Analysis on flow field and shape structure of circular nozzle water jet

doi:10.16265/j.cnki.issn1003-3033.2021.10.012

Abstract

Abstract: In order to improve and optimize application of circular nozzle water jet technology in coal mines, based on theory of jet structure and velocity distribution of circular nozzle, flow field and morphological structure characteristics of the water jet were analyzed by using COMSOL numerical simulation software and high-speed camera technology. The results show that its structure can be divided into initial segment, transition segment, basic segment and dissipation segment, and the jet flow has diffusivity. Distribution of its axial velocity features piecewise function, and this velocity is a function of outlet pressure and distance from jet head to nozzle, while velocity distribution at jet section features self-mode, and that at each section can be regarded as a Gaussian distribution. At the beginning of cutting and erosion of coal and rock mass by water jet, there is about 400 ms of impact lag, main structure will be formed between 400 and 800 ms, and overall structure tends to be stable after 800 ms.

Key words: circular nozzle, water jet flow field, morphological structure, jet structure, half width, core area

CLC Number:

X924.2

GAO Yabin, GUO Xiaoya, XIANG Xin, HAN Peizhuang, TANG Yibo. Analysis on flow field and shape structure of circular nozzle water jet[J]. China Safety Science Journal, 2021, 31(10): 82-88.

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