sci.stoichiometric-AFR-fuel Calculator
Calculates the stoichiometric air-fuel ratio (AFR) by mass from the fuel's elemental composition: AFR = (11.5C + 34.5H − 4.3O + 4.3S)/1. Stoichiometric AFR: petrol ≈ 14.7:1; diesel ≈ 14.5:1; ethanol ≈ 9.0:1; methane ≈ 17.2:1.
Inputs
- C Pct
- Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
- H Pct
- Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
- S Pct
- Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
- O Pct
- Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Results
- stoichiometric AFR (mass)
- The computed mass of the object or substance.
- O₂ required (kg/kg fuel)
- Reference formula or conversion factor shown for context.
- estimated LHV (kJ/kg)
- The value at the specified point or condition.
- AFR = (O₂_stoich/0.233)
- Reference formula or conversion factor shown for context.
- fuel reference
- Sample size or count used in the calculation.
- equivalence ratio φ=1
- The proportional relationship between two quantities.
required hydrogen carbon fuel mass