Combustor Modeling and Design with Uncertainties

Xiong, Yan; Dede, Mehmet; Moscinski, Mike

doi:10.2514/6.2007-1871

Cited by 1 publication

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the homogenisation of fuel-air mixture has a strongly adverse effect on combustion lean stability, leading to vibratory combustor failure [6]. This phenomenon may have impacts on combustor integrity when the sustained instability levels excite the acoustical modes of the surrounding structure, thus leading to significant pressure oscillations; these oscillations (with frequencies ranging from hundreds to thousands Hertz) can force the resonance of some structural modes up to the crisis of the entire system [7][8][9][10][11]; hence the need to study the structural dynamic of the combustor and the interaction between elastic, thermal and acoustic phenomena [12][13][14]. An accurate characterization of combustor dynamics, through its modal parameters, is mandatory for such purpose.…”

Section: Introductionmentioning

confidence: 99%

A Sensitivity Analysis on the Influence of the External Constraints on the Dynamic Behaviour of a Low Pollutant Emissions Aircraft Combustor-Rig

Amoroso

Fenza

Petrone

et al. 2016

Archive of Mechanical Engineering

View full text Add to dashboard Cite

The need to reduce pollutant emissions leads the engineers to design new aeronautic combustors characterized by lean burn at relatively low temperatures. This requirement can easily cause flame instability phenomena and consequent pressure pulsations which may seriously damage combustor's structure and/or compromise its fatigue life.Hence the need to study the combustor's structural dynamics and the interaction between elastic, thermal and acoustic phenomena. Finite element method represent a largely used and fairly reliable tool to address these studies; on the other hand, the idealization process may bring to results quite far from the reality whereas too simplifying assumptions are made.Constraints modelling represent a key-issue for all dynamic FE analyses; a wrong simulation of the constraints may indeed compromise entire analyses although running on very accurate and mesh-refined structural models.In this paper, a probabilistic approach to characterize the influence of external constraints on the modal behaviour of an aircraft combustor-rig is presented. The finite element model validation was performed at first by comparing numerical and experimental results for the free-free condition (no constraints). Once the model was validated, the effect of constraints elasticity on natural frequencies was investigated by means of a probabilistic design simulation (PDS); referring to a specific tool developed in the ANSYS®software, a preliminary statistical analysis was at performed via Monte-Carlo Simulation (MCS) method. The results were then correlated with the experimental ones via Response Surface Method (RSM). Φ P -vector of modal displacements coming from source P (source being theoretical analysis or experimental measurement)Φ X -vector of modal displacements coming from source X (source being theoretical analysis or experimental measurement)

show abstract