Comprehensive Performance And Rapid Prediction Technology Study Of The Marine Inertial Stage Gas-water Separator

Gas turbines are widely used in various fields such as power plant,ocean engineering,and aerospace due to their numerous advantages such as high-power density and good maneuverability.Under working conditions,a large amount of air is sucked into the engine.In marine environments,there are a large number of droplets floating in the air,which enter the engine flow channel under the suction of the engine,seriously damaging various components of the engine and affecting the service life of the gas turbine.To ensure the stable operation of marine gas turbines,the intake filter is generally installed at the front of the intake duct to filter out liquid droplets in the atmospheric environment.With the continuous development of ship technology,higher requirements have been put forward for the working performance,service life,and structural reliability of marine filtration systems in harsh marine environments.To further improve the comprehensive performance of the intake filtration system,the inertial separator is taken as the research object,and extensive research were conducted on the comprehensive performance of the intake filtration system from three aspects: technical performance,service life,and structural reliability,respectively,by using a combination of numerical simulation and experimental research method.Firstly,the technical performance of the inertial separator includes two aspects: aerodynamic resistance and separation efficiency.To deeply study the technical performance of the inertial separator,several different blade types of aerodynamic performance and separation experiments were first conducted.Subsequently,many numerical simulation studies were conducted on the aerodynamic resistance and separation efficiency of the inertial stage blades.Secondly,relevant research was conducted on the corrosion resistance and service life of the inertial separator blade surface,and an anodized/silane composite coating was prepared.The advantages of the proposed coating in terms of corrosion resistance were clarified,and further research was conducted on the influence of surface roughness of the coating on the performance of the inertial stage.Finally,experimental and numerical simulation studies were carried out on the strain pattern and structural reliability of the inertial separator under drop and impact environments.The main research work of this article is as follows:Firstly,experimental research was conducted on the technical performance indicators of the inertial stage gas-water separator,including aerodynamic resistance and separation characteristics.The aerodynamic performance and separation characteristics of three blade types were measured under different inflow conditions,and the inlet particle size results were obtained under different inflow conditions.The cumulative mass fraction and Rosin Rammler distribution function were used for fitting,laying the foundation for subsequent research work.Secondly,a numerical simulation plan for the aerodynamic performance of the inertial separator was developed,and the effectiveness of the numerical simulation method was verified by comparing with the corresponding experimental results.On this basis,the influence of main structural parameters such as plate spacing,turning intercept,groove depth,and groove width on their aerodynamic resistance characteristics was further analyzed.Results show that the plate spacing and groove depth were negatively correlated with total pressure loss,while the turning intercept and groove width were positively correlated with total pressure loss.Furthermore,a rapid prediction model between the structural parameters of the inertial stage,inlet velocity,and aerodynamic performance was established using orthogonal regression experiments.The effectiveness of the established fast prediction model was verified by comparing with experimental data.Then,based on the discrete phase model and the random walk model,coupled with the self-developed simulation model of droplet collision and motion law with the wall,the numerical simulation method of the separation efficiency of the inertial separator was established.Combined with the droplet distribution law at the inlet of the inertial stage obtained from the experiment,the droplet motion characteristics in the inertial separator channel were accurately predicted.Results indicate that the high-speed zone inside the inertial stage has a significant impact on separation efficiency.Compared with typical inertial stages,the new inertial stage has a continuous high-speed zone,which improves the separation efficiency for large particle droplets but also reduces the separation efficiency for small particle droplets 4μm to 6 μm.Once again,research was conducted on the surface corrosion resistance of inertial stage in marine environments.The dual layer silane coating composite technology is used to seal the gaps on the traditional anodized surface to improve the performance of the coating.The corrosion resistance of the prepared double-layer silane coating was analyzed and studied through salt spray experiments,potentiodynamic polarization curve testing,and electrochemical noise technology.Results show that the anodic oxidation/silanization coating can effectively improve the corrosion resistance of aluminum alloys,reduce the self corrosion current density by an order of magnitude,and also effectively reduce the pitting sensitivity of aluminum alloys.Further investigate the impact of coating surface roughness on its technical performance.Finally,study on the structural strength reliability of marine inertial separators under drop and impact conditions was carried out.A combination of numerical simulation and experiments was used to study the strength of inertial stage structures under different drop conditions and multi angle impact conditions.Results show that the longitudinal drop strain have little impact on the inertia level,and the transverse drop strain is 10 times smaller than the longitudinal strain of the blade,and have little impact on the inertia level;In the impact experiment,the weakest angle of the inertia stage is 0-0 angle,and as the detonation height increases,the deformation decreases.Blade support can effectively reduce the deformation caused by impact.