Combustion assignment help online experts

Combustion assignment help online experts

a.    Why a combustion model is required in fire simulations (6 marks)? Using the parameters given in the FDS theoretical manual, explain what are the major assumptions in the mixture fraction approach to simulate a diffusion flame (6 marks)? Can FDS simulate pre-mixed combustion and explosion (3 marks)?

b.    Mixture fraction Z is defined asWhere

– mass fraction of fuel

– mass fraction of oxygen

– fuel mass fraction in the fuel stream

– mass fraction of oxygen at infinity

– ratio of oxygen and fuel molecular weight in stoichiometric mixture

It is known that  =0.94,  =0.23 and s = 0.64. Calculate Z on the flame front (5 marks). If at some position  = 0.78, calculate Z at this position (5 marks). When use a value that is not given, please explain the reason for taking that value.

4.    Numerical techniques

a.    Write procedures to numerically solve the 1D unsteady heat conduction equation using explicit scheme (8 marks) and implicit scheme (7 marks).

b.    Consider a thin insulated rod 0.11 m long with k = 0.835×10-4 m2/s. Let ?x = 0.022 m and ? t = 0.1 seconds. At t=0 the temperature of the rod is zero. If one of the two ends is maintained at a temperature of zero and the other end is raised to a constant temperature 24°C immediately after 0s. Calculate the temperature distribution at t = 1 sec (10 marks).

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