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On the Intelligent Optimization of the Crevice Structure in a rapid compression machine

Journal of Thermal Science 2024年第3期33卷 1200-1215页

作者： GUO Qiang LIU Jie WU Yingtao WANG Hewu TANG Chenglong YU Ruiguang Department of Power Mechanical Engineering Beijing Jiaotong UniversityBeijing100044China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China Beijing Key Laboratory of New Energy Vehicle Powertrain Technology Beijing100044China National International Science and Technology Cooperation Base Beijing Jiaotong UniversityBeijing100044China

In this study,the multi-objective intelligent optimization of the crevice structure in a rapid compression machine(RCM)is carried out based on the RCM simulation model modified with the KIVA-3V program.A multi-objective optimization simulation model of the crevice structure based on the large eddy simulation model coupled with the genetic algorithm NSGA-Ⅲis *** optimization parameters and seven optimization objectives are selected in the optimization *** results show that the genetic algorithm can quickly find the values of the optimized *** crevice volume ratio shows a trade-off relationship with the dimensionless temperature ratio T_(max)/T_(aver)and the tumble ratio.A larger crevice volume can reduce the flow of boundary layer cryogenic gas into the combustion chamber,thus improving the temperature *** addition,the crevice entrance width and the connecting channel length should be smaller,while the volume of the crevice main chamber should be larger,so as to sufficiently introduce the low-temperature gas of the boundary layer into the crevice and reduce their influence on the temperature field of the combustion *** the crevice volume accounts for10%of the total volume,the temperature uniformity of the combustor is significantly enhanced,and when the crevice volume accounts for 30.4%,there is almost no low-temperature vortex in the combustion chamber.

关键词： rapid compression machine adiabatic core area ignition delay period crevice structure

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Autoignition of butanol isomers/n-heptane blend fuels on a rapid compression machine in N_2/O_2/Ar mixtures

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Science China(Technological Sciences) 2014年第3期57卷 461-470页

作者： YANG Zheng WANG Yue YANG Xin QIAN Yong LU XingCai HUANG Zhen Key Laboratory for Power machinery and Engineering of M. O. E. Shanghai Jiao Tong University

Ignition delay times of butanol isomers/n-heptane mixture were measured using a rapid compression machine at compressed pressures of 15,20 and 30 bar,in the compressed temperature range of 650–830 K and equivalence ratio of *** analysis and reaction fluxes analysis were performed using a detailed mechanism of blend fuels so as to evaluate the impact of n-heptane addition and temperature variation on the ignition and combustion *** the experimental conditions in this study,the blend fuels displays apparent low and high temperature reactions and a negative-temperature-coefficient(NTC)*** increasing butanol isomers mole fraction in the mixtures,the ignition delay times *** is worth noting that the suppression to n-heptane ignition from tert-butanol is very *** ignition delay time of 40/60 tert-butanol/n-heptane mixture is smaller than other three kinds of *** the increasing of tert-butanol mole fraction,the increasing range of its ignition delay time is very ***,compressed pressure has a limited effect on the ignition of blend mixture at low temperature but certain influence at medium temperature ***-butanol/n-heptane mixture is not sensitive to the *** chemical analysis indicates that butanol isomers also present the NTC behavior because of the low temperature reactivity radicals pool produced by *** fluxes analysis shows that the n-heptane addition has little impact on the reaction *** analysis shows that for the pure n-butanol,2-butanol and iso-butanol fuel,H-abstraction from the?-carbon plays the dominant role in the reactions having the inhibiting effect on the low-temperature branching,while the H-abstraction from the?-carbon can promote the ignition;for tert-butanol/n-heptane mixtures,reaction R16.H2O2(+M)OH+OH(+M)plays the leading *** n-butanol/n-heptane,iso-butanol/n-heptane mixtures,the major promoting reactions include some H-abstraction fr

关键词： butanol isomers blend fuels ignition delay rapid compression machine chemical kinetics

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Methane Concentration Influence on Combustion in a rapid compression machine under DFICE Relevant Conditions

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Journal of Mechanics Engineering and Automation 2023年第2期13卷 40-53页

作者： R.Clemente-Mallada A.Peter S.Riess L.Strauss H.Fajri M.Wensing Fluid Systems Engineering Friedrich-Alexander UniversityCauerstrasse 4Erlangen-Tennenlohe 91058Germany

In this experimental work,an optically accessible rapid compression machine is used to study the ignition and combustion process under engine relevant operation conditions for five different air-natural gas equivalence ratios(λ)ignited with either 12.2 mg or 6.7 mg of pilot diesel injected at 1,600 *** temperature of the ambient mixture,walls and injector was 333 ***,for the short(6.7 mg)diesel injection,the variation in the ID(ignition delay)for two higher ambient temperatures(343 K and 353 K)was *** and piston displacement are recorded while two high-speed cameras simultaneously capture signals in the visible range spectrum and at 305 nm wavelength for OH^(*)chemiluminescence *** is measured both from OH^(*)and pressure *** the recorded data,the heat release ratio is estimated and compared with the visual *** gives an insight of the temporal and spatial evolution of the flame,as well as a qualitative perception of the transition from spray ignition into a premixed flame in the ambient fuel-air *** was found that increasing the methane concertation delays the ignition,reduces the natural flame luminosity and enhances the OH^(*)chemiluminescence signal.

关键词： Dual-fuel natural gas diesel rapid compression machine ID.

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An experimental and modeling study of n-hexadecane autoignition under low-to-intermediate temperatures

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Science China(Technological Sciences) 2020年第5期63卷 719-730页

作者： YU Liang WANG WenYu WANG SiXu FENG Yuan QIAN Yong LU XingCai Key Laboratory for Power machinery and Engineering of M.O.E. Shanghai Jiao Tong UniversityShanghai 200240China

N-hexadecane is a potential candidate of diesel surrogate fuels and is also the largest linear alkane(n-alkanes)with known chemical kinetic *** objective of this study is to investigate the autoignition characteristics of n-hexadecane in the lowto-intermediate temperature region and to validate the existing kinetic *** this study,the ignition delay times(IDTs)of nhexadecane were measured using a heated rapid compression machine(RCM)at two pressures of 7 and 10 bar,and over equivalence ratios ranging from 0.5 to ***-stage ignition characteristic and the negative temperature coefficient(NTC)behavior of total ignition delay time were experimentally *** study paid special attention to the influence of pressure,equivalence ratio,and oxygen content on the IDTs of *** is observed that both the total IDTs and the first-stage IDTs decrease with the rise of those *** is worth noting that the first-stage IDT is found to show a greater dependence on temperature but a weaker dependence on other parameters compared to the total *** observed IDT dependence in the lowtemperature region(LTR)were quantitatively described by ignition delay time *** newly measured IDTs were then validated against two kinetic models(LLNL and CRECK).Simulation results show that both models underpredict the first-stage IDT but generally capture the temperature *** CRECK model well predicts the total IDTs of n-hexadecane while the LLNL model significantly underpredicts the total IDTs at most investigated *** the best of our knowledge,this study is the first investigation on n-hexadecane autoignition under low-to-intermediate temperatures,which deepens the understanding of large n-alkane oxidation and contributes to the improvement of the existing kinetic models.

关键词： n-hexadecane autoignition rapid compression machine low-temperature reactivity ignition delay time kinetic model

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