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模型相似律是水工模型与原型之间的换算准则,前人对水流脉动压力相似律已做了大量的研究,但是对脉动压力频谱的相似准则至今仍没有达成共识.本文将水跃作为研究对象,对1:1,1:2和1:5系列模型上测试所得的脉动压力频谱的主频和优势频段等进行了比较.结果表明,水跃强旋滚区脉动压力频谱符合重力相似律;跃首跃尾脉动压力频谱主频和优势频段都很低,不同比尺的脉动压力频谱较相近,常被误认为λf=1,但优势频段和频谱图归一化分析表明,跃首跃尾脉动压力优势频段也基本符合重力相似律.
Model Similarity Law is the conversion rule between hydraulic model and prototype, and many researches have been done on the similarity law of pressure pulsating pressure, but so far no agreement has been reached on the similarity criterion of pulsating pressure spectrum.Taking water jump as research The main frequency and dominant frequency band of the pulsating pressure spectrum measured on the 1: 1, 1: 2 and 1: 5 series models are compared.The results show that the pulsating pressure spectrum of the strong hydro-roll region accords with the law of gravity similarity The dominant frequencies and dominant bands of the pressure spectrum are very low, and the pulsating pressure spectra of different scales are similar and often mistaken for λf = 1. However, the normalized analysis of the dominant bands and spectra shows that the dominant vocalization The caudal pulsating pressure dominant frequency band also basically accords with the gravity similar law.