MECHANICAL ENGINEERING
Combustion Laboratory
DARTFIRE Simulation
LEWIS RESEARCH CENTER

PPS2A Parameters

Property

Symbol

Value and units

Ambient temperature

298 K

Ambient mass fraction

0.5

Ambient pressure (atm)

p

1 atm

Mean velocity of the opposed-flow

Vg

variable

Lewis number

1

Planck mean absorption coefficient

variable

Specific heat of gas at 700 K

1.183 kJ/(kgK)

Activation energy for the gas-phase reaction

Eg

8.895× 104 kJ/kmol

Activation temperature of the gas-phase

10.7× 103 K

Pre-exponential factor of gas-phase reaction

Bg

5.928× 109 s-1

Stoichiometric ratio

s

1.92

Heat of combustion

25.9× 103 kJ/kgF

Thermal conductivity of the gas at 700K

l g

4.84 × 10-5 Ns/m2

Absolute viscosity of the gas at 700K

m g

0.0675x10-3 Ns/m2

Activation energy for pyrolysis reaction

Es

12.978× 104 kJ/kmol

Activation temperature for pyrolysis

7805 K

Pre-exponential factor for pyrolysis

As

2.82x109 s-1

Specific heat of solid fuel

1.465 kJ/(kgK)

Solid fuel density

r s

1.19× 103 kg/m3

Pyrolysis heat of vaporization

941.08 kJ/KgF

Thermal conductivity of the solid fuel

l s

0.188 W/(m K)