Shock Tube Ignition Delay Data Affected by Localized Ignition Phenomena

Shock tubes have conventionally been used for measuring high-temperature ignition delay times of approximately O(1 ms). In the last decade or so, the operating regime of shock tubes has been extended to lower temperatures by accessing longer observation times. Such measurements may potentially be af...

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Bibliographic Details
Published in:Combustion science and technology 2017-07, Vol.189 (7), p.1138-1161
Main Authors: Javed, T., Badra, J., Jaasim, M., Es-Sebbar, E., Labastida, M. F., Chung, S. H., Im, H. G., Farooq, A.
Format: Article
Language:English
Subjects:
Auto-ignition
Compressing
Computer simulation
Delay
Fuels
Ignition
Ignition regimes
Industrial equipment
n-Heptane
Pre-ignition
Reaction kinetics
Shock tube
Shock tubes
Time measurement
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Summary:Shock tubes have conventionally been used for measuring high-temperature ignition delay times of approximately O(1 ms). In the last decade or so, the operating regime of shock tubes has been extended to lower temperatures by accessing longer observation times. Such measurements may potentially be affected by some non-ideal phenomena. The purpose of this work is to measure long ignition delay times for fuels exhibiting negative temperature coefficient and to assess the impact of shock tube non-idealities on ignition delay data. Ignition delay times of n-heptane and n-hexane were measured over the temperature range of 650-1250 K and pressures near 1.5 atm. Driver gas tailoring and long length of shock tube driver section were utilized to measure ignition delay times as long as 32 ms. Measured ignition delay times agree with chemical kinetic models at high (>1100 K) and low (
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2016.1272599