Experimental investigation on pulsating pressure of a cone-cylinder-hemisphere model under different flow velocities

This paper presents the results of wall pulsating pressure experiments on a cone-cylinder-hemisphere model with lengths of 95 cm and maximum diameters of 20 cm under conditions of different flow velocities. By comparative analysis of experimental data, it has been found that the pulsating pressure on the wall surface of the flow-induced structure continues to rise as the flow velocity increases. It was also found that the pulsating pressure value of the shoulder and stern of the cone-cylinder-hemisphere structure is larger than in other positions. Additionally, the reliability and accuracy of the test results are verified by comparing the measured results with numerical simulation, and the characteristics and rules of the pulsating pressure of the flow-induced structure are analyzed. The pulsating pressure level is higher at the highest point and decays rapidly within 500 Hz; then, the decay rate slows down, and the pulsating pressure gradually decreases with frequency. Underwater vehicles usually adopt the form of a cone-cylindrical-hemisphere. Therefore, studying the pulsating pressure of a cone-cylinder-hemisphere structure is of great significance to the research of pulsating pressure and flow-induced noise of underwater vehicles.