Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber
نویسندگان
چکیده
In recent years, the Engine Combustion Network (ECN) has developed as a worldwide reference for understanding and describing engine combustion processes, successfully bringing together experimental numerical efforts. Since experiments simulations both target same boundary conditions, an accurate characterization of stratified environment that is inevitably present in facilities required. The difference between core-, pressure-derived bulk-temperature pre-burn vessels been addressed various previous publications. Additionally, thermocouple measurements have provided initial data on layer close to injector nozzle, showing transition reduced ambient temperatures. conditions at start fuel injection influence physicochemical properties spray, including near nozzle mixing, heat release computations, parameters. To address temperature stratification more detail, larger distances from spray axis conducted. Both field prior pre-combustion event preconditions high-temperature, high-pressure ambient, well moment were studied. reveal cold with better spatial resolution, Rayleigh scattering carried out. impact layers are illustrated quantified using Spray A conditions. Next simulation uniform field, six different distributions generated. These based mean superimposed by randomized variance, again derived experiments. results showed asymmetric flame structure arises computed when input used. these predictions, first-stage ignition advanced 24μs, while second-stage delayed 11μs. At time lift-off length top bottom up 1.1 mm observed. Furthermore, less stable over time. Given shown dependency, made available along vessel geometry recommended basis future simulations.
منابع مشابه
Development of a Rate of Injection Bench and Constant Volume Combustion Chamber for Diesel Spray Diagnostics
To help understand the complex fuel spray combustion phenomena in modern diesel engine using high injection pressure, a fuel injection test bench and a constant volume combustion chamber were developed and demonstrated in this study for diesel spray diagnostics. Both facilities are significant when linking between spray injection and combustion dynamics and engine performance. This link is impo...
متن کاملOperating Range Expansion in a HCCI Natural Gas Engine Using Charge and Thermal Stratification in Combustion Chamber
HCCI operating window has two distinct boundaries of knock at higher load region and misfiring/partial burning at lower load region. Moreover, there is no conventional direct way of controlling combustion timing in an HCCI engine. In this research, experimental study were carried out to investigate the effect of thermal and charge stratification on expansion of the operating range of a natural ...
متن کاملPDF-based simulations of turbulent spray combustion in a constant-volume chamber under diesel-engine-like conditions
Transported probability density function (PDF) methods are used to account for turbulent fluctuations in composition and temperature in simulations of liquid fuel injection (n-heptane), vaporization, mixing, autoignition, combustion and soot formation for a constant-volume combustion chamber. Both stochastic Lagrangian particle and stochastic Eulerian field methods are used to solve the modeled...
متن کاملStudy on Combustion Characteristics of the Blast Furnace Gas in the Constant Volume Combustion Bomb
Blast furnace gas is the byproduct of smelting steel production process, and is the important secondary energy source. It is can be used as fuel for engines to generate electricity for most middle and small steel enterprises. In order to understand the combustion mechanism and provide the basis for the design of blast furnace gas engine,premixed laminar combustion experiments of the blast furna...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Experimental Thermal and Fluid Science
سال: 2023
ISSN: ['1879-2286', '0894-1777']
DOI: https://doi.org/10.1016/j.expthermflusci.2023.110866