FLOW CHANNEL AND METHOD OF DETERMINING LIQUID FLOW RATE THROUGH WORKING PART OF FLOW CHANNEL Russian patent published in 2011 - IPC G01M10/00 

FIELD: physics.

SUBSTANCE: flow channel has a housing with inlet and outlet chambers formed by a lower bottom and two lateral walls on the said bottom, inlet and outlet faces of the walls, two lateral recirculation channels formed by the corresponding part of the upper bottom, lateral and separation walls, a working part, a pipe for filling the loop with liquid, ejectors, a discharge control device, apparatus for moving and fixing the position of the ejectors, a levelling device, flow-measuring devices, two flat longitudinal inserts, at least one flat transverse insert, apparatus for moving and fixing the position of the longitudinal and transverse inserts, respectively, discharge and by-pass pipes, liquid flow regulators, inlet and outlet pipes and a pump. The following operations are performed when determining flow of liquid through the working part of the flow channel. The flow part of the flow channel and ejectors connected to the said part, which form the circulation loop, the by-pass, inlet and outlet pipes and the pump are first filled with liquid through the pipe for filling the loop. Liquid is then fed by the pump from the inlet pipes through the ejectors to the lateral recirculation channels. Liquid is successively pumped through the lateral recirculation channel, the inlet chamber, the working part and the outlet chamber. Liquid is simultaneously tapped from the outlet chamber through gaps between ends parts of the separating walls and the inlet face of the wall and through the controlled liquid discharge device. A uniform liquid flow velocity profile is ensured at least at the inlet of the outlet chamber using the levelling device. The longitudinal inserts are moved along the inlet face of the wall and are fixed in that position, where the flow of liquid in the working part up to the longitudinal inserts is along its longitudinal axis of symmetry. Positions of ejectors, longitudinal and transverse inserts are moved and fixed using suitable apparatus. Readings of the flow-measuring devices are taken and mass flow of the liquid through the said devices is determined. Temperature of the liquid stream is measured and its density is determined. Mass flow of liquid through the working part is determined using an approximate relationship taking into account mass flow of liquid through the flow-measuring device, the width of the gaps between the corresponding separation wall and the longitudinal insert and between the longitudinal inserts.

EFFECT: high accuracy of determining mass flow of liquid through the working part of a flow channel.

14 cl, 4 dwg