6results about How to "Improve wall effect" patented technology

The invention relates to the technical field of gas turbine hot end cooling, and discloses a flat cat ear air film hole cooling structure applied to a gas turbine and a construction method.The flat cat ear air film hole cooling structure comprises a solid wall, the solid wall is provided with an outer wall face and an inner wall face, and the outer wall face is used for making contact with a high-temperature mainstream; each air film hole comprises an elliptic cylinder section arranged on the solid wall and an expansion section communicated and coaxial with the elliptic cylinder section, the joint of the elliptic cylinder section and the expansion section is an inlet molded line, a cold air inlet is formed in the inner wall face of the end, away from the expansion section, of the elliptic cylinder section, and a cold air outlet is formed in the outer wall face of the end, away from the elliptic cylinder section, of the expansion section. An ideal anti-kidney-vortex structure can be formed, cold air is promoted to expand in the transverse direction, the spanwise coverage area of an air film is increased, and the wall attachment effect of the air film is improved, so that the cooling efficiency of the air film is improved, meanwhile, uniform seam-shaped outflow can be formed, and the pneumatic loss caused by mixing of the cold air and main flow is reduced.

This invention belongs to the field of engineering machinery technology and relates to a construction method for a variable-diameter drilling and reaming integrated pile driver. It solves the problem that existing drilling and reaming integrated pile drivers cannot change diameter. The construction method is based on a variable-diameter drilling and reaming integrated pile driver, which includes an active pipe, a driven pipe, an upper wing plate seat, a lower wing plate seat, and a reaming arm. The reaming arm is formed by connecting an upper wing plate and a lower wing plate. The upper wing plate is formed by connecting an upper wing plate and an upper wing plate link, and the lower wing plate is formed by connecting a lower wing plate and a lower wing plate link. The construction method determines the length of the reaming arm to be connected by adjusting the position of the upper wing plate seat on the gear key and the position of the lower wing plate seat on the driven pipe. Then, it adaptively adjusts the number of wing plate link connections. Through the coordinated cooperation between the components, it achieves reaming operations for different pile diameters, angles, and sizes, which is simple, convenient, and greatly improves construction efficiency.

The invention belongs to the technical field of diaphragm wall construction, and particularly relates to a water-rich round gravel stratum diaphragm wall construction cement paste composition, a preparation method and application. The cement paste composition per cubic meter comprises the following raw materials in parts by weight: 170-200 parts of bentonite, 8-15 parts of sodium carbonate, 4-8 parts of CMC, 1-2.5 parts of caustic calcined magnesite, 1-2 parts of an adhesive and 900-1000 parts of water. The cement paste composition further comprises sawdust, and the sawdust accounts for 4-8% of the cement paste composition in percentage by weight. Slurry for underground diaphragm wall construction is compounded, and on the basis of the base material bentonite, sodium carbonate, CMC, caustic calcined magnesite and an adhesive aid which are used for improving the overall viscosity of the slurry composition are added, so that the viscosity, specific gravity and stability of the slurry are further improved, and the wall protection effect is improved. On the basis of the compound composition, 4-6% by weight of sawdust is further added, the sawdust is circularly suspended and distributed in the slurry through the slurry, and the sawdust is taken away and filled in gaps of groove walls when the slurry is diffused and lost, so that the loss of the slurry is blocked.

The invention provides a flat seam-shaped air film hole cooling structure applied to a hot end component of a gas turbine, and relates to the technical field of heat transfer and cooling of the hot end component of the gas turbine, the flat seam-shaped air film hole cooling structure comprises an air film hole, the air film hole is composed of a special-shaped section which expands in the spanwise direction and contracts in the flow direction or slightly expands, and the special-shaped section is a ruled surface composed of an inlet molded line and an outlet molded line. The inlet molded line is in an oval shape, the oval shape comprises a long axis a and a short axis b, the outlet molded line is in a rectangular shape, and a rounding structure is arranged on the outlet molded line; improvement is carried out based on a traditional flat seam-shaped hole, the development of kidney-shaped vortexes in the hole is inhibited by increasing the spanwise width of the inlet, kidney-shaped vortex pairs near the center line of the traditional flat seam-shaped hole can be effectively eliminated, the wall attachment effect of an air film near the downstream center line of a wake is improved, and therefore the cooling efficiency of the air film near the center line is improved; and meanwhile, the temperature uniformity in the spanwise direction is improved, and the wall surface temperature gradient is reduced, so that thermal stress is reduced.

The present application relates to a kind of new type of wall protection mud material for ultra-deep underground continuous wall and its preparation method, comprising the following steps: pour mixing water into the first container, while adding bentonite, the first container is stirred to be uniformly dispersed;Sodium carbonate, sodium carboxymethyl cellulose, xanthan gum and silicone acrylic emulsion are mixed and added to mixing water and poured into the second container, and stirred to be fully hydrated;Mix the solution in the first container and the second container, stir to be fully mixed, complete mud preparation.The beneficial effects of the present application are: it can avoid the hidden troubles such as excessive lateral earth pressure, large amount of mud loss, thin and dense mud skin cannot be formed when the excavation depth of underground continuous wall is large, configure a new type of modified bentonite wall protection mud with suitable physical stability and chemical stability, appropriate relative density, good mud skin forming property, which can adapt to the working condition of ultra-deep underground continuous wall, avoid the occurrence of hole collapse and shrinkage phenomenon, so as to ensure the quality of slotting and construction safety.

The invention discloses a slurry system suitable for complex rock stratum drilling and a preparation method and application thereof, the slurry system is composed of bentonite slurry and rock slag, and 23-41 g of rock slag is added into every 100 mL of bentonite slurry; the bentonite slurry is prepared from the following raw materials in parts by weight: 1 to 8 parts of bentonite, 0.03 to 0.32 part of sodium carbonate, 0.1 to 1 part of filtrate reducer, 0.1 to 0.5 part of coating inhibitor, 0.10 to 0.15 part of viscosity reducer and 100 parts of water. The raw material components are uniformly mixed and stirred, and an alkali solution is added to adjust the pH value to be neutral or alkalescent, so that the slurry system suitable for complex rock stratum drilling can be prepared. The slurry system can be used for preparing drilling fluid for complex rock stratum drilling in the Ordos region and the like. The problems that in the existing complex rock stratum drilling process, the rock slag amount is large, the inferior solid phase invasion concentration in mud is high, and the rheological property, the filter loss and the mud cake quality are difficult to control can be solved.