Prediction of the Rate of Heat Release of an Axisymmetrical Diesel Flame in a Rapid Compression Machine

1984 ◽  
Author(s):  
Haruki Kobayashi ◽  
Takeyuki Kamimoto ◽  
Shin Matsuoka
Keyword(s):  
Heat Release ◽  
Rapid Compression Machine ◽  
Rate Of Heat Release ◽  
Rapid Compression

Study of cycle-by-cycle variations of natural gas direct injection combustion using a rapid compression machine

2003 ◽  
Vol 217 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Z Huang ◽  
S Shiga ◽  
T Ueda ◽  
H Nakamura ◽  
T Ishima ◽  
...  
Keyword(s):  
Natural Gas ◽  
Heat Release ◽  
Maximum Rate ◽  
Direct Injection ◽  
Pressure Rise ◽  
Maximum Pressure ◽  
Rapid Compression Machine ◽  
Combustion Duration ◽  
Rate Of Heat Release ◽  
Rapid Compression

Cycle-by-cycle variations of natural gas direct injection (CNG DI) combustion were studied by using a rapid compression machine. Results show that CNG DI combustion can realize high combustion stability with less cycle-by-cycle variation in the maximum pressure rise, the maximum rate of pressure rise and the maximum rate of heat release at the given equivalence ratios. Mixture stratification and fast flame propagation with the aid of turbulence produced by the high speed fuel jet are considered to be responsible for these behaviours. Cycle-by-cycle variations in combustion durations and combustion products present higher magnitudes than those of maximum pressure rise and maximum rate of heat release. Cycle-by-cycle variations of CO and unburned CH4 show an interdependence with the variation of the late combustion duration, and the variation of NO x shows an interdependence with the variation of the rapid combustion duration. Cycle-by-cycle variations are found to be insensitive to the equivalence ratios in CNG DI combustion.

scholarly journals Combustion Thermodynamics of Ethanol, n-Heptane, and n-Butanol in a Rapid Compression Machine with a Dual Direct Injection (DDI) Supply System

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2729
Author(s):  
Ireneusz Pielecha ◽  
Sławomir Wierzbicki ◽  
Maciej Sidorowicz ◽  
Dariusz Pietras
Keyword(s):  
Heat Release ◽  
Combustion Chamber ◽  
Internal Combustion Engines ◽  
Direct Injection ◽  
Combustion Process ◽  
Combustion Efficiency ◽  
Injection System ◽  
Rapid Compression Machine ◽  
Process Indicators ◽  
Rapid Compression

The development of internal combustion engines involves various new solutions, one of which is the use of dual-fuel systems. The diversity of technological solutions being developed determines the efficiency of such systems, as well as the possibility of reducing the emission of carbon dioxide and exhaust components into the atmosphere. An innovative double direct injection system was used as a method for forming a mixture in the combustion chamber. The tests were carried out with the use of gasoline, ethanol, n-heptane, and n-butanol during combustion in a model test engine—the rapid compression machine (RCM). The analyzed combustion process indicators included the cylinder pressure, pressure increase rate, heat release rate, and heat release value. Optical tests of the combustion process made it possible to analyze the flame development in the observed area of the combustion chamber. The conducted research and analyses resulted in the observation that it is possible to control the excess air ratio in the direct vicinity of the spark plug just before ignition. Such possibilities occur as a result of the properties of the injected fuels, which include different amounts of air required for their stoichiometric combustion. The studies of the combustion process have shown that the combustible mixtures consisting of gasoline with another fuel are characterized by greater combustion efficiency than the mixtures composed of only a single fuel type, and that the influence of the type of fuel used is significant for the combustion process and its indicator values.

Influences of Cylinder Wall Temperature on Heat Release during Compression Period

2014 ◽  
Vol 660 ◽  
pp. 431-435
Author(s):  
Him Ramsy ◽  
Thahir Ahmad ◽  
M. Jaat ◽  
Amir Khalid
Keyword(s):  
Heat Release ◽  
Wall Temperature ◽  
Temperature Drop ◽  
Combustion Process ◽  
Biodiesel Fuel ◽  
Cylinder Wall ◽  
Rapid Compression Machine ◽  
Free Piston ◽  
Elevated Pressures ◽  
Rapid Compression

Compression period in a diesel engine is generally seen as initial characteristics before injection into combustion chamber. A free-piston type rapid compression machine (RCM) has been designed simulate the combustion phenomena in order to observe the chemical and physical kinetics studies at elevated pressures and temperatures. Purpose of this study is to clarify the effects of wall cylinder temperature on air heat release, especially during compression period. This method can a light piston is pneumatically shot and gets hammered in stopper at compression end. Measurements were made on a light piston compress in a rapid compression machine (RCM) with intended to simulate the actual compression period related phenomena. During this phenomena, the ambient temperature influences from the cylinder wall temperature has appear beneficial for the biodiesel fuel premixing and achieving best mixture preparation There are three tests will used to investigate the effects of the variant temperature of wall cylinder during compression period. Results show high temperature on cylinder wall will be effects decrease during temperature drop after compression stroke. The new characteristics rapid compression machine (RCM) is to develop and analyse before combustion process.

Numerical Simulation of a Controlled Trajectory Rapid Compression Machine

2020 ◽  
Author(s):  
Krishna C. Bavandla ◽  
Dezhi Zhou ◽  
Abhinav Tripathi ◽  
Zongxuan Sun ◽  
Suo Yang
Keyword(s):  
Numerical Simulation ◽  
Rapid Compression Machine ◽  
Rapid Compression

Autoignition of H2/CO at elevated pressures in a rapid compression machine

2006 ◽  
Vol 38 (8) ◽  
pp. 516-529 ◽  
Author(s):  
Gaurav Mittal ◽  
Chih-Jen Sung ◽  
Richard A. Yetter
Keyword(s):  
Rapid Compression Machine ◽  
Elevated Pressures ◽  
Rapid Compression
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