Design of high efficiency blowers for future aerosol applications
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High efficiency air blowers to meet future portable aerosol sampling applications were designed, fabricated, and evaluated. A Centrifugal blower was designed to achieve a flow rate of 100 L/min (1.67 x 10^-3 m^3/s) and a pressure rise of WC " 4 (1000 PA). Commercial computational fluid dynamics (CFD) software, FLUENT 6.1.22, was used extensively throughout the entire design cycle. The machine, Reynolds number (Re) , was around 10^5 suggesting a turbulent flow field. Renormalization Group (RNG) ÃÂºÃ¢ÂÂÃÂµ turbulent model was used for FLUENT simulations. An existing design was scaled down to meet the design needs. Characteristic curves showing static pressure rise as a function of flow rate through the impeller were generated using FLUENT and these were validated through experiments. Experimentally measured efficiency (ÃÂ·EXP) for the base-design was around 10%. This was attributed to the low efficiency of the D.C. motor used. CFD simulations, using the ÃÂºÃ¢ÂÂÃÂµ turbulent model and standard wall function approach, over-predicted the pressure rise values and the percentage error was large. Enhanced wall function under-predicted the pressure rise but gave better agreement (less than 6% error) with experimental results. CFD predicted a blower scaled 70% in planar direction (XZ) and 28% in axial direction (Y) and running at 19200 rpm (firstname.lastname@example.org) as the most appropriate choice. The pressure rise is 1021 Pa at the design flow rate of 100 L/min. FLUENT predicts an efficiency value based on static head (ÃÂ·FLU) as 53.3%. Efficiency value based on measured static pressure rise value and the electrical energy input to the motor (ÃÂ·EXP) is 27.4%. This is almost a 2X improvement over the value that one gets with the hand held vacuum system blower.
Chadha, Raman (2005). Design of high efficiency blowers for future aerosol applications. Master's thesis, Texas A&M University. Texas A&M University. Available electronically from