| The aerodynamic field in furnaces is an important factor determining the safe and economical operation,so it is necessary to detect the dynamic field in the boiler.In the hot condition,the measurement of the dynamic field in the furnace is harsh,and the traditional method is difficult to detect accurately and effectively.As a new non-contact measurement technique,acoustic wave can realize real-time detection,simple measurement method and high precision,which is very important for on-line detection of furnace.Therefore,this paper presents a two-dimensional velocity field reconstruction method based on the quasi-Newton method,and studies the feasibility and rationality of the algorithm by constructing an acoustic experimental platform.First of all,this paper summarizes the common methods of measuring the aerodynamic field in the furnace,and proposes the advantage of acoustic velocity reconstruction method and the algorithmic problems that need to be solved at present.The research contents and methods are determined.The basic principle of using sound wave method to detect the velocity field in the furnace is introduced.The propagation characteristics of space plane acoustic wave and the algorithm of cross-correlation are used to calculate the time-of-flight and quasi-Newton method.The study of sound wave propagation characteristics provides guidance for the further development of acoustic experiments.Combined with quasi-Newton algorithm to expand the sound wave method to measure the experimental two-dimensional velocity field,according to the design principle to determine the furnace model size and diameter fan parameters.The quasi-Newton method was used to measure the aerodynamic field in the furnace.The reconstruction of the flow field in the hearth was realized by the reconstruction of the ribbons and reconstructed vector diagram.The results show that the reconstruction algorithm can realize the monitoring of the flow field in the furnace. |
PDF Full Text Request