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准确划分射流集束段和雾化段是研究射流集束性的前提。设计了一种基于光强定量测量集束性的方法。基于该方法对具有尖锐边缘孔口和类流线型出口流道的喷嘴,在超高压喷射条件下形成的水射流结构形态进行分析,并与直柱型出口流道喷嘴射流对比分析。结果表明:光强测量法能够比较准确地划分射流集束段和雾化段,区分雾化段中核心区和气液混合区;毛细超高压水射流的集束性在雷诺数影响下由喷嘴孔口结构、出口流道结构的综合作用决定;在一定雷诺数范围内,具有尖锐边缘孔口和类流线型出口流道的喷嘴有良好的集束性,当雷诺数达到1.8×104~1.9×104时,射流集束段长度趋于恒定;喷嘴出口流道结构通过气流调节,对射流集束性的影响在高雷诺数下可以忽略,空气动力扰动在高雷诺数下对射流集束性影响程度显著降低。
Accurately demarcating the jet cluster section and the atomization section is the premise of studying jet convergence. A method based on quantitative measurement of light intensity was designed. Based on this method, the shape of water jet formed under the condition of ultra-high pressure jet was analyzed and compared with the nozzle jet of straight outlet flow channel. The results show that the light intensity measurement method can accurately classify the jet cluster section and the atomization section and distinguish the core region and the gas-liquid mixing region in the atomization section. The convergence of the capillary ultrahigh pressure water jet is influenced by the Reynolds number, , Outlet flow channel structure of the comprehensive effect of decision; within a certain range of Reynolds number, with sharp edge orifice and streamlined outlet flow nozzle has good convergence of the nozzle, when the Reynolds number reached 1.8 × 104 ~ 1.9 × 104, the jet The length of the convergent section tends to be constant. The influence of jet outlet flow channel structure on the jet convergence can be neglected at high Reynolds number, and the influence of aerodynamic perturbation on jet convergence is significantly reduced under high Reynolds number.