- Author
- Ang, J. A. | Pagni, P. J.
- Title
- Forced Flow Boundary Layer Flames With Thermal Cracking.
- Coporate
- California Univ., Berkeley
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Contract
- NBS-GRANT-60NANB5D0552
- Keywords
- diffusion flames | boundary layers | thermal cracking (chemistry) | thermal cracking (chemistry)
- Abstract
- The classic similarity solutions of boundary layer diffusion flames used the flame sheet approximation to simplify the governing equations by introducing Shvab-Zeldovich variables. In this study, the effect of endothermic cracking of the fuel is introduced to the forced flow boundary layer flame solution by using a simple cracking sheet model and defining new Shvab-Zeldovich variables. A simple model is also presented which replaces the common assumption of constant density-viscosity product with a power law function of temperature. Both effects do not destroy similarity so the advantages of solving Blasius-type equations are preserved. The primary effect of the thermal cracking is to create a second discontinuity which represents the cracking sheet. This sheet pulls the surrounding temperatures down and greatly reduces the temperatures between the wall and the cracking sheet.