Author: Boris Dragomir StojkovicPublisher:
ISBN:
Category :
Languages : en
Pages : 302
Book Description
Development and Application of a Time and Space Resolved Optical Diagnostic for Soot Temperature and Concentration in a Spark-ignited Direct-injection Engine
Author: Boris Dragomir StojkovicPublisher:
ISBN:
Category :
Languages : en
Pages : 302
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 778
Book Description
Optical Measurements of Soot Particle Size, Number Density, and Temperature in a Direct Injection Diesel Engine as a Function of Speed and Load
Author: Dale R. TreePublisher:
ISBN:
Category : Diesel motor
Languages : en
Pages : 16
Book Description
In-cylinder measurements of soot particle size, number density and temperature have been made using optical measurements in a direct injection diesel engine. The measurements were made at one location approximately 5 mm long and 1.5 mm wide above the bowl near the head. Two optical techniques were used simultaneously involving light scattering extinction and radiation. An optical probe was designed and mounted in a modified exhaust valve which introduced a beam of light into the cylinder and collected the scattered and radiating light from the soot. The resulting measurements were semi-quantitative, giving an absolute uncertainty on the order of + or - 50% which was attributed mainly to the uncertainty of the optical properties of the soot and the heterogeneous nature of the soot cloud. Measurements at three speeds and three overall equivalence ratios were made. For all of the operating conditions the soot in the measurement volume increased in size to a maximum followed by a rapid decrease. The peak soot diameters were in a range of 30 - 50 nm. Peak soot diameter, soot volume fraction, and soot temperature appeared to increase with equivalence ratio at the measurement location. The results also suggested the soot cloud to be very dense with peak soot volume fraction near 4-6 x 10-6 and thick with a soot cloud thickness approximately 0.4 - 0.6 times the length from the piston to the head.
Laser Diagnostics for Combustion Temperature and Species
Author: Alan C. EckbrethPublisher: CRC Press
ISBN: 1000124622
Category : Technology & Engineering
Languages : en
Pages : 630
Book Description
This book examines the variety of potential laser diagnostic techniques and presents a considerable theoretical foundation elucidating physics relevant to the laser diagnostics. It explains the Raman-based approaches for major species and temperature measurements.
Development and Exploitation of Optical Diagnostic Techniques for Simultaneous 2D Temperature and Equivalence Ratio Measurements for the Understanding of Combustion Phenomena in Reciprocating Engine
Author: Gabrielle TeaOptical Diagnostic System for the Measurement of Gas Temperature and Species Concentration
Author: P. M. HughesPublisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
"A technique termed "coherent, anti-Stokes Raman spectroscopy" (CARS) has been developed at the Combustion and Carbonization Research Laboratory of CANMET's Energy Research Laboratories for the measurement of temperature and species concentration. The advantages of this technique over conventional probing methods are improved temporal and spatial resolution; it is nonintrusive and turbulence parameters can be determined. This report discusses the theoretical basis for such a technique and some of the practical considerations involved in the optical arrangement. To apply this technique successfully, it was necessary to develop sophisticated software and hardware. The incorporation of these and the optics into a CARS system is discussed, together with the theory of its application"--Abstract, p. iii.
Investigations of the Formation and Oxidation of Soot Inside a Direct Injection Spark Ignition Engine Using Advanced Laser-Techniques
Author: Amin VeljiSoot Formation in GDI/GTDI Engines
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
A semi-detailed soot model was successfully implemented in the KIVA3v2-ERC code, which features a discrete multi-component (DMC) fuel vaporization model. A spark ignition model and the G-equation turbulent flame propagation model were also implemented for modeling direct-injection spark-ignition (DISI) engines. Chemistry parallelization for the soot model was also successfully realized in this work. Chemistry parallelization and a newly developed chemistry solver (SpeedCHEM) further reduced the computational time and enabled the successful application of the final code (KIVA-DMC-detsoot-G-SC) to DISI engines with the consideration of multi-component surrogates for real gasoline fuels and 3-D full cylinder engine grids. The semi-detailed soot model considered: soot inception from a four-ring aromatic (A4), soot surface growth through acetylene (C2H2) and aromatics from single-ring to four-ring species (A1, A2, A3, A4), soot coagulation, and soot oxidation through O2 and OH. A reduced polycyclic aromatic hydrocarbon (PAH) chemistry mechanism was coupled with n-heptane, iso-octane and toluene chemistry mechanisms. The combination of the chemistry mechanisms and the soot model was then validated based on experiments in terms of ignition delay, fundamental premixed flames, SANDIA constant volume chamber spray combustion. The pyrolysis process is also a significant process for soot formation at the conditions of DISI engines. Important species for soot formation from toluene pyrolysis processes were also validated based on experiments, and then coupled with the current n-heptane/iso-octane/toluene/PAH chemistry mechanisms for application to DISI engines. The vaporization of wall films plays a significant role in soot formation and a grid-independent wall film vaporization model was formulated for predicting soot emissions near wall films Predicted in-cylinder pressure and particle size distributions (PSDs) were compared to available premixed engine experimental studies. Quantitative agreements of in-cylinder particle distributions are also obtained. The improved models were then applied to studies of soot emissions from early- and late-injection strategies in a four-valve single-cylinder gasoline DISI engine, and the trends were consistent with literature or experimental data.
Optical Diagnostics for Diesel Engine Applications
Author: Department of Energy AL/17575-T1Publisher:
ISBN:
Category : Raman spectroscopy
Languages : en
Pages : 72
Book Description
Author: T. P. Jenkins