Resumen de Research on decarbonization and frictional resistance reduction with microbubble drag reduction
Yanan Zhou, Guangwu Liu, Mirko Toman, Zhiyong Pei
Microbubble drag reduction (MBDR) technology has shown great potential in reducing the frictional resistance of ships, thereby lowering CO2 emissions and carbon intensity. It is also aligned with the International Maritime Organization's (IMO) target of reducing the carbon intensity of ships by 40% before 2030. However, numerous factors and complex coupling relationships involved in the gas-liquid twophase flow at the ship's bottom involves pose challenges for current microbubble drag reduction technology in meeting the requirements of drag reduction, carbon emission reduction, and energy savings in practical applications. To achieve the objective of energy savings and carbon reduction, microbubble drag reduction is proposed to apply on River-Sea-Going ships and development of a microbubble drag reduction adaptive control system. Self-propelled model tests of microbubble drag reduction are conducted with different sailing speed and airflow rate. Database of model thrust under different operation conditions is created. Then a mathematical model can be obtained with sample data based on machine learning. Finally, test parameters are predicted to achieve adaptive control of the airflow rate. The adaptive control system implemented in the research can improve the reliability of microbubble drag reduction.
