TY - JOUR
T1 - Numerical simulation of the effect of pressure fluctuation on the modulation of equivalence ratio at the fuel injection hole
AU - Kim, Hyeon Jun
AU - Hong, Jung Goo
AU - Shin, Hyun Dong
PY - 2007/3
Y1 - 2007/3
N2 - In gas turbine technology, the flame stability is inherently greater in conventional diffusion type combustion over a wider range fuel to oxidizer ratio. However, premixed type combustion which has narrow flame stability region, is widely used due to environmental reason. It has been observed in experiments that combustion instability of low frequency (∼10Hz) results from the modulation of equivalence ratio at fuel injection hole when a pressure fluctuation propagates upwards along the channel of the burner under an unchoked fuel flow condition. In this study, a commercial program was used to determine how the fuel flow rate changed with respect to the pressure, velocity of the fuel flow and the mass fraction in a choked and an unchoked condition. The calculation focuses on the upstream of the dump plane to know how the forced pressure with the fuel injection conditions affects the modulation of the equivalence ratio. Therefore, it is found that pressure fluctuation leads to oscillation of mass flow rate and then results in equivalence ratio modulation under the unchoked fuel flow condition.
AB - In gas turbine technology, the flame stability is inherently greater in conventional diffusion type combustion over a wider range fuel to oxidizer ratio. However, premixed type combustion which has narrow flame stability region, is widely used due to environmental reason. It has been observed in experiments that combustion instability of low frequency (∼10Hz) results from the modulation of equivalence ratio at fuel injection hole when a pressure fluctuation propagates upwards along the channel of the burner under an unchoked fuel flow condition. In this study, a commercial program was used to determine how the fuel flow rate changed with respect to the pressure, velocity of the fuel flow and the mass fraction in a choked and an unchoked condition. The calculation focuses on the upstream of the dump plane to know how the forced pressure with the fuel injection conditions affects the modulation of the equivalence ratio. Therefore, it is found that pressure fluctuation leads to oscillation of mass flow rate and then results in equivalence ratio modulation under the unchoked fuel flow condition.
KW - Equivalence ratio fluctuation
KW - Numerical simulation
KW - Pressure fluctuation
UR - http://www.scopus.com/inward/record.url?scp=34250702051&partnerID=8YFLogxK
U2 - 10.3795/KSME-B.2007.31.3.292
DO - 10.3795/KSME-B.2007.31.3.292
M3 - Article
AN - SCOPUS:34250702051
SN - 1226-4881
VL - 31
SP - 292
EP - 299
JO - Transactions of the Korean Society of Mechanical Engineers, B
JF - Transactions of the Korean Society of Mechanical Engineers, B
IS - 3
ER -