Abstract: With the frequent occurrence of urban waterlogging and the increasing severity of flood disasters in China, the importance of emergency drainage and rescue equipment is becoming increasingly prominent. To meet this demand, the development of emergency rescue vehicles and high-power density submersible pumps are summarized, and a new type of high-flow submersible electric pump is developed, which is driven by a permanent magnet synchronous motor, features high power density, large displacement, and lightweight portability. In order to improve the comprehensive performance of the submersible pump, a combination of numerical simulation and experimental verification methods is employed, to investigate the internal flow characteristics of the submersible pump. With the SST k-ω turbulence model as the calculation model, various flow rates (0.6Q, 0.8Q, 0.9Q, 1.0Q, 1.1Q, and 1.2Q) are selected; Representative velocity distribution maps are selected to compare and analyze the internal flow structures and their variations under different flow rates;The pressure load curves of the impeller blades and guide vanes are extracted. The application of the high-power density portable submersible pump in this emergency drainage and rescue vehicle has broad prospects and aligns with the development trend of the emergency drainage industry. The research in this study contributes to improving the hydraulic performance of submersible pumps, thereby enhancing urban disaster prevention and mitigation capabilities.

Key words: high power density; portable; submersible pump; emergency drainage; high-flow emergency supply and drainage rescue vehicle