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| 1 | Large eddy simulation and proper orthogonal decomposition analysis of turbulent flows in a direct injection spark ignition engine:Cyclic variation and effect of valve lift显示文摘Large eddy simulation(LES)is used to calculate the in-cylinder turbulent flow field in a direct injection spark ignition(DISI)engine.The computations are carried out for three different maximum valve lifts(MVL)and throughout 100 consecutive engine cycles.The simulated results as well as corresponding particle image velocimetry(PIV)measurement database are analyzed by the proper orthogonal decomposition(POD)method.Through a new developed POD quadruple decomposition the instantaneous in-cylinder flow fields are decomposed into four parts,named mean field,coherent field,transition field and turbulent field,respectively.Then the in-cylinder turbulent flow characteristics and cycle-to-cycle variations(CCV)are studied separately upon the four part flow fields.Results indicate that each part exhibits its specific characteristics and has close connection with others.The mean part contains more than 50%of the total kinetic energy and the energy cascade phenomenon occurs among the four part fields;the coherent field part possesses the highest CCV level which dominates CCV of the bulk flow.In addition,it is observed that a change in MVL affects significantly the in-cylinder flow behavior including CCV,especially for the coherent part.Furthermore,the POD analysis demonstrates that at least 25 sample cycles for the mean velocity and 50 sample cycles for the RMS velocity are necessary for obtaining converged and correct results in CCV. | QIN WenJin XIE MaoZhao JIA Ming WANG TianYou LIU DaMing | 2014 | Science China(Technological Sciences)2014，57，3： | 11 |
| 2 | Experimental study on combustion characteristics of Chinese RP-3 kerosene显示文摘In order to illustrate the combustion characteristics of RP-3 kerosene which is widely used in Chinese aero-engines, the combustion characteristics of RP-3 kerosene were experimentally investigated in a constant volume combustion chamber. The experiments were performed at four different pressures of 0.1 MPa, 0.3 MPa, 0.5 MPa and 0.7 MPa, and three different temperatures of 390 K,420 K and 450 K, and over the equivalence ratio range of 0.6–1.6. Furthermore, the laminar combustion speeds of a surrogate fuel for RP-3 kerosene were simulated under certain conditions. The results show that increasing the initial temperature or decreasing the initial pressure causes an increase in the laminar combustion speed of RP-3 kerosene. With the equivalence ratio increasing from 0.6 to 1.6, the laminar combustion speed increases initially and then decreases gradually.The highest laminar combustion speed is measured under fuel rich condition(the equivalence ratio is 1.2). At the same time, the Markstein length shows the same changing trend as the laminar combustion speed with modification of the initial pressure. Increasing the initial pressure will increase the instability of the flame front, which is established by decreased Markstein length. However, different from the effects of the initial temperature and equivalence ratio on the laminar combustion speed,increasing the equivalence ratio will lead to a decrease in the Markstein length and the stability of the flame front, and the effect of the initial temperature on the Markstein length is unclear. Furthermore, the simulated laminar combustion speeds of the surrogate fuel agree with the corresponding experimental datas of RP-3 kerosene within 10% deviation under certain conditions. | Ma Hongan Xie Maozhao Zeng Wen Chen Baodong | 2016 | Chinese Journal of Aeronautics2016，29，2： | 9 |
| 3 | Numerical Investigation on Porous Media Quenching Behaviors of Premixed Deflagrating Flame using RANS/LES Model显示文摘To understand the mechanism of premixed flame quenching by porous media,a zonal hybrid RANS/LES model was employed,in which the LES flow solver was used to resolve the large turbulent structures within the non-porous region,while RANS was applied to porous media zone.The predicted results were compared with previous experimental data.And it was evident that the premixed flame propagation rates and structure as well as quenching behaviors were reproduced by this numerical approach with a better accuracy.Due to the inherently higher heat transfer coefficients between the solid and gas phases in porous media,the gas phase temperature has been decreased rapidly.However,upstream obstacles can cause the flame propagating faster and thus reduce the axial gas temperature gradients,resulting in the invalidity of the operation of premixed flame quenching.By comparison with the case without upstream obstacle,the values of reaction rate attained in the case with three pairs of obstacles are higher,which makes a positive impact on the flame passing through the porous medium.In addition,the porous media with greater pore density has an excellent flame quenching property mainly owing to both the larger volumetric heat transfer and higher quenching temperature. | WEN Xiaoping SU Tengfei LIU Zhigang XIE Maozhao WANG Fahui LIU Zhichao | 2019 | Journal of Thermal Science2019，28，4： | 4 |
| 4 | Numerical study on the compression ignition of a porous medium engine显示文摘Homogeneous and stable combustion can be realized in a porous medium (PM) engine where a chemically inert PM is mounted in the combustion chamber. To understand the mechanism of the PM engine, we simulated the working process of a PM engine fueled with natural gas (CH4) using an improved version of KIVA-3V and investigated the effects of the initial PM temperature, the PM structure as well as the fuel injection timing on the compression ignition of the engine. The im- proved version of KIVA-3V was verified by simulating the experiment of Zhdanok et al. for the superadiabatic combustion of CH4-air mixtures under filtration in a packed bed. The numerical results are in good agreement with experimental data for the speed of combustion wave. Computational results for the PM engine show that the initial PM temperature is the key factor in guaranteeing the onset of com- pression ignition of the PM engine at a given compression ratio. The PM structure affects greatly both convective heat transfer between the gas and solid phase in the PM and the dispersion effect of the PM. Pore diameter of the PM is a crucial factor in determining the realization of combustion in the PM engine. Over-late fuel injec- tion timing (near TDC) cannot assure a compression ignition of the PM engine. | ZHAO ZhiGuo XIE MaoZhao | 2008 | Science China(Technological Sciences)2008，51，3： | 2 |
| 5 | The breakup and atomization of a viscous liquid jet 显示文摘 | YI SHIJUN XIE MAOZHAO CHEN BAIXIN | 1996 | ACTA Mechanica SINICA (English Series)1996，12，2： | 1 |
| 6 | The breakup and atomization of a viscous Liquid Jet 显示文摘 | Yi Shijun Xie Maozhao Chen Baixin | 1996 | ACTA MECHANICA SINICA1996，12，： | 1 |
| 7 | Experimental and nu-merical investigation on performance of a porous medium burner withreciprocating flow显示文摘 | Xie Maozhao Shi Junrui Deng Yangbo | 2009 | Fuel2009，88，： | 1 |
| 8 | Experimental and numerical investigation on performance of a porous medium burner with reciprocating flow显示文摘 | Xie Maozhao Shi Junrui Deng Yangbo | | 0，，01： | 1 |
| 9 | Numerical simu- lation and theoretical analysis of premixed low-velocity fil- tration combustion 显示文摘 | Shi Junrui Xie Maozhao Liu Hong | 2008 | International Journal of Heat andMass Transfer2008，51，： | 1 |
| 10 | The Breakup and Atomization of a Viscous Liquid Jet显示文摘 | Yi Shijun Xie Maozhao Chen Baixin | 1996 | ACTA Mechanica SINICA (English Series)1996，12，2： | 1 |
| 11 | Double diffu- sion dynamic model simulation and turbidity experiment for a solar pond 显示文摘 | Xie Maozhao Ge Shaocheng Sun Wence | 2006 | Journal of Thermal Science2006，15，2： | 1 |
| 12 | Numericalsimulation and theoretical analysis of premixed low-velo-city filtration combustion 显示文摘 | Shi Junrui Xie Maozhao Liu Hong | 2008 | International Journal ofHeat and Mass Transfer2008，51，78： | 1 |
| 13 | Enhancement on a skeletal kinetic model for primary reference fuel oxidation by using a semidecoupling methodology显示文摘 | LIU Yaodong JIA Ming XIE Maozhao | 2012 | Energy&Fuels2012，26，12： | 1 |
| 14 | Experimen- tal and Numerical Studies on Inclined Flame Evolution in Packing Bed 显示文摘 | SHI Junrui XIE Maozhao XUE Zhijia | 2012 | International Journal of Heat and Mass Transfer2012，55，2324： | 1 |
| 15 | The breakup and atomization of a viscous liquid jet显示文摘 | Yi Shijun Xie Maozhao Chen Baixin | 1996 | ACTA Mechanica SINICA (English Series)1996，12，2： | 1 |
| 16 | The breakup and atomization of a viscous liquid jet显示文摘 | Yi Shijun Xie Maozhao Chen Baixin | 1996 | ACTA Mechanica SINICA ( English Series)1996，12，2： | 1 |
| 17 | Experimental and numerical investigation on performance of a porous me- dium burner with reciprocating flow 显示文摘 | Maozhao Xie Junrui Shi Yangbo Deng | 2009 | Fuel2009，88，： | 1 |
| 18 | The Breakup and Atomization of a Viscous Liquid Jet显示文摘 | Yi Shijun Xie Maozhao Chen Baixin | 1996 | ACTA Mechanica Sinica (English Series)1996，12，2： | 1 |
| 19 | Numerical simulation and theoretical analysis of low-velocity filtration combustion of lean mixture 显示文摘 | Shi Junrui Xie Maozhao Liu Hong Li Gang ZhouLei | 2008 | International Journal of Heat and Mass Transfer2008，51，： | 1 |
| 20 | Multi-dimensional Modeling of the Application of Catalytic Combustion to Homogeneous Charge Compression Ignition Engine显示文摘金老催化剂上的甲烷的详细表面反应机制被分析。在数字模拟和实验之间的比较显示出一个基本协议。同类的费用压缩的燃烧过程表面与催化剂(金老和铂) 是其活塞涂的点火(HCCI ) 引擎数字地被调查。有详细化学动力学的一个多维的模型被造。预定的点火上的催化燃烧的效果,温度和公司集中地,和 HC,公司和 HCCI 引擎的 NOx 排出物被讨论。结果证明 HCCI 引擎预定的点火是先进的, HC 和公司的排出物被催化作用减少。关键词催化燃烧 - 同类的费用压缩点火(HCCI )- CFD - 甲烷 - 详细化学动力学 CLC 数字 | Wen Zeng MaoZhao Xie | 2006 | Journal of Thermal Science2006，15，4： | 1 |
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