A correlation for turbulent combustion speed accounting for instabilities and expansion speed in a hydrogen-natural gas spark ignition engine
| Autor: | Alfonso Horrillo, F.V. Tinaut, Andrés Melgar, B. Giménez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen General Chemical Engineering General Physics and Astronomy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Combustion Premixed combustion 01 natural sciences Physics::Fluid Dynamics 020401 chemical engineering Natural gas Spark-ignition engine 0103 physical sciences Physics::Chemical Physics 0204 chemical engineering Turbulent combustion speed Physics::Atmospheric and Oceanic Physics 010304 chemical physics Turbulence business.industry Expansion speed Laminar flow General Chemistry Mechanics Internal combustion engine Natural gas - hydrogen mixtures Fuel Technology chemistry Instabilities Turbulence kinetic energy MAQUINAS Y MOTORES TERMICOS business Quasi-dimensional combustion diagnosis |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1016/j.combustflame.2020.09.026 |
| Popis: | [EN] 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. The authors of this work would like to thank the Spanish Ministry of Science and Innovation for the financial support of this research through the ENE 2012-34830 (with FEDER funds) and the Regional Government of Castile and Leon for funding the Excellence Research Group GR203 |
| Databáze: | OpenAIRE |
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