Pneumatic Noise Study of Multi-Stage Sleeve Control Valve
Abstract
:1. Introduction
2. Valve Structure and Working Principle
3. Flow Field Calculation
3.1. Geometric Model and Meshing
3.2. Calculation Method
3.3. Calculation Results and Analysis
4. Sound Field Calculation
4.1. The FW-H Acoustic Fitting Theory
4.2. Calculation Method
4.3. Calculation Results and Analysis
4.4. Numerical Simulation Method Validation
5. Conclusions
- Analysis of the steam medium within the control valve under operating conditions revealed important aspects such as the Mach number, turbulence, and static pressure distribution. It was observed that the disturbance caused by high-speed flow in the valve components increased the intensity of turbulence energy. Consequently, the high turbulence energy led to steam pressure pulsations, which served as a primary source of noise.
- The study revealed a symmetrical distribution of sound pressure levels along the tube and valve system of the control valve. Furthermore, it was observed that pneumatic noise exhibited directional characteristics, with significantly higher noise levels detected upstream and downstream of the valve compared to other regions.
- Among the many monitoring points selected, the noise of monitoring point 8 was 157.86 dB (A) in theoretical calculation and 161.95 dB (A) in numerical analysis, and the difference between the two results was 4.09 dB (A). At monitoring point 6, the difference was 1.16 dB (A). The error of the monitoring points was less than 5%, which verifies the effectiveness of the numerical simulation method.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Maximum Size/mm | Number of Grids × 106 | Mass Flow/(kg·s−1) |
---|---|---|
1.5 | 3.24 | 20.56 |
1.8 | 2.85 | 20.66 |
2.0 | 2.70 | 20.68 |
2.5 | 2.43 | 21.02 |
3.0 | 1.98 | 21.65 |
3.8 | 0.99 | 24.40 |
Medium | Vapor |
---|---|
Inlet pressure | 6.86 Mpa |
Inlet temperature | 284.9 °C |
Outlet pressure | 1 Mpa |
Viscosity | 1.89 × 10−5 kg/(m·s−1) |
Density | 35.7 kg/m3 |
Valve walls | Adiabatic no-slip boundary |
Residual Setting | Start of Calculation | After 10,000 Steps |
---|---|---|
Courant number | 1 | 5 |
Turbulent Kinetic Energy | 0.2 | 0.8 |
Turbulent Dissipation Rate | 0.2 | 0.8 |
Turbulent Viscosity | 0.2 | 1 |
Solid | 0.2 | 1 |
Type Fluid | Vapor |
---|---|
Mass flow rate | m = 20 kg/s |
Valve inlet absolute pressure | P1 = 6.86 MPa |
Valve outlet absolute pressure | P2 = 1 MPa |
Inlet density | ρ1 = 35.7 kg/m3 |
Inlet absolute temperature | T1 = 558.05 K (284.9 °C) |
Specific heat ratio | γ = 1.885 |
Molecular mass | M = 19.8 kg/kmol |
Required Cv | Cv = 101 |
Valve size | DN125 |
Valve outlet diameter | D = 0.241 m |
Internal pipe diameter | D1 = 0.241 m |
Differential pressure ratio | x = 0.985 |
Absolute Vena contracta pressure at subsonic flow conditions | Pvc = −1,482,098 pa |
Vena contracta differential pressure ratio at critical flow conditions | xvcc = 0.542 |
Differential pressure ratio at critical flow conditions | Xc = 0.438 |
Recovery correction factor | α = 0.817 |
Differential pressure ratio at breakpoint | XB = 0.683 |
Differential pressure ratio where region of constant acoustical efficiency begins | XCE = 0.944 |
Regime definition | XCE < X, Regime V. |
Hydraulic diameter of a single flow passage | dH = 0.575 |
Diameter of a circular orifice | do = 3.582 |
Valve style modifier | Fd = 0.16 |
Jet diameter | Dj = 0.007 |
Strouhal number of free jet at peak frequency | Stp = 0.2 |
Correction factor of sound effect coefficient | Aη = −3.8 |
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Jia, J.; Shi, Y.; Meng, X.; Zhang, B.; Li, D. Pneumatic Noise Study of Multi-Stage Sleeve Control Valve. Processes 2023, 11, 2544. https://doi.org/10.3390/pr11092544
Jia J, Shi Y, Meng X, Zhang B, Li D. Pneumatic Noise Study of Multi-Stage Sleeve Control Valve. Processes. 2023; 11(9):2544. https://doi.org/10.3390/pr11092544
Chicago/Turabian StyleJia, Jianbo, Yan Shi, Xianyu Meng, Bo Zhang, and Dameng Li. 2023. "Pneumatic Noise Study of Multi-Stage Sleeve Control Valve" Processes 11, no. 9: 2544. https://doi.org/10.3390/pr11092544
APA StyleJia, J., Shi, Y., Meng, X., Zhang, B., & Li, D. (2023). Pneumatic Noise Study of Multi-Stage Sleeve Control Valve. Processes, 11(9), 2544. https://doi.org/10.3390/pr11092544