Numerical Simulation On Controllable Exhaust Ejector Of Marine Gas Turbine

Marine gas turbine exhaust ejector is used widely as a simply and highly efficient device for cooling equipment. Ship has different requests for the exhaust ejector according to the different purposes and structures, there are many kinds of exhaust ejectors with different structures.In the thesis, a gas turbine exhaust ejector device of a given marine has been researched into by numerical simulation method. With parameter changed, the former single-stage ejector evolving into a two-stage ejector, the performance of this device thus improved. The paper has found the rules between the opening position of control configuration and ejector performance with the help of numerical simulation on the improved model. Finally, the flux of the ejected beam and the temperature of the outlet are under control. The following work has been done in this paper:1,Taking the given marine gas turbine exhaust ejector as an original model, the computable model which accords with the physical model has been established. The mathematics model has been divided by using the Hex grid, and the numerical simulation has been done by using the logical turbulent models and dispersing method in the CFD software.2,The inlet air filter's resistance performance of engine room has been simulated under the two different interior boundary conditions, that is, the Fan model and the Porous Jump model, and the comparison between the two models was made. The proper boundary condition is selected by comparison.3,All the factors such as the ejecting flux, ejecting coefficient, velocity field; total pressure field and temperature field of the original ejector have been taken into consideration, and an improved model has been constructed.4,Through a series of numerical simulation on the new model, this paper summarizes the impacts which the opening position of each control mechanical has made on the changing pattern of ejector performance, It is possible that the study will offer some reference for the control method of the new exhaust ejector.