Search Results - "Lieuwen, Tim"

Lean blowoff of bluff body stabilized flames: Scaling and dynamics by Shanbhogue, Santosh J., Husain, Sajjad, Lieuwen, Tim

“…This paper overviews the dynamics of bluff body stabilized flames and describes the phenomenology of the blowoff process. The first section of the paper…”
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Characterization of acoustically forced swirl flame dynamics by Thumuluru, Sai Kumar, Lieuwen, Tim

“…Lean premixed combustors are highly susceptible to combustion instabilities, caused by the coupling between heat release fluctuations and combustor acoustics…”
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Effect of turbulence–chemistry interactions on chemical pathways for turbulent hydrogen–air premixed flames by Dasgupta, Debolina, Sun, Wenting, Day, Marc, Lieuwen, Tim

“…This paper considers the kinetic pathways of hydrogen oxidation in turbulent, premixed H2–air flames. It assesses the relative roles of different reaction…”
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Stationary gas turbine combustion: Technology needs and policy considerations by Lieuwen, Tim, Chang, Michael, Amato, Alberto

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Time-averaged characteristics of a reacting fuel jet in vitiated cross-flow by Sullivan, Ryan, Wilde, Benjamin, Noble, David R., Seitzman, Jerry M., Lieuwen, Tim C.

“…This paper describes an experimental study of reacting jets in a high-temperature (1775K) vitiated crossflow at 6atm. We present an extensive data set based on…”
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Topology and burning rates of turbulent, lean, H2/air flames by Amato, Alberto, Day, Marcus, Cheng, Robert K., Bell, John, Dasgupta, Debolina, Lieuwen, Tim

“…Improved understanding of turbulent flames characterized by negative consumption speed-based Markstein lengths is necessary to develop better models for…”
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Flame-sheet dynamics of bluff-body stabilized flames during longitudinal acoustic forcing by Shanbhogue, Santosh, Shin, Dong-Hyuk, Hemchandra, Santosh, Plaks, Dmitriy, Lieuwen, Tim

“…Bluff-body stabilized flames are susceptible to combustion instabilities due to interactions between acoustics, vortical disturbances, and the flame. In order…”
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Response of turbulent premixed flames to harmonic acoustic forcing by Preetham, Santosh H., Lieuwen, Tim C.

“…The objective of this paper is to compare the response of laminar and turbulent premixed flames to harmonic forcing. This work is motivated by the growing body…”
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Statistical characteristics of pressure oscillations in a premixed combustor by Lieuwen, Tim C.

“…This paper describes an investigation of the statistical characteristics of self-excited and noise-driven pressure oscillations in a premixed combustor. This…”
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Exact statistics for linear time delayed oscillators subjected to Gaussian excitation by Crawford III, Jack H., Verriest, Erik I., Lieuwen, Tim C.

“…Large classes of stochastic systems of interest to acoustics and vibrations have time delays. The presence of these time delays hinders efforts to provide…”
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Direct combustion noise: Nearfield and non-compactness influences on pressure–heat release coherence by Ha, Sungyoung, Lieuwen, Tim

“…There are several mechanisms through which turbulent flames produce sound. In low Mach number, unconfined flows, direct combustion noise – i.e., unsteady gas…”
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Premixed flame response to helical disturbances: Mean flame non-axisymmetry effects by Acharya, Vishal, Lieuwen, Tim

“…A key component of the thermoacoustic instability feedback mechanism is the excitation of hydrodynamic flow disturbances by narrowband acoustic fluctuations…”
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Disturbance Field Characteristics of a Transversely Excited Burner by O'Connor, Jacqueline, Lieuwen, Tim

“…Transverse acoustic instabilities in premixed, swirl-stabilized flames are an important problem in low NO x combustors. Transverse excitation of swirling…”
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Near-lean blowoff dynamics in a liquid fueled combustor by Rock, Nicholas, Emerson, Ben, Seitzman, Jerry, Lieuwen, Tim

“…This paper describes an analysis of the near-lean blow off (LBO) dynamics of spray flames, including the influence of fuel composition upon these dynamics. It…”
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Acoustic near-field characteristics of a conical, premixed flame by Lee, Doh-Hyoung, Lieuwen, Tim C

“…The occurrence of self-excited pressure oscillations routinely plagues the development of combustion systems. These oscillations are often driven by…”
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Acoustic-vortex interaction in reacting wakes near the global hydrodynamic stability limit by Emerson, Benjamin, Lieuwen, Tim

“…This study experimentally characterizes the effect of acoustics on the vortex dynamics in reacting wakes. This work is motivated by the problem of combustion…”
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Shear Layer Dynamics in a Reacting Jet in Crossflow by Nair, Vedanth, Wilde, Benjamin, Emerson, Benjamin, Lieuwen, Tim

“…This study explores the effect of heat release on the growth of the shear layer vortical structures in a reacting jet in crossflow. Jets composed of mixtures…”
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Role of induced axial acoustics in transverse acoustic flame response by Smith, Travis, Emerson, Benjamin, Proscia, William, Lieuwen, Tim

“…This paper addresses the mechanisms through which transverse acoustic oscillations excite unsteady heat release. Forced and self-excited transverse acoustic…”
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Velocity and stretch characteristics at the leading edge of an aerodynamically stabilized flame by Chterev, Ianko, Emerson, Ben, Lieuwen, Tim

“…High swirl flows with vortex breakdown are frequently used to create recirculating flow regions for flame stabilization. This paper experimentally…”
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Nonlinear kinematic response of premixed flames to harmonic velocity disturbances by Lieuwen, Tim

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