scholarly journals Development and Verification of the New Simplified Mechanism for CH4/O2/CO2 Laminar Premixed Flame under High Pressure

ACS Omega ◽  
2021 ◽  
Author(s):  
Ying Chen ◽  
Jingfu Wang ◽  
Conghao Li ◽  
Xiaolei Zhang
Keyword(s):  
High Pressure ◽  
Premixed Flame ◽  
Simplified Mechanism

Turbulent premixed flame characteristics of a CO/H2/O2 mixture highly diluted with CO2 in a high-pressure environment

2013 ◽  
Vol 34 (1) ◽  
pp. 1437-1445 ◽  
Author(s):  
Hideaki Kobayashi ◽  
Yuki Otawara ◽  
Jinhua Wang ◽  
Futoshi Matsuno ◽  
Yasuhiro Ogami ◽  
...  
Keyword(s):  
High Pressure ◽  
Premixed Flame ◽  
Turbulent Premixed Flame ◽  
High Pressure Environment ◽  
Turbulent Premixed

scholarly journals Numerical simulation of high pressure burner with partially premixed flame

2011 ◽  
Vol 4 (4) ◽  
pp. 89-103
Author(s):  
Juan-Camilo Lezcano-Benítez ◽  
Daniel Correa-Restrepo ◽  
Andrés-Adolfo Amell-Arrieta ◽  
Francisco-Javier Cadavid-Sierra
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Reaction Mechanism ◽  
Premixed Flame ◽  
3D Simulation ◽  
Finite Rate ◽  
Dissipation Model ◽  
Partially Premixed Flame ◽  
Secondary Air ◽  
2D And 3D

In this paper we present the results of a 2D‑axisymmetric parametric study which simulates an atmospheric premixed burner with flame at high pressure, in which methane is burned. A total of 9 simulations are performed with different regulators openings of primary and secondary air. Also, it provides a 3D simulation in which entry conditions are the profiles obtained in a 2D‑axisymmetric simulation, with the intention to note that differences are obtained between 2D and 3D simulation. The simulations are performed using the standard k-ε model for turbulence, P1 model for radiation and the Finite Rate/Eddy Dissipation model with a simplified 2-step reaction mechanism for combustion. We conclude that when the secondary air regulator is closed, combustion is incomplete. Also, the results of 2D‑axisymmetric are a good approximation in regards to 3D results.

A223 Turbulent Premixed Flame Structure of Propanol Isomers in a High-pressure Environment

2013 ◽  
Vol 2013 (0) ◽  
pp. 311-312
Author(s):  
Tomohiro Uchida ◽  
Shungo Souyoshi ◽  
Taku Kudo ◽  
Akihiro Hayakawa ◽  
Hideaki Kobayashi ◽  
...  
Keyword(s):  
High Pressure ◽  
Flame Structure ◽  
Premixed Flame ◽  
Turbulent Premixed Flame ◽  
High Pressure Environment ◽  
Turbulent Premixed

scholarly journals Experimental Research of High-Pressure Methane Pulse Jet and Premixed Ignition Combustion Performance of a Direct Injection Injector

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1977
Author(s):  
Shenggang Guo ◽  
Yan Lei ◽  
Xiaofeng Wang ◽  
Tao Qiu ◽  
Bin Pang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Efficiency ◽  
Fuel Injection ◽  
Direct Injection ◽  
Injection Pressure ◽  
Spherical Shape ◽  
Premixed Flame ◽  
Stage Ii ◽  
Flame Velocity ◽  
Equivalent Radius

Natural gas (NG) direct injection (DI) technology benefits the engine with high efficiency and clean emissions, and the high-pressure gas fuel injection process causes crucial effects on the combustion. This study presents an optical experimental investigation on the high-pressure methane single-hole direct injection and premixed ignition combustion based on a visualization cuboid constant volume bomb (CVB) test rig. The experimental results show that the methane jet process is divided into two stages. The methane gas jet travels at a faster speed during the unstable stage I than that during the stable stage II. The injection pressure causes more influence on both the jet penetration distance and the jet cone area during stage II. The methane jet premixed flame is a stable flame with a nearly spherical shape, and its equivalent radius linearly increases. The methane jet premixed flame area also increases while the flame stretch rate declines. The methane jet premixed flame velocity rises as both the standing time and equivalent ratio increase. The methane jet premixed flame is a partial premixed flame, and the peak of the methane jet premixed flame occurs at greater equivalence ratio ϕ, i.e., ϕ > 2. As the injection pressure rises, the jet premixed flame equivalent radius increases, and the flame velocity linearly increases. The higher the methane injection pressure, the faster the jet premixed flame velocity.

scholarly journals Visualization and Fractal Analysis of High Pressure Turbulent Premixed Flame using Laser Tomography

1994 ◽  
Vol 14 (Supplement2) ◽  
pp. 173-176
Author(s):  
Takashi TAMURA ◽  
Teppei NAKASHIMA ◽  
Hideaki KOBAYASHI ◽  
Takashi NIIOKA
Keyword(s):  
High Pressure ◽  
Fractal Analysis ◽  
Premixed Flame ◽  
Turbulent Premixed Flame ◽  
Laser Tomography ◽  
Turbulent Premixed

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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