【作者】 王忠义；

【导师】 孙海鸥；

【作者基本信息】 哈尔滨工程大学 ， 轮机工程， 2010， 博士

【摘要】 船舶燃气轮机排气引射装置是既简单又高效的冷却设备,因而得到了越来越广泛的应用。不同船舶由于用途与结构上的差异对排气引射装置有不同的要求,因而出现了不同结构形式的排气引射装置。本文利用数值模拟与实验研究相结合的方法对某型船用燃气轮机排气引射装置进行研究。通过改变排气引射装置各主要结构参数对引射装置的性能进行研究,以期建立结构参数与引射性能间的变化规律,为排气引射装置的设计提供参考。本文主要进行了以下几个方面的工作:1.以某型船用燃气轮机排气引射装置为原型,建立严格符合物理边界的计算模型,并采用结构化网格对计算域进行网格划分,选用合理的湍流模型与离散方法,利用流体力学软件对计算模型进行数值模拟。2.利用多孔介质边界条件结合机舱进气滤清器阻力特性解决了不同工况下次流进气负压无法确定的技术难题,用压力阶跃的办法代替排气引射装置次流进口负压条件,减少了模型数值模拟过程中的计算量。3.考察引射装置主要结构参数的变化对装置引射性能的影响,通过系列模型的数值模拟,总结各主要结构参数与引射性能的变化规律,为排气引射装置的设计提供参考。4.利用相似定理研究排气引射装置的转换方法,实现了大尺度、高温实际模型向小尺度、低温实验模型的转换,保证在实验室条件下能够对排气引射装置进行性能实验研究。5.建立了实验室条件下排气引射装置的实验方案,确保能够对常规排气引射装置的引射性能进行实验研究。同时对某型排气引射装置进行了引射性能的实验研究,将实验结果与计算结果对比,吻合趋势良好。6.根据实际需要,设计了一种流量调节装置,可以实现对船用燃气轮机排气引射装置不同引射流量的调节控制,满足不同工况下引射性能的要求。更多还原

【Abstract】 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.更多还原