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Edit: Standard Electrical Co., Ltd. Shenzhen wind turbine experts more price and specifications, please visit our Ali official website: http: //fbemf2014.1688.com/ blower air purifier model specifications varieties, price concessions, brand louder ! The following information is taken from the network, for reference: centrifugal fan contrast different flow field flow analysis Introduction centrifugal fan internal flow field is very complex and difficult to obtain with the test methods entirely. Today, the rapid development of compute fluid dynamics and computer numerical simulation method of internal flow field of fluid machinery research is relatively mature, and therefore become an important means of numerical simulation study Turbomachinery flow field, but the centrifugal fan in Understanding the flow characteristics under different working conditions is still not comprehensive enough. In this paper, a high specific speed centrifugal fan airflow inside the three-dimensional numerical simulation under different working conditions calculated to reveal the actual situation of the fan flow, flow characteristics were analyzed under different operating conditions. Build a physical model of paper establishes fan model to 4-72 centrifugal fan for the study, the fans belong to strong winds, low pressure type fan, both as an input gas, the gas can also be used as an output, it is a high-efficiency, low pressure and low noise fan, the maximum efficiency of 91%. Good aerodynamic performance, high efficiency and smooth operation. The fan model consists of three basic components: a current collector, impeller and volute. Collector using arc, and made into a fan mounted on the side as a whole, and axial horizontal cross-section shape of the curve, the gas can smoothly enter the impeller, minor damage; impeller made 10 after dumping a "hollow airfoil "blade, curved front plate and the plate after plate composition formula; volute using a primitive method of equilateral draw, impeller diameter of 500mm. Complete three-dimensional modeling software SolidWorks in solid geometry model, its overall structure, shown in Figure 1. Meshing save SolidWorks geometry built for parasolid format, then import Gambit in. When meshing in Gambit, in order to facilitate the setting of boundary conditions, the fan is divided into three parts: the collector section, impeller and volute section section. Because of the complexity of the geometry, the use of three-dimensional unstructured grids. Although this mesh generation process is more complex, but has an excellent adaptability to simulate complex flow field boundary issues are particularly effective. Finally get current collector, the number of impeller and volute volume mesh, the overall total of more than 2.5 million grid points. After the fan mesh finite element model (Figure 2). Set the appropriate boundary conditions, the resulting grid files with boundary conditions. Fluent is set boundary conditions for simulating and analyzing complex dedicated CFD software flow and heat exchange fluid within the geometric area, and provides a flexible grid feature, users can easily use the structure in which the pre-processing software Gambit grid and unstructured grid for complex region mesh. Working pressure is standard atmospheric pressure 101325Pa, on imports of imported speed, by varying the speed to regulate the import of fan flow, a flow outlet freedom of choice. Calculated that the airflow in the fan for the incompressible unsteady flow, choose air density 1.225kg / m3, and ignore the gravity of the gas. Separate discrete equations implicit solver selection, selection criteria k-ε two equation turbulence model, using standard wall function. SIMPLEC algorithm using equations, using a discrete order upwind scheme, set up the residual convergence factor of 10-5. Calculated using a sliding mesh method, volute wall still, do impeller rotation speed of 2900r / min.