investigation of a prototype industrial gas turbine combustor using ...

2. Gas Turbine Combustor
Figure 2.6: Variation of recirculated mass flow with swirl number,
adapted from Syred and Beér [17]. Straight exit: ◦ Martur and Mac-
Callum [24], △ Chigier and Beér [25], ♦ Syred, Chigier and Beér [26].
Diverging angle (γ): • γ=24 ◦ Chigier and Gilbert [27], γ=35 ◦ Dvorak
[17], γ=21.5 ◦ and 31.5 ◦ Smithson [28], γ=25 ◦ Sigfrid et al. [23].
proportional to each other.
θ = P in 1.75A
ref Dref 0.75e
T in
300
, (2.4)
ṁ
The combustor loading factor is based on empirical work collected by
Walsh and Fletcher [12] and the θ factor has been derived from combustor
efficiency [14, 29]. Lefebvre assumed that the combustor efficiency can be
calculated by assuming that the combustion heat release is proportional
to the area of the flame, the temperature increase and the turbulent flame
speed (2.5).
14
η comb. = ∆H comb.
H F
= ρ gA f S T c P ∆T
qṁ A H
, (2.5)