Applying Radiation in the Engine
Remember during a combustion process heat is released so it has to get to a peak value at more advanced stages of the project a function of time radiation source will be added. Each type of flame depending on used fuel has a different radiatative thermal load in watts. You will need to calculate the area of the flame and based on that you can multiply the flame area with the generated thermal load.
An example will be used by using the area functions.
Recommended Link: http://aerojet.engr.ucdavis.edu/fluenthelp/html/ug/node580.htm
An example will be used by using the area functions.
Recommended Link: http://aerojet.engr.ucdavis.edu/fluenthelp/html/ug/node580.htm
Discrete transfer radiation model (DTRM)
Main assumption: radiation leaving surface element in a specific range of solid angles can be approximated by a single ray.
Limitations: – Assumes all surfaces are diffuse (isotropic reflection). – Effect of scattering not included. – Solving a problem with a large number of rays is CPU-intensive.
Advantages: – Relatively simple model. – Can increase accuracy by increasing number of rays. – Applies to wide range of optical thicknesses.
P-1 model
Computational effort: P-1 gives reasonable accuracy with less effortScattering: P-1 and DOM account for scattering. – Particulate effects: P-1 and DOM account for radiation exchange between gas and particulates.
Choosing a Radiation Model
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