To study the configuration and conductivity effects on micro-scale methane-air flames by electric field and iron wind,different electric field forces and iron winds are generated by needle,circle and plate electrodes ...To study the configuration and conductivity effects on micro-scale methane-air flames by electric field and iron wind,different electric field forces and iron winds are generated by needle,circle and plate electrodes respectively in different electrodes heights under both AC and DC fields though experiments. Experimental results showed that the flame characteristics are affected by needle electrodes mainly through the action of ion wind,by plate type electrodes mainly through the action of electric field force and by annular electrodes through both the electric field force and ion wind at the same time. Under DC field 's effects of all electrodes types,the flame will consequently go down while the voltage reached to a limit value,and it will breakdown under the strong effect of the ion wind by needle electrodes. The results also showed the influence by different electrodes types to the current characteristics,resistance properties and configuration of themicro-scale flames.展开更多
The mixed terrains of terramechanics research are mainly composed of static stones and loose soil.The movement behavior of stones is often ignored while analyzing the influence of the wheel’s traction performance cau...The mixed terrains of terramechanics research are mainly composed of static stones and loose soil.The movement behavior of stones is often ignored while analyzing the influence of the wheel’s traction performance caused by mixed terrain.When a wheel is in contact with the movable stone and with the loose soil at the same time,the residual soil model,therefore,is proposed to simulate the change of the contact force between the wheel and the remaining loose soil caused by the failure of the loose soil in the area covered by stone.The plastic homogeneous soil mechanics model is proposed based on the soil’s mechanical properties.It is used for simulating the reaction force provided by soil to the moving stones.These mechanical models are compiled into the simulation programs,which are called by Adams to calculate the contact forces and moments of the planetary rover’s wheels in the mixed terrain with the movable stone and loose soil.Carrying out soil bin tests under the same experimental conditions,the comparative analysis of the simulation and experiment for a wheel in contact with 4 types of stones shows that the comparison results are in good agreement,which can verify the effectiveness of the proposed models to an extent.展开更多
基金Sponsored by National Natural Science Foundation of China(Grant No.51376021)
文摘To study the configuration and conductivity effects on micro-scale methane-air flames by electric field and iron wind,different electric field forces and iron winds are generated by needle,circle and plate electrodes respectively in different electrodes heights under both AC and DC fields though experiments. Experimental results showed that the flame characteristics are affected by needle electrodes mainly through the action of ion wind,by plate type electrodes mainly through the action of electric field force and by annular electrodes through both the electric field force and ion wind at the same time. Under DC field 's effects of all electrodes types,the flame will consequently go down while the voltage reached to a limit value,and it will breakdown under the strong effect of the ion wind by needle electrodes. The results also showed the influence by different electrodes types to the current characteristics,resistance properties and configuration of themicro-scale flames.
文摘The mixed terrains of terramechanics research are mainly composed of static stones and loose soil.The movement behavior of stones is often ignored while analyzing the influence of the wheel’s traction performance caused by mixed terrain.When a wheel is in contact with the movable stone and with the loose soil at the same time,the residual soil model,therefore,is proposed to simulate the change of the contact force between the wheel and the remaining loose soil caused by the failure of the loose soil in the area covered by stone.The plastic homogeneous soil mechanics model is proposed based on the soil’s mechanical properties.It is used for simulating the reaction force provided by soil to the moving stones.These mechanical models are compiled into the simulation programs,which are called by Adams to calculate the contact forces and moments of the planetary rover’s wheels in the mixed terrain with the movable stone and loose soil.Carrying out soil bin tests under the same experimental conditions,the comparative analysis of the simulation and experiment for a wheel in contact with 4 types of stones shows that the comparison results are in good agreement,which can verify the effectiveness of the proposed models to an extent.
