Soot Oxidation in Periphery of Diesel Spray Flame via High-Speed Sampling and HR-TEM Observation

2017 ◽  
Vol 10 (5) ◽  
pp. 2330-2341 ◽  
Author(s):  
Yoshiaki Toyama ◽  
Nozomi Takahata ◽  
Katsufumi Kondo ◽  
Tetsuya Aizawa
Keyword(s):  
High Speed ◽  
Soot Oxidation ◽  
Diesel Spray ◽  
Spray Flame ◽  
High Speed Sampling

High-speed ultraviolet chemiluminescence imaging of late combustion in diesel spray flame

2017 ◽  
Vol 18 (1-2) ◽  
pp. 93-104 ◽  
Author(s):  
Katsufumi Kondo ◽  
Masaki Kuribayashi ◽  
Kosuke Sakai ◽  
Tetsuya Aizawa
Keyword(s):  
High Speed ◽  
Diesel Spray ◽  
Spray Flame

Infrared high-speed thermography of combustion chamber wall impinged by diesel spray flame

2021 ◽  
pp. 146808742110080
Author(s):  
Tetsuya Aizawa ◽  
Tomoki Kinoshita ◽  
Shinobu Akiyama ◽  
Kouya Shinohara ◽  
Yuusei Miyagawa
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Thermal Radiation ◽  
Combustion Chamber ◽  
High Speed ◽  
Chamber Wall ◽  
Maximum Temperature ◽  
Diesel Spray ◽  
Quartz Window ◽  
Spray Flame

As a demonstration of a new method to examine the extremely unsteady and spatially varying wall heat transfer phenomena on diesel engine combustion chamber wall, high-speed imaging of infrared thermal radiation from the wall surface impinged by a diesel spray flame was attempted using a high-speed infrared camera. A 35 mm-diameter chromium-coated quartz window surface was impinged by a diesel spray flame with an impinging distance of 27 mm from the nozzle orifice in a constant volume combustion chamber. The infrared thermal radiation from the back surface of the 0.6 µm thick chromium layer was successfully visualized at 10 kHz frame rate and 128 × 128 pixel resolution through the quartz window. The infrared radiation exhibited coherent and streaky structure with radial stripes extending and waving from the stagnation point. The width of the radial stripes, spatial amplitude and the period of the waving movement were comparable to the ones for turbulent heat transfer on the engine cylinder wall previously measured with a heat flux sensor, suggesting that they are resulting from the turbulent structure in the wall-impinging diesel flame. The radiation intensity was calibrated to temperature and converted to heat flux via 3-D numerical analysis of transient thermal conduction in the quartz window. The peak-to-peak variation amplitudes of temperature and heat flux among the radial stripes during the diesel spray flame impingement were about 20 K and 2.3 MW/m2, corresponding to 13% of 150 K maximum temperature swing amplitude and 18 MW/m2 maximum heat flux, respectively.

Vortex Development and Heat Release Enhancement in Diesel Spray Flame by Inversed-Delta Injection Rate Shaping Using TAIZAC Injector

2021 ◽  
Author(s):  
Tetsuya Aizawa ◽  
Tomoki Kinoshita ◽  
Yohei Tanaka ◽  
Tatsuki Takahashi ◽  
Yuusei Miyagawa ◽  
...  
Keyword(s):  
Heat Release ◽  
Injection Rate ◽  
Diesel Spray ◽  
Spray Flame ◽  
Rate Shaping

scholarly journals Analysis of ECN spray A ignition in a Rapid Compression Machine using simultaneous OH* chemiluminescence and formaldehyde PLIF

2020 ◽  
Vol 75 ◽  
pp. 38 ◽  
Author(s):  
Camille Strozzi ◽  
Moez Ben Houidi ◽  
Julien Sotton ◽  
Marc Bellenoue
Keyword(s):  
High Temperature ◽  
Time Evolution ◽  
High Speed ◽  
Numerical Models ◽  
Phase Region ◽  
Diesel Spray ◽  
Rapid Compression Machine ◽  
Time Resolved ◽  
Cool Flame ◽  
Rapid Compression

The canonical diesel spray A is characterized in an optical Rapid Compression Machine (RCM) at high temperature and density conditions (900 K and 850 K, ρ = 23 kg/m3) using simultaneous high-speed OH* chemiluminescence and two-pulse 355 nm Planar Laser Induced Fluorescence (PLIF). The focus is on the time evolution and the repeatability of the early stages of both cool flame and hot ignition phenomena, and on the time evolution of the fluorescing formaldehyde region in between. In particular, time resolved data related to the cool flame are provided. They show the development of several separated kernels on the spray sides at the onset of formaldehyde appearance. Shortly after this phase, the cool flame region expands at high velocity around the kernels and further downstream towards the richer region at the spray head, reaching finally most of the vapor phase region. The position of the first high temperature kernels and their growth are then characterized, with emphasis on the statistics of their location. These time-resolved data are new and they provide further insights into the dynamics of the spray A ignition. They bring some elements on the underlying mechanisms, which will be useful for the validation and improvement of numerical models devoted to diesel spray ignition.

Investigation of transient PVC dynamics in a strongly swirled spray flame using high speed planar laser imaging of SnO2 microparticles

2021 ◽  
Vol 225 ◽  
pp. 305-319
Author(s):  
Guillaume Vignat ◽  
Daniel Durox ◽  
Antoine Renaud ◽  
Théa Lancien ◽  
Ronan Vicquelin ◽  
...  
Keyword(s):  
High Speed ◽  
Laser Imaging ◽  
Spray Flame ◽  
Planar Laser
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