Experimental Study of Combustion Instabilities in a Single-Element Coaxial Swirl Injector

2005 ◽  
Author(s):  
Kevin Miller ◽  
James Sisco ◽  
Nicholas Nugent ◽  
William Anderson
Keyword(s):  
Experimental Study ◽  
Single Element ◽  
Combustion Instabilities ◽  
Swirl Injector

Numerical Investigation of Combustion Instabilities in a Single Element Lean Direct Inject (LDI) Combustor Using Flamelet Based Approaches

2019 ◽  
Author(s):  
Saurabh Patwardhan ◽  
Pravin Nakod ◽  
Stefano Orsino ◽  
Carlo Arguinzoni
Keyword(s):  
Experimental Data ◽  
Equivalence Ratio ◽  
Single Element ◽  
Pressure Amplitude ◽  
Combustion Instabilities ◽  
Time Step ◽  
Impedance Boundary ◽  
Combustion Models ◽  
Flamelet Generated Manifold ◽  
Simulation Results

Abstract In this paper, high-fidelity large eddy simulations (LES) along with flamelet based combustion models are assessed to predict combustion dynamics in low-emissions gas turbine combustor. A model configuration of a single element lean-direct-injection (LDI) combustor from Purdue University [1] is used for the validation of simulation results. Two combustion models based on the flamelet concept, i.e., steady diffusion flamelet (SDF) model and flamelet generated manifold (FGM) model are employed to predict combustion instabilities. Simulations are carried out for two equivalence ratios of φ = 0.6, and 0.4 and the results in the form of mode shapes, peak to peak pressure amplitude and power spectrum density (PSD) are compared with the experimental data of Huang et al. [1]. The effect of variation in the time step size for transient simulations is also studied. The time step sizes corresponding to Acoustic Courant numbers of 4, 8 and 16 are tested. Further, two numerical solver options, i.e., pressure based segregated solver and pressure based coupled solver are used in understanding their effect on the solution convergence regarding the number of time steps required to reach the limit cycle of the pressure oscillations. An additional test for reducing the overall simulation time is explored using a truncated (half) calculation domain and applying an appropriate acoustic impedance boundary condition at the truncated location. The simulation results from this test for the equivalence ratio of φ = 0.6 are compared with the simulation results from the corresponding full domain test. Overall, the simulation results compare well with the experimental data and trends are captured accurately. A clear dominant acoustic mode of 4L is observed for the equivalence ratio of 0.6 that compares well with the experimental data. For the equivalence ratio of 0.4, simulation results show that there is no dominant frequency and the energy is distributed among the first five modes. It is consistent with the observations in the experiments. Both combustion models (SDF and FGM) used in this study capture the combustion instabilities accurately. It builds confidence in flamelet based combustion models for the use in combustion instability modeling which is traditionally done using finite rate chemistry models based on reduced kinetics.

Low-frequency combustion instabilities of an airblast swirl injector in a liquid-fuel combustor

2018 ◽  
Vol 196 ◽  
pp. 424-438 ◽  
Author(s):  
Byeonguk Ahn ◽  
Jeongjae Lee ◽  
Seungchai Jung ◽  
Kyu Tae Kim
Keyword(s):  
Liquid Fuel ◽  
Low Frequency ◽  
Combustion Instabilities ◽  
Swirl Injector

An experimental study of combustion dynamics of a premixed swirl injector

1998 ◽  
Vol 27 (2) ◽  
pp. 1849-1856 ◽  
Author(s):  
J.C. Broda ◽  
S. Seo ◽  
R.J. Santoro ◽  
G. Shirhattikar ◽  
V. Yang
Keyword(s):  
Experimental Study ◽  
Combustion Dynamics ◽  
Swirl Injector

scholarly journals Experimental Study on Simplex Swirl Injector Dynamics with Varying Geometry

2011 ◽  
Vol 12 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Yun-Jae Chung ◽  
Tae-Ock Khil ◽  
Jung-Soo Yoon ◽  
Young-Bin Yoon ◽  
V. Bazarov
Keyword(s):  
Experimental Study ◽  
Swirl Injector ◽  
Injector Dynamics

Experimental Investigation of Self-Excited Combustion Instabilities in a Lean, Premixed, Gas Turbine Combustor at High Pressure

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Timo Buschhagen ◽  
Rohan Gejji ◽  
John Philo ◽  
Lucky Tran ◽  
J. Enrique Portillo Bilbao ◽  
...  
Keyword(s):  
High Pressure ◽  
Combustion Chamber ◽  
Operating Conditions ◽  
Chamber Pressure ◽  
Dynamic Mode ◽  
Single Element ◽  
Combustion Instabilities ◽  
Wide Range ◽  
Lower Amplitude ◽  
Lean Premixed

Self-excited combustion instabilities in a high pressure, single-element, lean, premixed, natural gas (NG) dump-combustor are investigated. The combustor is designed for optical access and instrumented with high frequency pressure transducers at multiple axial locations. A parametric survey of operating conditions including inlet air temperature and equivalence ratio has been performed, resulting in a wide range of pressure fluctuation amplitudes (p′) of the mean chamber pressure (pCH). Two representative cases, flames A and B with p′/pCH=23% and p′/pCH=12%, respectively, both presenting self-excited instabilities at the fundamental longitudinal (1L) mode of the combustion chamber, are discussed to study the coupling mechanism between flame-vortex interactions and the acoustic field in the chamber. 10 kHz OH*-chemiluminescence imaging was performed to obtain a map of the global heat release distribution. Phase conditioned and Rayleigh index analysis as well as dynamic mode decomposition (DMD) is performed to highlight the contrasting mechanisms that lead to the two distinct instability regimes. Flame interactions with shear layer vortex structures downstream of the backward-facing step of the combustion chamber are found to augment the instability magnitude. Flame A engages strongly in this coupling, whereas flame B is less affected and establishes a lower amplitude limit cycle.

Experimental Study Swirl Injector Dynamic Response Using a Hydromechanical Pulsator

2012 ◽  
Vol 28 (3) ◽  
pp. 585-595 ◽  
Author(s):  
Benjamin Ahn ◽  
Maksud Ismailov ◽  
Stephen D. Heister
Keyword(s):  
Experimental Study ◽  
Dynamic Response ◽  
Swirl Injector

An experimental study on the spray characteristics of a dual-orifice type swirl injector at low fuel temperatures

2004 ◽  
Vol 18 (7) ◽  
pp. 1187-1195 ◽  
Author(s):  
Byung Sung Park ◽  
Ho Young Kim ◽  
Yongchan Kim ◽  
Jin Taek Chung
Keyword(s):  
Experimental Study ◽  
Spray Characteristics ◽  
Swirl Injector
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