Centrifugal Blower for Personal Air Ventilation System (PAVS) - Phase 1.

摘要

Report Developed under Small Business Innovation Research Contract. A Personal Air Ventilation System (PAVS) blower was designed beginning with an analytical design based on aerodynamic similarity. A radial-axial blower design was chosen to achieve the highest possible efficiency within the size constraints of the system. The blower is able to deliver 10 ft3/min of air at 5 in H2O (1243 Pa) pressure drop while consuming less than 15 W of electrical power. Computational fluid dynamics (CFD) iterations of the blower were used to minimize losses and increase efficiency through adjustments of the specific blower geometry. CFD outputs included the total and static pressure rise, as well as shaft power input. The shaft power requirement was matched with a commercial off-the-shelf (COTS) motor such that the electrical power input was under 15 W. The motor voltage and current were matched with standard military battery cells of various chemistries, yielding run-times that exceeded the 4-hr run time requirement. A full 3D system model was constructed, and the final system volume and weight (including battery) were less than the 60 in3 and 2 lb requirements. A stereolithograph mock-up of the blower was built and delivered to demonstrate functionality.