含水率对油水乳化液传输频率特性影响分析
Analysis to the Influence of Water Content on the Frequency Characteristics of Oil-Water Emulsion Transmission

为了掌握油水乳化液中含水率对其动态特性的影响，建立含水率与乳化液传输的频率特性之间的非线性关系。首先,推导了油水乳化液在管体中压力波传播速度公式，分析了含水率对乳化液传输速度的影响规律;然后,利用分布参数理论以及传递矩阵法建立了油水乳化液的传输频率模型，表明在PVC透明钢丝软管中考虑流固耦合作用时含水率增加，其传播速度呈降低趋势；反之，钢管内乳化液的传输速度随着含水率的增加而呈递增趋势；含水率对系统的谐振频率影响也较为明显，乳化液中含水率越大，系统的同阶谐振频率越低，且随着含水率的增加，谐振频率的阶次越大，同阶次的谐振频率之间的差值也相应变大。实验验证所建模型是有效的，为有效检测油中含水率以及保障系统安全运行提供一定的理论基础。
In order to understand the influence of water content on the dynamic characteristics of oil-water emulsion, firstly the pressure wave velocity formula of the oil-water emulsion in the pipe is deduced in the body to establish the nonlinear relationship between water content and the frequency characteristics of emulsion transmission, and to analyze the law of effect of water content on the emulsion transmission speed. Then the parameters of distribution theory and transfer matrix method are used to develop the transmission frequency model of water in oil emulsions. The results show that oil-water emulsion propagation speed decreases with the increase of water content, considering fluid solid coupling effect of PVC transparent steel wire hose; on the contrary, with water content increasing, the transmission speed of emulsion is increasing trend in steel pipe. It′s obvious that the influence of water content on resonant frequency of the oil-water emulsion transmission system, is higher with water content rate in emulsion, and the same order of the resonant frequency of the system is lower. Further, with the resonant frequency of the order is greater under the increase of water content, the difference is corresponding bigger than the same order of the resonant frequency. The effectiveness of the model is validated by the experiments, to provide theoretical basis for water content detection in oil and guarantee the safe operation of the system