Quantitative Study of Concentration and Temperature of a Diesel Spray by Using Planar Laser Induced Exciplex Fluorescence Technique

2010 ◽  
Vol 3 (1) ◽  
pp. 717-732 ◽  
Author(s):  
Wanhua Su ◽  
Tian Su ◽  
Hongsong Guo ◽  
Liwei Mao ◽  
Tengfei Xie
Keyword(s):  
Quantitative Study ◽  
Diesel Spray ◽  
Fluorescence Technique ◽  
Planar Laser ◽  
Exciplex Fluorescence

Limitations on the use of the planar laser induced exciplex fluorescence technique in diesel sprays

Fuel ◽  
2005 ◽  
Vol 84 (18) ◽  
pp. 2301-2315 ◽  
Author(s):  
J.M. Desantes ◽  
J.V. Pastor ◽  
J.M. Pastor ◽  
J.E. Juliá
Keyword(s):  
Fluorescence Technique ◽  
Diesel Sprays ◽  
Planar Laser ◽  
Exciplex Fluorescence

Diesel Spray Analysis by Means of Planar Laser-Induced Exciplex Fluorescence

2006 ◽  
Vol 7 (1) ◽  
pp. 77-89 ◽  
Author(s):  
F Payri ◽  
J V Pastor ◽  
J M Pastor ◽  
J E Juliá
Keyword(s):  
Diesel Spray ◽  
Planar Laser ◽  
Exciplex Fluorescence

Planar Fluorescence Technique for Visualization of a Diesel Spray

1992 ◽  
Author(s):  
Mitsuhiro Tsue ◽  
Hiroshi Hattori ◽  
Akira Saito ◽  
Toshikazu Kadota
Keyword(s):  
Diesel Spray ◽  
Fluorescence Technique

Calibration of a planar laser induced fluorescence technique for use in large scale water facilities

Measurement ◽  
2013 ◽  
Vol 46 (8) ◽  
pp. 2597-2607 ◽  
Author(s):  
Luis A. Torres ◽  
Brian A. Fleck ◽  
David J. Wilson ◽  
David S. Nobes
Keyword(s):  
Large Scale ◽  
Laser Induced Fluorescence ◽  
Fluorescence Technique ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

Two-dimensional imaging of ignition and soot formation processes in a diesel flame

2005 ◽  
Vol 6 (1) ◽  
pp. 21-42 ◽  
Author(s):  
H Kosaka ◽  
T Aizawa ◽  
T Kamimoto
Keyword(s):  
Soot Formation ◽  
Diesel Spray ◽  
Oxidation Reactions ◽  
Soot Particles ◽  
Nozzle Orifice ◽  
Spray Flame ◽  
Soot Precursor ◽  
Planar Laser ◽  
Laser Induced Incandescence ◽  
Ambient Gas

The processes of ignition and formation of soot precursor and soot particles in a diesel spray flame achieved in a rapid compression machine (RCM) were imaged two-dimensionally using the laser sheet techniques. For the two-dimensional imaging of time and of location where ignition first occurs in a diesel spray, planar laser-induced fluorescence (PLIF) of formaldehyde was applied to a diesel spray in an RCM. Formaldehyde has been hypothesized to be one of the stable intermediate species marking the start of oxidation reactions in a transient spray under compression ignition conditions. In this study, the laser-induced fluorescence (LIF) images of the formaldehyde formed in a diesel fuel spray during the ignition process have been obtained by exciting formaldehyde with the third harmonic of a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser. The LIF images of formaldehyde in a spray revealed that the time when the first fluorescence is detected is almost identical with the time when the total heat release due to low-temperature oxidation reactions equals the heat absorption by fuel vaporization in the spray. The formaldehyde level rose steadily until the high-temperature reaction phase of diesel spray ignition. At the start of this ‘hot-ignition’ phase, the formaldehyde concentration fell rapidly, thus signalling the end of the low-temperature ignition phase. Increases in the initial ambient gas temperatures advanced the hot-ignition starting time. The first hot ignition occurred in the periphery of spray head at initial ambient gas temperatures between 580 and 660 K. When the ambient gas temperature was increased to 790 K, the position of the first ignition moved to the central region of the spray head. For the investigation of soot formation processes in a diesel spray flame, simultaneous imaging of the soot precursor and soot particles in a transient spray flame in an RCM was conducted by PLIF and by planar laser-induced incandescence (PLII) techniques. The third harmonic (355 nm) and the fundamental (1064 nm) laser pulses from an Nd:YAG laser, between which a delay of 44 ns was imposed by 13.3 m of optical path difference, were used to excite LIF from the soot precursor and laser-induced incandescence (LII) from soot particles in the spray flame. The LIF and the LII were separately imaged by two image-intensified charge-coupled device cameras with identical detection wavelengths of 400 nm and bandwidths of 80 nm. The LIF from the soot precursor was mainly located in the central region of the spray flame between 40 and 55 mm (between 270 and 370 times the nozzle orifice diameter d°) from the nozzle orifice. The LII from soot particles was observed to surround the soot precursor LIF region and to extend downstream. The first appearance of the LIF from the soot precursor in the spray flame preceded the appearance of the LII from soot particles. The intensity of the LIF from the soot precursor reached its maximum immediately after rich premixed combustion. In contrast, the intensity of the LII from soot particles increased gradually and reached its maximum after the end of injection. Measured LIF spectra, of the soot precursor in the spray flame, were very broad with the peak between 430 and 460 nm.

scholarly journals Planar Laser Rayleigh Scattering for Analyzing Diesel Spray Characteristics

2008 ◽  
Vol 43 (2) ◽  
pp. 273-278
Author(s):  
Taku TSUJIMURA ◽  
Takuro MITA ◽  
Zhili CHEN ◽  
Shinichi GOTO
Keyword(s):  
Rayleigh Scattering ◽  
Diesel Spray ◽  
Spray Characteristics ◽  
Planar Laser
Sign in / Sign up

Export Citation Format

Share Document