Review of jet impingement in high-energy piping systems

Abstract

This study performs a literature review on jet impingement in high-energy piping systems as in nuclear power plants. The major contribution of the current work is to assess existing models through a comprehensive literature review on the blast wave, jet plume expansion and zone of influence, distribution of pressure within the jet plume, and jet dynamic loading. Important jet impingement phenomena, experimental studies in jet impingement, as well as modeling and CFD simulations of jet impingement are reviewed. Both single-phase (non-flashing water and steam) and two-phase mixture (steam-water) jets are covered in the current work. It is identified that pipe whip, jet expansion, jet impingement and critical flow are the key phenomena that should be investigated. While most of these phenomena have been modeled in the existing studies, the jet dynamic loading and blast wave phenomena were not considered in the jet impingement models. It is found that there has been limited study investigating these effects on jet impingement in nuclear power plants. As such, special attention needs to be paid when extending the current studies of jet dynamic loading and blast wave for model improvement. To provide experimental databases for these key phenomena, publicly available experimental studies on jet impingement are also reviewed. Most of the existing work have investigated the pressure distribution, thrust force, and impingement force. Considering that jet impingement is a complicated phenomenon that is affected by various factors, the initial flow conditions, break conditions, and target conditions in each experimental study are carefully reviewed. Finally, the existing models and CFD simulations on jet impingement are reviewed. Those include the models in ANSI/ANS-58.2 (1988) appendices, two-phase jet load model NUREG/CR-2913, the one-dimensional jet load model by Moody (1969) and a recent analytical model by Luxat (2017). The CFD simulation by Morita et al. (2018) correlates the jet geometry on jet properties at the exit plane such as density and static pressure, which can be used to improve the jet geometry modeling in future.