Analytical study of superadiabatic small-scale combustors with a two-step chain-branching chemistry model: Lean burning below the flammability limit

2021 ◽  
pp. 111731
Author(s):  
Javier Bosch ◽  
Daniel Fernández-Galisteo ◽  
Carmen Jiménez ◽  
Vadim N. Kurdyumov
Keyword(s):  
Analytical Study ◽  
Small Scale ◽  
Flammability Limit ◽  
Chain Branching

Dynamics and Stability Limits of Syngas Combustion in a Backward-Facing Step Combustor

2007 ◽  
Author(s):  
Raymond L. Speth ◽  
H. Murat Altay ◽  
Ahmed F. Ghoniem
Keyword(s):  
High Speed ◽  
Vortex Method ◽  
Operating Mode ◽  
Operating Conditions ◽  
Video Data ◽  
Stable Region ◽  
Small Scale ◽  
Flammability Limit ◽  
Combustion Dynamics ◽  
Operating Modes

The stability bands and combustion dynamics of syngas under different operating conditions and fuel compositions are investigated. Pressure measurements and high-speed video data are used to distinguish three operating modes. A stable region near the lean flammability limit is characterized by the shedding of small-scale vortices in the shear-layer. A quasistable region is present at intermediate equivalence ratios. At high equivalence ratios, we observe an unstable operating mode characterized by the periodic interaction between a large vortex and the flame. As the amount of hydrogen in the fuel is increased, the lean flammability limit is extended and transitions between operating regimes moves to lower equivalence ratios. Numerical simulations performed using a vortex method correspond to the experimental measurements and confirm the observed instability mechanism.

Techno-Economic Analysis and Comparative Evaluation of the Use of Gas Turbines and Reciprocating Engines in Small Scale Applications of Industrial Cogeneration

2007 ◽  
Author(s):  
Livia Arcioni ◽  
Alessandro Corradetti ◽  
Umberto Desideri ◽  
Stefania Proietti ◽  
Paolo Pogliano ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Analytical Study ◽  
Combustion Engine ◽  
Electrical Power ◽  
Payback Period ◽  
Economic Feasibility ◽  
Small Scale ◽  
Simplified Approach ◽  
Made In

This paper presents the results of a research made by University of Perugia in collaboration with Energia Spa (now Sorgenia Spa). Various analysis have been carried out to determine the techno-economic feasibility of industrial CHP plants. Due to the particular field of application, the installation of a gas turbine has been considered and compared to the traditional internal combustion engine (ICE), both being characterized by an electrical power lower than 2 MW. The feasibility study has been made in two different way: an analytical study and a simplified approach elaborated to have a first approach formula for the installation of CHP Plant. The results confirmed that IC is more convenient, giving lower payback period for the investment for this typology of installation. We present also the sensitivity analysis to determine the minimum value over that the installation of gas turbine can become convenient.

scholarly journals An Analytical Study of the Small Scale Common Workshop in Japan and Its Issues to Korea

2008 ◽  
Vol 18 (2) ◽  
pp. 5-34
Author(s):  
이채식 ◽  
김명식 ◽  
이은영 ◽  
조원일
Keyword(s):  
Analytical Study ◽  
Small Scale

Reasons to strike first

2019 ◽  
Vol 42 ◽  
Author(s):  
William Buckner ◽  
Luke Glowacki
Keyword(s):  
Intergroup Conflict ◽  
Small Scale

Abstract De Dreu and Gross predict that attackers will have more difficulty winning conflicts than defenders. As their analysis is presumed to capture the dynamics of decentralized conflict, we consider how their framework compares with ethnographic evidence from small-scale societies, as well as chimpanzee patterns of intergroup conflict. In these contexts, attackers have significantly more success in conflict than predicted by De Dreu and Gross's model. We discuss the possible reasons for this disparity.

Exploring Coronal Structures with SOHO

2000 ◽  
Vol 179 ◽  
pp. 403-406
Author(s):  
M. Karovska ◽  
B. Wood ◽  
J. Chen ◽  
J. Cook ◽  
R. Howard
Keyword(s):  
Solar Corona ◽  
Image Enhancement ◽  
Coronal Mass Ejections ◽  
Dynamical Evolution ◽  
Small Scale ◽  
Low Contrast ◽  
Contrast Structures ◽  
Scale Structures ◽  
Small Scale Structures ◽  
Coronal Structures

AbstractWe applied advanced image enhancement techniques to explore in detail the characteristics of the small-scale structures and/or the low contrast structures in several Coronal Mass Ejections (CMEs) observed by SOHO. We highlight here the results from our studies of the morphology and dynamical evolution of CME structures in the solar corona using two instruments on board SOHO: LASCO and EIT.

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