Research on pressure pulsation characteristics in the annular cavity during the launch of a vehicle
During the vertical launch process of underwater vehicles,a problem that when the high-pressure chamber of the launch system is connected to the sealed annular cavity,causing high-pressure gas to surge into the cavity and generate pressure pulsations arises.In this study,the finite element simulation method was used to analyze this problem and investig-ate the effects of factors such as launch pressure in the high-pressure chamber,length of the annular cavity,and chamfer at the tail of the vehicle on pressure pulsations.The simulation results indicate that when high-pressure gas enters the annular cavity and impacts the second seal ring,it undergoes launch and back-flow,resulting in gradually weakening sinusoidal peri-odic impacts on the entire launch system.As the vehicle moves further,the amplitude of pressure pulsations gradually de-creases,and the maximum peak value in the entire pressure pulsation process can reach 1.45 times the launch pressure in the high-pressure chamber.Increasing the launch pressure in the high-pressure chamber leads to an increase in the peak of pres-sure pulsations in the annular cavity and an earlier arrival time for the peak.Increasing the length of the annular cavity leads to an increase in the peak value of pressure pulsations and a delayed arrival time for the peak.When there is a chamfer at the tail of the vehicle,the arrival time of the peak of pressure pulsations in the annular cavity is advanced.
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