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http://dx.doi.org/10.6108/KSPE.2018.22.6.084

Effect of Heat Transfer and Phase Change of Coolant on the Performance of Mixed-gas Ejection System  

Kim, Hyun Muk (Department of Mechanical Engineering, Pukyong National University)
Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.6, 2018 , pp. 84-93 More about this Journal
Abstract
Three-dimensional (3D) numerical simulations have been carried out to study how coolant injection conditions influence the cooling efficiency and projectile ejection performance in a mixture-gas ejection system (or gas-steam launch system). The 3D single-phase computational model was verified using a 1D model constructed with reference to the previous research and then a two-phase flow computation simulating coolant injection on to hot gas was performed using a DPM (Discrete Phase Model). As a result of varying the coolant flow rate and number of injection holes, cooling efficiency was improved when the number of injection holes were increased. In addition, the change of the coalescence frequency and spatial distribution of coolant droplets caused by the injection condition variation resulted in a change of the droplet diameter, affecting the evaporation rate of coolant. The evaporation was found to be a critical factor in the design optimization of the ejection system by suppressing the pressure drop while the temperature decreases inside the breech.
Keywords
Gas-steam Launch; Dynamic Grid System; Discrete Phase Model; Multi-phase Flow;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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