Simultaneous rainbow schlieren deflectometry and OH* chemiluminescence imaging of a diesel spray flame in constant pressure flow rig

2020 ◽  
Author(s):  
Allen Parker ◽  
C. Taber Wanstall ◽  
Shawn A. Reggeti ◽  
Joshua A. Bittle ◽  
Ajay K. Agrawal
Keyword(s):  
Constant Pressure ◽  
Diesel Spray ◽  
Pressure Flow ◽  
Spray Flame ◽  
Rainbow Schlieren Deflectometry ◽  
Rainbow Schlieren

High-Speed Rainbow Schlieren Deflectometry of N-Heptane Sprays Using a Common Rail Diesel Injector

2016 ◽  
Author(s):  
Eileen M. Mirynowski ◽  
Ajay K. Agrawal ◽  
Joshua A. Bittle
Keyword(s):  
High Speed ◽  
Fuel Injection ◽  
Constant Pressure ◽  
Operating Conditions ◽  
Common Rail ◽  
Fuel Injector ◽  
Pressure Flow ◽  
Schlieren Technique ◽  
Fuel Sprays ◽  
Rainbow Schlieren

More precise measurements of the fuel injection process can enable better combustion control and more accurate predictions resulting in a reduction of fuel consumption and toxic emissions. Many of the current methods researchers are using to investigate the transient liquid fuel sprays are limited by cross sensitivity when studying regions with both liquid and vapor phases present (i.e. upstream of the liquid length). The quantitative rainbow schlieren technique has been demonstrated in the past for gaseous fuel jets and is being developed here to enable study of the spray near the injector. In this work an optically accessible constant pressure flow rig and a modern common rail diesel injector are used to obtain high speed images of vaporizing fuel sprays at elevated ambient temperatures and pressures. Quantitative results of full-field equivalence ratio measurements are presented as well as more traditional measurements such as vapor penetration and angle for a single condition (13 bar, 180°C normal air) using nheptane injected through a single hole (0.1mm diameter) common rail fuel injector at 1000 bar fuel injection pressure. This work serves as a proof of concept for the rainbow schlieren technique being applied to vaporizing fuel sprays and full details of the image processing routine are provided. The ability of the imaging technique combined with the constant pressure flow rig make this approach ideal for generating large data sets in short periods of time for a wide range of operating conditions.

High-Speed Rainbow Schlieren Deflectometry of n-Heptane Sprays Using a Common Rail Diesel Injector

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Eileen M. Mirynowski ◽  
Ajay K. Agrawal ◽  
Joshua A. Bittle
Keyword(s):  
High Speed ◽  
Fuel Injection ◽  
Constant Pressure ◽  
Operating Conditions ◽  
Common Rail ◽  
Fuel Injector ◽  
Pressure Flow ◽  
Schlieren Technique ◽  
Fuel Sprays ◽  
Rainbow Schlieren

More precise measurements of the fuel injection process can enable better combustion control and more accurate predictions resulting in a reduction of fuel consumption and toxic emissions. Many of the current methods researchers are using to investigate the transient liquid fuel sprays are limited by cross-sensitivity when studying regions with both liquid and vapor phases present (i.e., upstream of the liquid length). The quantitative rainbow schlieren technique has been demonstrated in the past for gaseous fuel jets and is being developed here to enable study of the spray near the injector. In this work, an optically accessible constant pressure flow rig (CPFR) and a modern common rail diesel injector are used to obtain high-speed images of vaporizing fuel sprays at elevated ambient temperatures and pressures. Quantitative results of full-field equivalence ratio measurements are presented as well as more traditional measurements such as vapor penetration and angle for a single condition (13 bar, 180 °C normal air) using n-heptane injected through a single hole (0.1 mm diameter) common rail fuel injector at 1000 bar fuel injection pressure. This work serves as a proof of concept for the rainbow schlieren technique being applied to vaporizing fuel sprays, and full details of the image-processing routine are provided. The ability of the imaging technique combined with the constant pressure flow rig make this approach ideal for generating large data sets in short periods of time for a wide range of operating conditions.

scholarly journals Damping Pressure Pulsations in a Wave-Powered Desalination System

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Brandon J. Hopkins ◽  
Nikhil Padhye ◽  
Alison Greenlee ◽  
James Torres ◽  
Levon Thomas ◽  
...  
Keyword(s):  
Constant Pressure ◽  
Low Cost ◽  
Pressure Fluctuations ◽  
Cost Effective ◽  
Coastal Communities ◽  
Pressure Pulsations ◽  
Pressure Flow ◽  
Reliable Source ◽  
Effective Option ◽  
Elastic Pipes

Wave-driven reverse osmosis desalination systems can be a cost-effective option for providing a safe and reliable source of drinking water for large coastal communities. Such systems usually require the stabilization of pulsating pressures for desalination purposes. The key challenge is to convert a fluctuating pressure flow into a constant pressure flow. To address this task, stub-filters, accumulators, and radially elastic-pipes are considered for smoothing the pressure fluctuations in the flow. An analytical model for fluidic capacitance of accumulators and elastic pipes are derived and verified. Commercially available accumulators in combination with essentially rigid (and low cost) piping are found to be a cost-effective solution for this application, and a model for selecting accumulators with the required fluidic-capacitance for the intended system is thus presented.

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

Turbulent Spot in 3-D Constant Pressure Flow

1995 ◽  
pp. 279-286
Author(s):  
M. Jahanmiri ◽  
A. Prabhu ◽  
R. Narasimha
Keyword(s):  
Constant Pressure ◽  
Turbulent Spot ◽  
Pressure Flow

scholarly journals Effects of Operating Parameters on the Time Resolved Soot Concentration in Diesel Spray Flame.

2000 ◽  
Vol 66 (646) ◽  
pp. 1550-1556
Author(s):  
Daisuke SEGAWA ◽  
Hiroshi YAMASAKI ◽  
Toshikazu KADOTA ◽  
Toshihiro KAWATSU ◽  
Mitsuhiro TSUE
Keyword(s):  
Diesel Spray ◽  
Operating Parameters ◽  
Soot Concentration ◽  
Time Resolved ◽  
Spray Flame
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