Tangential turbine runner

Abstract

The invention discloses a tangential turbine runner comprising a runner shaft and bucket blades which are uniformly arranged on the circumference of the runner shaft. The quantity of the bucket blades is obtained by the formula that the radial length L of each bucket blade is equal to (2.2-2.5)d0 and is reduced by 10%-15% compared with the radial length of the regular bucket blade; the width B of each bucket blade is equal to (2.8-3.2)d0 and is increased by 9%-11% compared with the width of the regular bucket blade; the depth T of each bucket blade is equal to (0.95-1.15)d0 and is increased by 4%-6% compared with the depth of the regular bucket blade; and the root thickness X of each bucket blade is equal to (0.5-0.8)B. According to the tangential turbine runner disclosed by the invention, parameters of the radial length, the width and the depth of each blade bucket are changed, the root thickness of each bucket blade is increased, and the quantity of the bucket blades is calculated according to the researched bucket blade quantity determining formula, so that the nozzle quantity, the jet flow and the flowing inside the runner do not interfere with one another, and reflowing does not exist in the root part region of each bucket blade. The hydraulic loss is greatly reduced and the output power of a set is greatly improved; and the model hydraulic efficiency of the tangential turbine runner with the bucket blade structure is detected to reach 91.66%, which the highest efficiency value of the current same-type runners at home and abroad.

Description

technical field [0001] The invention uses the field of water conservancy and hydroelectric machinery design and manufacture, in particular belongs to the field of design and manufacture of impact water turbines, and in particular relates to the design and manufacture of impact water turbine runners in impact water turbines. Background technique [0002] Among the impact turbines, the impact turbine has the advantages of simple structure, high water head, installation elevation not limited by cavitation conditions, and insensitivity to flow changes. It has a wide range of applications, and its stand-alone output and water head are constantly increasing. [0003] In recent years, the efficiency and output of the new cutting hammer turbine have been continuously improved, and the applied water head has also increased greatly, and the working stress at the root of the water bucket has increased significantly, reducing its safety factor. Compared with the runner of the impact tu...

AI Technical Summary

Problems solved by technology

Cavitation causes vibration and noise, forcing frequent overhaul of the unit, which greatly reduces the efficiency and output of the runner; fatigue cracks often appear at the root of the bucket blade of the runner. In order to make up for the insufficient strength of the bucket root, new design technologies, materials and processes are constantly Applied to the design and manufacture of impact runners, how to accurately predict the stress distribution of the runner and optimize the shape of the runner bucket root in consideration of the strength requirements of the runner bucket blade root under the premise of ensuring the runner performance index line and structure, establish an accurate three-dimensional model of the runner, and make the water bucket fully achieve the purpose of CNC machining, which has become an urgent problem to be solved in the design and manufacture of the current shear turbine runner

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