Performance Study Of Cyclone Stage In The High Efficient Filter

Because of the advantages of high efficiency, great power, small volume, lightness, good flexibility and so on, marine gas turbine has become the main power plant of large and middle sized marine warship. Marine gas turbine uses air as working medium. The air in the marine environment always sustains large numbers of salt particles, smear and sand-dust, which will harm the gas turbine. In order to ensure the performance and reliability of the marine gas turbine, most naval ships use the filter system. So investigating the mechanism of the air-intake filter installation in the gas turbine by using numerical simulation method and experimental method has important realistic significance of providing relative reference to the design and manufacture of the marine air-intake filter installation.In this article, the object of study is a cyclone stage which is combined by some serial cyclone separators. As the first stage of the combinational filter with high efficiency, cyclone stage can mitigate wave impact to the back stage of the filter; fleetly drain off the water and separate large diameter droplet. It is one of the most important parts of the combinational filter. Two main characteristics of the cyclone separator are the resistance and the separation efficiency. In this article, using the method of combining numerical simulation with experimental research to investigate the cyclone separator, some works have been done as followed:Firstly, applying structural grid to simulate the original model of cyclone separate, studying its resistance characteristic, analyzing the distributing situation of the inner flow field in the cyclone separator; and making relative design to reduce the resistance. Through installing diffuser on the gas outlet of the cyclone separator to reach the purpose of reducing the resistance;Secondly, applying unstructured grid to simulate the antetype model and the modified model of the cyclone separator; comparing with the results of structural grid model and making relevant analysis. The results show that, the numerical simulation results of two different grids are nearly the same for the cyclone separator;Thirdly, considering the actual condition of the cyclone stage, applying the periodicity boundary condition to investigate the antetype and the modified model of the cyclone separator by using single-phase numerical simulation method, then simulating two-phase flow field. The results of two-phase flow field simulation indicate that the effect of catching big granules is better for the cyclone separator;Finally, using pint-sized wind tunnel to carry out resistance experiment and efficiency experiment of the cyclone separator in order to validate the numerical simulation results. The resistance experimentalize is easily achieved, and the results validate the veracity of the numerical simulation results of resisitance characteristics; For the efficiency experiment, by dint of additive equipments to form combined filter, then obtain the separate efficiency characteristics of the system.