Journal
ENERGIES
Volume 15, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/en15155393
Keywords
nozzle check valve; PIV; hydraulic loss; dynamic behavior; piping system
Categories
Funding
- National Natural Science Foundation of China [51279145]
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This study investigated the static characteristics and dynamic behavior of a nozzle check valve in industrial piping systems using an experimental bench and PIV technique. The research found that valve disc displacement increases with flow rate, pressure drop and flow obey a quadratic function when Reynolds number exceeds a certain value, and the local vortex area near the flow passage expands with flow improvement.
In the present work, to investigate the hydraulic losses and safe operation of nozzle check valves in industrial piping systems, the static characteristics of the valve and its dynamic behavior in the pipeline system were studied using an experimental bench with a visual DN300 nozzle check valve. Besides, basing on the PIV (Particle Image Velocimetry) technique measures the valve steady-state flow field under the different flow rates. The study has shown that as the flow rate rises, the valve disc displacement slowly increases to 44 mm, then rapidly increases to a maximum displacement of 72 mm. When the Reynolds number exceeds 5 x 10(5), the relationship between pressure drop and flow obeys a quadratic function. The local vortex area formed by the flow passage near the downstream deflector expands with the flow improvement. As the increase of flowrate, at low flow operating conditions, the downstream flow velocity in the local high-speed area near the valve body increases; at medium operating conditions, the area's flow velocity decreases; at high flow work, this local high-speed area disappears. When the fluid deceleration is lower than 4 m/s(2), the dynamic behavior satisfies the quadratic curve when the maximum slope is only 0.354, which shows that this nozzle check valve has a favorable response to the system.
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