Star CCM+ 风机模拟.pdfVIP

University of Applied Sciences HTW Berlin, FB2 Wilhelminenhofstr. 75A, 12459 Berlin, Germany Thermo- Fluid dynamics group Prof. Dr.-Ing. Stefan Frank e-mail : stefan.frank@htw-berlin.de Numerical Investigations on the Performance Characteristic of Radial Fans with Forward Curved Blades by means of CFD Manoochehr Darvish , Stefan Frank STAR European Conference 2011 March 22-23 Agenda   Sirocco fan Introduction ◊  Applications ◊  Advantages/Disadvantages ◊  Characteristic curves   Model parameters / Modeling physics   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) Key factors for fan type selection: ◊ Pressure ◊ Flow rate ◊ Efficiency Forward curved Radial-Tip blades Radial blades blades (65%) (70%) (60%) ◊ Noise generation ◊ Space constraints ◊ Drive configuration ◊ Cost ◊ ... Backward inclined Backward inclined Backward curved Airfoil blades (92%) blades (78%) blades (85%) 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 Best Efficiency Point (BEP) Region of Instability