TY - JOUR
T1 - Nozzle admittance and damping analysis using the LEE method
AU - Mu-Xin, Wang
AU - Pei-Jin, Liu
AU - Wen-Jing, Yang
AU - Xiang-Geng, Wei
PY - 2015
Y1 - 2015
N2 - The nozzle admittance is very important in the theoretical analysis of nozzle damping in combustion instability. The linearized Euler equations (LEE) are used to determine the nozzle admittance with consideration of the mean flow properties. The acoustic energy flux through the nozzle is calculated to evaluate the nozzle damping upon longitudinal oscillation modes. Then the parametric study, involving the nozzle convergent geometry, convergent half angle and nozzle size, is carried out. It is shown that the imaginary part of the nozzle admittance plays a non-negligible role in the determination of the nozzle damping. Under the conditions considered in this work (f∗ = 1,000 Hz, de∗ = 0.18 m), the acoustic energy flux released from the nozzle with a 30o convergent half angle is highest (30°:6.0 × 104kgs- 3, 45o:5.2 × 104kgs-3, 60°: 4.9 × 104kgs-3). The change of nozzle convergent geometry is more sensitive for the large size nozzle to increase the nozzle damping.
AB - The nozzle admittance is very important in the theoretical analysis of nozzle damping in combustion instability. The linearized Euler equations (LEE) are used to determine the nozzle admittance with consideration of the mean flow properties. The acoustic energy flux through the nozzle is calculated to evaluate the nozzle damping upon longitudinal oscillation modes. Then the parametric study, involving the nozzle convergent geometry, convergent half angle and nozzle size, is carried out. It is shown that the imaginary part of the nozzle admittance plays a non-negligible role in the determination of the nozzle damping. Under the conditions considered in this work (f∗ = 1,000 Hz, de∗ = 0.18 m), the acoustic energy flux released from the nozzle with a 30o convergent half angle is highest (30°:6.0 × 104kgs- 3, 45o:5.2 × 104kgs-3, 60°: 4.9 × 104kgs-3). The change of nozzle convergent geometry is more sensitive for the large size nozzle to increase the nozzle damping.
KW - Combustion instability
KW - Linearized euler equations
KW - Nozzle admittance
KW - Nozzle damping
UR - http://www.scopus.com/inward/record.url?scp=84989257402&partnerID=8YFLogxK
U2 - 10.1515/tjj-2015-0050
DO - 10.1515/tjj-2015-0050
M3 - 文章
AN - SCOPUS:84989257402
SN - 0334-0082
VL - 2015
SP - 1
EP - 9
JO - International Journal of Turbo and Jet Engines
JF - International Journal of Turbo and Jet Engines
ER -