Laminar Flame Speeds of Gasoline Surrogates Measured with the Flat Flame Method



  • Laminar flame speed is a key parameter in engine design/performance, contains the information of reactivity/diffusivity/exothermicity, and serves as a good validation of kinetic mechanisms.
  • Surrogate fuels are the alternative to gasoline in many combustion applications; there is lack of combustion characteristics, data, and performance in surrogates fuels


  • The measurement will be performed at atmospheric pressure over equivalence ratios of Φ = 0.7 – 1.4  and a range of unburned gas temperatures of Tu = 298 – 400 K.

  • The fuel mixtures with different blend concentrations and RON’s will be covered and the study will establish the temperature, mixture and RON dependence of laminar flame speed for gasoline surrogates.


  • The flat flame method has the advantages of producing a well-defined, 1-D flat flame free of stretch, and requiring less complicated experimental setup
  • To determine the laminar flame speed, a technique (as shown in Fig. 1) with heat extraction through the cooling water, similar to that described in Botha and Spalding (1954), is employed and the adiabatic laminar flame speed is obtained by extrapolation.​

Laminar1Figure 1. A Schematic of heat extraction 

C8H18-Temp effects


Figure 2. The laminar flame speeds of iso-octane