Three-dimensional modeling method for runner blade of tubular water turbine

Abstract

The invention discloses a three-dimensional modeling method for a runner blade of a tubular water turbine. The method is implemented by the two steps of 1, generating a blade profile curve usable forthree-dimensional software; and 2, generating a three-dimensional entity blade by utilizing the curve. Two-dimensional AutoCAD software is adopted for importing a blade profile of a wooden pattern toPro / E to generate a blade section curve; used commands include a from-reference command, a sketching command, a sketch plane selection command, a sketch-from-file command and a completion command; AutoCAD and Pro / E interfaces with good performance are adopted; and coordinates of points do not need to be calculated but are suitable for a Cartesian coordinate system. A blade body is generated by adopting point, line, surface and body methods, then the blade body is subjected to shape modification, and finally a three-dimensional model of the blade is realized; and the runner blade of the tubularwater turbine is subjected to accurate three-dimensional modeling, thereby facilitating numerical control machining, hydromechanics calculation analysis and performance prediction.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics calculation analysis and performance prediction, and in particular relates to a three-dimensional modeling method for runner blades of a tubular water turbine. Background technique [0002] The runner blade of the tubular turbine is the core component of the tubular turbine, which realizes the conversion of energy and converts the energy of the water flow into the dynamic potential energy of the rotating machine. Its performance directly affects the overall efficiency of the tubular turbine unit; The blade is an important part of the runner. The blade of the tubular turbine runner has a sculptured curved front, a back, a curved surface with variable arc radius at the water inlet, a curved surface at the water outlet, a hub spherical surface, and a rim cylindrical surface; the three-dimensional structure of the blade It is a complex and distorted curved body. The previous design methods of ...

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Problems solved by technology

[0002] The runner blade of the tubular turbine is the core component of the tubular turbine, which realizes the conversion of energy and converts the energy of the water flow into the dynamic potential energy of the rotating machine. Its performance directly affects the overall efficiency of the tubular turbine unit; The blade is an important part of the runner. The blade of the tubular turbine runner has a sculptured curved front, a back, a curved surface with variable arc radius at the water inlet, a curved surface at the water outlet, a hub spherical surface, and a rim cylindrical surface; the three-dimensional structure of the blade It is a complex and distorted surface body. The previous design methods of cross-flow runner blades mostly rely on experience and imitation design, which cannot meet the actual requirements; and the traditional optimization design of cross-flow runner blades only pays attention to the impact of geometric parameters on the hydraulic power of the runner blades. The influence of performance, the strength performance is used as the check after the hydraulic performance is satisfied. This method will cause the design work to be repeated back and forth and prolong the optimization design cycle.

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