Low Emissions Propulsion Engine Characterization Process

Mongia, H. C.

doi:10.1007/978-981-16-2648-7_2

Cited by 1 publication

(1 citation statement)

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“…Because of the possibility of controlling NO x emissions at a very low level, the lean premixed staged combustion is often applied by most manufacturers to replace the traditional diffusion combustion. 3,4 The lean premixed combustor developed by Rolls-Royce, 5–7 General Electric 8,9 and JAXA 10–12 have been widely used to meet the requirements of low emission. The fuel and the oxidant are premixed first when lean premixed combustion technology is adopted.…”

Section: Introductionmentioning

confidence: 99%

The effects of swirl number on the combustion characteristics in an internally-staged combustor

Zhao

Liu

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The three-dimensional turbulent swirling flame in an internally-staged combustor is numerically investigated. Four cases over a range of swirl intensities are explored by the Flamelet Generated Manifold model in this paper. Special attention is paid to analyzing the variation of the flow field, temperature, major species concentrations and emissions. The results clearly show the effects of swirl number on the size of the center recirculation zone, fuel distribution and combustion characteristics. When the third premixed stage swirl number increases from 0.6 to 1.2, the axial length of the center recirculation zone decreases by 3.7%, while the radial length increases by 6.9%. The characteristics of the flow field play an important role in the spatial distribution of the fuel, which further affects the temperature distribution in the combustor. The backflow effect is enhanced, resulting in a greater concentration of fuel at the outlet of the swirler. After the maximum temperature is reached at the exit position of the pilot stage, the temperature decreases compared to the peak temperature downstream as the proportion of premixed combustion mode increases. This creates a high concentration region of OH at the outlet of the pilot stage injector and the heat release region is squeezed upstream. At the same time, the volume of the high-temperature region downstream of the pilot stage is reduced. In addition, as the swirl number of the third premixed stage increases from 0.6 to 1.2, the emissions of NO and CO decrease by 28.7% and 75%, respectively.

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