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Numerical Simulation of Flow-Induced Noise in High Pressure Reducing Valve.

Wei L, Zhu G, Qian J, Fei Y, Jin Z - PLoS ONE (2015)

Bottom Line: Noise directivity analysis and spectrum characteristics indicate that the perforated plate could help to reduce noise effectively.Inlet pressure has great effects on sound pressure level (SPL).When the maximum Ma is close to 1, SPL at low frequency becomes very high.

View Article: PubMed Central - PubMed

Affiliation: Institute of Process Equipment, Zhejiang University, Hangzhou, China.

ABSTRACT
The main objective of this paper is to study the characteristics of flow-induced noise in high pressure reducing valve (HPRV) and to provide some guidance for noise control. Based on computational fluid dynamics (CFD), numerical method was used to compute flow field. Ffowcs Williams and Hawkings Model was applied to obtain acoustic signals. The unsteady flow field shows that noise sources are located at the bottom of plug for valve without perforated plate, and noise sources are behind the plate for valve with perforated plate. Noise directivity analysis and spectrum characteristics indicate that the perforated plate could help to reduce noise effectively. Inlet pressure has great effects on sound pressure level (SPL). The higher inlet pressure will lead to larger SPL at high frequency. When the maximum Ma is close to 1, SPL at low frequency becomes very high.

No MeSH data available.


Velocity distribution of Valve B at (a) φ = 120° section and (b) φ = 150° section.Peaks in the velocity distribution are caused by jet flow through the holes. As z decreases the peaks become flat and extend in the direction of the arrows.
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pone.0129050.g009: Velocity distribution of Valve B at (a) φ = 120° section and (b) φ = 150° section.Peaks in the velocity distribution are caused by jet flow through the holes. As z decreases the peaks become flat and extend in the direction of the arrows.

Mentions: The velocity distribution of Valve B on different sections is shown in Fig 9. The curves are all behind the perforated plate. Because of the two jet flow through the holes there are two velocity peaks in Fig 9A. As z decreases the two peaks become flat and extend in the direction of the arrows. Since there is only one jet flow along radius at φ = 150° section, in Fig 9B the small peak next to the big one is induced by jet from adjacent holes.


Numerical Simulation of Flow-Induced Noise in High Pressure Reducing Valve.

Wei L, Zhu G, Qian J, Fei Y, Jin Z - PLoS ONE (2015)

Velocity distribution of Valve B at (a) φ = 120° section and (b) φ = 150° section.Peaks in the velocity distribution are caused by jet flow through the holes. As z decreases the peaks become flat and extend in the direction of the arrows.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4465344&req=5

pone.0129050.g009: Velocity distribution of Valve B at (a) φ = 120° section and (b) φ = 150° section.Peaks in the velocity distribution are caused by jet flow through the holes. As z decreases the peaks become flat and extend in the direction of the arrows.
Mentions: The velocity distribution of Valve B on different sections is shown in Fig 9. The curves are all behind the perforated plate. Because of the two jet flow through the holes there are two velocity peaks in Fig 9A. As z decreases the two peaks become flat and extend in the direction of the arrows. Since there is only one jet flow along radius at φ = 150° section, in Fig 9B the small peak next to the big one is induced by jet from adjacent holes.

Bottom Line: Noise directivity analysis and spectrum characteristics indicate that the perforated plate could help to reduce noise effectively.Inlet pressure has great effects on sound pressure level (SPL).When the maximum Ma is close to 1, SPL at low frequency becomes very high.

View Article: PubMed Central - PubMed

Affiliation: Institute of Process Equipment, Zhejiang University, Hangzhou, China.

ABSTRACT
The main objective of this paper is to study the characteristics of flow-induced noise in high pressure reducing valve (HPRV) and to provide some guidance for noise control. Based on computational fluid dynamics (CFD), numerical method was used to compute flow field. Ffowcs Williams and Hawkings Model was applied to obtain acoustic signals. The unsteady flow field shows that noise sources are located at the bottom of plug for valve without perforated plate, and noise sources are behind the plate for valve with perforated plate. Noise directivity analysis and spectrum characteristics indicate that the perforated plate could help to reduce noise effectively. Inlet pressure has great effects on sound pressure level (SPL). The higher inlet pressure will lead to larger SPL at high frequency. When the maximum Ma is close to 1, SPL at low frequency becomes very high.

No MeSH data available.