首页|Heat and mass transfer in a cryogenic tank in case of active-pressurization
Heat and mass transfer in a cryogenic tank in case of active-pressurization
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NSTL
Elsevier
Predicting the pressurant requirements is one of the key challenges for cryogenic propulsion systems。 In this context， a numerical model to simulate the tank pressurization that considers evaporation and condensation phenomena was developed and applied。 The novel solver combines a gradient-based phase change model with a weakly compressible multiphase solver of OpenFOAM based on the pressure implicit method with splitting of operator (PISO) algorithm。 To maintain a sharp interface the mass source terms are applied to the cells adjacent to the interface。 First， the model is validated against two analytical solutions: the one-dimensional phase change problem and secondly， the growth of a vapor bubble in a superheated liquid in the absence of gravity。 In a second step， the validated model was applied to a cryogenic pressurization experiment。 The measured pressure behavior could be confirmed with the numerical model being in a good approximation。 With the numerical model further insights into the physical behavior could be achieved。 The condensation and evaporation effects have a significant impact on the pressure development during and after the pressurization。 The mass flows due to phase change occurring at the vapor-liquid interface depend on interface location and time。 Directly at the wall， evaporation becomes dominant while condensation occurs at the center area of the liquid surface。
NSTL
Elsevier
