Simulation Of Cavitation Tunnel Design Speed Motion Underwater Hydrodynamic Environment

Underwater ammunition’s development requires considerable hydrodynamic experiments. Water tunnel is the most commonly used laboratory equipment. However, most of the water tunnel is designed for the airfoil flow, propeller cavitation and other experiments. So it’s not very suitable for underwater ammunition and it’s very expensive to conduct an experiment with those water tunnels. Therefore, to design a water tunnel for small underwater ammunition is particularly necessary.Firstly, based on the pipeline flow pressure loss, moment of momentum and energy equations and theories with reference to previous literature the water tunnel system’s characteristic equation was derived, further discussions obtained the relationship about flow, pump torque, rotate speed, motor power and power frequency, describing the tunnel system operating points. Secondly, use numerical simulation to analyze the flow in section tunnel and corner. On the basis of numerical calculations obtained the monitoring system project with LabVIEW and finished the software and hardware design. Then according to similar criteria analyzed the method to simulate high-speed motion and designed the pressure regulating device. Based on preliminary structural design the pressure loss was obtained and completed the detailed structural design and strength analysis of key components. Upon completion of the initial tunnel system installation and commissioning work on the tunnel system the water pressure, data acquisition, vibration characteristics tests were carried out. The results showed that the flow rate of experimental section is abovelOm/s, data acquisition was stable, the linearity between flow and power frequency was in line with the theoretical analysis and there was a resonance base frequency about5Hz with the tunnel structure, which need to avoid in experiments.The test results show that the tunnel preliminary meet the design requirements.