Prediction of quarter-wave instability in direct spring operated pressure relief valves with upstream piping by means of CFD and reduced order modelling

Erdődi, István; Hős, Csaba

doi:10.1016/j.jfluidstructs.2017.05.003

Cited by 25 publications

(10 citation statements)

References 24 publications

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“…Flutter or chatter due to negative damping of the fundamental "organ pipe" acoustic mode in an overly long inlet pipe [13]. Erdődi and Hős [14] summarised a number of factors that contribute to the instability of the valve response, although no one study considered all of the following contributing factors:…”

Section: Influence Of Pressure Valve On the Oil Flow Instabilitiesmentioning

confidence: 99%

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Pressure Surge Analysis of a Test Bench for Biodegradable Hydraulic Oils

Majdan¹,

Olejár²,

Abrahám³

et al. 2018

Tribol. Ind.

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A test bench for biodegradable hydraulic oils generates pressure surges by cyclic pressure loading. The parameters of these pressure surges (maximum pressure, amplitude, frequency etc.) are defined by the characteristics of the pressure valve and pipe line system. The response of the hydraulic system was recorded and studied in the case of four test bench modifications by comparing the maximum pressure, maximum pressure increase and the opening time of the pressure valve. The test bench with steel pipe between the hydraulic pump and pressure valve shows the highest maximum pressure increase (4.28 MPa). The opening times of pressure valve were measured for the evaluation of dynamic stability of the test bench. In case of all test bench modifications the opening time of pressure valve did not exceed the calculated limit value. The experiments were also aimed at the response of hydraulic system to three different frequencies (1.5 Hz, 2.5 Hz and 5 Hz) of cyclic pressure loading. Increasing the frequency only minimally increases the maximum pressure during the pressure surge. On the other hand, it increases maximum amplitude after the maximum pressure depending up to frequency of cyclic pressure loading. Fast Fourier Transform (FFT) confirms the facts mention above.

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Section: Influence Of Pressure Valve On the Oil Flow Instabilitiesmentioning

confidence: 99%

“…The setting of the blow-down ring, which determines the re-closure conditions for the valve. This setting also affects the geometry and dimensions of the flow path of the fluid in contact with the disk [14];…”

Section: Influence Of Pressure Valve On the Oil Flow Instabilitiesmentioning

confidence: 99%

Pressure Surge Analysis of a Test Bench for Biodegradable Hydraulic Oils

Majdan¹,

Olejár²,

Abrahám³

et al. 2018

Tribol. Ind.

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“…This coupling simulation technology uses the discrete element method 16 to describe the motion of solid phase, and carries out particle information statistics by tracking the motion of a single particle along the system and calculating the motion state of particles. CFD 17 algorithm is usually used to simulate the flow field of continuous fluid phase (gas or liquid). 18 The first application of the combined CFD-DEM model was reported to be the numerical simulation of a two-dimensional gas fluidized bed, where the motion of individual particles and particle-particle interactions were calculated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of gas-solid two-phase flow characteristics of mobile shot blasting machine recovery device based on CFD-DEM

Zhang

Men

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The shot blasting machine recovery device is an important part of the operation of the shot blasting machine to recover solid particles and reduce environmental pollution. The recovery efficiency of solid particles has an important influence on their processing efficiency and service life. The computational fluid dynamics and discrete element method (CFD-DEM) simulation method is applied to study the gas-solid two-phase flow characteristics and solid particle recovery efficiency of shot pellet recovery unit. The results show that the simulation results of outlet and inlet wind speeds and pressures are in good agreement with the experimental data, which verifies the accuracy of the simulation model. The existence of particle phase divides the recovery pipeline into inner high-speed flow area and outer low-speed flow area, which has little influence on the air flow distribution inside the recovery bin. The results of solid particle recovery efficiency show that with the increase of incident angle, the recovery efficiency of waste particles and shot particles first decreases and then increases, and the recovery efficiency is the lowest when the incident angle is 30°. With the increase of particle formation rate, the efficiency of shot recovery first increases and then decreases. When the particle formation rate is 2000 n/s, the efficiency of shot recovery is the highest, which has little influence on the efficiency of waste recovery.

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“…The results indicate that the main reason for pressure perturbation generation for national gas pipelines is the sonic fluctuation, and they draw conclusions that the CFD simulation on the acoustic leak detection and location method for gas pipeline is an efficient way to carry out research. Erdődi and Hős proposed a CFD method for analysing the fluid forces and its stability. A dynamic instability of gas‐serviced operation pressure valves was modelled due to acoustic coupling between the valve body and the piping.…”

Section: Introductionmentioning

confidence: 99%

Simulation and detection of blockage in a pipe under mean fluid flow using acoustic wave propagation technique

Abdullahi

Oyadiji

2020

Struct Control Health Monit

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Summary Pipeline blockage can result in the reduction of system carrying capacity, energy and resource wastage, and potential increase in the probability of occurrence of environmental and health problems. The primary purpose of this paper is to demonstrate a methodology to simulate acoustic wave propagation (AWP) in partially blocked fluid‐filled pipes with flow under different flow velocities. This was achieved by using computational fluid dynamics (CFD) software in conjunction with an external user‐defined function (UDF) file, which introduces compressibility effect into the CFD solution. The use of finite element analysis (FEA) to simulate AWP in fluid‐filled pipelines with blockage has been previously reported without flow. In this paper, both CFD and FEA techniques were used to simulate the AWP in air‐filled pipelines without mean flow. However, it is shown that only the CFD technique could be used to simulate the AWP in air‐filled pipelines with mean flow. The secondary purpose of the paper is to use the simulated acoustic waveforms to illustrate a blockage identification procedure for detection, localisation, and sizing of blockages in fluid‐filled pipes using time of flight (ToF) methodology. It is shown that the ToF accurately detects and locates blockages in blocked pipelines. The errors in the localisation of blockages were less than 4%. Furthermore, the effects of blockage size and the mean flow velocity on the AWP characteristics are established. It is shown that both the size of the blockage in a pipe and the mean flow velocity affect the pressure amplitude of the transmitted and reflected waveforms.

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Prediction of quarter-wave instability in direct spring operated pressure relief valves with upstream piping by means of CFD and reduced order modelling

Cited by 25 publications

References 24 publications

Pressure Surge Analysis of a Test Bench for Biodegradable Hydraulic Oils

Pressure Surge Analysis of a Test Bench for Biodegradable Hydraulic Oils

Analysis of gas-solid two-phase flow characteristics of mobile shot blasting machine recovery device based on CFD-DEM

Simulation and detection of blockage in a pipe under mean fluid flow using acoustic wave propagation technique

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