Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system

The invention pertains to the technical field of fluid measurement, which relates to a slit Venturi throttle device, including an entrance, a contraction section, a slit section, an expansion section and an exit which are connected sequentially, the contraction section is a section of long narrow pipeline, the cross-section of the contraction section takes a shape of a long narrow rectangle, and the area of the cross section thereof is smaller than the area of the cross sections of the entrance and the exit. The invention also provides a two-phase flow measurement system which adopts the throttle device. The Venturi throttle device and the two-phase flow measurement system which are provided by the invention can effectively eliminate the influence of the friction pressure drop on the measurement, the devices can be applicable to the different gas-liquid two-phase media, different pipeline materials and other working conditions, and the factors which are related with the friction forceand affect the measurement can be reduced or eliminated. The invention makes use of the gravity potential pressure difference pulse signals and the time equalization signals which are perpendicular to the horizontal flow direction, at the same time, the invention can avoid the influence of the frictional resistance and accurately identify the flow type and measure the fraction rate, furthermore, the implementation is simple and convenient.