Novel 90-degree variable-curvature bent pipe

Abstract

The invention provides a novel 90-degree variable-curvature bent pipe, belonging to the technical field of fluid engineering. The central arc line of the bent pipe is a variable-curvature arc line with a gradually increased curvature or a quarter elliptic type line, each cross section perpendicular to the central arc line is a circular cross section, the circular cross section is a circular surface the diameter (D) of which is equal to that of an inlet orifice and an outlet orifice of the bent pipe, two side of the inner wall of the bent pipe are symmetrically provided with ribs, the thickness of the ribs is 0.005D, the height is 0.05D, the molded lines of the ribs and the central line of the bent pipe are arranged in the same curved surface, and the distance from the two ends of the ribs to the inlet and outlet orifices are respectively the length of the diameter (D) of 0.33-0.36 orifices. The novel 90-degree variable-curvature bent pipe provided by the invention has a scientific and simple structure and reasonable design, can restrain dean vortex, reduce the resistance loss by 4-8% caused by the dean vortex and improve the hydraulic efficiency of the whole pipeline or mechanical equipment system.

Description

technical field [0001] The invention relates to an elbow for pipe turning and connection, in particular to the structure of the elbow which can improve the flow characteristics in the elbow, reduce the resistance loss of the elbow, and improve the flow state at the outlet of the elbow, and belongs to the technical field of fluid engineering. Background technique [0002] Elbows are widely used in industrial, agricultural, municipal and other equipment, such as hydraulic machinery, fluid machinery, oil and gas transportation, and pipeline systems for water supply and drainage. The usual curved pipes are arc curved pipes with equal curvature, and the secondary flow intensity inside them is relatively high, resulting in increased resistance loss. Secondary flow refers to a kind of regular accompanying motion produced when viscous fluid moves in a curve under a certain mainstream velocity and certain geometric boundary conditions. The fluid flows through the corner of the pipe ...

AI Technical Summary

Problems solved by technology

[0003] The existing 90° elbow is mainly an elbow with equal curvature radius, that is, the central arc of the elbow is a quarter arc, and there is a strong Dean vortex in the existing 90° elbow. Increase the diversion in the existing 90° elbow The plate can only improve the outlet section pressure and flow velocity distribution of the elbow, but will increase its resistance loss

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