Determination of the Fuel Concentration Distribution in a Supersonic combustion Chamber

2019 ◽  
Keyword(s):  
Combustion Chamber ◽  
Concentration Distribution ◽  
Supersonic Combustion ◽  
Fuel Concentration

Unsteady Numerical Analysis on PCCI Combustion Affected by Intentional Initial Fuel Concentration Distribution

2010 ◽  
Author(s):  
Kenji Yoshida ◽  
Kenichi Yamada ◽  
Naoshige Matsuo ◽  
Toshinobu Tanimura ◽  
Takemori Takayama ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Combustion Chamber ◽  
Volume Change ◽  
Time Variation ◽  
Concentration Distribution ◽  
Chemical Species ◽  
Elementary Reactions ◽  
Fuel Concentration ◽  
Initial Fuel ◽  
Euler's Equations

Unsteady numerical analyses were carried out for the PCCI combustion realization on the next generation diesel engine. The effects of intentional initial fuel concentration distribution on the ignition timing and the expansion of the operable range were focused. The numerical code was originally developed to analyze the unsteady combustion behavior of premixed gas with intentional initial fuel concentration distribution in the combustion chamber of PCCI engine. The fundamental equations for the numerical analysis are the Euler’s equations for compressible fluid, that consist of the conservation equation of mass, momentum, energy and chemical species. The equations are expressed in axisymmetric cylindrical (r-z) coordinate system. The time variation of the internal cylinder volume of the reciprocating crank-piston movement is expressed by the volume change rate, which is substituting the convection term in axial direction of the Euler’s equations. By using this technique, we can reduce the spatial dimension of the equations with keeping the consideration of volume change of the combustion chamber of reciprocating engine. The radial direction corresponds to the bore of the engine cylinder. By solving this equation system, we can consider the radial distribution in combustion chamber during the PCCI combustion such as temperature, mass fraction of chemical species, pressure, and so on. Detailed chemical kinetics with elementary reactions and multi-component diffusion for n-heptane system as fuel, ERC-mechanism, were considered. The NOx emission can be also considered by using the part of GRI-Mech3.0 for generation of thermal NOx. Totally, the 34 chemical species and 61 elementary reactions were considered. This code has a high resolution for time and space to capture the dynamic behavior in PCCI combustion such as a generation and propagation of shockwave causing detonation. A series of unsteady events on PCCI combustion can be simulated by considering the time variation of volume of combustion chamber varied with crank angle; such as the charged compression and auto-ignition of premixed gas, the flame propagation and the detonation with shockwave.

DETERMINATION OF THE TYPE OF A SINGLE-USE GRENADE LAUNCHER BASED ON ITS COMPOSITE PARTS AND FRAGMENTS OF REACTIVE GRENADE FOUND AT THE PLACE OF ACCIDENT

2017 ◽  
Vol 17 ◽  
pp. 245-252
Author(s):  
V. V. Somov
Keyword(s):  
Combustion Chamber ◽  
Structural Features ◽  
Outlet Section ◽  
Technical Expertise ◽  
Jet Engine ◽  
Size Ofthe ◽  
Single Use ◽  
Nozzle Block ◽  
Considerable Damage

In carrying out an investigation into the explosion, among others, the investigative version of the use of a single-use reactive grenade launcher is being considered. The most common for criminal explosions are applied grenade launchers RPG-18, RPG-22, RPG-26. Their use is due to a number of such properties as small size and weight, which makes it possible to transfer them covertly, the range of the shot significantly exceeding the range of the hand grenade throw, the high detonating effect of the rocket grenade explosion. The single-use rocket launchers are generally of the same design. Their differences are in the features of the components construction and dimensional characteristics, which are given in the article. On the basis of expert practice, details ofgrenade launchers that remain at the site of the explosion and have the least damage are determined. These details are the objects of investigation of the explosion technical expertise. These objects include launchers of grenade launchers and rocket parts ofjet grenades. The design features of the launchers, their dimensional characteristics and marking symbols make it possible to determine their belonging to a specific type of jet grenade launchers. Missile parts of jet grenades differ in the form of the combustion chamber of the jet engine, nozzle, in the size ofthe outlet section of the nozzle, in the form and size of the stabilizerfeathers. To determine the belonging of the rocket part of the grenade to a specific type ofjet grenade launcher, it’s necessary to establish a set of structural features and dimensional characteristics. At considerable damage of the combustion chamber of the jet engine, as a rule, the nozzle block remains intact that allows to define diameter of critical section of a nozzle, and on it to establish type of the used single-use grenade launcher.

scholarly journals Characteristics of gaseous film cooling with hydrocarbon fuel in supersonic combustion chamber

2021 ◽  
Author(s):  
Tingting Jing ◽  
Zhen Xu ◽  
Jiachen Xu ◽  
Fei Qin ◽  
Guoqiang He ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Film Cooling ◽  
Hydrocarbon Fuel ◽  
Supersonic Combustion

Computational investigation of multi-cavity fuel injection on hydrogen mixing at supersonic combustion chamber

2020 ◽  
Vol 45 (15) ◽  
pp. 9077-9087 ◽  
Author(s):  
Zhixiong Li ◽  
Tran Dinh Manh ◽  
M. Barzegar Gerdroodbary ◽  
Nguyen Dang Nam ◽  
R. Moradi ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Fuel Injection ◽  
Supersonic Combustion ◽  
Computational Investigation
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