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针对高流速天然气管道内常规检测设备无法使用的问题,提出了开泄流孔主动调控设备运行速度的方法,建立了基于泄流孔调速的模型,并推导出泄流公式。但公式中泄流孔局部阻力因数的取值较困难,导致应用不便。根据检测设备泄流孔的特点和流体力学孔口出流方面的理论,建立了基于薄壁孔口出流的管道检测设备泄流模型,推导出薄壁孔口出流公式,在介质输送满足雷诺数不低于105的条件下,且泄流孔尺寸较小时,泄流孔局部阻力因数为0.06。根据新建泄流模型对固定泄流面积的检测器和速度控制清管器的运行速度进行了预测,其计算结果与现场运行情况一致,新建泄流模型参数较少、结构简单,方便工程现场计算。
Aiming at the problem that conventional testing equipment in high flow rate natural gas pipeline can not be used, a method to control the operation speed of the spill hole is proposed. The model based on the spout speed regulation is established and the discharge formula is deduced. However, the formula in the drainage hole local resistance factor more difficult to value, leading to inconvenience. According to the characteristics of the discharge hole of the testing equipment and the theory of the outflow of the fluid mechanics orifice, the discharge model of the pipeline inspection equipment based on the thin-walled orifice outflow is established, and the outlet formula of the thin-walled orifice is derived. When the medium delivery satisfies Reynolds number of not less than 105 conditions, and the smaller size of the drain hole, drain local resistance factor of 0.06. According to the new discharge model, the running speed of the detector with fixed bleed area and the speed controlled pig are predicted. The calculated results are consistent with the field operation. The parameters of the new discharge model are less, the structure is simple, .