为解决采样海水从吊放式采水器到储存分配系统对接传输问题,根据海水取样要求,提出了一套海水从采水器到分配储存系统的对接传输装置设计方案.对接传输装置由上定对接头和下对接座组成,其中上定对接头的导向爪组与下对接座的锥钢套采用...为解决采样海水从吊放式采水器到储存分配系统对接传输问题,根据海水取样要求,提出了一套海水从采水器到分配储存系统的对接传输装置设计方案.对接传输装置由上定对接头和下对接座组成,其中上定对接头的导向爪组与下对接座的锥钢套采用杆锥方式的粗对接,以补偿上定对接头滑套中心底锥孔与下对接座导向锥管的二次精对接定位误差,降低其定位精度要求.这样,从机械结构上保证了采水器到分配储存系统的海水偏心流道的O形密封圈装配要求.为了消除对接过程中各种变差对系统的影响,该装置采用了弹簧阻尼减震,再配以波纹管柔性连接补偿轴向位移及径向偏心,目的是为延长装置寿命.基于Solid Works Motion仿真还原了整个对接系统定心过程,揭示了装置中各种变差对系统的影响.再基于Solid Works Simulation仿真了导向爪组在对接过程中的受力状态,验证了整个装置结构设计的合理性.展开更多
Auto-ignition and heat release correlations for controlled auto-ignition(CAI)combustion were derived from extensive in-cylinder pressure data of a four-stroke gasoline engine operating in CAI combustion mode.Abundant ...Auto-ignition and heat release correlations for controlled auto-ignition(CAI)combustion were derived from extensive in-cylinder pressure data of a four-stroke gasoline engine operating in CAI combustion mode.Abundant experiments were carried out under a wide range of air/fuel ratio,speed and residual gas fraction to ensure that the combustion correlations can be used in the entire CAI engine operation range.Furthermore,a more accurate method to compute the residual gas fraction was proposed by calculating the working fluid temperature at the exhaust valve close timing in the experiments.The heat release correlation was described in two parts,one is for the first slower heat release process at low temperature,and the other is for the second faster heat release process at high temperature.Finally the heat release correlation was evaluated on the single cylinder gasoline engine running with CAI combustion by comparing the experimental data with the 1-D engine simulation results obtained with the aid of the GT-Power simulation program.The results show that the predicted loads and ignition timings match closely with the measurements.展开更多
The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling ...The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br（2P3/2） and Br（2P1/2） atoms from photodissociation of m-bromofluorobenzene have been measured at diff）rent photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via （pre-）dissociation of the two low-lying 1ππ excited states dominate the production process of the ground state Br（2P3/2） atoms. Because of the weak spin-orbit coupling eff）ct among the low-lying triplet and singlet states, the spin-orbit excited Br（2P1/2） atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.展开更多
文摘为解决采样海水从吊放式采水器到储存分配系统对接传输问题,根据海水取样要求,提出了一套海水从采水器到分配储存系统的对接传输装置设计方案.对接传输装置由上定对接头和下对接座组成,其中上定对接头的导向爪组与下对接座的锥钢套采用杆锥方式的粗对接,以补偿上定对接头滑套中心底锥孔与下对接座导向锥管的二次精对接定位误差,降低其定位精度要求.这样,从机械结构上保证了采水器到分配储存系统的海水偏心流道的O形密封圈装配要求.为了消除对接过程中各种变差对系统的影响,该装置采用了弹簧阻尼减震,再配以波纹管柔性连接补偿轴向位移及径向偏心,目的是为延长装置寿命.基于Solid Works Motion仿真还原了整个对接系统定心过程,揭示了装置中各种变差对系统的影响.再基于Solid Works Simulation仿真了导向爪组在对接过程中的受力状态,验证了整个装置结构设计的合理性.
基金Supported by State Key Project of Fundamental Research Plan(No.2007CB210004).
文摘Auto-ignition and heat release correlations for controlled auto-ignition(CAI)combustion were derived from extensive in-cylinder pressure data of a four-stroke gasoline engine operating in CAI combustion mode.Abundant experiments were carried out under a wide range of air/fuel ratio,speed and residual gas fraction to ensure that the combustion correlations can be used in the entire CAI engine operation range.Furthermore,a more accurate method to compute the residual gas fraction was proposed by calculating the working fluid temperature at the exhaust valve close timing in the experiments.The heat release correlation was described in two parts,one is for the first slower heat release process at low temperature,and the other is for the second faster heat release process at high temperature.Finally the heat release correlation was evaluated on the single cylinder gasoline engine running with CAI combustion by comparing the experimental data with the 1-D engine simulation results obtained with the aid of the GT-Power simulation program.The results show that the predicted loads and ignition timings match closely with the measurements.
基金financially supported by the National Key R&D Program of China(2017YFA0303502)the National Natural Science Foundation of China(No.21773221 and No.21727804)the Fundamental Research Funds for the Central Universities of China
文摘The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br（2P3/2） and Br（2P1/2） atoms from photodissociation of m-bromofluorobenzene have been measured at diff）rent photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via （pre-）dissociation of the two low-lying 1ππ excited states dominate the production process of the ground state Br（2P3/2） atoms. Because of the weak spin-orbit coupling eff）ct among the low-lying triplet and singlet states, the spin-orbit excited Br（2P1/2） atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.
