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检测器在管道内依靠输送介质的压差产生动力,从而驱动其行走完成壁面腐蚀缺陷的扫描检测,检测器在管内的运动状态会直接影响到检测数据有效性。检测器速度一般采用泄流孔的方式控制,泄流孔的设计和检测器运动机理建模研究检测器运动状态的关键。本文采用流体力学的方法建立了检测器在管道中运动时的流场分析模型,分析了当原油以相对内检测器1.5 m/s流速通过不同结构泄流孔时的流场变化情况,结果表明单孔渐扩型泄流孔周围流场状态更加稳定,更有利于内检测器运动状态的稳定。建立了当内检测器采用单孔渐扩型泄流孔时的运动机理模型,对内检测器所受驱动力和摩擦阻力进行深入分析,得到了泄流孔开度和内检测器运动速度之间的特性关系曲线,为实现内检测器运动速度控制打下了理论基础。
Detector in the pipeline rely on the pressure difference of the transmission medium to generate power, which drives the completion of its scanning wall corrosion defects detection, detector in the tube movement will directly affect the validity of test data. The detector speed is generally controlled by the way of the drain hole. The design of the drain hole and the detector movement mechanism are the key points to study the detector’s movement state. In this paper, the flow field analysis model of the detector when it is moving in the pipeline is established by using the method of fluid mechanics. The flow field changes when the crude oil passes through the different structure of the discharge orifice with the relative inner detector velocity of 1.5 m / s are analyzed. The flow field around the discharge orifice with a single-hole gradually expanding shape is more stable, which is more conducive to the stability of the movement state of the inner detector. The motion mechanism model when the inner detector adopts a single hole expanding divergence hole is established, and the driving force and frictional resistance of the inner detector are deeply analyzed. The opening of the drain hole and the speed of the inner detector are obtained Between the characteristics of the curve, in order to achieve the detector speed control has laid a theoretical foundation.