Characterization of a Multi-Injector GOX/CH4 Combustion Chamber

2016 ◽  
Author(s):  
Simona Silvestri ◽  
Maria Palma Celano ◽  
Gregor Schlieben ◽  
Oskar J. Haidn
Keyword(s):  
Combustion Chamber ◽  
Ch4 Combustion

Characterization of Tumble Motion in SI Engines: A New Parameter

2002 ◽  
Author(s):  
Pramod S. Mehta ◽  
M. Achuth
Keyword(s):  
Life Span ◽  
Combustion Chamber ◽  
Flow Analysis ◽  
Combustion Process ◽  
Operating Conditions ◽  
Mean Flow ◽  
Detailed Mechanism ◽  
Engine Combustion ◽  
Si Engines

A well-timed turbulence due to tumble in SI engines is found to be of substantial benefit to the engine combustion process. A mean flow analysis of tumble motion in conjunction with k-ε turbulence model has been developed to provide a detailed mechanism for turbulence enhancement due to tumble. Considering that the tumble phenomenon is highly geometry dependant, an attempt is made to relate tumble-generated turbulence to the parameters relating to intake conditions and combustion chamber geometry. Finally, a new parameter ‘vortex life span’ has been proposed to characterize tumble and its turbulence, which globally encompasses intake and combustion chamber related features. The sensitivity of this parameter is demonstrated at various operating conditions. It is found that the ‘vortex life span’ has an inverse relationship with commonly measured BDC tumble ratio and is more sensitive to the chamber geometry effects.

scholarly journals Statistical Analysis of Flame Oscillation Characterization of Oxy-Fuel in Heavy Oil Boiler Using OH Planar Laser-Induced Fluorescence

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Xin Yu ◽  
Zhen Cao ◽  
JiangBo Peng ◽  
Yang Yu ◽  
Guang Chang ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Heavy Oil ◽  
Laser Induced Fluorescence ◽  
Peak Position ◽  
Flame Surface ◽  
Flame Combustion ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Flame Oscillation

The present work investigated the flame structures and oscillations of oxy-fuel combustions in a heavy oil boiler using OH planar laser-induced fluorescence imaging. Combustion instabilities, such as flame oscillation and combustion fluctuation, can assess the performance of an industrial burner in the boiler. The peak position variation in OH concentration was associated with the change of the reaction zone that corresponded with the fluctuation of the heat-release zone in the combustion chamber, which provides a valuable reference for the design of the combustion chamber. The experimental results suggest that the phenomenon of stratified flame combustion is related to the characteristic of flame oscillation. The substitution of N2 with CO2 will not significantly influence the flame oscillation frequency but increases the number of flame surface. As O2 concentration increased in the O2/CO2 atmosphere, the phenomenon of stratified flame combustion disappeared, and the flame presented an island-like structure. The bimodal oscillation of the combustion center was demonstrated by means of the probability density method; CO2 played a role in the extension of the combustion center. The combustion fluctuation of inner regions was quantitatively described; CO2 could maintain interregional stabilization to some extent. Compared with traditional measurement methods, PLIF technology has great advantages in evaluating burner performance and optimizing the design of the combustion chamber.

Experimental Characterization of a Remoting System for Dynamic Pressure Sensors

2005 ◽  
Author(s):  
Giovanni Ferrara ◽  
Lorenzo Ferrari ◽  
Gabriele Sonni
Keyword(s):  
Shock Tube ◽  
Combustion Chamber ◽  
Operating Temperature ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
Measurement Point ◽  
Experimental Characterization ◽  
Temperature Capability ◽  
Lower Operating Temperature

Concerning measurements with dynamic pressure sensors, one of the most interesting aspects is the influence of a remoting system interposed between the sensor and the measurement point. This mounting system, once correctly characterized, allows one to use the same sensor for different measurement points, reducing the total number of sensors used. In addition, in all the applications involving high temperatures (e.g. combustion chamber), a remoting system allows the use of cheaper dynamic pressure sensors with lower operating temperature capability. A remoting system for dynamic pressure sensors made up by a remoting duct, between the sensor and the measurement point, followed by a damping duct has been characterized for different tube lengths. Tests were carried out with two kinds of sources: a diaphragm-less shock tube for the first set of tests and an acoustic speaker for the second. Results are here reported and commented.

scholarly journals Soot Formation and Flame Characterization of an Aero-Engine Model Combustor Burning Ethylene at Elevated Pressure

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Klaus Peter Geigle ◽  
Redjem Hadef ◽  
Wolfgang Meier
Keyword(s):  
Combustion Chamber ◽  
Soot Formation ◽  
Thermal Power ◽  
Elevated Pressure ◽  
Main Reaction ◽  
Additional Parameter ◽  
Engine Model ◽  
Laser Induced Incandescence ◽  
Swirl Injector

Swirl-stabilized, nonpremixed ethylene/air flames were investigated at pressures up to 5 bar to study the effect of different operating parameters on soot formation and oxidation. Focus of the experiments was the establishment of a database describing well-defined flames, serving for validation of numerical simulation. Good optical access via pressure chamber windows and combustion chamber windows enables application of laser-induced incandescence to derive soot volume fractions after suitable calibration. This results in ensemble averaged, as well as instantaneous soot distributions. Beyond pressure, parameters under study were the equivalence ratio, thermal power, and amount of oxidation air. The latter could be injected radially into the combustor downstream of the main reaction zone through holes in the combustion chamber posts. Combustion air was introduced through a dual swirl injector whose two flow rates were controlled separately. The split of those air flows provided an additional parameter variation. Nominal power of the operating points was approximately 10 kW/bar leading to a maximum power of roughly 50 kW, not including oxidation air.

Acoustic characterization of combustion chambers in reciprocating engines: An application for low knocking cycles recognition

2020 ◽  
pp. 146808742098056
Author(s):  
Ricardo Novella ◽  
Benjamín Pla ◽  
Pau Bares ◽  
Irina Jiménez
Keyword(s):  
Combustion Chamber ◽  
Pressure Fluctuations ◽  
Recognition System ◽  
Turbulent Jet ◽  
Order System ◽  
Resonance Oscillation ◽  
Acoustic Response ◽  
Viscous Effects ◽  
Combustion Chambers

In this paper the acoustic response of a combustion chamber is studied by assuming different pressure field excitation. The viscous effects on the combustion chamber and the finite impedance of the walls have been modeled with a first order system, which damps the resonance oscillation created by combustion. The characterization of the acoustic response of the combustion chamber has been used to identify the source of the excitation in order to distinguish normal combustion from knock. Two engines, a conventional spark ignited (SI) and a turbulent jet ignition (TJI) engine, were used, fueled with gasoline and compressed natural gas (CNG), respectively. The pressure fluctuations in the combustion chambers are analyzed and a pattern recognition system identifies the most likely source of excitation. This new criteria for knock identification permits a more consistent differentiation between knocking and no-knocking cycles, independent on the amplitude of the phenomenon, thus allowing the improvement for knock control algorithms, specially with combustion modes which heavily excite resonance, such as turbulent jet ignition or homogeneous charge compression ignition (HCCI).

scholarly journals Soot Formation and Flame Characterization of an Aero-Engine Model Combustor Burning Ethylene at Elevated Pressure

2013 ◽  
Author(s):  
Klaus Peter Geigle ◽  
Redjem Hadef ◽  
Wolfgang Meier
Keyword(s):  
Combustion Chamber ◽  
Soot Formation ◽  
Thermal Power ◽  
Elevated Pressure ◽  
Main Reaction ◽  
Additional Parameter ◽  
Engine Model ◽  
Laser Induced Incandescence ◽  
Swirl Injector

Swirl-stabilized, non-premixed ethylene/air flames were investigated at pressures up to 5 bars to study the effect of different operating parameters on soot formation and oxidation. Focus of the experiments was the establishment of a data base describing well defined flames, serving for validation of numerical simulation. Good optical access via pressure chamber windows and combustion chamber windows enables application of laser-induced incandescence to derive soot volume fractions after suitable calibration. This results in ensemble averaged as well as instantaneous soot distributions. Beyond pressure, parameters under study were the equivalence ratio, thermal power and amount of oxidation air. Latter could be injected radially into the combustor downstream of the main reaction zone through holes in the combustion chamber posts. Combustion air was introduced through a dual swirl injector whose two flow rates were controlled separately. The split of those air flows provided an additional parameter variation. Nominal power of the operating points was approximately 10 kW/bar leading to a maximum power of roughly 50 kW, not including oxidation air.

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