Match!
Wenkai Liang
Princeton University
20Publications
8H-index
216Citations
Publications 20
Newest
#1Ran Sui (Princeton University)
#2Wenkai Liang (Princeton University)H-Index: 8
Last.Chung King Law (Princeton University)H-Index: 81
view all 5 authors...
Abstract Kinetic interactions between H2 and CO over PdO, a widely used catalyst in combustion systems, were studied experimentally and numerically. Global reaction parameters of H2 and CO oxidation over PdO were extracted from wire microcalorimetry experiments at atmospheric pressure in the temperature range 380–800 K, based on which a full catalytic reaction mechanism was developed. Comparison of ignition temperatures and heat release rates of different H2/CO blends along with density function...
#1Wenkai Liang (Princeton University)H-Index: 8
#2Yiru Wang (THU: Tsinghua University)
Last.Chung King Law (Princeton University)H-Index: 81
view all 3 authors...
Abstract Effects of ozone doping on the Z-shaped explosion boundary of stoichiometric hydrogen-oxygen mixtures are computationally studied. Results show that with increasing ozone doping and within a small range of increment, the explosion limit transitions from the Z-shaped response with two turning points to responses exhibiting four, six, four, two and none turning points. By modifying the rate coefficients of the sensitive reactions within the ozone sub-mechanism, four reactions are identifi...
#1Wenkai LiangH-Index: 8
#2Chung King LawH-Index: 81
This article reviews recent theoretical developments on incipient ignition induced by radical runaway in systems described by detailed chemistry. Employing eigenvalue analysis, we first analyze the...
#1Wenkai Liang (Princeton University)H-Index: 8
#2Zirui Liu (Princeton University)H-Index: 1
Last.Chung King Law (Princeton University)H-Index: 81
view all 3 authors...
Abstract The pressure-temperature explosion limits of H2/CH4/O2 mixtures were analyzed computationally and analytically. It is shown that, with the addition of around 5% of H2 to the mixture, the explosion limit evolves from being monotonic to the non-monotonic Z-shaped response characteristic of H2/O2 explosions. Such transition is much less sensitive compared to the H2/CO/O2 system, and is explained by the different responses of the kinetic parameters corresponding to O and OH radical competit...
#1Wenkai Liang (Princeton University)H-Index: 8
#2Weiyu Li (Princeton University)H-Index: 1
Last.Chung King Law (Princeton University)H-Index: 81
view all 3 authors...
Abstract The propagation of laminar hydrogen/air and methane/air flames in supercritical conditions was computationally simulated for the planar flame configurations, incorporating descriptions of supercritical thermodynamics and transport as well as high-pressure chemical kinetics. The inaccuracies associated with the use of ideal gas assumptions for various components of the supercritical description were systematically assessed with progressively more complete formulation. Results show that, ...
#1Shangpeng Li (THU: Tsinghua University)H-Index: 1
#2Wenkai Liang (Princeton University)H-Index: 8
Last.Chung King Law (Princeton University)H-Index: 81
view all 4 authors...
Abstract The non-monotonic ignition response of counterflowing premixed hydrogen/oxygen mixtures with nitrogen dilution versus heated nitrogen is studied numerically and theoretically. It is shown that the three ignition limits can be theoretically obtained by considering only the linear system involving at most only one radical in each reaction, while the influences of the nonlinear reactions, each involving two radicals, together with thermal feedback, introduce higher-order corrections, parti...
#1Wenkai Liang (Princeton University)H-Index: 8
#2Chung King Law (Princeton University)H-Index: 81
Last.Zheng Chen (PKU: Peking University)H-Index: 32
view all 3 authors...
Abstract Effects of Soret diffusion on the ignition of hydrogen/air mixtures by a heated kernel, and the structure and dynamics of the embryonic flame that is subsequently formed, were investigated numerically with detailed chemistry and transport. Results show that Soret diffusion leads to larger (smaller) minimum ignition energy (MIE) for relatively rich (lean) mixtures, that this effect is mainly engendered by the Soret diffusion of H 2 while that of the H radical is almost negligible, and th...
#1Wenkai Liang (Princeton University)H-Index: 8
#2R. Mével (THU: Tsinghua University)H-Index: 2
Last.Chung King Law (Princeton University)H-Index: 81
view all 3 authors...
Abstract The ZND structure of mixtures of n -heptane, oxygen and diluent has been investigated using a reduced reaction scheme that includes the low-temperature chemistry (LTC) pathways. It is shown that for high CO 2 contents (X CO2 > 0.82) such that the reaction temperature is relatively low, the structure is affected by LTC and exhibits two distinct stages of energy release caused by low- and high-temperature chemistry, respectively. Based on the ZND structures, the dynamic parameters such as...
#1Wenkai Liang (Princeton University)H-Index: 8
#2Chung King Law (Princeton University)H-Index: 81
Abstract The first-stage ignition delay of n-heptane/air mixtures is computationally studied using detailed mechanism and theoretically studied using eigenvalue analysis of simplified systems. Results show that the delay has a turnover behavior as temperature increases, being dominated by the competition of low-temperature branching and termination channels as well as the competition of forward and reverse reaction channels. As temperature increases to the intermediate range, the termination and...
#1Sheng Yang (Princeton University)H-Index: 4
#2Abhishek Saha (Princeton University)H-Index: 12
Last.Chung King Law (Princeton University)H-Index: 81
view all 5 authors...
In this paper we demonstrate the essential role of molecular diffusion in the structure and propagation of turbulent flames. We first show that mixtures whose concentrations are near or beyond the conventional flammability limits can be rendered to burn strongly in turbulence, provided the controlling molecular mass diffusivity of the mixture exceeds its thermal diffusivity, namely the mixture Lewis number ( Le ) is less than unity. The associated turbulent flame speeds in such cases can be orde...
12