Operability Limits of Tubular Injectors with Vortex Generators for a Hydrogen Fuelled Recuperated 100 KW Class Gas Turbine

[+] Author and Article Information
Stefan Bauer

Lehrstuhl für Thermodynamik Technische Universität München 85748 Garching, Germany

Balbina Hampel

Lehrstuhl für Thermodynamik Technische Universität München 85748 Garching, Germany

Thomas Sattelmayer

Lehrstuhl für Thermodynamik Technische Universität München 85748 Garching, Germany

1Corresponding author.

ASME doi:10.1115/1.4035842 History: Received December 23, 2016; Revised January 04, 2017


The configuration investgated in this study is a tubular air passage with fuel injection from one single orifice placed in the side wall. In the range of typical gas turbine combustor inlet temperatures, the performance vortex generator premixers have already been investigated for natural gas as well as for blends. For highly reactive fuels, the application of VGPs in recuperated gas turbines is particularly challenging because the high combustor inlet temperature leads to potential risk with regard to premature self-ignition and flame flashback. An atmospheric combustion VGP test rig has been designed, which facilitates investigations in a wide range of operating conditions in order to comply with the situation in recuperated micro gas turbines, namely global equivalence ratios between 0.2 and 0.7, air preheating temperatures between 288K and 1100K, and air bulk flow rates between 6-16 g/s. Both the entire mixing zone in the VGP and the primary combustion zone of the test rig are optically accessible. High speed OH* chemiluminescence imaging is used for the detection of the flashback and blow-off limits of the investigated VGPs. Flashback and blow-off limits of hydrogen in a wide temperature range covering the auto-ignition regime are presented, addressing the influences of equivalence ratio, air preheating temperature and momentum ratio between air and hydrogen on the operational limits in terms of bulk flow velocity. It is shown that flashback and blow-off limits are increasingly influenced by auto-ignition in the ultra-high temperature regime.

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