5results about How to "Improve cavitation performance" patented technology

This invention discloses a design method and inducer for a liquid rocket engine turbopump. Based on the overall design requirements of the liquid rocket engine, the operating conditions of the inducer are determined. According to the design requirements and empirical formulas, the basic parameters of the inducer are initially determined. Based on the range of core parameters, different combinations of core parameters are used to establish multiple initial three-dimensional models of the inducer. Simulations are performed on each of the established initial three-dimensional models to obtain the cavitation performance of the inducer. Based on the flow analysis results, the inducer with the optimal blade profile among all parameter combinations is obtained. The selected inducer with the optimal blade profile is then optimized and adjusted until the liquid rocket engine turbopump inducer with the best cavitation performance is obtained. This invention can design a liquid rocket engine turbopump inducer with good cavitation performance.

The utility model discloses a flow-limiting orifice plate for a backflow pipeline of a nuclear power plant, relates to the technical field of transportation of fluid in a pipeline, and is used for solving the problems of violent vibration and noise of the pipeline caused by cavitation of an existing flow-limiting orifice plate for a pipeline of a safety facility system. The restriction orifice plate comprises an orifice plate and a handle arranged above the orifice plate, the pore plate is round, the thickness of the pore plate is 1 / 10-1 / 4 of the inner diameter of the pipeline where the pore plate is located, a round hole is formed in the middle of the pore plate, and a chamfer is arranged on one side of the round hole; the size of the chamfer is 1 / 2-2 / 3 of the thickness of the pore plate; and the flow-limiting orifice plate is mounted in the pipeline through an ASME standard flange. The flow state behind the pore plate can be improved by adopting the oblique-angle flow limiting pore plate, the pipe nozzle jet flow of the right-angle pore plate is changed into orifice diffusion flow, the lowest pressure P2 behind the pore plate can be further increased, the cavitation phenomenon behind the pore plate is weakened, and the cavitation performance of the pore plate is improved.

The application discloses a coal seam permeability enhancement system and method based on zeolite-assisted carbon dioxide intensification cavitation, and relates to the technical field of gas extraction. The method first segments and blocks the drilling hole through a packer, and under the premise of hydraulic fracturing, combines high-speed rotation of an impeller, heating and temperature rise, and cooperation of zeolite powder porous gas release foaming and carbon dioxide medium, breaks the micro-pore structure of the coal body by means of high-energy shock waves generated by bubble collapse, breaks the fracturing water lock effect and penetrates the coal seam fracture network, and greatly improves the overall permeability of the coal seam. Secondly, after injecting high-pressure carbon dioxide gas into the coal rock mass, the free gas and water in the pore and fracture are gradually displaced by the pressure pushing, adsorption displacement and seepage migration effect. The technical problems of limited improvement of coal seam permeability, low concentration of extracted gas methane, and inhibition of gas desorption by water lock effect after hydraulic fracturing are solved.

The present application belongs to the technical field of shaft flow pump seal flushing, and particularly relates to a machine seal flushing self-adaptive compensation system for a polyethylene shaft flow pump. The present application comprises a pump body with a pump cavity, and a front end bearing arranged in the pump body. The present application is characterized in that it comprises a compensation type piston cylinder with an axis arranged vertically, and a return cavity of the compensation type piston cylinder is located above a feed cavity. An oil inlet compensation pipeline is connected to the return cavity at one end and to a front end flushing pipeline where a high speed pump is located at the other end. A balance pipeline is connected to the feed cavity at one end and to a lubricating cavity where the front end bearing is located at the other end. The present application realizes an instant online compensation function of flushing liquid after interruption of flushing, thereby ensuring continuous lubrication and cooling effect of the bearing in the pump cavity and ensuring safety and continuity of high density polyethylene production.

The small-grain seed hole planting and seeding system belongs to agricultural machinery equipment, comprising a seed dispenser and a seed guiding mechanism, the seed dispenser comprising a seed box, a seed particle distribution chamber and an air blower, the lower opening of the seed box being located at the upper opening of the seed particle distribution chamber and forming a seed outlet at the connection position, the air blower being fixed to the outer wall of one side of the seed particle distribution chamber, the seed guiding mechanism being installed directly below the seed dispenser, the seed guiding mechanism comprising a mounting frame, a seed guiding chain, a driving motor II and a tensioning mechanism, a plurality of scoops being uniformly fixed to the outer side of the seed guiding chain. The device is technically integrated with the positive and negative pressure point seeding device and the scoop chain type seed guiding mechanism, can ensure that 3-5 seeds are filled into each type hole, form a uniform seed flow, and can realize accurate seed taking, stable seed conveying and accurate seed dropping, so that the migration track of the seeds from the seed dispenser to the seed furrow is accurately controllable, the deviation of the landing position caused by wind blowing and collision is avoided, the seed landing precision is improved, and the qualified rate of the hole seed number and the hole forming effect after the seed landing are improved.