installation ring one side is provided with limiting mechanism.The utility model is meshed with the tooth block of the inner ring of limiting ring and the tooth slot of installation disc outer ring, can effectively limit the axial displacement and unexpected rotation of installation disc under the action of airflow, avoid the unstable problem of guide flow caused by jumping or shaking of turbine blade, the air outlet channel being set between limiting ring and mounting sleeve, high-speed exhaust can be guided to flow to the working area of turbine blade, reduce airflow dispersion loss, the hollow structure of wind deflector and two side slope design, airflow entering mounting sleeve can be primarily rectified, reduce intake turbulence intensity, reduce airflow and pipe wall collision loss, further reduce pressure loss, improve guide efficiency.

This application provides a novel ship control hull mold casting system, relating to the field of metal casting molds. It includes a gating structure on one side of the cavity and an venting structure on the remaining sides of the cavity. The gating structure is stepped, positioned at the top of the cavity and higher than the cavity itself. The gating structure includes a riser, a main channel, two branch channels, and multiple sub-channels connected sequentially along the pouring direction. The two branch channels extend obliquely to both sides from the ends of the main channel, with their widths gradually decreasing. Each branch channel branches out two spaced sub-channels on its side facing the cavity. The height of the sub-channels gradually decreases, and their width gradually increases at their ends. The height of the sub-channels is lower than the height of the branch channels, and the height of the branch channels is lower than the height of the main channel. The venting structure includes multiple venting slag bags spaced apart and connected to the bottom of the outer side of the cavity. This application effectively solves the technical problems of turbulence and slag inclusions easily generated by traditional flow channels.

The invention discloses a marine methanol dual-fuel staged atomization burner, and relates to the technical field of heat energy engineering. Core components of the invention comprise an air bellow, a door plate assembly, a methanol valve box, a main fuel gun, an ignition gun, a swirler, a metal throat assembly and the like. The combustor controls atomization of methanol and other fuels through a flow divider and an atomizing nozzle, and stable fuel flames are achieved through a swirler. The atomizing nozzle is of a graded Y-shaped structure, the spraying holes can be adjusted according to different fuels, and different spraying requirements of fuel oil and methanol are met. The combustor is divided into three stages to support combustion through precise matching of combustion-supporting air, pipeline blowing air and a fuel inlet, and the efficient and low-pollution combustion process is ensured. Combustion-supporting air forms secondary rotational flow through the swirler, scouring of backflow smoke to the nozzle is reduced, and it is guaranteed that the core flame of the combustor is stable. The metal throat component controls the diameter of combustion flame and ensures uniform combustion.

The utility model relates to a condensing heat exchanger and a gas water heater. The condensing heat exchanger comprises a shell; the heat exchange tube is arranged in the shell, and the heat exchange tube is provided with a water inlet end; the expansion box body is provided with a water flow expansion cavity, a water inlet and a water outlet, the water inlet and the water outlet are communicated with the water flow expansion cavity, the flow section area of the water flow expansion cavity is larger than that of the water inlet and that of the water outlet, and the water outlet is communicated with the water inlet end. According to the condensing heat exchanger, due to the fact that the water flow expansion cavity is arranged between the water inlet and the water outlet of the expansion box body, and the circulation cross-sectional area of the water flow expansion cavity is larger than that of the water inlet and that of the water outlet, cold water flows into the heat exchange tube after passing through the expansion box body in a pressure reduction mode, and the expansion box body can reduce turbulence intensity of outlet water of a water pump. Water outlet pressure pulsation of the water pump is attenuated, so that vibration amplitude and resonance intensity of the heat exchange tube are reduced, and noise can be effectively reduced.

The utility model relates to the technical field of building ventilation systems, in particular to a noise reduction structure of a fresh air system pipeline. The utility model provides a fresh air system pipeline noise reduction structure which comprises a pipeline body and a noise reduction assembly, the noise reduction assembly comprises a plurality of noise reduction units arranged at intervals in the axial direction of the pipeline body, and each noise reduction unit is composed of a supporting frame, a porous sound absorption layer, a resonant cavity array and a flow guide cone. The supporting frame is the same as the inner wall of the pipeline body in shape and is fixed to the inner wall of the pipeline body, the porous sound absorption layer is attached to the inner side of the supporting frame, the resonant cavity arrays are located on the two sides of the porous sound absorption layer, and corresponding clamping grooves are formed in the positions, located on the porous sound absorption layer, of the supporting frame. The two ends of the resonant cavity array are fixed to the clamping grooves of the adjacent supporting frames respectively, the flow guide cone is located in the center area of the porous sound absorption layer, and the cone top of the flow guide cone points to the airflow direction.

The invention provides a circulating heat management method and system for liquid flow conduction, and relates to the technical field of heat exchange. According to the specific implementation scheme, a plurality of candidate geometric structures of the U-shaped heat exchange elbow pipes are designed, flow field simulation is carried out, the flow field distribution conditions of all the candidate U-shaped heat exchange elbow pipes are obtained, and therefore the flow field distribution conditions of all the candidate U-shaped heat exchange elbow pipes are calculated based on the flow field distribution conditions of all the candidate U-shaped heat exchange elbow pipes. According to the embodiment of the invention, the correlation equation between the heat exchange elbow structure and the local turbulence intensity can be determined, then the candidate geometric structures are optimized based on the correlation equation and the actual turbulence intensity distribution of the U-shaped heat exchange elbow, and the target geometric structure capable of optimizing the actual turbulence intensity distribution of the U-shaped heat exchange elbow and achieving the optimization target is obtained. And on the basis of the target U-shaped heat exchange bent pipe corresponding to the target geometric structure, the U-shaped heat exchange bent pipe in the liquid flow conduction system is replaced. According to the invention, the heat transfer efficiency of the liquid flow conduction system can be improved.

The utility model relates to kitchen electrical equipment technical field, concretely discloses fan and table type range hood, the fan includes volute and noise reduction subassembly, volute is provided with air outlet, and the side wall of air outlet is connected with volute tongue, the noise reduction subassembly is divided into at least two sub air ducts with air outlet, and the direction from the side wall of volute tongue connected with air outlet to the other side wall opposite volute tongue, at least two sub air ducts are sequentially arranged. When the fan works, the airflow with high speed and strong periodic pulsation flows from the impeller area to the air outlet of volute, because the noise reduction subassembly divides the air outlet into at least two sub air ducts, and then makes the originally concentrated, large-scale air outlet airflow to be divided into multiple independent airflow with smaller scale, brings the effect of turbulence suppression and pulsation attenuation, makes the airflow flow more tends to laminarization and homogenization, and then effectively reduces the noise at the air outlet of fan.

The present invention discloses a petal-shaped heat exchange enhancement structure and a heat exchange tube, comprising a trunk, the trunk is formed by spirally weaving a double-strand wire, a petal-shaped split wire is arranged on the trunk along the axial direction, each node position of the trunk is provided with a petal-shaped split wire, the double-strand wire is added with the petal-shaped split wire during the spinning process, the double-strand wire and the petal-shaped split wire are woven into one body, two adjacent groups of petal-shaped split wires are staggered, the petal-shaped split wire is hollow and streamlined, the petal-shaped split wire is made of petal-shaped split wires and the transition part is connected by a smooth curve, and the petal-shaped split wire is elastic. The present invention uses the petal-shaped split wire to make the fluid in the central area of ​​the heat exchange tube flow along the petal edge to the tube wall area, reduce the turbulent intensity of the fluid, avoid most of the invalid disturbances, and reduce power consumption; the petal-shaped split wire has its own elasticity, can expand after being inserted into the heat exchange tube and fit closely with the inner tube wall of the heat exchange tube, and no auxiliary installation parts are required; the structure is simple, the processing process is simplified, the processing efficiency is high, it is not easy to accumulate dirt, and it is easy to replace.

The present invention provides a fan blade assembly and an air conditioning unit. The fan blade assembly includes a fan blade; a guide ring, the guide ring is located on the air inlet side of the fan blade, and part of the guide ring extends into the fan blade; a protrusion structure, the protrusion structure is arranged on the outer wall of the guide ring, and the protrusion structure is located outside the fan blade, a leakage channel is formed between two adjacent protrusion structures, and one end of the leakage channel faces the fan blade. The fan blade assembly and air conditioning unit provided by the present invention are provided with a protrusion structure on the outer wall of the guide ring, and the protrusion structure is used to fill the gap between the outer wall of the guide ring and the wheel cover of the fan blade, thereby reducing the leakage loss between the wheel cover and the guide ring, weakening the turbulence intensity generated during the intersection of the leakage airflow and the mainstream, thereby reducing the impact loss at the fan blade inlet, and achieving the purpose of improving the performance and efficiency of the fan system and reducing the noise of the fan assembly.