Based on the theory of relativistic superstrong magnetic fields （SMFs）, by using the method of Thomas-Fermi-Dirac approximations, we investigate the problem of strong electron screening （SES） in SMFs and the influ...Based on the theory of relativistic superstrong magnetic fields （SMFs）, by using the method of Thomas-Fermi-Dirac approximations, we investigate the problem of strong electron screening （SES） in SMFs and the influence of SES on the nuclear reaction of 23Mg （p, Y）24A1. Our calculations show that the nuclear reaction will be markedly effected by the SES in SMFs in the surface of magnetars. Our calculated screening rates can increase two orders of magnitude due to SES in SMFs.展开更多
The effect of the electric field with different intensity on explosion wave pressure and flame propagation velocity of gas explosion was experimentally studied, and the effect of electric field on gas explosion and it...The effect of the electric field with different intensity on explosion wave pressure and flame propagation velocity of gas explosion was experimentally studied, and the effect of electric field on gas explosion and its propagation was theoretically analyzed from heat transportation, mass transportation, and reaction process of gas explosion. The results show that the electric field can affect gas explosion by enhancing explosion intensity and explosion pressure, thus increasing flame velocity. The electric field can offer energy to the gas explosion reaction; the effect of the electric field on gas explosion increases with the increase of electric field intensity. The electric field can increase mass transfer action, heat transfer action, convection effects, diffusion coefficient, and the reaction system entropy, which make the turbulence of gas explosion in electric field increase; therefore, the electric field can improve flame combustion velocity and flame propagation velocity, release more energy, increase shock wave energy, and then promote the gas explosion and its propagation.展开更多
提出一种将功率声源物理嵌入汽油机燃烧室的多场耦合燃烧数值模拟方法,利用功率超声馈入策略研究了缸内极端环境下工质活性与燃烧反应路径精细化调控特性。基于台架试验数据校正原机三维数值模型,通过在燃烧室嵌入功率声源面特征,构建...提出一种将功率声源物理嵌入汽油机燃烧室的多场耦合燃烧数值模拟方法,利用功率超声馈入策略研究了缸内极端环境下工质活性与燃烧反应路径精细化调控特性。基于台架试验数据校正原机三维数值模型,通过在燃烧室嵌入功率声源面特征,构建出声场与燃烧场耦合的多场数值模型,并利用动网格实现将频率20 kHz振幅30μm功率超声馈入汽油机缸内工作循环。通过对比分析4种超声馈入方案和无超声馈入方案的缸内燃烧数据,得出在压缩和点火燃烧阶段超声馈入燃烧室的S2方案对工质湍动能影响最为显著,其缸压峰值相比原机提升0.1 MPa,且各方案缸压曲线在0°CA TDC(top dead center,TDC)~30°CA ATDC(after top dead center,ATDC)出现明显分离。研究表明,合理利用功率超声馈入燃烧场能促进燃料氧化与燃烧进程,并加速OH自由基生成速率。在汽油机缸内瞬变极端燃烧环境下,低于10 ms的功率超声馈入已能对燃料活性及反应路径产生显著量化调控作用。展开更多
By introducing the Dirac δ-function and Pauli exclusion principle in the presence of superstrong magnetic fields （SMFs）, we investigate the influence of SMFs on beta decay and the change rates of electron fraction ...By introducing the Dirac δ-function and Pauli exclusion principle in the presence of superstrong magnetic fields （SMFs）, we investigate the influence of SMFs on beta decay and the change rates of electron fraction （CREF） of nuclides 56Fe, 62Ni, 64Ni and 6SNi in magnetars, which are powered by magnetic field energy. We find that the magnetic fields have a great influence on the beta decay rates, and the beta decay rates can decrease by more than six orders of magnitude in the presence of SMFs. The CREF also decreases by more than seven orders of magnitude in the presence of SMFs.展开更多
基金supported in part by the National Natural Science Foundation of China through grant No. 11565020the Natural Science Foundation of Hainan province under grant No. 114012the Undergraduate Innovation Program of Hainan province under grant No. 20130139
文摘Based on the theory of relativistic superstrong magnetic fields （SMFs）, by using the method of Thomas-Fermi-Dirac approximations, we investigate the problem of strong electron screening （SES） in SMFs and the influence of SES on the nuclear reaction of 23Mg （p, Y）24A1. Our calculations show that the nuclear reaction will be markedly effected by the SES in SMFs in the surface of magnetars. Our calculated screening rates can increase two orders of magnitude due to SES in SMFs.
基金Supported by the National Natural Science Foundation of China （51004048） the Research Fund of State Key Laboratory of Coal Resources and Safe Mining, CUMT（09KF05）+2 种基金 the Post-Doctoral Science Foundation of China （20100470998） the Scientific Research Fund of Hunan Provincial Education Department（09C409） the State Key Base Development Plan（2005cb221506）
文摘The effect of the electric field with different intensity on explosion wave pressure and flame propagation velocity of gas explosion was experimentally studied, and the effect of electric field on gas explosion and its propagation was theoretically analyzed from heat transportation, mass transportation, and reaction process of gas explosion. The results show that the electric field can affect gas explosion by enhancing explosion intensity and explosion pressure, thus increasing flame velocity. The electric field can offer energy to the gas explosion reaction; the effect of the electric field on gas explosion increases with the increase of electric field intensity. The electric field can increase mass transfer action, heat transfer action, convection effects, diffusion coefficient, and the reaction system entropy, which make the turbulence of gas explosion in electric field increase; therefore, the electric field can improve flame combustion velocity and flame propagation velocity, release more energy, increase shock wave energy, and then promote the gas explosion and its propagation.
文摘提出一种将功率声源物理嵌入汽油机燃烧室的多场耦合燃烧数值模拟方法,利用功率超声馈入策略研究了缸内极端环境下工质活性与燃烧反应路径精细化调控特性。基于台架试验数据校正原机三维数值模型,通过在燃烧室嵌入功率声源面特征,构建出声场与燃烧场耦合的多场数值模型,并利用动网格实现将频率20 kHz振幅30μm功率超声馈入汽油机缸内工作循环。通过对比分析4种超声馈入方案和无超声馈入方案的缸内燃烧数据,得出在压缩和点火燃烧阶段超声馈入燃烧室的S2方案对工质湍动能影响最为显著,其缸压峰值相比原机提升0.1 MPa,且各方案缸压曲线在0°CA TDC(top dead center,TDC)~30°CA ATDC(after top dead center,ATDC)出现明显分离。研究表明,合理利用功率超声馈入燃烧场能促进燃料氧化与燃烧进程,并加速OH自由基生成速率。在汽油机缸内瞬变极端燃烧环境下,低于10 ms的功率超声馈入已能对燃料活性及反应路径产生显著量化调控作用。
基金supported by the National Natural Science Foundation of China (Grant No. 11565020)the Counterpart Foundation of Sanya (Grant No. 2016PT43)+2 种基金the Special Foundation of Science and Technology Cooperation for Advanced Academy and Regional of Sanya (Grant No. 2016YD28)the Natural Science Foundation of Hainan province (Grant No. 114012)the Natural Science Foundation of Jiangxi Province (Grant No. 20132BAB212005)
文摘By introducing the Dirac δ-function and Pauli exclusion principle in the presence of superstrong magnetic fields （SMFs）, we investigate the influence of SMFs on beta decay and the change rates of electron fraction （CREF） of nuclides 56Fe, 62Ni, 64Ni and 6SNi in magnetars, which are powered by magnetic field energy. We find that the magnetic fields have a great influence on the beta decay rates, and the beta decay rates can decrease by more than six orders of magnitude in the presence of SMFs. The CREF also decreases by more than seven orders of magnitude in the presence of SMFs.
