An analysis of the exhaust diffuser section of a gas turbine is presented by incorporating the reduced order mathematical model "actuator disc concept" that represents the last stage of the turbine. The actuator disc model is one of the simplified numerical methods for analyzing the aerodynamic performance of axial turbine stage. In which, the rotor and the stator of the turbine stages are modeled as zero thickness discs with a specified blade speed and zero speed respectively. Finite volume based commercial CFD package ANSYS FLUENT was employed for the numerical investigation of the applicability of the proposed simplified model. The compressible Navier-Stoke equations along with k- turbulent model were solved in the computational domain by incorporating suitable boundary conditions. The implementation of actuator disc boundary conditions is described in detail. The numerical results obtained from the proposed model are in good agreement with the experimental data available in the literature. The effect of casing angle on the performance of diffuser is presented.
Thermal conductivities A of ethylene and propane were measured in the temperature and pressure ranges 400-750 K and 0.1-2.65 MPa (ethylene) and 400-725 K and 0.1 to 0.6 MPa (propane). The data were correlated by expressions of the form 11.= Ao(T) X Ap(P), with 11.0 being a second order polynomial in temperature and Ap a third (ethylene) or a fourth (propane) order polynomial in pressure. The results obtained were compared with previous thermal conductivity measurements.
Karinna Vernaza joined Gannon University in 2003, and she is currently an Associate Professor in the Mechanical Engineering Department. She earned her Ph.D. and M.S. in mechanical engineering from the University of Notre Dame. Her B.S. is in marine systems engineering from the U.S. Merchant Marine Academy. Her primary teaching responsibilities are in the solid mechanics and materials areas. She was awarded the 2012 ASEE NCS Outstanding Teacher Award. Vernaza consults for GE Transportation and does research in the aread of alternative fuels (biodiesel), engineering education (active learning techniques), and high strain deformation of materials. She is currently a Co-PI in an NSF S-STEM and ADVANCE-PAID grants. She is actively involved in outreach activities that introduce middle school students to engineering.
She joined Gannon University in 2003 and is very interested in instructional innovation with technology. Mahesh Aggarwal, Gannon University Mahesh Aggarwal earned his Ph.D. from the University of Michigan and joined Gannon University in 1978. Dr. Aggarwal is Chair and Professor of Mechanical Engineering. He has published numerous papers and has received numerous patents. He is actively involved in international programs.
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