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Reduction of thermodynamic losses in a supersonic nucleating steam nozzle by spraying water droplets. (English) Zbl 1350.76033

Summary: During the course of expansion of steam in turbines, the vapour first supercools and then nucleates to become a two-phase mixture. Formation of the liquid phase causes thermodynamic and aerodynamic losses in steam turbines. In this study, the treatment is a one-dimensional, non-equilibrium ow in a steady Laval nozzle. In this paper, the changes in the rate of nucleation, entropy, pressure and other parameters of the two-phase flow, subjected to spraying the liquid droplets close to the nozzle’s throat, are investigated. By injecting the water droplets into a supersonic condensing flow, the thermodynamic loss is considerably decreased.

MSC:

76J20 Supersonic flows
76T10 Liquid-gas two-phase flows, bubbly flows
80A20 Heat and mass transfer, heat flow (MSC2010)
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