Azimuth waterjet propulsion system can broaden the navigation range of the ship, enhance the adaptability of ships in the shallow water area and other complex environments, and improve the mobility of the ship, which has a wide range of application prospects. In this paper, the numerical simulation was applied to investigate internal flow of azimuth waterjet propulsion system, the accuracy of numerical simulation was validated by experiment. The thrust and efficiency at different speeds were compared, the entropy generation rate is introduced to evaluate the loss ratio of different hydraulic component, the internal flow fields of azimuth waterjet propulsion system were analyzed in detail to reveal the flow mechanism caused by the variation of speed, which will provide guidance for the optimization design of azimuth waterjet propulsion system.

Marine Design and Research Institute of China (MARIC) established the international standard (ISO 4679): Ships and marine technology — Hydraulic performance tests for waterjet propulsion system based on the research on hydraulic performance tests for waterjet propulsion system. The current study focuses on the main contents of the ISO 4679. The ISO 4679 specified the terms and definitions, the acceptance criteria, the test method and the test report of hydraulic performance tests for waterjet propulsion system, and provided the examples of test report template and test devices. The hydraulic performance tests for waterjet propulsion system include hydraulic performance tests and cavitation tests (optional), divided into Class A and Class B for the two different purposes of scientific research and acceptance test, respectively. The Class A is of precision grade for hydraulic model tests with a nominal diameter of 300mm or below, or high precision prototype tests. And the Class B is of engineering level for batch acceptance tests of small and middle-sized models or intermediate tests of pump models. The standard ISO 4679 specifies corresponding acceptance criteria for the two levels. The formulation of ISO 4679 builds a unified communicating platform for relevant parties in the hydraulic performance tests for the waterjet propulsion system, weakening the barriers to the technical exchange and advancing the development of the test technology for the waterjet propulsion system.