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摘要
In this paper, the numerical simulation method is used to study the flow resistance law of u-shaped channels under rotating conditions based on similarity theory. The study compares three geometric models: real model,completely similar model and incompletely similar model for cooling typical U-shaped channels inside turbine rotating blades. The completely similar model is geometrically 4.8 times magnification of the real model, and the rotation radius ratio of the real model is 5.4 times that of the incomplete similar model. It is found that the friction factor of the completely similar model increases with the rotation number, and the difference varies from 6 % to 38 %. The friction factor of the model after incomplete similarity amplification decreases with the increase of rotation number, and the difference varies from-2% to-30%. The friction factor of the laboratory imperfectly similar amplification model combined the effects of the above two laws, and the predicted difference was within 12%. This study provides a theoretical basis for subsequent experiments related to flow resistance.
