Reaction properties

[Kseow]

I have some problems defining the reaction properties in order to specify the correct combustion products in the FDS simulation. In the model, I have created a simple burner surface to represent the fuel package that is likely to be involved in fire for a simulation scenario.

The problem is that FDS only allows one material to be set as predominant reaction, such wood or polyurethane. Please can someone advise regarding the selection of appropriate reaction properties for FDS models that contain a fuel package? Are there any guidance available for users to work out the reaction properties for a combine fuel item?

Ken

[Charlie Thornton]

There is a short section in the FDS Users guide that may be helpful to you. It is Multiple Solid Phase Reactions in Section 8.4.4 Solid Fuels that do NOT Burn at a Specified Rate. If all goes well, I think that will give you the background you need to figure out how to enter multiple reactions in our material dialog (see attached).

[ukjxm053]

We are modelling the fire. We do not necessarily define the exact reaction properties. If you are interested in temperature, define correct HRR should be sufficient. If you are also interested in other yields such as soot, CO, ..., correct yields are more important than the actual reaction itself. Be careful when you are using the default values.