Match!
Zheng Chen
Hunan University
116Publications
32H-index
3,265Citations
Publications 116
Newest
#1Xian jie Zhou (Hunan University)H-Index: 1
#2Zheng Chen (Hunan University)H-Index: 32
Last.Da zi ShenH-Index: 1
view all 7 authors...
Abstract In the present study, the position of the camshaft pivot center is controlled to achieve continuous variable valve events. An innovative mechanical continuous variable valve lift (CVVL) system with self-regulation of the valve timing is proposed in this regard. Based on the system, an effective design method for the profiles of intermediate cam and cam is emphatically presented. After the profiles are determined, the kinematic behavior is calculated through a kinematic model developed i...
1 CitationsSource
#1Peng DaiH-Index: 6
#2Zheng ChenH-Index: 32
Last.Mikhail A. LibermanH-Index: 1
view all 4 authors...
The advancement of highly boosted internal combustion engines (ICEs) with high thermal efficiency is mainly constrained by knock and super-knock respectively due to the end gas autoignition and detonation development. At the end of the compression stroke, the pressure wave propagation and reflection in a small confined space may greatly influence the end gas autoignition, leading to different autoignition characteristics from those in a large or open space. The present study investigates the tra...
#1Yuan Gao (PKU: Peking University)
#2Peng Dai (SU: Southern University and A&M College)
Last.Zheng Chen (PKU: Peking University)H-Index: 32
view all 3 authors...
Detonation development inside spark ignition engines can result in the so called super-knock with extremely high pressure oscillation above 200 atm. In this study, numerical simulations of autoigni...
Source
#1Zheng Chen (Hunan University)H-Index: 32
#2Xiaotai Wei (Hunan University)H-Index: 1
Last.Quanchang Zhang (Hunan University)H-Index: 4
view all 5 authors...
Source
#1Zheng Chen (Hunan University)H-Index: 32
#2Yaquan Ai (Hunan University)
view all 4 authors...
Abstract Knocking combustion of a natural gas spark ignition engine with the addition of n-butane was investigated. Specially, the effects of n-butane concentration on knock severity were quantitatively evaluated with engine full-load at various engine speeds. The results show that with an increase in n-butane concentration, the peaks of in-cylinder pressure and heat release rate increase, combustion duration is shortened, and CA50 is advanced. At high speeds, n-butane concentration has a more p...
Source
#1Xiongbo Duan (Hunan University)H-Index: 3
#2Yiqun Liu (WSU: Wayne State University)H-Index: 3
Last.Banglin Deng (SZU: Shenzhen University)H-Index: 3
view all 7 authors...
Abstract In this study, the effects of natural gas composition and compression ratio on thermodynamic and combustion characteristics were comprehensively investigated using a spark ignition liquefied natural gas engine modified from a heavy-duty compression ignition engine. LNG fuel samples with two different methane compositions and a series of compression ratios were tested and analyzed with the same boundary conditions at a lean burn condition of 1.38 excess air/fuel ratio. The results indica...
3 CitationsSource
#1C. Huang (PKU: Peking University)
#2C. Qi (PKU: Peking University)
Last.Zheng Chen (PKU: Peking University)H-Index: 32
view all 3 authors...
Accurate measurement of ignition delay in a shock tube is extremely important for developing chemical mechanisms of different fuels. In ideal shock-tube experiments, the test gas behind the reflected shock is expected to ignite uniformly. However, in practical shock-tube experiments, non-uniform ignition occurs due to different factors such as boundary layer growth and boundary layer–reflected shock interaction. Such non-uniform ignition greatly complicates the interpretation of measurements and...
Source
#1Haiyue Li (PKU: Peking University)H-Index: 1
#2Huangwei Zhang (NUS: National University of Singapore)H-Index: 7
Last.Zheng Chen (PKU: Peking University)H-Index: 32
view all 3 authors...
A theoretical model is developed to describe the spherical flame initiation and propagation. It considers endothermic chain-branching reaction and exothermic recombination reaction. Based on this model, the effects of endothermic chain-branching reaction on spherical flame initiation and propagation are assessed. First, the analytical solutions for the distributions of fuel and radical mass fraction as well as temperature are obtained within the framework of large activation energy and quasi-ste...
2 CitationsSource
#1Peng Dai (SU: Southern University and A&M College)H-Index: 6
#2Zheng Chen (PKU: Peking University)H-Index: 32
Last.Xiaohua Gan (SU: Southern University and A&M College)H-Index: 1
view all 3 authors...
Abstract Fuel-lean or diluted combustion is widely used in advanced internal combustion engines (ICEs) such as homogeneous charge compression ignition (HCCI) engines, low temperature combustion (LTC) engines, and engines utilizing exhaust gas recirculation (EGR). The thermal efficiency of ICEs is constrained by knock and super-knock due to end-gas autoignition and detonation development. Therefore, the effects of equivalence ratio and CO2 dilution on autoignition and detonation development induc...
3 CitationsSource
#1Peng Dai (SU: Southern University and A&M College)H-Index: 6
#2Zheng Chen (PKU: Peking University)H-Index: 32
Abstract Exhaust gas recirculation (EGR) technology can be used in internal combustion engines to reduce NOx emission and improve fuel economy. However, it also affects the end-gas autoignition and engine knock since NOx in EGR can promote ignition. In this study, effects of NOx addition on autoignition and detonation development in dimethyl ether (DME)/air mixture under engine-relevant conditions are investigated. Numerical simulation considering both low-temperature and high-temperature chemis...
2 CitationsSource
12345678910