Characterization of acoustically forced swirl flame dynamics

2009 ◽  
Vol 32 (2) ◽  
pp. 2893-2900 ◽  
Author(s):  
Sai Kumar Thumuluru ◽  
Tim Lieuwen
Keyword(s):  
Flame Dynamics ◽  
Swirl Flame

Detailed characterization of the dynamics of thermoacoustic pulsations in a lean premixed swirl flame

2007 ◽  
Vol 150 (1-2) ◽  
pp. 2-26 ◽  
Author(s):  
W MEIER ◽  
P WEIGAND ◽  
X DUAN ◽  
R GIEZENDANNERTHOBEN
Keyword(s):  
Detailed Characterization ◽  
Lean Premixed ◽  
Swirl Flame

scholarly journals Design of a Fluidic Actuator with Independent Frequency and Amplitude Modulation for Control of Swirl Flame Dynamics

Fluids ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 128
Author(s):  
Amrit Adhikari ◽  
Thorge Schweitzer ◽  
Finn Lückoff ◽  
Kilian Oberleithner
Keyword(s):  
Flow Control ◽  
Large Scale ◽  
Combustion Process ◽  
Precessing Vortex Core ◽  
Flame Dynamics ◽  
Efficient Combustion ◽  
Control Authority ◽  
Swirl Flame ◽  
Actuator Design ◽  
The Impact

Fluidic actuators are designed to control the oscillatory helical mode, called a precessing vortex core (PVC), which is often observed in gas turbine combustors. The PVC induces large-scale hydrodynamic coherent structures, which can considerably affect flow and flame dynamics. Therefore, appropriate control of this structure can lead to a more stable and efficient combustion process. Currently available flow control systems are designed to control the PVC in laboratory-scale setups. To further develop these systems and find an approach applicable to the industrial scale, a new actuator design based on fluidic oscillators is presented and studied in this paper. This actuator allows for independently adjusting forcing frequency and amplitude, which is necessary to effectively target the dynamics of the PVC. The functionality and flow control of this actuator design are studied based on numerical simulations and experimental measurements. To verify the flow control authority, the actuator is built into a prototype combustor test rig, which allows for investigating the impact of the actuator’s forcing on the PVC at isothermal conditions. The studies conducted in this work prove the desired functionality and flow control authority of the 3D-printed actuator. Accordingly, a two-part stainless steel design is derived for future test conditions with flame.

scholarly journals Phase-resolved characterization of vortex–flame interaction in a turbulent swirl flame

2011 ◽  
Vol 51 (4) ◽  
pp. 1153-1167 ◽  
Author(s):  
M. Stöhr ◽  
R. Sadanandan ◽  
W. Meier
Keyword(s):  
Swirl Flame

Experimental study of stratified swirl flame dynamics in a model gas turbine combustor

Energy ◽  
2020 ◽  
Vol 211 ◽  
pp. 118699
Author(s):  
Zhihao Zhang ◽  
Xiao Liu ◽  
Yaozhen Gong ◽  
Yang Yang ◽  
Zijia Tang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Turbine ◽  
Gas Turbine Combustor ◽  
Flame Dynamics ◽  
Model Gas Turbine Combustor ◽  
Swirl Flame

scholarly journals 5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 2. Analysis of swirl flame dynamics

2016 ◽  
Vol 173 ◽  
pp. 454-467 ◽  
Author(s):  
Carson D. Slabaugh ◽  
Claresta N. Dennis ◽  
Isaac Boxx ◽  
Wolfgang Meier ◽  
Robert P. Lucht
Keyword(s):  
Gas Turbine ◽  
Probe Pulse ◽  
Flame Dynamics ◽  
Swirl Flame ◽  
Turbine Model

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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