The Time Required for Constant-Volume Combustion

1952 ◽  
Vol 19 (1) ◽  
pp. 72-76
Author(s):  
A. S. Campbell
Keyword(s):  
Temperature Distribution ◽  
Flame Front ◽  
Thermodynamic Analysis ◽  
Burning Velocity ◽  
Combustion Process ◽  
Constant Volume ◽  
Time Rate ◽  
Constant Volume Combustion ◽  
Time Required ◽  
Normal Burning Velocity

Abstract By combining the results of an elementary thermodynamic analysis of the temperature distribution in the burned gases of a constant-volume bomb with an examination of the velocity relations at the flame front, it is possible to relate the “normal burning velocity” to the time rate of production of burned gases. Integration of this equation leads to an estimate of the time required for the combustion process.

Research on Emissions of Benzene & Polycyclic Aromatic Hydrocarbons in Constant Volume Combustion Bomb

2012 ◽  
Vol 468-471 ◽  
pp. 2993-2997
Author(s):  
Xiao Juan Liang ◽  
Xi Qin Li
Keyword(s):  
Mass Spectrometry ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Combustion Process ◽  
Combustion Products ◽  
Constant Volume ◽  
Gas Chromatography Mass Spectrometry ◽  
Test Results ◽  
Constant Volume Combustion ◽  
Polycyclic Aromatic

Polycyclic aromatic hydrocarbons are harmful to human body and environment. In order to know the formatting rules of benzene and polycyclic aromatic hydrocarbons in gasoline combustion process, a series of tests are done in a constant volume combustion bomb. The emissions of benzene and polycyclic aromatic hydrocarbons are measured by a gas chromatography-mass spectrometry analyzer. The test results show that the benzene in combustion products comes from the incomplete combustion fuel. The free radicals out of cracking fuel may also become benzene in combustion process. Adding ethanol in fuels does not necessarily increase the emission of benzene. Formation of polycyclic aromatic hydrocarbons varies with temperature.

Study of Hydrogen-Air Flame Stability with Different Initial Pressure

2012 ◽  
Vol 232 ◽  
pp. 784-787
Author(s):  
Xing Hua Liu ◽  
Hong Liang ◽  
Zhi Qiang Fan ◽  
Dao Jing Wang
Keyword(s):  
Laminar Flame ◽  
Initial Conditions ◽  
Combustion Process ◽  
Initial Pressure ◽  
Pressure Oscillation ◽  
Constant Volume ◽  
Flame Stability ◽  
Wall Surface ◽  
Constant Volume Combustion

Hydrogen-air flame stability with different initial pressures is studied in a constant volume combustion cell. The schlieren flame images and the pressure curves are obtained under various initial pressures, equivalence ratios and initial temperatures. The results show that the time of the laminar flame stage is decreasing with the increasing initial pressure. The main reason of the rapid increasing pressure is whether the squish flame appears. The squish flame stage does not occur when the value of the initial pressure is very low. At this time, the varibility of the pressure is very low. The pressure oscillation occurs when the squish flame or the main flame transmits to the under wall surface. Meanwhile, under the different initial conditions, the time of the mixture combustion process stages is often different, and the flame stability is different. At the same time, the flame crtical radius is decreasing when the initial pressure is increasing.

scholarly journals The Effect of Working Fluids on Premixed Hydrogen Combustion in a Constant Volume Combustion Chamber

2019 ◽  
Author(s):  
Mohammadrasool Morovatiyan ◽  
Martia Shahsavan ◽  
Jonathan Aguilar ◽  
John Hunter Mack
Keyword(s):  
Combustion Chamber ◽  
Internal Combustion Engines ◽  
Burning Velocity ◽  
Constant Volume ◽  
Partial Substitution ◽  
Partial Replacement ◽  
Working Fluid ◽  
Laminar Burning Velocity ◽  
Constant Volume Combustion ◽  
Constant Volume Combustion Chamber

Premixed combustion of hydrogen was investigated with the purpose of examining the effect of the full or partial substitution of argon for nitrogen in air on laminar burning velocity. Theoretically, this partial replacement decreases the NOx emissions and increases the thermal efficiency of internal combustion engines due to the high specific heat ratio of noble gases. An optically-accessible constant volume combustion chamber (CVCC) with central ignition was used to study flame propagation, flame morphological structure, and instability. The spherical flame development was studied using a high-speed Z-type Schlieren visualization system. Moreover, a numerical model was developed to convert the pressure rise data to laminar burning velocity. Coupling the model to a chemical equilibrium code aids in determining the burned gas properties. The experimental and numerical investigations indicate that increasing the concentration of argon as the working fluid in the mixture can increase the laminar burning velocity and extend the lean flammability limit.

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