Gas-liquid two-phase flow measuring device and method suitable for open-domain flow field

Abstract

The invention discloses a gas-liquid two-phase flow measuring device and method suitable for an open-domain flow field, the device comprises an electrode sensing module, an excitation measuring module and a computer, the electrode sensing module comprises an underwater model and a sensing electrode array arranged on the surface of the underwater model; the excitation measurement module comprises a microprocessor, and a multi-path change-over switch, a constant current source and a multi-path A-D converter which are electrically connected with the microprocessor, the sensing electrode array is connected with the multi-path change-over switch through a wire, the multi-path change-over switch is correspondingly connected with the multi-path A-D converter through the amplification filtering module, the constant current source is connected with the multi-path change-over switch, and the A-D converter is correspondingly connected with the constant current source through the amplification filtering module. The power supply is used for providing excitation power; and the microprocessor is in wireless communication connection with a computer through a wireless communication module. The device has the remarkable advantages of being non-invasive, simple in structure, high in cost performance, small in size, flexible in application, capable of achieving follow-up measurement, visual in measurement result and the like, and measurement of key parameters such as gas-liquid two-phase distribution and phase holdup of the near surface of an object can be achieved.

Description

technical field [0001] The invention relates to the technical field of multiphase flow measurement, in particular to a gas-liquid two-phase flow measurement device and method suitable for open domain flow fields. Background technique [0002] Multiphase flow measurement is widely used in power, thermal, petrochemical and other industrial fields. Accurate measurement of flow parameters plays a vital role in the study of fluid dynamics and the safe and stable operation of the control process. In the study of high-speed hydrodynamics, the surface of objects with relatively high relative velocity between the underwater and liquid phases will produce a gas-liquid two-phase flow system with complex flow characteristics, and its existence will lead to reduced propulsion efficiency, vibration, noise, and even cause mechanical damage. Measuring the parameters related to complex gas-liquid two-phase flow on the surface of underwater objects can assist in the study of flow field struc...

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Problems solved by technology

The high-speed photography method uses a high-speed camera to shoot the multiphase flow process to obtain the apparent flow parameters of the multiphase flow. This method has high environmental requirements, the device structure is complex, and it is difficult to obtain the internal structural parameters of the flow field; The measurement of the needle intrusion into the flow field to be measured can obtain information such as local phase holdup and bubble parameters. This method belongs to the local invasive measurement, which will interfere with the flow field to be measured and affect the measurement results; the ray method uses the radiation of X / γ rays The attenuation principle measures the flow field distribution in a non-invasive way, which has high requirements for the measurement environment, high equipment cost, complex structure, and poor flexibility. It is difficult to measure the state of the gas-liquid two-phase flow field on the surface of the moving equipment.

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