Wavenumber-Frequency Analysis of Internal Aerodynamic Noise in Constriction-Expansion Pipe

Kim, Kuk-Su; Ku, Garam; Lee, Songjune; Park, Sung-Gun; Cheong, Cheolung

doi:10.3390/app7111137

Cited by 6 publications

(9 citation statements)

References 4 publications

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“…The corresponding unsteady phenomena can be identified in Figure 11, which is discussed in detail in the next section. The similar phenomenon was also observed and discussed in the preceding study by Kim et al [8].…”

Section: Three-dimensional Steady Simulationsupporting

confidence: 89%

“…The superscript~denotes the Favre-(or mass-) averaged physical quantity and is used to consider the compressibility of the turbulent structure. e t is the total energy, and the physical quantity by the superscript + is given by Equation (8). c v is the static specific heat, R is the gas constant, and ν is the kinematic viscosity [12].…”

Section: Governing Equationsmentioning

confidence: 99%

“…Since the target problem of this study is a circular pipe, the Fourier transform in the cylinder coordinate system is more suitable. From the previous study, the wavenumber-frequency analysis is performed in the form [8],…”

Section: Acoustic Power Due To Internal Flow Noisementioning

confidence: 99%

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Development of High-Fidelity Numerical Methodology Based on Wavenumber-Frequency Transform for Quantifying Internal Aerodynamic Noise in Critical Nozzle

Lee

Cheong

et al. 2019

Applied Sciences

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In industrial fields dealing with high-temperature and high-pressure gas such as chemical, petrochemical, and offshore oil production plants, piping systems with valves are frequently used to protect the relevant system and equipment from being damaged by such gases. However, excessive noise is sometimes generated by the valve flow in the piping system, causing so-called acoustic induced vibration in the pipe wall. Therefore, it is of great importance to design the related system to avoid this phenomenon. In this study, a high-fidelity numerical procedure is proposed to assess the acoustic power generated by pressure relief devices in a pipe. The method consists of three sequential steps: high accuracy large eddy simulation, wavenumber-frequency transform, and duct acoustic theory. The critical nozzle is selected as a target system since it is commonly used as a flowmeter and thus there are a lot of relevant data for comparison. First, the steady Reynold-Averaged Navier–Stokes (RANS) solver is used to predict the flow rate of the two-dimensional axisymmetric critical nozzles, and its validity is confirmed by comparing the predicted results with the measured ones. There is good agreement between the two results. Then, a high accuracy Large Eddy Simulation (LES) technique is performed on the three-dimensional critical nozzle, and the steady-state RANS result is used as the initial condition to accelerate the convergence of the unsteady simulation. The validity of the unsteady LES results is also confirmed by comparing them with measured surface pressure data. The wavenumber-frequency transform is taken on the LES results, and the compressible surface pressure components matching the acoustical duct modes are identified in the wavenumber-frequency pressure diagram. The inverse wavenumber-frequency transform taken on the compressible pressure components leads to the acoustic power spectrum. These results reveal that the current numerical procedure can be used to more accurately predict the acoustic power generated by pressure relief device in the piping system.

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Section: Three-dimensional Steady Simulationsupporting

confidence: 89%

Section: Governing Equationsmentioning

confidence: 99%

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Development of High-Fidelity Numerical Methodology Based on Wavenumber-Frequency Transform for Quantifying Internal Aerodynamic Noise in Critical Nozzle

Lee

Cheong

et al. 2019

Applied Sciences

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“…When the static pressure difference between the inlet and the outlet of pipe flow increases, the air flow is accelerated along the converging nozzle, and a choked flow is formed, in which the Mach number is maintained to be one in the nozzle. However, if the pressure difference continues to increase, the Mach number at the nozzle is maintained at 1, but the downstream flow is more accelerated to be supersonic in the diffusion region [27]. Note that the increase of the static pressure and the decrease of Mach number near the exit of main pipe are due to the diverging diffuser, as shown in Figure 12…”

Section: Pressure and Velocity Distributions Inside Hybrid Pumpmentioning

confidence: 98%

Development of Hybrid Airlift-Jet Pump with Its Performance Analysis

Yao

Lee

et al. 2018

Applied Sciences

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A new pump, called the hybrid airlift-jet pump, is developed by reinforcing the advantages and minimizing the demerits of airlift and jet pumps. First, a basic design of the hybrid airlift-jet pump is schematically presented. Subsequently, its performance characteristics are numerically investigated by varying the operating conditions of the airlift and jet parts in the hybrid pump. The compressible unsteady Reynolds-averaged Navier-Stokes equations, combined with the homogeneous mixture model for multiphase flow, are used as the governing equations for the two-phase flow in the hybrid pump. The pressure-based methods combined with the Pressure-Implicit with Splitting of Operators (PISO) algorithm are used as the computational fluid dynamics techniques. The validity of the present numerical methods is confirmed by comparing the predicted mass flow rate with the measured ones. In total, 18 simulation cases that are designed to represent the various operating conditions of the hybrid pump are investigated: eight of these cases belong to the operating conditions of only the jet part with different air and water inlet boundary conditions, and the remaining ten cases belong to the operating conditions of both the airlift and jet parts with different air and water inlet boundary conditions. The mass flow rate and the efficiency are compared for each case. For further investigation into the detailed flow characteristics, the pressure and velocity distributions of the mixture in a primary pipe are compared. Furthermore, a periodic fluctuation of the water flow in the mass flow rate is found and analyzed. Our results show that the performance of the jet or airlift pump can be enhanced by combining the operating principles of two pumps into the hybrid airlift-jet pump, newly proposed in the present study.

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“…Another paper of this issue [17], estimated the internal aerodynamic noise due to valve flow in a simple constriction-expansion pipe (a pressure relief device), by combining the large eddy simulation technique with a wavenumber-frequency analysis, which made it possible to decompose the fluctuating pressure into the incompressible hydrodynamic pressure and compressible acoustic pressure. The results showed that the acoustic pressure fluctuations in a pipe could be separated from the incompressible ones.…”

Section: The Present Issuementioning

confidence: 99%