高效低噪9-19型离心风机模型开发与噪声控制研究.docx

Abstract
Recently years, under the general trend of energy saving, the products which have high efficiency and low noise are much favored by the users and enterprises. This article aimed at the problem of high noise and inefficient during the operation of the series 9-19 centrifugal fan which was used widely to expand research. The bined with simulation and test were used to on the impeller flow channel, volute flow channel and the whole machine channel. The main factors of the noise and inefficiency had been analyzed, and the aerodynamic noise had been forecasted. This article aims to provide some references and basis for the study of energy efficiency and noise on centrifugal fan. the main works are as following:
To analyze the internal flow field, come to the information of the flow field irrational structure, this article modeled the three-dimensional model and meshed the full flow channel of the original forward curved centrifugal fan in considering the premise of the boundary layer , carried out numerical simulation on steady.
For the aerodynamic noise, based on the steady calculation of the original fan, the FLUENT broadband noise model was used to analysis the turbulent noise of the fan. Taking the steady calculation as the foundation, the bined CFD and the third acoustic software was used to analysis the amplitude and near field noise on the blade surface and the inner surface of the casing, the far field noise also had been got by using numerical calculation and aerodynamic noise prediction. The accuracy of the noise prediction was verified. According to the results of the noise prediction, analyzed the mainly cause of the noise on the fan.
According to the parameter of structure and performance, the existing performance optimization methods on centrifugal fan had been summarized. Combined the e from the numerical simulation on the internal flow field of the original fan, the design modification of the centrifugal fan had been presented. By controlling