A Thrust Test Method for Water Ramjet Engine

To explore a reasonable thrust test method for the water ramjet engine used in supercavitating underwater vehicle, an associative theoretical model between the engine nozzle thrust value and flow field parameters is established by means of theoretical analysis and simulation, and an underwater test and estimation method of the thrust value is proposed. Numerical calculation of the flow field is performed according to the shape and typical working conditions of a particular supercavitating vehicle. And the thrust value calculated with the proposed test method is compared with the design value to verify the feasibility of the proposed method. Furthermore, the conditions of over-expansion and under-expansion of the engine nozzle are analyzed, and the flow field characteristics of the nozzle outlet section are obtained, which may facilitate the key parameters measurement at the engine nozzle outlet section by the proposed method