An experimental and numerical investigation of vaporizer tubes associated with micro gas turbines

Olivier, Andre Jacobus (2015-03)

Thesis (MEng)--Stellenbosch University, 2015.


ENGLISH ABSTRACT: This study is an introductory investigation into vaporizer technology as implemented in micro gas turbines. Experimental investigations are aimed at the development of expectations concerning the internal flow structure though vaporizers by generating application specific flow maps. Consolidation of these maps with other experimental data suggests that annular flow leads to increased evaporation rates. In addition, it was discovered that flow structure is affected by the injection angle and air and fuel flow rates. An investigation into the numerical modelling of vaporizers is based on two phase flow theory using a flow structure approach. The numerical behaviour is observed for parametric variations to establish the impact of assumptions. A final numerical model is formulated with empirically determined coefficients with fair correlation to experimental data. The results of this study yield recommendations towards the implementation and analysis of vaporizers with applied use in micro gas turbines.

AFRIKAANSE OPSOMMING: Hierdie studie is 'n inleidende ondersoek na verdamper tegnologie soos toegepas in mikro gasturbines. Eksperimentele ondersoeke is gerig op die ontwikkeling van kennis rakende die interne vloeistrukture deur verdampers met die bou van toepassingspesifieke vloeikaarte. Konsolidering van hierdie kaarte met verdere eksperimentele data dui daarop dat annulêre vloei lei tot verhoogde verdampingstempo’s. Daar is ook bevestig dat die vloei struktuur deur die inspuitingshoek en vloeitempo’s affekteer word. 'n Ondersoek na die numeriese modellering van verdampers is gebasseer op twee-fase vloei met 'n vloeistruktuur benadering. Die numeriese gedrag is waargeneem vir parametriese variasies om sodoende die impak van aannames te bevestig. Die numeriese model is voltooi met empiriese bepaalde koëffisiënte en lei tot goeie korrelasie met eksperimentele data. Resultate van hierdie studie lei tot aanbevelings rakende die implementering en ontleding van verdampers met spesifieke toepassing op mikro gas turbines.

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