Ship air film drag reduction and energy conservation technology includes the air film theorem and valuable experience and key technologies accumulated through hundreds of research tests and real-ship applications, forming a practical theory and design model, which is a cost-effective way for ship energy conservation and emission reduction. Technical approach. When using a fan to input air to the bottom of the ship, the installed bottom deflector device can effectively form a continuous thin air film on the bottom of the ship. Experimental research and application test results on two real ships show that energy conservation can be achieved by about 15% for transport ships and high-speed ships. The invention first solved the technical problem of effectively forming a continuous thin film air membrane on the ship bottom in the world, passed ministerial technical appraisal, and was also an excellent energy-saving scientific and technological achievement recognized and promoted by the country and a transformation project of Shanghai City's high-tech achievements and a 2013 Shanghai Science and Technology Action Plan project, independent intellectual property rights ship air membrane drag reduction and energy conservation technology has obtained national invention patents, and has applied for five patents. The 2004 novelty review report of the Shanghai Branch of the Chinese Academy of Sciences (report number: 200421C0700182) mentioned that "no one has been found to propose a similar air film constant formula before this. Therefore, although my country's research on ship air lubrication started late, it has become a leading position in the world in terms of research and application of thin film air film drag reduction technology. With the development of society and economy, ship thin film air film drag reduction technology will be widely used, and its application prospects are very broad and will have a profound impact on ship design."

Application situation or application prospects: 1. Design and build air-film drag-reducing and energy-saving transport ships. Without increasing investment, energy conservation can reach about 15%. Design and build a 50,000-ton 4,200 TEU and a 100,000-ton 8,000 TEU rapid air-film drag reduction container ship. The air-film at the bottom of the ship can reduce the contact area between the hull and water by 35- 40%, and the air-film drag reduction and energy conservation can be achieved by about 15%. Fuel costs can be saved by approximately RMB 12 million and RMB 25 million per year. Designing and building air-film drag-reducing and energy-saving cargo ships and oil tankers will be the future development direction of green and low-carbon ships. Since our company designs air-film drag reduction and energy-saving ships for shipping companies, we can obtain additional high added value of air-film drag reduction and energy-saving ships, and is beneficial to environmental protection, this can form our company's market advantage and realize the application and development of air-film drag reduction and energy-saving ships.

2. The design and construction of the air-film drag reduction high-speed craft includes the combination of the low-drag high-speed craft ship type technology developed by the inventor and the air-film drag reduction energy saving technology. Comparative test results show that the air-film drag reduction high-speed craft has a resistance that is 22% lower than that of the catamaran hovercraft of the same weight and speed. Since the air-film drag reduction high-speed craft does not have a flexible apron, daily maintenance is simple and low cost. It is also more suitable for the design and construction of larger energy-saving high-speed passenger ships and high-speed military ships, as well as the design and construction of air-film drag-reducing and energy-saving yachts.