6results about How to "Reduce leakage flow" patented technology

The utility model discloses a ducted fan, which belongs to the technical field of aviation ducted fan engines, and comprises an annular duct, a plurality of blades and a plurality of blades, the fan blades are arranged in the annular duct, blade tip arc surfaces are arranged at the blade tips of the fan blades, and blowing gaps are formed in the sides, close to the suction surfaces, of the fan blades; the fan blades are fixedly connected to the outer side of the fan shaft; the driving part is used for driving the fan shaft to rotate, and the driving part is arranged on the rear side of the annular duct; the ratio of the height of the air blowing seam to the diameter of the arc surface of the blade tip is set to be 0.01-0.05; an air flow channel is formed in the fan blade and communicates with the air blowing seam. The number of the fan blades is two or more. The interior of the fan shaft is of a hollow structure. According to the utility model, the blade top clearance leakage flow is reduced by blowing at the top ends of the blades, so that the propulsion efficiency of the ducted fan is improved.

This invention belongs to the field of radial turbines, specifically relating to a leakage prevention structure and a radial turbine. One leakage prevention structure includes a first inlet pipe, a first outlet pipe, and a second outlet pipe; the outlet of the first inlet pipe is connected to the inlet of the first outlet pipe and the inlet of the second outlet pipe, respectively; the leakage prevention structure is installed at the tip of the moving blade, allowing pressure-side fluid to enter the first inlet pipe, fluid ejected from the first outlet pipe to act within the gap, and fluid ejected from the second outlet pipe to act on the suction side. The leakage prevention structure of this invention can introduce pressure-side fluid into the gap and suction side, thereby reducing blade load; on the other hand, the fluid flowing into the gap significantly increases the leakage flow resistance, reducing the leakage flow rate; the fluid flowing into the suction side impacts the leakage vortex, weakening the leakage vortex intensity and further reducing the leakage flow rate; thus, it has the effect of weakening the leakage vortex intensity, reducing losses, and improving turbine efficiency.

A rotating machine is provided with: a rotating unit; a stationary part surrounding the rotating part; and a sealing device for reducing a leakage flow of a fluid passing through a gap between the rotating part and the stationary part, the sealing device comprising: a sealing member provided in the gap between the rotating part and the stationary part; and a first urging member that urges the seal member toward the outside in the radial direction of the rotating machine, the inner peripheral surface of the stationary portion being formed with: a first groove that extends in the circumferential direction of the rotating machine; and a second groove which is located upstream of the first groove in the axial direction of the rotating machine and extends in the circumferential direction, in which a first support part capable of supporting the seal member is formed on the side surface of the first groove, and a second support part capable of supporting the seal member is formed on the side surface of the second groove.

The invention relates to a display panel and a display device, and relates to the technical field of display, the display panel comprises a plurality of sub-pixels and a pixel circuit electrically connected with the sub-pixels, and the pixel circuit comprises a driving transistor, a first transistor and a second transistor; the brightness sensitivity of the first color sub-pixels is greater than that of the second color sub-pixels; the width-to-length ratio of the channel region of the first transistor corresponding to the first color sub-pixel is N1, and the width-to-length ratio of the channel region of the first transistor corresponding to the second color sub-pixel is N2, N1lt; n2; and / or, the width-to-length ratio of the channel region of the second transistor corresponding to the first color sub-pixel is M1, and the width-to-length ratio of the channel region of the second transistor corresponding to the second color sub-pixel is M2, M1lt; and M2, the brightness of the sub-pixels with different brightness sensitivities can be regulated to be approximately the same, and screen body flicker is reduced.

The invention belongs to the technical field of ship power equipment, and relates to a direct reversing turbine with a double-layer blade self-adaptive separation flow control structure, which comprises an ahead-stage turbine, a reversing-stage turbine, a plurality of ahead-stage turbine blades and a plurality of reversing-stage turbine blades, and a suppression structure is arranged on each reversing-stage turbine blade. The restraining structure comprises a plurality of bent pipes, a plurality of bent pipe air inlet holes, a plurality of bent pipe air outlet holes and lines. The dimples are formed in the suction surface of the reversing-stage turbine blade in the radial direction and are close to the grains; the dimples are arranged in the radial direction. High-pressure airflow on the top end face of the reversing stage turbine blade can be guided, so that the high-pressure airflow enters from each bent pipe air inlet hole and flows out from the corresponding bent pipe air outlet hole, part of separated flow on the suction surface of the reversing stage turbine blade is taken away, and the breaking and transition processes of vortexes are promoted in cooperation with the grains and the multiple dimples; and separation flow of the suction surface of the reversing-stage turbine blade is inhibited.

This invention provides a turbine blade and a gas turbine. The turbine blade includes a blade body. The blade body includes a suction surface, a pressure surface, a suction side rib, and a pressure side rib; the suction side rib is disposed on the suction surface at the tip of the turbine blade, and the pressure side rib is disposed on the pressure surface at the tip of the turbine blade, forming a tip groove; the turbine blade also includes an outer blade tip surface disposed at the tip of the turbine blade; the bottom edge of the suction side rib and the tip edge of the suction surface are connected through the outer blade tip surface, and the bottom edge of the pressure side rib and the tip edge of the pressure surface are connected through the outer blade tip surface; the suction side rib is inclined from the outer blade tip surface to the suction surface, forming a first angle with the outer blade tip surface, and a suction side groove is formed between the outer surface of the suction side rib and the tip surface; the pressure side rib is inclined from the outer blade tip surface to the pressure surface, forming a second angle with the outer blade tip surface, and a pressure side groove is formed between the outer surface of the pressure side rib and the tip surface. The above-described turbine blade can reduce tip leakage flow.