Numeration Research Of Detector Within The Gas Pipeline Under Drainage Station

Detectors within the gas pipeline make use of several modern detection technologies including Magnetic Flux Leakage (MFL), Electro-Magnetic Acoustic Transducer (EMAT) and Ultrasonic Testing (UT).Identify the defects information. Detectors depend on the pressure of natural gas to transmit in the pipeline. In order to improve the accuracy of the detector measurement, it is necessary to control the detector velocity within a reasonable limitation.The problem of detector speed control within the gas pipeline has been contraposed. The flow simulation of the detector within the gas pipeline under drainage station has been researched. Base on the domestic and international related documents, velocity control law of on-line detector within gas pipeline has been researched, with the actual Magnetic Flux Leakage mechanical design of detector to build simulation models. Especially, focus on the establishment of a model under drainage station. Seek to rationality of establishing a simulation model.The paper base on the detector operating theory in the gas pipeline, combining the basic principles of hydromechanics, Analysis of the pattern of turbulence theory which uses the standard orifice flow meter structures detector bypass model. Establish the control equations and summarize turbulence, set up experimental boundary conditions. Under the guidance of computational fluid dynamics theory, the computational fluid dynamics software ICEM CFD and ANSYS CFX11.0 has been applied. Respectively, calculates the 25%, 15%, 10%, 5% of pipeline cross-sectional area. Analyzes the same conditions for the flow field. The fluid flows through the standard orifice flow meter which has simulated flow field of the detector within the gas pipeline under drainage station. Numerical simulation that the pressure field before and after the standard orifice has been realized when gas flowing through it, also the velocity field. Through the simulated result image, some tiny features of the detector while fluid flow through the model has been analyzed .Simulate the relation of opening cross-sectional area and differential pressure. Besides, using the different aperture with the model.The results must be an attempt for using the standard orifice flowmeter as a gas pipeline detector under drainage station. The study of operating velocity of detector within gas pipeline opened a new window in the simulation field. Simultaneity, providing support for further study of the speed control with the gas pipeline detector.