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Investigation of steam injector with variable throat cross-section

Kwidziński R., Trela M.

Archives of Thermodynamics

2007

Vol. 28, no. 1

3-14

Increase of discharge pressure from steam injector by varying the throat cross-section of the mixing chamber with a moving needle is investigated experimentally and theoretically. Maximum discharge pressure was measured in two versions of the injector with the tapered needle inserted into the mixing chamber throat at varying deepness. Highest value of discharge pressure observed experimentally exceeded by about 35% the inlet steam pressure. This result is confirmed by theoretical consideration based on the momentum balance equation for the mixing chamber. In calculations, irreversible losses in the mixing chamber and Condensation shock wave are taken into account by total loss coefficient for which new correlation is proposed.

Maximum discharge pressure of supercritical two-phase steam injector

Trela M., Kwidziński R., Buła M.

Archives of Thermodynamics

2004

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.

Investigation of dispersive shock wave in two-phase injector

Kwidziński R., Trela M.

Archives of Thermodynamics

2004

Vol. 25, no. 3

27-45

The paper concerns modelling of dissipation in a shock wave in one-component two-phase bubbly flow. Coefficient of macroscopic viscosity is proposed to describe energy dissipation in terms of homogeneous model. The value of macroscopic viscosity is calculated from entropy production in boundary layer around a bubble. Introduction of the macroscopic viscosity allowed for paper description of dispersive shock wave observed in supercritical steam injector.

Modelling of physical phenomena in supercritical two-phase steam injector

Trela M., Kwidziński R.

Archives of Thermodynamics

2003

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.