The Research On The Performance Of The Marine Gas Turbine Exhaust Injection

Marine gas turbine exhaust injector is used widely as a simply and highly efficient device for cooling equipment. Ship has different requests for the exhaust injector according to the different purposes and structures, there are many kinds of exhaust injectors with different structures.In the thesis, a given marine gas turbine exhaust injcetor has been simulated numerically with corresponding experimental study conducted. The research about the performance of the exhaust injector has been done by changing the leading structure parameter. The purpose of the research is to find the rule between the structure parameter and the ejector performance, and it can offer the reference for the further design of the exhaust injector. The following works had been done in this paper:1. Take the given marine gas turbine exhaust injector as an original model, and the computable model which accords with the physical model has been established. The mathematics model has been divided by using the structured grid and the numerical simulation have been done by using the logical turbulent models and disperse method in the computational fluid dynamics software.2. The inlet negative pressure of the second air is a difficult problem to confirm. The conundrum is solved by combining the porous boundary condition with the resistance performance of the engine room inlet air filter. The pressure jump method has been used to substitute for the inlet negative pressure of the second air thus reduces the workload of the numerical simulation.3. The effect of the equipment ejector performance brought by the changes of the leading structure parameter has been studied. A series of models have been simulated in order to get the rule between the structure parameter and the ejector performance. The research result can offer a valuable reference for the further design.4. The transform method of exhaust injector has been researched by similar theorem, in order to convert the model from big size, high temperature fettle to small size and low temperature fettle. It is possible that the experimental study of the exhaust injector can be done in the laboratory condition.5. The experimental scheme about the exhaust injector in the laboratory condition has been constituted and the ejector performance of the normal exhaust injector can be researched by experimental method. At the same time, the experimental research of a given exhaust injector has been done. The superpose degree of current by contrasting the experimental result with the simulated the result is good.6. A kind of flow rate controller has been designed base on the actual requirement. It can control the flow rate of the ejector under the different work state of the marine gas turbine exhaust injector and acclimatize oneself to the different ejector efficiency.