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Rotating instability in the vaneless diffuser of a radial flow pump

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Journal of Thermal Science 2008年第4期17卷 368-374页

作者： A.Dazin O.Coutier-delgosha P.Dupont S.Coudert G.Caignaert G.Bois Laboratoire de Mécanique de lille(UMR CNRS 8107) Arts et Métiers ParisTech Laboratoire de Mécanique de lille Ecole Centrale de Lille Laboratoire de Mécanique de lille CNRS

The paper refers to the behavior of a vaneless diffuser of a radial flow pump in partial flow operating conditions. Some experimental data have been obtained using 2D/2C PIV and unsteady pressure measurements within the diffuser, in various operating conditions. The experimental results at the lower flow rate are compared with two-dimensional numerical calculations.

关键词： Vaneless diffuser Radial flow pump Instability Particle Image Velocimetry Pressure measurements 2D calculations.

Characterization of Tunisian marine sediments in Rades and Gabes harbors

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International Journal of Sediment Research 2014年第3期29卷 391-401页

作者： Imen BEL HADJ ALI Zoubeir LAFHAJ Mounir BOUASSIDA Imen SAID ecole centrale de lille Villeneuve d'AscqFrance and Ecole Nationale d'Ingenieurs de TunisTunisia ecole centrale de lille Villeneuve d'AscqFrance Universite de Tunis El Manar/ecole Nationale d'Ingenieurs de Tunis/05-UR-11 06 Universite de Tunis El Manar/ecole Nationale d'Ingenieurs de Tunis/05-UR-1106

The objective of this article is to study the geotechnical and environmental characteristics of sediments dredged from two Tunisian harbors:Rades and *** first harbor represents the main facility place in the national transport *** second one is selected as its sediments present a serious ecological constraint caused by the discharge of wastes into the marine *** sediments are either discarded at sea or landfilled despite their harmful effects on the *** article is divided into three main *** first one presents the material that was carried for Rades and Gabes *** conservation conditions and the used experimental tests are *** characterization includes the determination of the grain size distribution,the water content,the Atterberg limits,the methylene blue value,the specific area,the bulk density,the specific unit weight,the organic and carbonate *** characterization is assessed by the determination of metals concentrations in a leaching *** second section deals with the description and analysis of geotechnical properties of Rades and Gabes harbors’ *** results obtained show that Rades harbor sediments are slightly sandy clayey silts whereas Gabes harbor sediments are silty sands characterized by a highly plastic clay *** of the two sediments don’t exhibit a high organic ***,chemical,mineralogical and environmental properties are presented and then *** experimental results obtained show that Rades and Gabes sediments could be used as a sand substitute in the formulation of a new construction *** harbor sediments are more polluted than Rades harbor sediments.

关键词： Sediments Characterization Geotechnical Environmental Valorization

Multimodel Approach for Intelligent Control and Applications

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Journal of Donghua University(English Edition) 2004年第3期21卷 15-20页

作者： Abdelkader El Kamel Pierre Borne ecole centrale de lille LAIL BP: 48 F59651 Villeneuve d' Ascq Cedex FranceEcole Centrale de Lille LAIL BP: 48 F59651 Villeneuve d' Ascq Cedex France

The use of the multimodel approach in the modelling, analysis and control of non-linear complex and/or ill-defined systems was advocated by many researchers. This approach supposes the definition of a set of local models valid in a given region or domain. Different strategies exist in the literature and are generally based on a partitioning of the non-linear system’s full range of operation into multiple smaller operating regimes each of which is associated with a locally valid model or controller. However, most of these strategies, which suppose the determination of these local models as well as their validity domain, remain arbitrary and are generally fixed thanks to a certain a priori knowledge of the system whatever its order. Recently, we have proposed a new approach to derive a multimodel basis which allows us to limit the number of models in the basis to almost four models. Meanwhile, the transition problem between the different models, which may use either a simple commutation or a fusion technique, remains still arise. In this plenary talk, a fuzzy fusion technique is presented and has the following main advantages: （1） use of a fuzzy partitioning in order to determine the validity of each model which enhances the robustness of the solution; 2 introduction, besides the four extreme models, of another model, called average model, determined as an average of the boundary models.

关键词： multimodel fuzzy fusion average model

Function projective lag synchronization of fractional-order chaotic systems

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Chinese Physics B 2014年第4期23卷 171-177页

作者：王莎于永光王虎 Ahmed Rahmani department of Mathematics Beijing Jiaotong University LAGIS UMR 8219 CNRS Ecole Centrale de Lille 59651 Villeneuve d’Ascq France

Function projective lag synchronization of different structural fractional-order chaotic systems is investigated. It is shown that the slave system can be synchronized with the past states of the driver up to a scaling function matrix. According to the stability theorem of linear fractional-order systems, a nonlinear fractional-order controller is designed for the synchronization of systems with the same and different dimensions. Especially, for two different dimensional systems, the synchronization is achieved in both reduced and increased dimensions. Three kinds of numerical examples are presented to illustrate the effectiveness of the scheme.

关键词： fractional order chaos function projective lag synchronization

Considering functional dimensioning in architectural design

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Frontiers of Architectural Research 2017年第1期6卷 89-95页

作者： Jean-Joseph Savoini Zoubeir Lafhaj Mechanic and Civil Engineering Ecole Centrale de Lille Villeneuve d'Ascq 59651 France

This paper presents an overview of the functional dimensioning （FD） concept apptied to the construction sector. FD addresses the issue of toterance; construction involves severat trades working together white each trade has its own construction toterances. To investigate this probtem, three case studies are investigated. The first one describes a classic case of a window in a bay and the way constructors sotved the resulting toterance problems. The second case study describes the notion of chain dimension. The fast case study presents the notion of wedge as a sotution to sotve probtems related to toterance gap accumulation. This paper is of interest to the scientific community that is working to industrialize the construction sector and atso to architects （in the design）, construction managers （onsfte）, and manufacturers （construction trades）.

关键词： Tolerance Architecture Construction Dimensioning Quotation

Blockage and distortion effects on a vane-island type diffuser performance of centrifugal pumps for various flow rates

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排灌机械工程学报 2016年第12期34卷 1013-1021页

作者： SI Qiaorui DAZIN Antoine DUPONT Patrick ROUSSETTE Olivier BOIS Gérard National Research Center of Pumps Jiangsu University Laboratoire de Mécanique de lille (UMR CNRS 8107) Arts et Métiers ParisTech Laboratoire de Mécanique de lille(UMR CNRS 8107) Ecole Centrale de Lille

Experimental investigation of mean flow velocity and pressure inside the vane-island type diffuser passage of a test centrifugal pump model is presented.A directional three-hole probe was used to investigate hub-to-shroud flow properties at diffuser leading and trailing edge *** addition,the mid-section between suction and pressure sides along the diffuser passage was also *** these measurements were performed at five different flow *** flow structures at the inlet section of the diffuser and along with the passage were analyzed in detail,with a focus on the flow distribution and the pressure recovery evolution of different diffuser *** and distortion effects were analyzed by using existing published particle image velocimetry(PIV)measurements in the outer part of the impeller and around the diffuser throat in order to get a better understanding of the overall performances and local flow structures of such a diffuser *** results show that back flows occur on the shroud region from impeller exit plane up to the semi-vaneless part of the diffuser at low flow *** blockage effects combining with blade thickness geometrical blockage tend to diminish the effects of theoretical high positive *** high flow rates,negative incidence effects induce high local velocity on the pressure side of the diffuser just after the *** aerodynamic blockage associated with low flow distortions are found to have a beneficial effect on pressure recovery for low flow *** the contrary,high flow distortions are found for increased flow rates,resulting in a low pressure recovery inside the semi-vane less part of the diffuser and after the throat.

关键词： vane island diffuser flow structure pressure recovery three-hole probe particle image velocimetry

Data-driven prediction of plate velocities and plate deformation of explosive reactive armor

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defence Technology（防务技术） 2022年第12期18卷 2141-2149页

作者： Marvin Becker Andreas Klavzar Thomas Wolf Melissa Renck Institute of Saint-Louis 5 Rue du Général Cassagnou68330Saint LouisCedexFrance ecole centrale de lille CitéScientifique59651Villeneuve d'AscqCedexFrance

Explosive reactive armor(ERA)is currently being actively developed as a protective system for mobile devices against ballistic threats such as kinetic energy penetrators and shaped-charge *** mobility,the aim is to design a protection system with a minimal amount of required *** efficiency of an ERA is sensitive to the impact position and the timing of the ***,different designs have to be tested for several impact scenarios to identify the best *** analytical models are not predicting the behavior of the ERA accurately enough and experiments,as well as numerical simulations,are too time-consuming,a data-driven model to estimate the displacements and deformation of plates of an ERA system is proposed *** ground truth for the artificial neural network(ANN)is numerical simulation results that are validated with *** ANN approximates the plate positions for different materials,plate sizes,and detonation point positions with sufficient accuracy in *** a future investigation,the results from the model can be used to estimate the interaction of the ERA with a given ***,a measure for the effectiveness of an ERA can be ***,an optimal ERA can be designed and analyzed for any possible impact scenario in negligible time.

关键词： Artificial neural network Explosive reactive armor Finite element simulation Particle simulation Flash X-ray

Comparisons between numerical calculations and measurements in vaned diffuser of SHF impeller

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排灌机械工程学报 2013年第12期31卷 1013-1020页

作者： Annie-Claude Bayeul-Lainé Patrick Dupont Giovanna Cavazzini Patrick Cherdieu Antoine Dazin Gérard Bois Olivier Roussette Laboratoire de Mécanique de lille(UMR CNRS 8107) Arts et Métiers ParisTech Laboratoire de Mécanique de lille(UMR CNRS 8107) Ecole Centrale de LilleVilleneuve D'Ascq Cedex 59651France department of Industrial Engineering University of Padova

The paper presents analysis of the performance and the internal flow behaviour in the vaned diffuser of a radial flow pump using PIV(particle image velocimetry)and pressure probe *** measurements have already been performed at middle height inside one diffuser channel passage for a given speed of rotation and various mass flow *** results have been already presented in several previous *** experiments have been performed using a three-hole pressure probe traverses from hub to shroud diffuser width at different radial locations between the two diffuser geometrical *** simulations are also realized with the commercial codes Star CCM+7.02.011 and *** rotor and fully unsteady calculations of the whole pump have been *** between numerical results,previous experimental PIV results and new probe traverses one's are presented and discussed for one mass flow *** this respect,a first attempt to take into account fluid leakages between the rotating and fixed part of the pump has been checked since it may affects the real flow structure inside the diffuser.

关键词： vaned diffuser radial flow pump unsteady flow numerical calculations particle image velocimetry(PIV) three-hole probe

Distributed Adaptive Time-Varying Formation Tracking for Linear Multi-Agent Systems:A Dynamic Output Approach 36

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Distributed Adaptive Time-Varying Formation Tracking for Lin...