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Strategies for obtaining long constant-pressure test times in shock tubes

Journal Article · · Shock Waves
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
  2. Stanford Univ., CA (United States). Dept. of Mechanical Engineering
+ Show Author Affiliations

Several techniques have been developed for obtaining long, constant-pressure test times in reflected shock wave experiments in a shock tube, including the use of driver inserts, driver gas tailoring, helium gas diaphragm interfaces, driver extensions, and staged driver gas filling. Here, we detail these techniques, including discussion on the most recent strategy, staged driver gas filling. Experiments indicate that this staged filling strategy increases available test time by roughly 20 % relative to single-stage filling of tailored driver gas mixtures, while simultaneously reducing the helium required per shock by up to 85 %. This filling scheme involves firstly mixing a tailored helium–nitrogen mixture in the driver section as in conventional driver filling and, secondly, backfilling a low-speed-of-sound gas such as nitrogen or carbon dioxide from a port close to the end cap of the driver section. Using this staged driver gas filling, in addition to the other techniques listed above, post-reflected shock test times of up to 0.102 s (102 ms) at 524 K and 1.6 atm have been obtained. Spectroscopically based temperature measurements in non-reactive mixtures have confirmed that temperature and pressure conditions remain constant throughout the length of these long test duration trials. Finally, these strategies have been used to measure low-temperature n-heptane ignition delay times.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1338397
Report Number(s):
SAND2016-12714J; 649988
Journal Information:
Shock Waves, Journal Name: Shock Waves Journal Issue: 6 Vol. 25; ISSN 0938-1287
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Numerical investigation of the impact of tailored driver gases and driver inserts on shock tube flows journal July 2018
Minimally intrusive optical probe for in situ shock tube measurements of temperature and species via tunable IR laser absorption journal October 2017
Measuring the effectiveness of high-performance Co-Optima biofuels on suppressing soot formation at high temperature journal February 2020
Dependence of Calculated Postshock Thermodynamic Variables on Vibrational Equilibrium and Input Uncertainty journal July 2017

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS