star ccm+ 风机模拟
20页1、University of Applied Sciences HTW Berlin, FB2 Wilhelminenhofstr. 75A, 12459 Berlin, Germany Thermo-& Fluid dynamics group Prof. Dr.-Ing. Stefan Frank e-mail : stefan.frankhtw-berlin.de Manoochehr Darvish , Stefan Frank STAR European Conference 2011 March 22-23 Numerical Investigations on the Performance Characteristic of Radial Fans with Forward Curved Blades by means of CFD Agenda Sirocco fan Introduction Applications Advantages/Disadvantages Characteristic curves Model parameters / Modeling p
2、hysics CFD Simulations outline Rotation modeling Overview of the generated mesh configurations Results Characteristic curves: CFD vs. Experiment Simulation time Steady vs. Unsteady simulations Conclusions 3 Commonly used blade shapes in Radial fans (with their maximum attainable efficiencies) Forward curved blades (65%) Radial-Tip blades (70%) Radial blades (60%) Backward inclined Airfoil blades (92%) Backward inclined blades (78%) Backward curved blades (85%) Key factors for fan type selection:
3、 Pressure Flow rate Efficiency Noise generation Space constraints Drive configuration Cost . 4 Sirocco fan specifications Large blade angles Small size relative to other fan types Operation at low speeds low level of noise Flow separation between the blades Low efficiency Scroll housing is required Applications: Automotive industry HVAC applications 5 Sirocco Fan Performance Curve Region of Instability Best Efficiency Point (BEP) Throttle Range Overload Range 6 Model Parameters Fan wheel outer d
4、iameter (D2) :200 mm Inner/Outer diameter (D1/D2) : 0.8 Number of blades : 38 Rotor width : 82 mm Scroll housing width: 87 mm Volute opening angle () :7 Modeling Physics Ideal gas Segregated flow Mass Inlet / Pressure outlet Rotational speed:1000 rpm Steady-State Moving Reference Frame (MRF) Rotor Positions: 0,3,6 7 CFD Simulations outline Turbulence models Mesh Configuration Realizable k- SST k- Spalart-Allmaras Polyhedral Trimmer Polyhedral-Trimmer Structured grid CFD Simulations Unsteady (Rig
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