The use of driver inserts to reduce non-ideal pressure variations behind reflected shock waves

Hong, Zekai; Pang, Genny A.; Vasu, Subith; Davidson, David F.; Hanson, Ronald K.

doi:10.1007/s00193-009-0205-y

Cited by 106 publications

(35 citation statements)

References 16 publications

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“…At lower temperatures where longer test times are required, near-constant pressure profiles over the longer test times were achieved by using driver inserts. Further details on driver insert design can be found in Hong et al [16].…”

Section: 41mentioning

confidence: 99%

An experimental and modeling study of propene oxidation. Part 2: Ignition delay time and flame speed measurements

Burke

Donagh

et al. 2015

Combustion and Flame

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285

208

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Experimental data obtained in this study (Part II) complement the speciation data presented in Part I, but also offer a basis for extensive facility cross-comparisons for both experimental ignition delay time (IDT) and laminar flame speed (LFS) observables.To improve understanding of the ignition characteristics of propene, a series IDT experiments were performed in six different shock tubes and two rapid compression machines (RCMs) under conditions not previously studied. This study is the first of its kind to directly compare ignition in several different shock tubes over a wide range of conditions. For common nominal reaction conditions among these facilities, cross-comparison of shock tube IDTs suggests 20-30% reproducibility (2σ) for the IDT observable. The combination of shock tube and RCM data greatly expands the data available for validation of propene oxidation models to higher pressures (2-40 atm) and lower temperatures (750-1750 K).Propene flames were studied at pressures from 1-20 atm and unburned gas temperatures of 295-398 K for a range of equivalence ratios and dilutions in different facilities. The present propene-air LFS results at 1 atm were also compared to LFS measurements from the literature. With respect to initial reaction conditions, the present experimental LFS cross-comparison is not as comprehensive as the IDT comparison; however, it still suggests reproducibility limits for the LFS observable. For the LFS results, there was agreement between certain data sets and for certain equivalence ratios (mostly in the lean region), but the remaining discrepancies highlight the need to reduce uncertainties in laminar flame speed experiments amongst different groups and different methods. Moreover, this is the first study to investigate the burning rate characteristics of propene at elevated pressures (> 5 atm).IDT and LFS measurements are compared to predictions of the chemical kinetic mechanism presented in Part I and good agreement is observed.

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Section: 41mentioning

confidence: 99%

An experimental and modeling study of propene oxidation. Part 2: Ignition delay time and flame speed measurements

Burke

Donagh

et al. 2015

Combustion and Flame

Self Cite

285

208

View full text Add to dashboard Cite

show abstract

“…Hence, we measured propane ignition delay times in a lean mixture (0.8% C 3 H 8 /8% O 2 /Ar) at nominal pressures of 6, 24 and 60 atm, first using a conventional shock tube, to confirm the discrepancies between experimental data and simulations based on two current chemical mechanisms using constant U and V constraints. We then employed a driver-insert method (developed in our laboratory [8]) to minimize the post-shock pressure variations and generate near-constant-volume test conditions for the propane oxidation study. (Preliminary 6-atm propane ignition time measurements without the driver insert were previously described in Ref.…”

Section: Introductionmentioning

confidence: 99%

Shock tube ignition delay time measurements in propane/O2/argon mixtures at near-constant-volume conditions

Lam

Hong

Davidson

et al. 2011

Proceedings of the Combustion Institute

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“…Satisfactory results could be obtained using analytical and numerical §uid dynamic approaches to layout such a facility [7,18]. Two sample results from two di¨erent facilities (DDST at ITLR ¡ Universit at Stuttgart and HPST at the High Temperature Gasdynamics Laboratory ¡ Stanford University) were shown above in Fig.…”

Section: Shock Tube Characterization and Performancementioning

confidence: 98%

“…The e¨ects of the skimmer on the Figure 5 Detailed view of the driver section showing the contoured liner insert Figure 6 Experimental pressure traces with (1) and without (2) driver insert from two di¨erent facilities. The dashed lines indicate very uniform test conditions when using a driver insert and a linear pressure increase without a driver insert: (a) DDST at the Institute of Aerospace Thermodynamics ¡ ITLR (Universit at Stuttgart) [7]; and (b) HPST at the High Temperature Gasdynamics Laboratory (Stanford University) [18] §ow conditions in the test section have been analyzed in detail in [7]. Brie §y, it turned out that as the re §ected shock wave leaves the skimmer and propagates into the circular tube (i. e., sudden widening of cross section), an expansion fan forms and travels back into the test section.…”

Section: Shock Tubementioning

confidence: 99%

Fluid disintegration studies in a specialized shock tube

Stotz

Lamanna

2011

Progress in Propulsion Physics

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This paper describes a double-diaphragm shock tube, designed for the experimental investigation of fundamental processes related to §uid disintegration and mixing at elevated pressures and temperatures, representative for realistic engine conditions. Special features of the shock tube include a variable-area driver section to compensate for shock attenuation and boundary layer e¨ects. In discussing the shock tube operational envelope, particular emphasis is given to the requirements to be ful¦lled to attain reproducible and accurate experimental data and to capture the most relevant features of subcritical and supercritical mixing behavior. A review of potential thermodynamic transitions for near-critical jet disintegration phenomena is presented and the main features of each disintegration mode are discussed on the basis of the shock tube experiments.

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The use of driver inserts to reduce non-ideal pressure variations behind reflected shock waves

Cited by 106 publications

References 16 publications

An experimental and modeling study of propene oxidation. Part 2: Ignition delay time and flame speed measurements

An experimental and modeling study of propene oxidation. Part 2: Ignition delay time and flame speed measurements

Shock tube ignition delay time measurements in propane/O2/argon mixtures at near-constant-volume conditions

Fluid disintegration studies in a specialized shock tube

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