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Liquid resistance in underwater laser propulsion.
Applied Optics
|August 12, 2025
Summary
Underwater laser propulsion involves liquid resistance proportional to target velocity and propulsion area. This study quanties resistance for efficient underwater propulsion systems.
Area of Science:
- Fluid Dynamics
- Laser Physics
- Materials Science
Background:
- Underwater laser propulsion is a novel technology with potential applications.
- Understanding liquid resistance is crucial for optimizing propulsion efficiency.
- Previous studies have not fully quantified resistance in this context.
Purpose of the Study:
- To investigate and quantify liquid resistance in underwater laser propulsion.
- To establish a relationship between target properties, propulsion energy, and liquid resistance.
- To derive an analytical formula for liquid resistance in this scenario.
Main Methods:
- Conducted underwater propulsion experiments using cylindrical titanium targets of identical mass and varying propulsion areas.
- Employed high-speed photography to capture experimental data.
- Derived an analytical formula to model energy dynamics and resistance.
Main Results:
- Liquid resistance is directly proportional to the target's velocity before stable velocity is achieved.
- Liquid resistance is also directly proportional to the target's propulsion surface area.
- An analytical formula was developed to describe the interplay of kinetic energy, bubble energy, and liquid resistance.
Conclusions:
- Liquid resistance significantly impacts underwater laser propulsion performance.
- The derived formula provides a quantitative basis for designing more efficient underwater laser propulsion systems.
- Controlling target velocity and propulsion area is key to minimizing liquid resistance.
