Exploring a correlation to predict boundary layer flashback limits

Several correlations to predict boundary layer flame flashback proposed by other researchers were gathered and assessed for their limitations and accuracy. Some were applicable only at atmospheric pressure, others did not perform well with data outside their original datasets, and some were based on unrealistic assumptions. Consequently, it was determined that none of these correlations were suitable for our objectives. Therefore, various experimental data sets were compiled and cross-compared for validation to develop a more appropriate correlation. Then Extinction Stretch Rate (ESR) was recognized as a crucial characteristic of the fuel-air mixture and was selected as the representative property. Afterwards, attempts were made to link ESR with specific flow characteristics, and the relationship between ESR and several flow parameters was investigated. Subsequently, a correlation was developed to predict boundary layer flashback based on the relationship between ESR and ut. This correlation is useful to determine the flow velocity limit to prevent confined boundary layer flame flashback in a burner under varying temperatures, pressures, and fuel compositions including different methane and hydrogen combinations.