Effect of Cooling Fan Pressure Head on Flow Field Characteristics of Exhaust Ejector System of Marine Gas Turbine
In order to solve the problem of low cooling air intake of marine gas turbine under severe con-dition,the standard k-ω model was used to simulate the integrated exhaust ejector system of marine gas turbine and analyze the flow field characteristics and temperature distribution characteristics at the 0 Pa head under the baseline condition,on the basis of which,the effect of different fan pressure heads on the flow field characteristics of the exhaust ejector system after turning on the cooling fan was explored.The results show that the dimensionless outlet temperature is 0.515 0 under the baseline condition,while it is 0.509 9 at the 200 Pa head.Compared with the baseline condition,the case module cooling inlet mass flow rate increases with the increase of pressure step,which makes the temperature in the mixed pipe more uniform,the local high temperature zone smaller and the outlet temperature lower.Under the current study conditions,with the increase of the fan pressure head,the total mass entrainment and the total mass entrainment ratio of the exhaust ejector system also increase,reaching the maximum value at 1 500 Pa.Compared with the baseline condition,the total mass entrainment ratio increases by 17.2％;the total and static pressures of the nozzle inlet increase with the increase of the pressure head,and the outlet tempera-ture of the exhaust ejector system continues to decrease,and the dimensionless temperature decreases from 0.509 9 to 0.477 1 when the pressure step increases from 200 Pa to 1 500 Pa.
marine gas turbineexhaust ejector systemflow field characteristicsnumerical simulation
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