105results about How to "Improve stable working range" patented technology

The invention discloses a low-pollution combustor for various fuels, which comprises a shunt system, a mounting edge and a plurality of double fuel nozzles, wherein the shunt system is connected with the plurality of double fuel nozzles through the mounting edge into a whole; the shunt system comprises a gas fuel subchannel, a liquid fuel subchannel, a diluent subchannel and an atomized air subchannel; and the double fuel nozzles are arranged circumferentially along the central line of the combustor. The low-pollution combustor for various fuels provided by the invention reduces the dischargeof pollutants such as NOX, solves the problems such as backfire and unstable combustion of premixing combustion of synthetic gases, simplifies an air cleaning and blowing protective system of a combustion chamber, avoids increasing the discharge of carbon monoxide, and can work with low and medium thermal value gas fuel such as coke oven gas, chemical tail gases and synthetic tail gases from IGCCpower plants and high thermal value gas fuel such as diesel oil and natural gas.

The invention relates to a lean oil direct injection and mixing low-pollution combustion chamber. The lean oil direct injection and mixing low-pollution combustion chamber is composed of a diffuser, acombustion chamber outer case, a combustion chamber inner case, a combustion chamber head, a flame tube outer wall and a flame tube inner wall, wherein combustion air all enters a flame tube from thecombustion chamber head; the combustion chamber head is divided into an on-duty grade and a main combustion grade through a grading and partitioning combustion strategy; the on-duty grade and the main combustion grade both adopt a direct injection and mixing combustion method, the phenomena of spontaneous combustion and tempering are effectively avoided, and the risk of occurrence of oscillationcombustion is lowered; the lean oil direct injection and mixing low-pollution combustion chamber only works in an on-duty grade mode under an idling rating state, the designed partial equivalence ratio is higher, and the work stability of the combustion chamber is guaranteed; and with the increase of the work state of the combustion chamber, the main combustion grade is opened gradually, the maincombustion grade and the on-duty grade work simultaneously under a large state, the designed combustion area average equivalence ratio is lower, the average temperature of the combustion area is effectively lowered, and therefore the generation quantity of pollutants is lowered.

The present invention discloses a processor case with non-rectilinear slot on it and adopts banana-shaped structure or structure of linear that connected with arc segments. A compressor includes a processor case, rotor blade, stator blade, dish of wheel, stator inner loop and axis; the processor case includes organic case body and process ring, wherein one end of the stator blade connects with the stator inner loop and the other end connects with the organic case body; one end of the dish of wheel connects with the rotor blade while the other end connects with the axis; the process ring connects with the organic case body; the invention is characterized in that a process cavity is formed inside the case body and the process ring; the rotor blade rotates and air draft flows in from the process ring and circulates inside the process cavity, then flows out from the process ring. The present invention changes structure of traditional cases, improves performance, expands stable work margin of the processor case, and can be applied on aerial engine shaft pressured gas flow development work and has a broad application prospect.

The invention discloses a treatment casing with an adjustable grooving width of a centrifugal air compressor. The casing comprises a self-circulation casing channel formed in a volute, and an adjustment device with the adjustable grooving width, wherein the adjustment device comprises a hollow cylinder, a cam structure and a spiral spring; the hollow cylinder is arranged in a flow guide ring groove and moves along the flow guide ring groove; and the cam structure comprises a cam, a cam shaft and a sealing hollow structure arranged on the upper part of the cam shaft, the interior of the sealing hollow structure is divided into two chambers, each chamber is connected with an air guide pipe, and the other ends of the air guide pipes are connected to the different positions in the circumferential direction of the volute. The cam shaft is pushed to rotate through the pressure difference of the two chambers to drive the hollow cylinder to move, so that a casing design that the width of a suction ring groove is adjusted with the working condition of the air compressor. According to the technical scheme of the invention, compared with a self-circulation treatment casing with a fixed-width suction ring groove, the width of the suction ring groove can be adjusted, so that the stable working range of the centrifugal air compressor can be greatly expanded, and the pressure ratio and the adiabatic efficiency of a part of working conditions are increased.

An asymmetric self-circulation processing machine box of a centrifugal compressor with parabolic grooving widths relates to a processing machine box of the centrifugal compressor and belongs to the technical field of impeller machineries. A self-circulation channel is formed by installing a pumping ring groove, a reflux ring groove and a flow guiding ring groove on the wall surface of a turbine shell of the compressor, the widths br values of the pumping ring groove are distributed in a parabola shape in the circumference direction to optimize the expanding stability effect of the asymmetric self-circulation processing machine box on the centrifugal compressor. By adopting the asymmetric self-circulation processing machine box of the centrifugal compressor with the parabolic grooving widths, compared with an axisymmetric self-circulation processing machine box with coincident grooving widths in the circumference direction, the stable working range of the centrifugal compressor can be greatly increased, and the efficiency remains almost unchanged.

The invention discloses a centrifugal compressor with an asymmetrical vaneless diffuser and an automobile with the centrifugal compressor. The centrifugal compressor comprises a volute, a vane wheel and the vaneless diffuser. The volute comprises a first shell portion and a second shell portion, wherein the first shell portion and the second shell portion are mutually communicated, a volute chamber is defined inside the first shell portion, and a vane wheel installation space is defined inside the second shell portion. The vane wheel rotates around a rotating shaft and is arranged inside the vane wheel installation space in a rotatable mode. The width of the vaneless diffuser is distributed in a non-axis-symmetrical in the circumferential direction. The vaneless diffuser comprises a maintaining segment and a transition segment, the outlet end of the maintaining segment is communicated with the first shell portion, the inlet end of the maintaining segment is communicated with the outlet end of the transition segment, the inlet end of the transition segment is communicated with the second shell portion, the width of the maintaining segment is even at the same circumferential position in the radial direction, and the width of the transition segment is uneven at the same circumferential position in the radial direction. The centrifugal compressor with the asymmetrical vaneless diffuser can reduce the non-axis-symmetrical property of a flow field of the fluid inside the centrifugal compressor and broaden the stable working range of the centrifugal compressor.

Provided is a filamentous arc plasma exciter based on swirl holes. An inner layer plasma swirler and an outer layer swirler are of a split type structure. The plurality of swirl holes are evenly distributed in a shell body of the inner layer plasma swirler. Two to five electrodes are disposed in the swirl holes through electrode installing bases correspondingly and divide the circumference of theshell body of the inner layer plasma swirler into n equal-length arc sections. The outer layer swirler is disposed on the upper end face of the inner layer plasma swirler. The filamentous arc discharge as one type of plasma discharge has huge advantages in the aspect of ignition and combustion supporting of a combustion chamber of an aero-engine, and the plasma exciter is combined with the head portion of the combustion chamber, so that ignition and combustion supporting can be integrated, and meanwhile active particles generated by plasma discharge are easily mixed with fuel oil molecules. The filamentous arc plasma exciter overcomes the defect that sliding arc plasmas cannot realize discharging when an inlet air flow rate is 0, improves combustion efficiency, is simple in structure and does not need to be equipped with a special air supply system or a special oil supply system.

The invention provides a gas compressor with a stability enhancing and effect improving device. The gas compressor comprises a casing, a wheel hub and the stability enhancing and effect improving device. A high-pressure gas suction hole, a gas ejecting hole and M gas jetting holes are formed in the casing. High-pressure gas is sucked into the stability enhancing and effect improving device through the high-pressure gas suction hole. Gas at the top of an intermediate-stage movable blade and gas at the root of an intermediate-stage static blade are sucked into the stability enhancing and effect improving device through the gas ejecting hole. The mixed gas is ejected to the top of a low-pressure-stage movable blade through the gas ejecting hole. By means of the gas compressor with the stability enhancing and effect improving device, the gas at the root of the intermediate-stage static blade and the gas at the top of the intermediate-stage movable blade can be sucked out, the thickness of a boundary layer of the area at the root of the intermediate-stage static blade and the vortex strength of an angle area can be reduced, flow separation of the areas is inhibited, the functions of reducing flowing losses and improving the efficiency of the gas compressor can be achieved, flowing blockage and gas backflow of the areas during instable work of the gas compressor are relieved, and the function of enlarging the stable work range of the gas compressor can be achieved.

The invention discloses a multi-level blade centrifugal wheel which comprises a front cover plate, multiple groups of blades and a hub, wherein the multiple groups of blades comprise first-level blades, second-level blades and short blades; multiple blades of the first-level blades are arranged at the inner circumference on one surface of the hub according to same setting angles; multiple blades of the second-level blades are arranged at the outer circumference according to same setting angles; the first-level blades and the second-level blades are alternatively distributed step by step; and the multiple short blades are distributed among the second-level blades. The centrifugal wheel disclosed by the invention can effectively inhibit flow separation of a pump in a blade passage in operation deviating from design conditions, so that the flow uniformity is improved, and the purpose of reducing the vibration magnitude of the pump is achieved.

The invention discloses an asymmetric self-circulation processing case with slotting position of parabola distribution for a centrifugal compressor, relating to a processing case of a centrifugal compressor, and belonging to the technical field of impeller machineries. A self-circulation channel is formed by arranging a pumping and sucking ring slot, a reflow ring slot and a guide ring slot on the wall surface of a compressor volute casing, and the distance Sr from the front end face of the pumping and sucking ring slot to the front edge of a main stream blade of a compressor impeller is in parabola distribution on the circumference direction to optimize the stability enhancing effect of the asymmetric self-circulation processing case on the centrifugal compressor. By adopting the asymmetric self-circulation processing case with the slotting position of parabola distribution for the centrifugal compressor, compared with the shaft symmetric self-circulation processing case with consistent slotting width on the circumference direction, the stable working range of the centrifugal compressor can be greatly improved while the efficiency is maintained unchangeable.

The invention relates to a surge-preventing structure for an aero-engine compressor. A stator ring is mounted inside a compressor case, uniformly and peripherally distributed stator vanes are arranged on the stator ring, a compressor rotor is positioned inside the compressor case 1 and is provided with rotor vanes, a radial vent hole is reserved between each two stator vanes and at the peripheral position of the stator vanes on the stator ring, and vent holes with the diameter larger than that of each radial vent hole are reserved at the corresponding positions on an intermediate case and the compressor case. Speed loss and surge due to overlarge attack angles are eliminated; and flow condition is improved, thereby surge can be prevented effectively. The surge-preventing structure has the advantages that compressor characteristics can be improved, stable working range can be widened, and the surge-preventing structure can be used for preventing 'front-surge and rear-vortex' type surges and is convenient to process, low in size required accuracy, simple, low in cost and reduced in gas loss.

The invention discloses a variable camber blade type tandem stator. A driving mechanism drives a first linkage ring and a second linkage ring to rotate, front blades of a front row of stators are driven to rotate and rear blades of a rear row of stators are driven to rotate to realize simultaneous adjustment of the installation angle of front blades of the front row of stators and rear blades of the rear row of stators to enable inlet airflow attach angle of the front row of stators to maintain in an appropriate range under different working conditions, the reduction of the flow separation isfacilitated, the occurrence of rotational stall or surge is avoided, and the stable working range of an air compressor is increased; and meanwhile, the requirements of a downstream rotor for the inletairflow angle are met, and the performance is improved. Through the driving structure, the simultaneous adjustment of different angles of the front blades of the front row of stators and the rear blades of the rear row of stators is achieved, the number of times of operation in the actual use process is reduced, and the operation efficiency is improved. The invention further provides the air compressor comprising the variable camber tandem stator.

The invention discloses a double-flow-guiding annular fan with a blade type air separator. An inner ring and an outer ring are added at the position of each blade tip of the fan, and separately have aflow guiding effect and a flow distributing effect. The center axis of each inner ring and the center axis of the corresponding outer ring are consistent to the center axis of the fan, and the innerrings are connected with the tops of blades so that the inner rings are fixed on the fan. The diameter and the width of each outer ring are greater than those of the corresponding inner ring, ring baffle plates with the same ring widths are separately arranged at two ends of each outer ring, and the ring width of each ring baffle plate equals to the difference between the radius of the corresponding inner ring and the radius of the corresponding outer ring. Each inner ring and the corresponding outer ring are connected with each other by a plurality of straight blades which are arranged in theperipheral directions of the rings and are distributed at equal intervals, the straight blades divide the inner rings and the outer rings to form air channels with the same sizes, and the air channels have rectification effect. By flow guiding, flow distributing and rectification, unsteady flow in the fan is relieved effectively, and the working stability of the fan is improved.

A surging-prevent compressor volute for a turbocharger adopts the structure that a tapered air inlet is formed in one end of the air intake passage of the compressor volute; an arc-shaped end matched with the outer contour of an arc-shaped blade of an impeller is arranged at the other end of the air intake passage; a circular flow guiding cavity is formed in the inner wall at the joint edge between the air intake passage and the arc-shaped end. During use, the impeller is mounted at the arc-shaped end of the compressor volute; the front edge end of the main blade of the impeller is arranged in the middle of the circular flow guiding cavity. When air disturbance is transmitted to an impeller inlet along the hub line of the impeller, and reaches the front edge of the main blade of the impeller, part of inlet air enters the flow guiding cavity in the form of a vortex after distorting circumferentially, so that a fluid field distorts to be transferred out of the impeller body, and the disturbance distortion of airflow at the impeller inlet is reduced, and is prevented from being further transmitted into the impeller; the airflow angle of inlet air at the impeller inlet is changed, so as to prevent distortion of the fluid field of the airflow at the air inlet end of a compressor, and enlarge the stable working range of the compressor.