非淹没双空化射流流场及冲击特性数值模拟

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 31-38.

论文

非淹没双空化射流流场及冲击特性数值模拟

李登1,2，姚致远1,2，涂翊翔1,2，刘勇3，巫世晶1,2，王晓笋1,2

作者信息 +

Numerical simulation of the flow field and impact characteristics of a non-submerged dual cavitating waterjet

LI Deng1,2，YAO Zhiyuan1,2，TU Yixiang1,2，LIU Yong3，WU Shijing1,2，WANG Xiaosun1,2

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文章历史 +

摘要

空化射流具有比同等条件下普通水射流更强的冲击力，被广泛应用于各种领域。为进一步提高空化射流的工作效率，提出了新型的非淹没双空化射流。基于多相流Mixture模型和RNG k-ε输运方程，研究了双空化喷嘴中内外喷嘴径向间距D0与出口轴向间距L，以及外喷嘴来流压力P1对射流轴线速度、压力、含气率与比能的影响，并分析了最优D0、L、P1组合下射流冲击平板的壁面压力分布特征。研究结果表明：当D0=1.5mm，且L=2mm时射流的流场特性最优，在此结构下的最优靶距为20-25mm。对该非淹没双空化射流冲击特性分析发现，相比于传统中心体空化喷嘴，其可产生体积更大的空化云和更好的冲击效果。研究结果可为空化射流的高效应用提供理论基础。

Abstract

Compared with plain waterjet, cavitating water jet can produce stronger impact forces and is thus being applied in all kinds of applications. Aiming at further improving the efficiency, a new type of cavitating waterjet called non-submerged dual cavitating waterjet is proposed. By using the Mixture model of multiphase flow and the RNG k-ε transport equation, the effects of outer nozzle width D0, outer nozzle extension length L and outer nozzle pressure P1 on the velocity, pressure, and vapor content are analyzed, as well as the impact characteristics under the optimal combination of D0、L、P1. The results show that the optimal flow field appears when D0 = 1.5mm and L = 2mm, and the optimal standoff distance under this condition is 20-25mm. Through analyzing the impact characteristics, it can be found that the non-submerged dual cavitating waterjet produces a larger volume of cavitation cloud and better impact effect, compared with the traditional central body cavitation nozzle. The results could provide a theoretical basis for the high efficient application of cavitating waterjet.

导出引用

李登1,2，姚致远1,2，涂翊翔1,2，刘勇3，巫世晶1,2，王晓笋1,2. 非淹没双空化射流流场及冲击特性数值模拟[J]. 振动与冲击, 2023, 42(6): 31-38

LI Deng1,2，YAO Zhiyuan1,2，TU Yixiang1,2，LIU Yong3，WU Shijing1,2，WANG Xiaosun1,2. Numerical simulation of the flow field and impact characteristics of a non-submerged dual cavitating waterjet[J]. Journal of Vibration and Shock, 2023, 42(6): 31-38

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