Synchronization measurement device for wall-adherent jet speed field and concentration field and method

Abstract

The invention discloses a synchronization measurement device for a wall-adherent jet speed field and a concentration field, consisting of a coal-powder boiler modularized device, an oxygen sensitive coating wall surface, a high speed CCD camera, a PIV camera, a high intensity excitation light source, a pulse laser sheet light source, an uniform mixing chamber, a synchronization controller and a computer. The PIV camera is utilized to shoot the flowing track of PIV particles in a main air flow in the wall-adherence jet, the high speed CCD camera is utilized to shoot the color rendering rule of the oxygen sensitive coating wall surface along the change of the oxygen concentration in the jet, and the synchronization measurement of the speed field and the concentration field in the process of mutual interaction of the wall-adherence jet and the main flow is realized through the controller regulating and controlling the interval frame working mode between the PIV camera and the high speed CCD camera. . The invention realizes the synchronization measurement in the process of air-air mutual interaction, which not only obtains the turbulence flowing characteristics of the wall adherence jet, but also obtains component transportation characteristics of the specific component in the jet air. The invention benefits the comprehensive understanding the convection movement of the jet air and the diffusion process, and provides reference to the optimization design and the operation parameter of the nozzle.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow parameter measurement, and in particular relates to a method and device for synchronously measuring velocity field and concentration field of wall-attached jet. Background technique [0002] Hedge combustion boilers often use air staged combustion to control NOx emissions, but staged combustion will produce strong corrosive gases, which can easily damage the iron oxide protective film on the surface of the water wall, resulting in severe high-temperature corrosion of the water wall. At present, the most effective way to solve the problem of high-temperature corrosion of the water-cooled wall of the opposed combustion boiler is to introduce a wall-attached jet to form a gas film and block the action of corrosive gases on the wall. However, how to organize the wall-attached jet to prevent high-temperature corrosion is a new problem encountered in the safe operation of the boiler, which needs...

AI Technical Summary

Problems solved by technology

[0010] Purpose of the invention: the present invention is aimed at the fact that it is difficult to accurately obtain the velocity field of the jet in the mainstream when the wall-attached jet interacts with the swirling flow and the mainstream, and that the concentration field of the oxygen component cannot be obtained in real time during the diffusion process of the wall-attached jet in the mainstream, etc. Problem, providing a simultaneous measurement device and method for the concentration field and velocity field of the wall-attached jet

Images