Numerical Simulation Analysis of a Novel Discharge Speed-Regulation Device for Detector in the Pipeline

doi:10.16183/j.cnki.jsjtu.2024.225

Abstract

Abstract:

To address the issue of speed control of in-line detector in oil pipelines, a novel discharge speed-regulation device is proposed, which consists of a relief valve seat, a relief valve core, a spring, a guide rod, and other components. A mathematical model of the discharge speed-regulation device is established by analyzing the force acting on this device in a horizontal pipeline. The influence of the radians of the relief valve seat, the distance between the relief valve core and the back end of the detector, and the inlet fluid velocity on the motion state of the detector in the pipeline is studied using numerical simulation methods. The research results show that under the same boundary conditions, when the fluid passes through the detector, the differential pressure across the discharge speed-regulation device, the total head loss coefficient, and the turbulent kinetic energy of the flow field are inversely proportional to the left radian of the relief valve seat and directly proportional to the right radian. When the left radian of the relief valve seat is 60° and the right radian is 15°, all parameters reach their minimum values. An increase in the inlet fluid velocity will lead to higher pressure differences between the front and back ends of the discharge speed-regulation device, and more turbulent kinetic energy in the flow field. When the radians of the relief valve seat holds constant and the inlet fluid velocity increases from 0.6 m/s to 2 m/s, the differential pressure increases by 106 290 Pa and the turbulent kinetic energy increases by 1.831 m²/s². The distance between the relief valve core and the back end of the detector is inversely proportional to the pressure difference between the front and back ends of the discharge speed regulation device and the speed of the detector. When the distance between the valve core and the back end of the detector increases from 15 mm to 35 mm, the pressure difference between the front and back ends of the discharge speed regulation device decreases by 240 Pa. This paper provides an important theoretical basis and practical guidance for optimizing the operational performance of in-line detectors in oil pipelines and improving detection efficiency.

Key words: oil pipeline, internal detector, discharge speed regulation device, differential pressure, speed control

CLC Number:

TE973.6

TANG Jian, YU Wenxiu, ZHANG Qiuping, JIAO Xiangdong, DING Xuepeng. Numerical Simulation Analysis of a Novel Discharge Speed-Regulation Device for Detector in the Pipeline[J]. Journal of Shanghai Jiao Tong University, 2026, 60(2): 319-330.

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参数	取值
d/mm	0.8
D_m/mm	9
D₁/mm	8.2
D₂/mm	9.8
H₀/mm	58
P_j/N	14.56
f_j/mm	2.97
k/(N·mm^-1)	0.62
F_j/mm	26.73

网格编号	网格单元尺寸/mm	网格数量×10^-6	流场平均速度/ (m·s^-1)
1	10	0.636 2	0.748
2	8	0.799 8	0.667
3	6	1.128 2	0.554
4	4	2.036 5	0.458
5	3	3.336 9	0.427
6	2	7.441 0	0.416

泄流阀芯-检测器后端的距离/mm	Δp/Pa	S/m²	F/N
15	7 490	0.004 28	32.057
20	7 460	0.004 28	31.929
25	7 420	0.004 28	31.758
30	7 380	0.004 28	31.587
35	7 350	0.004 28	31.458