Wang, Xueyan;
Tian, Hua;
Shu, Gequn;
Luo, Kai H;
Yang, Zhao;
(2025)
Impact of tetrafluoropropene isomers on propene combustion: Experimental insights and chemical kinetic analysis.
Chemical Engineering Science
, 318
, Article 122226. 10.1016/j.ces.2025.122226.
(In press).
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Luo 2025 CES propene accepted.pdf - Accepted Version Access restricted to UCL open access staff until 17 July 2026. Download (6MB) |
Abstract
HFO and hydrocarbon refrigerants are among the most promising environmentally friendly alternative refrigerants. However, their flammability requires special attention. This study investigates the flammable effect of tetrafluoropropene isomers (R1234yf, R1234ze(E)) on R1270, providing the data of flammability limits and refining chemical kinetic models to assess fire potential. This study uses a high-speed camera and visual criteria to obtain the flammability limits of refrigerant mixtures. The initial conditions were 298.15 K dry air to minimize moisture contamination. The flammable zones of R1270 are 2.54 %∼10.75 %. The tetrafluoropropene isomers promote flammable phenomena in lean combustion, but inhibit flame near rich combustion. As the diluent refrigerants increase, the lean and rich limits merge. For the first time, a detailed kinetic model for the oxidation of the R1234yf/R1270 mixture is developed based on the NIST2021, USC Mech II and San Diego 2016 mechanisms, which includes 138 species and 1223 reaction. Simulated results show that the kinetic model could provide a reasonable explanation of the experimental phenomena. Rate of production and sensitivity analyses were conducted to reveal the interaction of blending. The results highlight that R1234yf influence macroscopic combustion phenomena mainly by micro-regulating the production rate of reaction path and OH/H/O mole fraction. The study provides data and theoretical guidance on disaster prevention and mitigation for mixed refrigerants.
| Type: | Article |
|---|---|
| Title: | Impact of tetrafluoropropene isomers on propene combustion: Experimental insights and chemical kinetic analysis |
| DOI: | 10.1016/j.ces.2025.122226 |
| Publisher version: | https://doi.org/10.1016/j.ces.2025.122226 |
| Language: | English |
| Additional information: | This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Working fluid, Flammability limit, Inhibition mechanism |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10211874 |
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