Integration of Fluidic Nozzles in the New Low Emission Dual Fuel Combustion System for MGT Gas Turbines

Abstract

Fluidic oscillators have proven their capabilities and advantages in terms of the generation of oscillating jets without moving parts for many years, mainly in experimental studies. In this paper, the design, development, and integration of fluidic atomizers into the liquid-fuel system of the dual-fuel low NOX Advanced Can Combustion (ACC) system of the MAN Gas Turbines (MGT) are presented. The two-stage system comprises a pressure-swirl nozzle as a pilot stage and an assembly of four main premixed nozzles, based on fluidic technology. The design and the features of the pilot nozzle are briefly presented, whereas the focus lies on the functionality and layout of the fluidic nozzles. The complete integration, validation, and verification of this innovative liquid-fuel injection unit are presented. The final system features fast fuel-switchovers, low complexity, high reliability, and dry low emissions in liquid-fuel operation.

Editorial for the Special Issue on “Fluidic Oscillators—Devices and Applications”

“…Those can be harmful for the process and the device itself. Due to high frequencies and high entrainment, fluidic devices have shown that they are applicable for fuel-mixture preparation for liquid fuels in gas turbines [21] as well as for hydrogen in piston engines for trucks [22]. Furthermore, lean combustion devices often involve swirling flames that may be accompanied by a precessing vortex core, which can lead to combustion instabilities and suboptimal emission.…”

Free Stream Behavior of Hydrogen Released from a Fluidic Oscillating Nozzle

“…In recent years, fluidics have been rediscovered for commercial applications. For example, they are used in windshield wipers [11], in active flow control [12][13][14], in biochemistry for the generation of microbubbles [15,16], and even as diesel injectors for small gasturbines [17]. Most of these applications benefit from the jet dynamics and the robustness of the devices.…”