【摘要】 为解决高温高黏度暂堵剂生产中液滴断裂时间过长和液滴长径比过大的问题，采用理论计算得到暂堵剂液滴成型的最小速度为0.203 9 m/s,并推导出其最优扰动周期的计算公式，通过数值模拟方法分析暂堵剂液滴成型过程，探究在无扰动和外加方波扰动作用下的液滴成型流场的变化情况。模拟结果表明：无扰动时的射流在300 mm内难以断裂形成液滴，射流温度在0.5 s内基本不变，射流速度增长到初始速度的2.13倍；在外加方波扰动时，扰动周期过短不利于液滴均匀成型，扰动周期过长会导致液柱在断裂前过度拉长，在扰动周期为0.11 s左右时液滴成型效率最高，其断裂频率稳定在0.11 s,最终液滴长径比稳定在2左右。研究结果为高黏度暂堵剂液滴成型的工艺参数选取提供一定依据。更多还原

【Abstract】 In order to solve the problems of excessively long droplet break time and excessively large droplet length to diameter ratio in the production of high-temperature and high-viscosity temporary plugging agent, the minimum velocity of droplet forming of temporary plugging agent was obtained by theoretical calculation, and the formula for calculating the optimal disturbance period was derived. The numerical simulation method was used to analyze the droplet forming process of temporary plugging agent, and the changes of the flow field of the droplet forming under the action of no disturbance and external square wave disturbance were explored. The simulation results show that without disturbance, the jet is difficult to break into droplets within 300 mm, the jet temperature is basically unchanged within 0.5 s, and the jet velocity increases to 2.13 times of the initial velocity. When square wave disturbance is added to the outside, too short disturbance period is not conducive to uniform droplet forming, and too long disturbance period will lead to excessive elongation of liquid column before fracture. When the disturbance period is about 0.11 s, the droplet forming efficiency is the highest, the fracture frequency is stable at 0.11 s, and the final droplet length-diameter ratio is stable at about 2. The research results provide a basis for the selection of process parameters for droplet forming of high viscosity temporary plugging agent.更多还原