RT info:eu-repo/semantics/article
T1 A correlation for turbulent combustion speed accounting for instabilities and expansion speed in a hydrogen-natural gas spark ignition engine
A1 Giménez, Blanca
A1 Melgar, Andrés
A1 Horrillo, Alfonso
A1 Tinaut, Francisco V.
K1 Quasi-dimensional combustion diagnosis
K1 Turbulent combustion speed
K1 Natural gas –hydrogen mixtures
K1 Premixed combustion
K1 Internal combustion engine
K1 Instabilities
K1 Expansion speed
AB An analysis of the turbulent premixed combustion speed in an internal combustion engine using natural gas, hydrogen and intermediate mixtures as fuels is carried out, with different air-fuel ratios and engine speeds. The combustion speed has been calculated by means of a two-zone diagnosis thermodynamic model combined with a geometric model using a spherical flame front hypothesis. 48 operating condi- tions have been analyzed. At each test point, the pressure record of 200 cycles has been processed to calculate the cycle averaged turbulent combustion speed for each flame front radius. An expression of turbulent combustion speed has been established as a function of two parameters: the ratio between turbulence intensity and laminar combustion speed and the second parameter, the ratio between the in- tegral spatial scale and the thickness of the laminar flame front increased by instabilities. The conclusion of this initial study is that the position of the flame front has a great influence on the expression to calculate the combustion speed. A unified correlation for all positions of the flame front has been ob- tained by adding one correction term based on the expansion speed as a turbulence source. This unified correlation is thus valid for all experimental conditions of fuel types, air–fuel ratios, engine speeds, and flame front positions. The correlation can be used in quasi-dimensional predictive models to determine the heat released in an ICE.
PB Elsevier
SN 0010-2180
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/73950
UL https://uvadoc.uva.es/handle/10324/73950
LA spa
NO Combustion and Flame, 2021, vol. 223, p 15-27
NO Producción Científica
DS UVaDOC
RD 22-ene-2025