FW Solutions for Pressure Pulse 1 Pressure Pulse
- Slides: 9
FW Solutions for Pressure Pulse 1
Pressure Pulse System pressure fluctuation Fans have to operate against substantial variations in system resistance caused by transient pressure waves from moving trains. This is particularly true in MRT stations with screen doors Total Pressure (P) Fan Operating Range Design Operating Point Fan Operating Pressure P D Fan Curve P + P - Air Flow Rate (Q) Q D 2
Fan Operation In this area, high turbulences bring low efficiency, high noise level and vibrations that may lead to blades break down 3
Fan Operation Total Pressure (P) In this area, high turbulences bring low efficiency, high noise level and vibrations that may lead to blades break down Design Operating Point PD Fan Curve P+ P- Air Flow Rate (Q) QD 4
FW Answers to Pressure Pulse • To choose a fan with enough reserve on the pressure • To select a fan with a low non stall pitch angle • To use a fan with FW Anti-Stall device 5
Fan with reserve on the pressure Total Pressure (P) Fan Operating Range Design Operating Point Fan Operating Pressure PD Fan Curve P+ P- Air Flow Rate (Q) QD 6
Anti-Stall device Fläkt Woods offers a proven Anti-Stall device with over 25 years experience. 7
Anti-Stall device § Tunnel Fans are very often subjected to severe aero-dynamic loads in the form of pressure transients generated by train movement in the tunnel. § An Anti-Stall fan will ensure stable operation under all conditions 8
Fan with low pitch angle 9
