Aerator performance prediction method based on dimensional analysis

Abstract

The present invention belongs to the field of fluid and environmental protection equipment, and proposes a method for obtaining an aeration performance relationship between a scale aerator prototype and an original aerator according to the dimensional analysis. The method comprises: obtaining the specific size of an aeration area pool of the actual aerator through measurement; scaling the aeration pool and the aerator according to the proportion; producing the aeration pool and the aerator prototype; carrying out experiments to measure aeration performance of the aerator prototype at different rotational speeds; drawing curves of the number of absorption with the number of Froude (Y-Fr) and of the number of dynamic efficiency with the number of Froude (SAE*-Fr); according to the actual running condition of the original aerator, calculating the number of Froude of the original aerator in actual running; and finally, by comparison with the Y-Fr curve and the SAE*-Fr curve of the prototype, carrying out conversion to obtain the aeration performance indicators, namely the standard oxygenation capacity SOTR and the standard power efficiency SAE of the original machine. By virtue of the method provided by the present invention, not only aeration performance parameters of the aerator in actual running can be quickly and accurately measured, but also aeration performance of the aerator when the rotational speed changes can be predicted.

Description

technical field [0001] The invention belongs to the field of fluid and environmental protection equipment, and relates to a method for measuring the aeration performance of an aerator, in particular to a method for measuring the aeration performance of an aerator based on dimensional analysis. Background technique [0002] Sewage treatment is the process of purifying sewage to make it meet the water quality requirements of a certain water body or reuse. The aerator is a new type of sewage treatment equipment, which throws the sewage into the air at high speed through the rotating impeller partially immersed in the liquid surface to make it Form a hydraulic jump in contact with the air in a large area to enclose the air, and at the same time make the liquid in the pool do a circular and up-and-down composite flow, and then perform aeration, oxygenation and mixing of the surrounding water body, which can be obtained in various forms of aeration tanks. widely used. [0003] Th...

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a simple, efficient, and accurately determine the aeration performance of the scale prototype and the prototype surface aerator under different pool types, different liquid levels, and different speeds through dimensional analysis. Relational method to solve the problem of increased factory test cost caused by prototype testing

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