Open AccessInvestigation of Low-Temperature Lean Combustion Characteristics in Power Plants with External Heating of Components
Author(s) -
Nikolay Bachev,
Alena Shilova,
Oleg Matyunin,
O. A. Betinskaya
Publication year - 2021
Publication title -
problemele energeticii regionale
Language(s) - English
Resource type - Journals
ISSN - 1857-0070
DOI - 10.52254/1857-0070.2021.2-50.11
Subject(s) - combustion , combustion chamber , mechanics , turbulence , volumetric flow rate , flow (mathematics) , nuclear engineering , range (aeronautics) , work (physics) , power (physics) , materials science , environmental science , automotive engineering , thermodynamics , chemistry , physics , engineering , composite material , organic chemistry
An integral part of any open-type gas turbine plant is a low-emission combustion chamber, which is usually two-zone and cooled. One of the ways to reduce emission of harmful substanc-es is organizing low-emission low-temperature lean combustion with external heating of compo-nents. This paper investigates the effect of external heating of air and fuel gas on expansion of the lower combustion limit and stable flame position in a single-zone uncooled combustion chamber of a microgas turbine power plant. Stable position of the flame front in combustion chambers of this type mainly depends on the ratio between the average flow rate of the combus-tible-air mixture and the rate of turbulent combustion. This ratio depends on thermal, gas-dynamic, thermochemical and geometric factors. The purpose of this work is to substantiate the possibility of using the relative flow rate as a generalized characteristic. This goal was achieved in processing a large amount of published experimental data and numerical modeling of low-temperature combustion of lean mixtures. The most significant research result is determination of the range of relative flow rate (gk = 0.3…3.5·10-4 kg⁄s∙N), at which it is possible to ensure sta-ble flame position in a single-zone combustion chamber. Significance of the obtained results lies in the fact that using the relative flow rate makes it possible to quickly determine and analyze the geometric and gas-dynamic parameters and characteristics of turbulent combustion in com-bustion chambers of micro-gas turbine power plants.