Turbulent Nonpremixed Flames
- List five practical examples of turbulent diffusion flames in engineering.
- How do turbulent diffusion flames (nonpremixed flames) differ from turbulent premixed flames?
- How does flame length vary with:
- stoichiometric mixture fraction
- jet exit diameter
- density ratio (exit to surroundings)
- How does a turbulent jet flame length vary with volumetric flow rate for a given jet exit diameter?
- What is the physical interpretation of the Froude number?
- What physical process/consideration motivates its use?
- T/F: for a momentum controlled jet, the dimensionless flame length is independent of Fr.
- Does buoyancy tend to increase or decrease jet flame lengths?
- What is the typical length-to-width ratio for turbulent jet flames?
- What are theories for lifted flames?
- What three quantities does radiative heat loss primarily depend on?
- Describe how increasing turbulent mixing affects flame temperatures in terms of soot, radiation, and flame strain.