Sharif Digital Repository

Steam Injection is one of the most effective methods to improve performance and emission reduction of a gas turbine engine. In this study, the effect of using steam injection on the performance of a mechanical drive gas turbine engine is simulated and power output, thermal efficiency, compressor surge margin, velocity field in axial turbine and turbine isentropic efficiency are examined. In the two-shaft configuration, turbine inlet temperature and gas generator spool speed are the two parameters limiting the output power. On the other hand, matching of compressor turbine and power turbine is an important task that affects the performance of engine under steam injection condition. Based on... 

In the present thesis, a high-order compact finite-difference lattice Boltzmann method (CFDLBM) is proposed and applied for an accurate and efficient numerical simulation of liquid-vapor two-phase flows. At first, the stability of the fourth-order CFDLBM is performed by using the von Neumann stability analysis for the D2Q7 and D2Q9 lattices. The stability analysis indicates that the CFDLBM proposed is stable and thus suitable for the simulation of high Reynolds number flows. The high-order CFDLBM is then developed and applied to accurately compute 2-D and 3-D incompressible flows in the Cartesian coordinates. Herein, the spatial derivatives in the lattice Boltzmann equation are discretized...