Experimental Investigation of Waterhammer in Simplified Feed Lines of Satellite Propulsion Systems

摘要: Operation of spacecraft propulsion systems is regularly adversely faced with waterhammer. The presence very low pressures or vacuum complicate the classically known waterhammer due to various multiphase phenomena such as cavitation, absorption and desorption a pressurizing gas, boiling, etc. This complex behavior hard model lack understanding physical processes taking place. To build up an experimental database on waterhammers in confined environments for validation models, literature survey was first undertaken detailed experiments. Only few papers well-documented experiments were found. None found matched all specifications needed proper simulation satellite hardware configurations. complement database, investigation phenomenon environment required. carried out using simplified setup two inert fluids, ethanol acetaldehyde, actual propellant, monomethylhydrazine. Numerous tests performed that confirmed excellent reproducibility results. showed can be used instead toxic monomethylhydrazine estimating amplitude. initial pipe pressure has great influence amplitude, but it would appear fluid vapor not boundary respect characteristics. produced exhibited evolution over time slight differences amplitude features according geometry.