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Title: Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine

Abstract

In this work, the effect of H 2O injection on the combustion process of iso-octane was investigated with the aim to better understand the suitability of water addition as a potential engine control parameter for homogeneous-charge compression ignition (HCCI) combustion. Several experiments were combined including premixed low-pressure flames, a jet-stirred reactor (JSR) and a plug-flow reactor (PFR), both at atmospheric pressure, and a single-cylinder research engine (SCRE) operated with either iso-octane or RON 98 gasoline. The thermal effect of H 2O addition was determined in laminar premixed iso-octane/O 2/Ar flames (equivalence ratio $Φ$=1.4, 40 mbar) with H 2O mole fractions of 0 to 0.22, where water addition reduced the temperature measured by laser-induced fluorescence (LIF) by up to 110 K. Speciation data were obtained from these flames as well as in the JSR ($Φ$=0.65, 933 mbar) and PFR experiments ($Φ$=0.65, 970 mbar) with and without H 2O addition in the low- to intermediate temperature regime from 700–1100 K. The chemical analysis in these flame and reactor experiments was performed using molecular-beam mass spectrometry (MBMS) employing either electron ionization (EI) in the PFR and premixed flame or single-photon ionization (PI) by tunable vacuum-ultraviolet radiation in the JSR. The effects on speciesmore » mole fractions were small which is supported by predictions from chemical-kinetic simulations. Quantitative speciation data of the exhaust gas of the SCRE were obtained by using Fourier-transform infrared (FTIR) spectroscopy. A very similar species pool was detected in the laboratory-scale experiments and for the engine operation. It is thus assumed that these results could assist in guiding both the improvement of fundamental chemical-kinetic as well as HCCI engine control models.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [1]; ORCiD logo [4];  [5];  [3];  [1]
  1. Bielefeld Univ. (Germany)
  2. FEV Europe GmbH, Aachen (Germany)
  3. RWTH Aachen Univ. (Germany). Inst. for Combustion Engines
  4. RWTH Aachen Univ. (Germany)
  5. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division, Washington, DC (United States); German Research Foundation (DFG), Bonn (Germany); USDOE National Nuclear Security Administration (NNSA), Washington, DC (United States)
Contributing Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
OSTI Identifier:
1581978
Alternate Identifier(s):
OSTI ID: 1576641
Report Number(s):
SAND-2019-14039J
Journal ID: ISSN 0010-2180; 681566
Grant/Contract Number:  
AC04-94AL85000; NA0003525; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 212; Journal Issue: C; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; water addition; iso-octane; premixed flame; FTIR exhaust gas measurements; jet-stirred reactor; HCCI engine

Citation Formats

Schmitt, Steffen, Wick, Maximilian, Wouters, Christian, Ruwe, Lena, Graf, Isabelle, Andert, Jakob, Hansen, Nils, Pischinger, Stefan, and Kohse-Höinghaus, Katharina. Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine. United States: N. p., 2019. Web. doi:10.1016/j.combustflame.2019.11.023.
Schmitt, Steffen, Wick, Maximilian, Wouters, Christian, Ruwe, Lena, Graf, Isabelle, Andert, Jakob, Hansen, Nils, Pischinger, Stefan, & Kohse-Höinghaus, Katharina. Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine. United States. doi:10.1016/j.combustflame.2019.11.023.
Schmitt, Steffen, Wick, Maximilian, Wouters, Christian, Ruwe, Lena, Graf, Isabelle, Andert, Jakob, Hansen, Nils, Pischinger, Stefan, and Kohse-Höinghaus, Katharina. Fri . "Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine". United States. doi:10.1016/j.combustflame.2019.11.023.
@article{osti_1581978,
title = {Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine},
author = {Schmitt, Steffen and Wick, Maximilian and Wouters, Christian and Ruwe, Lena and Graf, Isabelle and Andert, Jakob and Hansen, Nils and Pischinger, Stefan and Kohse-Höinghaus, Katharina},
abstractNote = {In this work, the effect of H2O injection on the combustion process of iso-octane was investigated with the aim to better understand the suitability of water addition as a potential engine control parameter for homogeneous-charge compression ignition (HCCI) combustion. Several experiments were combined including premixed low-pressure flames, a jet-stirred reactor (JSR) and a plug-flow reactor (PFR), both at atmospheric pressure, and a single-cylinder research engine (SCRE) operated with either iso-octane or RON 98 gasoline. The thermal effect of H2O addition was determined in laminar premixed iso-octane/O2/Ar flames (equivalence ratio $Φ$=1.4, 40 mbar) with H2O mole fractions of 0 to 0.22, where water addition reduced the temperature measured by laser-induced fluorescence (LIF) by up to 110 K. Speciation data were obtained from these flames as well as in the JSR ($Φ$=0.65, 933 mbar) and PFR experiments ($Φ$=0.65, 970 mbar) with and without H2O addition in the low- to intermediate temperature regime from 700–1100 K. The chemical analysis in these flame and reactor experiments was performed using molecular-beam mass spectrometry (MBMS) employing either electron ionization (EI) in the PFR and premixed flame or single-photon ionization (PI) by tunable vacuum-ultraviolet radiation in the JSR. The effects on species mole fractions were small which is supported by predictions from chemical-kinetic simulations. Quantitative speciation data of the exhaust gas of the SCRE were obtained by using Fourier-transform infrared (FTIR) spectroscopy. A very similar species pool was detected in the laboratory-scale experiments and for the engine operation. It is thus assumed that these results could assist in guiding both the improvement of fundamental chemical-kinetic as well as HCCI engine control models.},
doi = {10.1016/j.combustflame.2019.11.023},
journal = {Combustion and Flame},
number = C,
volume = 212,
place = {United States},
year = {2019},
month = {11}
}

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