How do suppressants affect the propagation of laminar flames?
The thermal diffusion effect is one of the key influences that suppressants have on the propagation of laminar flames. Previous studies have shown that the weakening of thermal diffusion in premixed gases by diluents like CO 2 is a crucial mechanism behind the reduction in flame propagation speed .
How much HFC-227ea is required to suppress a TRG explosion?
Only 5% HFC-227ea is required to fully suppress the TRG explosion, whereas CO 2 requires 25%. On the fuel-lean side and at stoichiometric conditions (φ ≤ 1.0), HFC-227ea exhibits combustion enhancement, and this effect becomes more pronounced with increasing lean degree.
What is the explosion hazard of a 280 Ah LFP battery?
The TRG-air mixture from a 280 Ah LFP battery presents a significant explosion hazard, with maximum explosion intensity observed at φ = 1.1, where the Pmax reaches 0.475Mpa and the (d P /d t) max is 14.1 MPa/s. Under optimal explosion conditions (φ = 1.1), the suppression effectiveness of HFC-227ea is significantly superior to CO 2.
Are LFP batteries a hazard?
Specifically, the hazard for LFP batteries is significantly higher compared to lithium ternary (NCM) batteries, manifesting in greater maximum explosion pressure (Pmax), laminar burning velocity (LBV, Su0), and a lower explosion lower limit [15, 18].
Does HFC-227ea reduce heat transfer between burned and unburned zones?
This suggests that HFC-227ea may significantly weaken the heat transfer between the burned and unburned zones by drastically reducing the thermal diffusion capacity of the premixed gas, thereby increasing heat loss during flame propagation (as confirmed in the previous section) and ultimately inhibiting the flame propagation process.
Does HFC-227ea and CO2 promote flame propagation?
To better understand the chemical kinetics effects of HFC-227ea and CO 2 on flame propagation, we conducted a sensitivity analysis of LBV under different initial conditions. A positive sensitivity coefficient indicates that the reaction promotes flame propagation, while a negative value implies inhibition .
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