Study On The Performance Of Ship Gas-water Separator

Gas turbine has a high requirement for its intake quality,and the impurities in the air will not only cause the decline of gas turbine power,but also damage the components.Marine gas turbines operate in harsh marine atmospheric environment.In order to ensure the intake quality,it is necessary to use the filter device to filter out impurities such as solid particles and salt fog aerosols in the marine atmosphere.Inertial air-water separators are often installed in marine inlets to filter impurities such as fine droplets and salt fog aerosols in the air flow.In this paper,based on the blade profile of the traditional inertial wave plate,the streamline structure of the inertial wave plate is optimized according to the resistance characteristics.Numerical simulation and experimental verification were combined to study the aerodynamic and separation performance.The main research contents of this paper are as follows:1.Orthogonal experimental design with different levels of numerical simulation factors was carried out for the traditional inertial wave plate with existing experimental data.The appropriate pressure-velocity coupling algorithm,turbulence model,pressure interpolation scheme and discrete scheme were selected to study at different levels.Considering the interaction between the factors,the numerical simulation results were compared with the experimental results,and the factor level combination of the best numerical simulation scheme was obtained.The average error between the numerical simulation scheme and the experimental results was 5.70 %,which laid the foundation for the numerical simulation of streamlined inertial wave plate.2.The streamline optimization of the traditional inertial stage blade is carried out to obtain the streamline inertial stage blade structure.The characteristics and laws of the internal flow field are studied by the method of the optimal numerical simulation scheme;The streamline inertial stage separators with different blade spacings were studied in detail,and the blade spacing of the minimum blade resistance of the streamline inertial stage was obtained.The dimensionless spacing of the minimum resistance was 0.37 by dimensionless the blade parameters.3.The Euler-Lagrangian method is used to study the two-phase separation flow in the inertial wave plate.The effects of particle size and inlet velocity on separation efficiency were investigated.For the inertial wave plate efficiency with different blade spacings,the Rosin-Rammler distribution that conforms to the actual particle size distribution is used to study it.On this basis,the Eulerian wall film model is used to study the distribution of liquid film on the inertial wave plate,and it is obtained that the liquid film is concentrated on the wave wall at the front end of the flume.4.Using 3D printing technology to make the flange of streamlined inertia wave plate test piece,and test the performance of each test piece.The resistance characteristics of inertial wave plate gas-water separator with different blade spacing were measured under different ambient pressure and temperature.The experimental results were normalized to verify the accuracy and predictability of numerical simulation.The influence of droplet evaporation in air on particle size was calculated by a self-compiled program,and based on this,PDA was used to measure the aerosol droplet spectrum characteristics at the inlet and outlet of two inertial stage blades for evaluating the separation efficiency.In this paper,the optimal numerical simulation scheme of the inertial wave plate gas-water separator is obtained by combining the experimental data with the orthogonal test method with interaction.Based on this scheme,the streamlined inertial stage blade after streamline optimization is calculated,and the dimensionless spacing of the minimum resistance is obtained.The factors affecting the separation efficiency are analyzed.On this basis,the streamlined inertial wave plate test pieces are made for performance test,and the numerical simulation results are verified.The verification shows that the comprehensive performance of streamlined blade is significantly improved compared with that of traditional inertial stage blade separator,and a low resistance and high efficiency inertial stage blade structure is obtained.