Browsing by Author "Sahnoune, Khaled"

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    Contribution à l'étude d'une turbine axiale hydraulique par une approche multi-physiques
    (Universite M'Hamed Bougara : Faculté des hydrocarbures et de la chimie, 2021) Sahnoune, Khaled; Benbrik, Abderrahmane(Directeur de thèse)
    Ce travail est une étude multidisciplinaire d’une turbine hydraulique axiale, utilisée dans le domaine de forage de puits des hydrocarbures. Afin d’avoir une meilleure caractérisation des performances de ce type d’équipement, on s’appuie sur une approche multi-physique qui fait participer plusieurs domaines de la mécanique notamment la mécanique des fluides, la mécanique des structures et leurs interactions communes. Pour réussir notre tâche de recherche, on utilise le programme de simulation : « ANSYS MULTI-PHYSICS ». Afin de valider notre approche, on effectue une comparaison entre nos résultats numériques et les résultats expérimentaux, d’un modèle spécifique de turbine de forage. Il a été démontré que le débit et la masse volumique ont une influence très importante sur le fonctionnement de ces machines, Par contre, l'effet de la viscosité est peu significatif. Les conditions opératoires ont des effets faibles sur l’intensité des contraintes sur les aubes de la turboforeuse, qui restent dominé par la pression de la boue de forage
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    Flow simulation and performance analysis of a drilling turbine
    (the Academic Publication Council of Kuwait University, 2020) Sahnoune, Khaled; Benbrik, Abderahmane; Mansour, Ahmed Saeed Mohamed; Rekik, Oussama
    Turbodrills are axial hydraulic turbines which are used in drilling hydrocarbons in extreme conditions, possessing advantages over other drilling techniques with their high speed of rotation, and higher operating torques. In The present work, a numerical simulation of a Newtonian Drilling Mud flow was carried out through one stage of this turbine that has a stator and a rotor. The steady state mixing plane model was used for the simulations to take the rotation of the rotor into account besides the spatially averaged property fluxes of the flow. The turbulence K-ε model was used to consider the turbulence effects. Key performance parameters are calculated as a function of rotation speed and they are validated against the experimental data of the same model geometry in real operating conditions, a good agreement have been found between manufacturer power and torque data, and our simulation results for the same variables. Various flow fields are presented such as velocity and pressure, which had a great influence on the performance of the studied turbine. This will lead to choose the best parameters configuration of an optimal field operation.
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    Influence of the flow characteristics and mud physical properties on the Perfor-mance of a drilling turbine
    (2021) Sahnoune, Khaled; Benbrik, Abderrahmane; Mansour, Ahmed S.; Moderres, Mourad
    For turbo drilling machine operations, several types of drilling mud can be used. The major factors influencing the choice of drilling fluid are: Cost, ecological impact, and the technical performance of the machine. Water-based drilling mud is widely used in drilling turbines. It consists of freshwater with additives such as sand. These added materials will influence the properties of the mud, increasing the density, and changing the rheological properties. In this present work, the influence of the physical properties of the drilling mud (density, viscosity), and flow conditions (mass flow rate) on the performance and flow characteristics of a specified turbodrill Model is investigated. For this purpose, the computational fluid dynamics approach was used to simulate the flow inside one stage of the considered turbine. Various values of mass flow rate, density, and viscosity were tested. A very good agreement was found between the experimental measurements of the manufacturer and the current simulation results for the performance curves
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    Volumetric gas radiation effects on double-diffusive mixed convection
    (Publisher Logo Conference Proceedings, 2020) Benbrik, Abderrahmane; Cherifi, Mohammed; Sahnoune, Khaled; Laouar-Meftah, Siham; Moderres, Mourad
    This work is devoted to studying the effect of volumetric gas radiation on mixed double-diffusive convection in a lid-driven square cavity. The vertical walls are maintained at different uniform temperatures and concentration gradients in cooperating flow. The horizontal walls are thermally insulated and impermeable to mass transfer. All the walls are assumed to be opaque, diffuse and gray. The top wall moves to the right side at a constant velocity. The cavity is filled with gray gas mixture considered as an absorbing, emitting and not scattering medium. The governing flow equations are solved by a finite volume method. The radiative transfer equation is modeled by discrete ordinates method. Results were presented in the form of isotherms, iso-concentrations, velocity profiles and heat and mass transfer for various values of Richardson number (Ri), Buoyancy ration (N) and optical thickness