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Influence of Periodic Disturbance Incoming Flow on the Supercavitation Phenomenon
Qingliang Zeng1, Mingzheng Zhao1, Chunyong Fan1
1College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
ACS Omega
|June 10, 2024
Summary
Periodic disturbances in marine environments significantly alter supercavitation flow around projectiles. Increased frequency and amplitude can cause cavity collapse, impacting projectile stability and performance.
Area of Science:
- Fluid Dynamics
- Hydrodynamics
- Cavitation Physics
Background:
- Supercavitation research traditionally overlooks marine environmental disturbances.
- Understanding these disturbances is crucial for projectile stability in real-world conditions.
Purpose of the Study:
- To investigate the impact of periodic disturbances on supercavitation flow dynamics.
- To quantify the effects of varying disturbance frequencies and amplitudes on cavity stability.
Main Methods:
- Numerical simulation of a slender projectile in a disturbed flow field.
- Definition of periodic functions to model marine environmental disturbances.
- Analysis of cavity profile evolution, length, and enveloping capability.
Main Results:
- Cavity profile exhibits periodic evolution synchronized with external disturbances.
- Higher frequencies and amplitudes lead to smaller minimum cavity dimensions and larger maximum dimensions.
- Established a relationship between cavity length and frequency (l = -7.381f + 215.384) for non-enveloping conditions.
- Determined critical ranges for frequency (7.16 ≤ f < 7.96) and amplitude (1.1 ≤ am < 1.22) for cavity envelopment.
Conclusions:
- Periodic disturbances are key factors influencing supercavitation flow stability.
- Findings provide a theoretical basis for maintaining supercavitation in disturbed marine environments.
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