Ethanol ignition in a high-pressure shock tube: Ignition delay time and high-repetition-rate imaging measurements

2020 ◽  
Author(s):  
Damien Nativel ◽  
Philipp Niegemann ◽  
Jürgen Herzler ◽  
Mustapha Fikri ◽  
Christof Schulz
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Repetition Rate ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
High Repetition Rate ◽  
Pressure Shock ◽  
High Repetition

scholarly journals High-pressure shock tube study of ethanol oxidation: Ignition delay time and CO time-history measurements

2020 ◽  
Vol 212 ◽  
pp. 486-499 ◽  
Author(s):  
Andrew R. Laich ◽  
Erik Ninnemann ◽  
Sneha Neupane ◽  
Ramees Rahman ◽  
Samuel Barak ◽  
...  
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Ethanol Oxidation ◽  
Time History ◽  
Pressure Shock ◽  
Tube Study

scholarly journals Shock Tube Combustion Analysis

2021 ◽  
Author(s):  
Claudio Marcio Santana ◽  
Jose Eduardo Mautone Barros
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Soybean Oil ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Low Pressure ◽  
Pressure Chamber ◽  
Ignition Delay Times ◽  
Delay Times

The shock tube is a metal tube that the gas at low pressure and high pressure are separated by a diaphragm. When the diaphragm (make of material copper and aluminum) breaks on predetermined conditions (high pressure in this case) produces shock waves that move from the high-pressure chamber (known the compression chamber or Driver section) for low pressure chamber (known the expansion chamber or Driven section). The objective of this work is the correlate the ignition delay times of convectional Diesel and Biodiesel from soybean oil measured in a shock tube. The results were correlated with the cetane number of respective fuels and compared with the ignition delay times of Diesel and Biodiesel with cetane numbers of known. The ignition delay time of biodiesel from soybean oil was approximately three times greater than the ignition delay time of convectional Diesel. The contribution of this work is that it shows why pure biodiesel should not be used as substitutes for Diesel compression ignition engines without any major changes in the engines.

Ignition delay times of methane fuels at thrust chamber conditions in an ultra-high-pressure shock tube

2022 ◽  
Author(s):  
Michael Pierro ◽  
Andrew Laich ◽  
Justin J. Urso ◽  
Cory Kinney ◽  
Subith Vasu ◽  
...  
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Ignition Delay ◽  
Pressure Shock ◽  
Thrust Chamber ◽  
Ultra High Pressure ◽  
Ignition Delay Times ◽  
Delay Times

Shock Tube Study of Nitric Oxide Addition on Ignition Delay Time of n-Dodecane/Air Mixture

2019 ◽  
pp. 143-149
Author(s):  
Jiankun Shao ◽  
Yangye Zhu ◽  
Chris Almodovar ◽  
David F. Davidson ◽  
Ronald K. Hanson
Keyword(s):  
Nitric Oxide ◽  
Shock Tube ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Oxide Addition ◽  
Tube Study

Ignition-Delay Time Measurements of Heavy Hydrocarbons in an Aerosol Shock Tube

2020 ◽  
Author(s):  
Joshua Hargis ◽  
Sean Cooper ◽  
Olivier Mathieu ◽  
Bing Guo ◽  
Eric L. Petersen
Keyword(s):  
Shock Tube ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Heavy Hydrocarbons

Interpretation of Flow Reactor Based Ignition Delay Measurements

2009 ◽  
Author(s):  
David Beerer ◽  
Vincent McDonell ◽  
Scott Samuelsen ◽  
Leonard Angello
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Residence Time ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Flow Reactor ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Recirculation Zones

Compositional variation of global gas supplies is becoming a growing concern. Both the range and rate-of-change of this variation is expected to increase as global markets for Liquefied Natural Gas (LNG) continue to expand. Greater fuel composition variation poses increased operational risk to gas turbine engines employing lean premixed combustion systems. Information on ignition delay at high pressure and intermediate temperatures is valuable for lean premixed gas turbine design. In order to avoid autoignition of the fuel/air mixture within the premixer, the ignition delay time must be greater than the residence time. Evaluating the residence time is not a straight forward task because of the complex aerodynamics due to recirculation zones, separation regions, and boundary layers effects which may create regions where the local residence times may be longer than the bulk or average residence time. Additionally, reliable experiments on ignition delay at gas turbine conditions are difficult to conduct. Devices for testing include shock tubes, rapid compression machine and flow reactors. In a flow reactor ignition delay data are commonly determined by measuring the distance from the fuel injector to the reaction front (L) and dividing it by the bulk or average flow velocity (U) under steady flow conditions to obtain a bulk residence time which is assumed to be equal to the ignition delay time. However this method is susceptible to the same boundary layer effects or recirculation zones found in premixers. An alternative method for obtaining ignition delay data in a flow reactor is presented herein, where ignition delay times are obtained by measuring the time difference between fuel injection and ignition using high speed instrumentation. Ignition delay times for methane, ethane and propane at gas turbine conditions were in the range of 40–500 ms. The results obtained show excellent agreement with recently proposed chemical mechanisms for hydrocarbons at low temperature/high pressure conditions.

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