primary reference fuel


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primary reference fuel

[′prī‚mer·ē ′ref·rəns ‚fyül]
(materials)
Gasoline; isooctane, n-heptane, or mixtures thereof used in the American Society for Testing and Materials-Cooperative Fuel Research gasoline test engine to determine the octane rating of commercial gasoline.
Diesel fuel; cetane, α-methylnaphthalene, or mixtures thereof used in ASTM-CFR diesel test engines to rate the cetane number of commercial diesel fuels.
References in periodicals archive ?
Primary Reference fuel (PRF) blends (Blend description: PRF: Combination of Iso-Octane-n-heptane, digit after PRF:percentage of Iso-Octane, E: Ethanol, last digit: Ethanol percentage in the blend) Fuel blends PRF70 PRF84 Ethanol (%) PRF70-E0 100 -- 0 PRF70-E2 98 -- 2 PRF70-E5 95 -- 5 PRF70-E10 90 -- 10 PRF70-E15 85 -- 15 PRF70-E20 80 -- 20 PRF84-E0 -- 100 0 PRF84-E2 -- 98 2 PRF84-E5 -- 95 5 PRF84-E10 -- 90 10 PRF84-E15 -- 85 15 PRF84-E20 -- 80 20 Table A3.
Blends of iso-octane and n-heptane are referred to as primary reference fuels (PRFs).
For a primary reference fuel, RON = MON = OI or S = 0 by definition.