Universidad de Concepción Facultad de Ingeniería

PERSONAL

Rodríguez Godoy Cristian Gabriel

Información de Contacto

  • 56 41 220 4732
  • Oficina 322 Edificio Central Facultad de Ingeniería

Sobre Rodríguez Godoy Cristian Gabriel

Ingeniero Civil Mecánico - UDEC 

Doctor en Fluidos, Turbomáquinas y Potencia Fluida. Universitat Politècnica de Catalunya, España.

http://www2.udec.cl/~crrodrig/cv.html

Proyectos

2010 Proyecto de Investigacion Industrial

Prof. Cristian Rodríguez (Investigador Responsable)
Proyecto de Investigación para el desarrollo de una estrategia para la predicción de operación Clasificadores Cavex ®, Weir Minerals Latin America

2007 Fondecyt 11070109

Prof. Cristian Rodríguez (Investigador Responsable)
Added mass effects and natural frequencies reductions in Francis turbine runners (Link Conicyt)

2003 Fondecyt 1030323

Prof. Pedro Saavedra (Investigador Responsable)
Prof. Cristian Rodríguez (Tesista)
Nuevas técnicas de mantenimiento predictivo mediante análisis de vibraciones aplicadas a máquinas críticas de la minería.
(Link Conicyt)

Publicaciones

Transition from spray to roping in hydrocyclones. (2018), Although roping in hydrocyclones is a problem that has been studied by many researchers, we do not yet have a theory that relates all the variables involved. Several experimental works with different approaches such as mechanical energy balance, work on hydrocyclones with water only and hydrocyclone air core measurements with different instruments in the laboratory and plant have attempted to explain the roping phenomenon. They have addressed design variables such as apex to vortex diameters and different cone angles as well as operating variables such as inlet solid concentration, particle size, pressure and overflow and underflow flow rates and concentrations in order to understand their effect on the roping condition. In this paper we intend to verify some of the conclusions of these studies and establish inlet pressure and particle diameter as the variables that, in combination, lead from spray to roping. We present a computational model using Computational Fluid Dynamics (CFD) to study a 75-mm laboratory hydrocyclone operating at a variable flow rate and with three different particle diameters. The Reynolds Stress Model and Eulerian multiphase model were used to model the turbulence and interaction of phases, respectively. The solid particles are described with the kinetic theory of granular flows (KTGF). Physical coherence and accuracy were compared with experimental data, where errors are within the expected range for an engineering prediction. The results indicate that transition from spray to roping generates an increase in the inlet flow pressure and/or particle diameter at a constant solid concentration in the feed flow. For 20-µm-diameter particles an increase results in a decrease in the discharge angle, although it always has a spray shape, for 34-µm diameters increasing the inlet pressure generates a semi-rope discharge and for 70-µm-diameter particles a small increase in the inlet pressure generates a roping condition. Transition to roping is characterized by a decrease in the air core diameter and discharge angle due to slow rotational velocity when particle diameter increases or higher accumulation of the solid fraction in the apex when inlet pressure increases. The passage from spray to roping occurs with a change in the frequency spectrum of the pressure oscillations in the walls of the hydrocyclone, with high amplitudes at low frequencies for spray discharge and noisy signals in all spectrums and damped low frequencies for roping. https://doi.org/10.1016/j.mineng.2018.04.008

Respuesta de un harnero vibratorio ante la perdida de rigidez en los apoyos (2016), Ingeniare. Revista Chilena de Ingeniería. Vol. 24 N° Especial 2016, pp. 25-31

Non-Linear Model of Vibrating Screen to Determine Permissible Spring Deterioration for Proper Separation (2016), Shock and Vibration, In Press

Condition monitoring of Pump-turbines. New challenges (2015), Journal of the International Measurement Confederation, Volume 67, May 2015, pp. 151-163

Monitoring of rotor-stator interaction in pump-turbine using vibrations measured with on-board sensors rotating with shaft (2014), Shock and Vibration 24 (2014), 1-8, Article ID 276796

Failure investigation of a large pump-turbine runner (2012), Engineering Failure Analysis 23, 27-34

Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces (2012), Computers & Fluids, 35, 117-126

Numerical Simulation of Fluid Added Mass Effect on a Francis Turbine Runner (2007), Computers & Fluids 36, 1106-1118

Frequencies in the Vibration Induced by the Rotor Stator Interaction in a Centrifugal Pump-Turbine (2007), ASME Journal of Fluids Engineering 129, 1428-1435

Experimental Investigation of Added Mass Effects on a Francis Turbine Runner in Still Water (2006), Journal of Fluids and Structures 22, 699-712

Accurate assesment of computed order tracking (2006), Shock and Vibration, 13, 13-32

Conferencias

Modelo de Vibraciones Debidas a la Interacción Rotor-Estator en Turbomáquinas Radiales con Rodete Excéntrico. C. Junge, F. LEaman, C.G. Rodríguez. COCIM 2012, XV Congreso Chileno de Ingeniería Mecánica. La Serena. 2012

Características Frecuenciales de la Interacción Rotor-Estator en una Turbina-Bomba con Combinación de Álabes 7/16. F. Leaman, C. G. Rodríguez, E. Egusquiza. COCIM 2012, XV Congreso Chileno de Ingeniería Mecánica. La Serena. 2012

Análisis de las Vibraciones Debidas a la Interacción Rotor-Estator en Turbomáquinas Radiales. C. Junge, C.G. Rodríguez. COCIM 2012, XV Congreso Chileno de Ingeniería Mecánica. La Serena. 2012

Obtención experimental de las frecuencias naturales de objetos sumergidos en agua. F. Pierart, C.G. Rodríguez, R. Contzen. XIV Congreso Chileno de Ingeniería Mecánica COCIM. Pucón. 2010

Experimental Modal Analysis in Submerged Cantilever Plate with Nearby Rigid Wall. C.G. Rodríguez, F.G. Pierart, E. Egusquiza. International Conference on Noise and Vibration Engineering ISMA2010. Leuven. 2010

Simulación de Vibraciones en Placa Sumergida en Agua, Influencia de una Superficie Libre. C.G. Rodríguez, L.R. Contzen y J.A. Rojo. VIII Jornada de Mecánica Computacional. Pucón. 2009

Vibraciones de una Placa Sumergida en Agua. C.G. Rodríguez, L.R. Contzen y J.A. Rojo. XIII Congreso Chileno de Ingeniería Mecánica COCIM. Arica. 2008

Modelación Numérica Para Evaluar la Integridad Estructural de Pilotes de Hormigón. Francisco Molina, Fernando Cerda y Cristian Rodríguez. VI Jornada de Mecánica Computacional. Santiago. 2007

Modal Response of Hydraulic Turbine Runners. Q.W. Liang, C.G. Rodríguez, E. Egusquiza, X. Escaler, F. Avellan. 23th IAHR Symposium on Hydraulic Machinery and Systems. Yokohama. 2006

Feasibility of On-Board Measurements in Hydraulic Turbines. C. G. Rodríguez, E. Egusquiza, X. Escaler, Q. W. Liang. 23th IAHR Symposium on Hydraulic Machinery and Systems. Yokohama. 2006

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