Analyzing the Impact Discharge Type and Power Loadings have on Ignition Kernel Development in a Reactive Flow

2021 ◽  
Author(s):  
Katherine C. Opacich ◽  
Joshua S. Heyne ◽  
Logan Scholla ◽  
Timothy Ombrello ◽  
Joshua A. Gray ◽  
...  
Keyword(s):  
Reactive Flow ◽  
Kernel Development ◽  
The Impact ◽  
Ignition Kernel

scholarly journals Response of a swirl flame to inertial waves

2017 ◽  
Vol 10 (4) ◽  
pp. 277-286 ◽  
Author(s):  
Alp Albayrak ◽  
Deniz A Bezgin ◽  
Wolfgang Polifke
Keyword(s):  
Steady State ◽  
Impulse Response ◽  
Finite Impulse Response ◽  
Reactive Flow ◽  
Inertial Waves ◽  
Mean Flow ◽  
Flow Equations ◽  
Flame Response ◽  
Inertial Wave ◽  
The Impact

Acoustic waves passing through a swirler generate inertial waves in rotating flow. In the present study, the response of a premixed flame to an inertial wave is scrutinized, with emphasis on the fundamental fluid-dynamic and flame-kinematic interaction mechanism. The analysis relies on linearized reactive flow equations, with a two-part solution strategy implemented in a finite element framework: Firstly, the steady state, low-Mach number, Navier–Stokes equations with Arrhenius type one-step reaction mechanism are solved by Newton’s method. The flame impulse response is then computed by transient solution of the analytically linearized reactive flow equations in the time domain, with mean flow quantities provided by the steady-state solution. The corresponding flame transfer function is retrieved by fitting a finite impulse response model. This approach is validated against experiments for a perfectly premixed, lean, methane-air Bunsen flame, and then applied to a laminar swirling flame. This academic case serves to investigate in a generic manner the impact of an inertial wave on the flame response. The structure of the inertial wave is characterized by modal decomposition. It is shown that axial and radial velocity fluctuations related to the eigenmodes of the inertial wave dominate the flame front modulations. The dispersive nature of the eigenmodes plays an important role in the flame response.

scholarly journals 4D multi-scale imaging of reactive flow in carbonates: Assessing the impact of heterogeneity on dissolution regimes using streamlines at multiple length scales

2018 ◽  
Vol 481 ◽  
pp. 27-37 ◽  
Author(s):  
H.P. Menke ◽  
C.A. Reynolds ◽  
M.G. Andrew ◽  
J.P. Pereira Nunes ◽  
B. Bijeljic ◽  
...  
Keyword(s):  
Reactive Flow ◽  
Length Scales ◽  
Multi Scale ◽  
Multiple Length Scales ◽  
The Impact

Large eddy simulation of auto-ignition kernel development of transient methane jet in hot co-flow

2020 ◽  
Vol 215 ◽  
pp. 342-351 ◽  
Author(s):  
Bing Liu ◽  
Jian An ◽  
Fei Qin ◽  
Rui Li ◽  
Guo-Qiang He ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Kernel Development ◽  
Eddy Simulation ◽  
Auto Ignition ◽  
Large Eddy ◽  
Ignition Kernel

Chemically Reactive Flow of Hot Combustion Gases in an Aircraft Turbo-Jet Engine

1997 ◽  
Author(s):  
Th. Godin ◽  
S. Harvey ◽  
P. Stouffs
Keyword(s):  
Gas Turbines ◽  
Pollutant Emission ◽  
Reactive Flow ◽  
Jet Engine ◽  
Combustion Gases ◽  
Turbine Inlet ◽  
Temperature State ◽  
Specific Thrust ◽  
Overall Efficiency ◽  
The Impact

Current progress in gas turbine performance is achieved mainly by increasing the turbine inlet temperature. State-of-the-art military aircraft gas turbines operate with turbine inlet temperatures exceeding 2000 K, and future development plans call for even higher temperature levels. At such high temperatures, the hot combustion gases can no longer be considered as chemically inert, and it becomes important to account for the chemically reactive nature of the expanding flow. In this paper, the authors present a one-dimensional model of the chemically reactive flow through the first turbine stage of an aircraft turbo-jet engine. The model is used to study the impact of chemical reactivity on pollutant emission characteristics and engine performance (i.e., overall efficiency and specific thrust). Three different flight conditions are considered: sea-level static operation (take-off), subsonic cruising at 10000 meters altitude, and supersonic flight at 20000 meters altitude. The results of this study show that typical flight conditions and operating parameters of turbo-jet engines produce high pollutant emission levels and decrease overall efficiency and specific thrust.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

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