Combustion Air-Fuel Ratio Calculator
Calculate stoichiometric and actual air-fuel ratios for combustion analysis
About this calculator
The Combustion Air-Fuel Ratio Calculator determines the optimal air-to-fuel ratios needed for efficient combustion processes. It calculates both stoichiometric ratios (theoretically perfect combustion) and actual ratios used in real-world applications. This tool is essential for engineers, technicians, and students working with internal combustion engines, boilers, furnaces, and other combustion systems to optimize fuel efficiency, reduce emissions, and ensure complete combustion.
How to use
Enter the fuel type and composition or select from common fuels like gasoline, diesel, or natural gas. Input the actual air flow rate and fuel flow rate if analyzing an existing system. The calculator will display the stoichiometric air-fuel ratio and compare it to your actual ratio, showing whether the mixture is rich or lean.
Frequently asked questions
What is stoichiometric air-fuel ratio?
The theoretical air-fuel ratio where fuel burns completely with no excess air or unburned fuel remaining, providing maximum combustion efficiency.
Why do engines run rich or lean mixtures?
Rich mixtures provide more power and cooler combustion, while lean mixtures improve fuel economy and reduce emissions at lower power outputs.
How does air-fuel ratio affect engine performance?
Proper ratios optimize power, fuel efficiency, and emissions. Incorrect ratios can cause poor performance, increased pollution, or engine damage.