To investigate the hydrodynamic characteristics of supercavitating vehicle expansion sterns
a series of 5 expansion stern models with different shapes have been designed with modular method. Under the constant water tunnel speed of 11m/s
the ventilation quantity of ventilation device is adapted and controlled to modify the inner pressure of the model bubble layer and the ventilation cavitation coefficient. Then a serial of supercavitation hydrodynamic characteristics comparison experiments for expansion stern models with different structure parameters is conducted in water tunnel. The characteristics that how the sterns affect the closed shape of the supercavitation are analyzed
with different ventilation quantity
different expansion stern half cone angles(2°
4°
6°)and different expansion stern diameters(Φ43 mm
Φ45 mm
Φ47 mm). The relationship between the fluid force and the wetted area of the sterns is discussed. The experimental results show that the drag coefficient and the lift coefficient increase with the increasing half cone angle and the diameter of the expansion stern. Compared with the lift direction
the drag coefficient gets more sensitive to the change of the cone angle and diameter of sterns. This result supports the further research on hydrodynamic layout design with the head cavitator
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Related Institution
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Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University