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本文讨论雷诺数、佛洛德数、牛顿数在拖网模型试验中的意义。合成纤维网衣在水中重量与水动力相比可忽略不计,拖网及其模型均处于广义佛洛德数的自动模型区域内。实物网处于雷诺数的自动模型区域内,但其模型位于小雷诺数范围。换算阻力时需进行雷诺数修正。 现有田内、巴拉诺夫、迪克逊网渔具模型试验定律,可用于拖网模型试验,但也可用牛顿数安排试验。模型试验结果经雷诺数修正,并换算到实物网,与海上实测结果符合良好。 上述结论仅依据有限试验得出,尚需进一步验证。
This paper discusses the significance of Reynolds number, Freund number and Newton number in trawl model test. The weight of synthetic clothing in water is negligible compared to hydrodynamic forces, and the trawl and its models are all within the area of the automatic model of generalized Froude number. The physical mesh is in the auto-model area of the Reynolds number, but its model lies in the small Reynolds number range. Conversion resistance is required when the Reynolds number correction. Existing Tanaka, Baranov, Dixon fishing gear model test law, can be used for trawl model test, but can also be arranged in Newton’s test. The model test results were corrected by Reynolds number and converted to physical network, which is in good agreement with the measured data at sea. The above conclusion is based on a limited test only, further validation is needed.