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PIV粒子测速技术与其它测速技术相比,具有实时性和无干扰性的优点。本文以污水海洋排放系统内部海水入侵形成的复杂流动为例,将PIV测速技术应用于管道内部的非恒定密度分层流研究。海水入侵海洋扩散器将会大大降低污水处置效率,尤其是在早期建造的没有海水入侵防护装置的污水海洋处置工程中,这个问题显得尤为突出。本文在实验室里建造了一个简化的污水海洋排放系统模型,采用PIV粒子测速系统对排放管道内的流速场进行测量,在此基础上对排放管道海水入侵过程及其发展机制进行了分析。实验研究结果表明,排污流量是影响排放系统内部流动型式的主要因素,密度分层流交界面的卷吸和紊动掺混是排出入侵海水的主要动力,而且这两种动力在排出海水时所起的作用比重不同,主要取决于排污管道内的污水动量。
PIV particle velocity measurement technology compared with other velocimeters, with real-time and non-interference advantages. In this paper, taking the complex flow caused by seawater intrusion into the marine sewage discharge system as an example, PIV velocimetry is applied to the study of unsteady density stratified flow inside the pipeline. Intrusion of seawater into the marine diffuser will greatly reduce the efficiency of wastewater treatment, especially in the early stage of marine sewage disposal without seabed intrusion protection. In this paper, a simplified model of sewerage ocean discharge system was built in the laboratory. PIV particle velocity measurement system was used to measure the velocity field in the discharge pipe. On this basis, the process of seawater intrusion in the discharge pipe and its development mechanism were analyzed. The experimental results show that the discharge flow rate is the main factor affecting the internal flow pattern of the discharge system. The entrainment and turbulent blending of the delaminated flow interface are the main driving forces to invade the seawater, and the two kinds of driving force The role of the proportion of different, mainly depends on the sewage pipe sewage momentum.