Analysis of Unsteady Flow Through a Throttle Valve Using CFD

Chalet, David; Chessé, Pascal

doi:10.1080/19942060.2010.11015326

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…Nevertheless, relatively large time consumption and inflexible boundary conditions have limited the application of the CFD method in the dynamic modeling of hydraulic valves. The method of combining 3D CFD simulation with traditional calculation equations, in which the result of CFD simulation is extracted to amend the parameters in the equations, has proved the practicability in modeling a valve (Chalet & Chesse, 2010), but it also has the drawback of repetitive work and decrease of accuracy. In this paper, the Proper Orthogonal Decomposition (POD) method is implemented to decompose the fluid field on a specific surface of a cartridge valve, so that a minor amount of the CFD solution data can be used to represent the characteristics of the fluid field.…”

Section: Introductionmentioning

confidence: 99%

Application of flow field decomposition and reconstruction in studying and modeling the characteristics of a cartridge valve

Kong

Wei

Yan

2018

Engineering Applications of Computational Fluid Mechanics

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In modeling the characteristics of a cartridge valve with traditional methods, it is commonly required to determine the value of flow area and other coefficients such as discharge coefficient and jet angle, etc. However, these parameters often rely heavily on empirical or experimental data and often involve some uncertainties, especially with the variation of the spool displacement (valve opening). To avoid these uncertainties, this paper proposes a modeling method which calculates spool force and flow rate directly through the distribution of fluid field. Transient 3D flow field simulation with dynamic mesh technique is conducted using commercial code FLUENT, and Proper Orthogonal Decomposition (POD) method is introduced to simplify fluid field data. The results showed that the POD method can capture the main features of the fluid field while significantly reducing the amount of data. With reconstructed pressure field and velocity field, spool force and flow rate can be calculated directly without using traditional formulas which contain uncertain coefficients. Valve characteristics calculated with this method agree with Computational Fluid Dynamics (CFD) and experimental data well, which confirms the validity and effectiveness of this method.

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Section: Introductionmentioning

confidence: 99%

Application of flow field decomposition and reconstruction in studying and modeling the characteristics of a cartridge valve

Kong

Wei

Yan

2018

Engineering Applications of Computational Fluid Mechanics

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“…This means that the downstream tube (1-2) is controlled by a pressure termination p 2 , while the upstream tube (3)(4) is controlled by a mass flow termination qm 3 . This explains the choice to write the transfer matrix in the form given by equation (23).…”

Section: Coupling the Transfer Matrix To Gt-powermentioning

confidence: 99%

Wave dynamics measurement and characterization of a charge air cooler at the intake of an internal combustion engine with integration into a nonlinear code

Mezher

Chalet

Migaud³

et al. 2014

International Journal of Engine Research

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There exist two fundamental tools for modeling and simulating wave action of internal combustion engines. The first is a nonlinear time domain solution of the Euler equations using a space-time meshing. The second is a frequency domain solution of the linear wave equations. These two methods exist with a wide range of complexity and sophistication. Hybrid coupled methods also exist; they attempt to bridge the gap between the two techniques while maintaining the overall goal of engine simulation in mind. This work deals with the frequency characterization of a complex intake element, the charge air cooler. First, a transfer matrix for a simple tube is defined and measured. Two identical versions of the previous tube serve for identifying the transfer matrix of the charge air cooler directly on an operating four-cylinder turbocharged engine. Once the transfer matrix is measured, it is coupled to GT-Power as four transfer functions coded into Simulink. The final validation comprises two tubes in GT-Power with measured boundary conditions of pressure and mass flow with the Simulink model in between. Results are presented in the time and frequency domains with future objectives and perspectives as well.

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“…Numerical studies of pressure wave propagation through engine manifolds have been made onedimensionally and, in most applications, by using the method of characteristics 13 or the mass-spring analogy. 14 The application of finite volume methods can be found to focus the flow through throttle valves in order to generate input data for simplified models, 15 or even the in-cylinder flow where a pressure-based method is widely used, the first developments of which have been presented by Harlow and Welch, 16 Raithby and Schneider 17 and Patankar. 18 There are two main methodologies found in the literature: pressure-based formulations and density-based formulations.…”

Section: And the Book By Winterbone And Pearsonmentioning

confidence: 99%

Numerical study of an internal combustion engine intake process using a low Mach number preconditioned density-based method with experimental comparison

Falcão

Soriano

Rech

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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When air flows unsteadily in an internal combustion engine through its inlet pipe, chambers and valves, some effects such as friction and inertial forces have direct influence on the volumetric efficiency of the system. The work in this paper aims to investigate numerically and experimentally the pulsating phenomena present in an intake pipe of an internal combustion engine and to discuss the intake jet flow predictions through the novel implementation of a low Mach number preconditioned density-based method, including the three-dimensional modelling of the inlet valve, the inlet pipe and the pulsating effects. The inlet valve movement promotes moderate values of Mach numbers during its opening phase. After the inlet valve closes, the flow is abruptly restricted and a series of pressure waves propagate through the fluid at low Mach numbers. Although the low Mach number preconditioned density-based method is very attractive in this case, the study of the pulsating flow in the internal combustion engine intake systems has not been performed using this method, probably owing to robustness issues and simulation effort. The pressure-based methodology is widely used and, generally, the inlet pipe and pulsating effects are not included in the threedimensional fluid dynamics simulation. In order to verify the accuracy of the numerical solution, the results are compared with experimental data collected from a bench constructed specifically for this purpose. The numerical results were satisfactory for the amplitudes and the resonance frequencies in the air intake system. Also, different aspects of the jet flow inside the cylinder are shown and discussed.

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Analysis of Unsteady Flow Through a Throttle Valve Using CFD

Cited by 14 publications

References 6 publications

Application of flow field decomposition and reconstruction in studying and modeling the characteristics of a cartridge valve

Application of flow field decomposition and reconstruction in studying and modeling the characteristics of a cartridge valve

Wave dynamics measurement and characterization of a charge air cooler at the intake of an internal combustion engine with integration into a nonlinear code

Numerical study of an internal combustion engine intake process using a low Mach number preconditioned density-based method with experimental comparison

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