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Maximum discharge pressure of supercritical two-phase steam injector

100%

Trela M. , Kwidziński R. , Buła M.

Archives of Thermodynamics

2004

tom Vol. 25, no. 1

41-52

The paper aims at the determination of the maximum output pressure as one of the pertinent parameters describing the steam injector performance. Experimental and theoretical results of discharge pressure investigation from steam-water injector are presented. Experiments included measurements of output pressure dependence on varying inlet flow rates of both media and on the water nozzle gap. Maximum output pressure obtained reached 97% of the inlet vapour pressure. Performance of the steam injector is described mathematically using momentum balance in mixing chamber and shock wave region. Loss coefficient of the steam injector is also determined. Having the loss coefficient one can evaluate the maximum pressure for geometry similiar steam injectors. From the analysis of the balance equations, the ways of increasing the maximum discharge pressure are suggested.

Modelling of physical phenomena in supercritical two-phase steam injector

100%

Trela M. , Kwidziński R.

Archives of Thermodynamics

2003

tom Vol. 24, no 4

15-34

The paper considers problems specific to physical description and modelling of two-phase flow in supercritical steam injector. Flow patterns, condensation and a shock wave are discussed. The model of annular flow for the mixing chamber is proposed and used to determine scaling criteria. Thereafter average heat exchange coefficient in the mixing chamber is evaluated from correlation of experimental data. A model based on the concept of macroscopic viscosity, describing the wave is also presented.