In the absorption chamber of a high-energy laser energy meter, water is directly used as an absorbing medium and the interaction of the high-power laser and the water flow can produce a variety of physical phenomena s...In the absorption chamber of a high-energy laser energy meter, water is directly used as an absorbing medium and the interaction of the high-power laser and the water flow can produce a variety of physical phenomena such as phase transitions. The unit difference method is adopted to deduce the phase transition model for water flow irradiated by a high-energy laser. In addition, the model is simulated and verified through experiments. Among them, the experimental verification uses the photographic method, shooting the distribution and the form of the air mass of water flow in different operating conditions, which are compared with the simulation results. The research shows that it is achievable to reduce the intensity of the phase transition by increasing the water flow, reducing the power intensity of the beam, shortening the distance the beam covers, reducing the initial water temperature or adopting a shorter wavelength laser. The study＇s results will provide the reference for the design of a water-direct-absorption-type high-energy laser energy meter as well as an analysis of the interaction processes of other similar high-power lasers and water flow.展开更多
This paper examines the two-phase flow for a horizontal well penetrating a naturally fractured reservoir with edge water injection by means of a fixed streamlinemodel,The mathematical model of the verical two-dimensio...This paper examines the two-phase flow for a horizontal well penetrating a naturally fractured reservoir with edge water injection by means of a fixed streamlinemodel,The mathematical model of the verical two-dimensional flow or oil-water for a horizontal well in a medium with double-porosity is established ,and whose accuratesolutions are obtained by using the characteristic method .The saturation distributionsin the fractured system and the matrix system as well as the formula of the time of water free production are presented .All these results provide a theoretical basis and a computing method for oil displacement by edge water from naturally fracturedreservirs.展开更多
棒材是国内产量占比较大的钢材品种,为了保证棒材质量,需对其实施无损检测。相控阵超声换能器基于惠更斯原理设计,通过电子激发控制实现超声声束的聚焦和偏转。水浸相控阵超声设备扫查效率快、灵敏度高,能够实现棒材全截面扫查,适用于...棒材是国内产量占比较大的钢材品种,为了保证棒材质量,需对其实施无损检测。相控阵超声换能器基于惠更斯原理设计,通过电子激发控制实现超声声束的聚焦和偏转。水浸相控阵超声设备扫查效率快、灵敏度高,能够实现棒材全截面扫查,适用于棒材产品的无损检测。使用相控阵超声设备前要对所有聚焦法则进行均一性校准,保证各聚焦法则的检测灵敏度差异在既定范围内。通过棒材检测实践,验证了水浸相控阵超声设备能够在500 mm/s进给速度下检测出棒材中大于0.7 mm FBH当量的夹杂物。展开更多
文摘In the absorption chamber of a high-energy laser energy meter, water is directly used as an absorbing medium and the interaction of the high-power laser and the water flow can produce a variety of physical phenomena such as phase transitions. The unit difference method is adopted to deduce the phase transition model for water flow irradiated by a high-energy laser. In addition, the model is simulated and verified through experiments. Among them, the experimental verification uses the photographic method, shooting the distribution and the form of the air mass of water flow in different operating conditions, which are compared with the simulation results. The research shows that it is achievable to reduce the intensity of the phase transition by increasing the water flow, reducing the power intensity of the beam, shortening the distance the beam covers, reducing the initial water temperature or adopting a shorter wavelength laser. The study＇s results will provide the reference for the design of a water-direct-absorption-type high-energy laser energy meter as well as an analysis of the interaction processes of other similar high-power lasers and water flow.
文摘This paper examines the two-phase flow for a horizontal well penetrating a naturally fractured reservoir with edge water injection by means of a fixed streamlinemodel,The mathematical model of the verical two-dimensional flow or oil-water for a horizontal well in a medium with double-porosity is established ,and whose accuratesolutions are obtained by using the characteristic method .The saturation distributionsin the fractured system and the matrix system as well as the formula of the time of water free production are presented .All these results provide a theoretical basis and a computing method for oil displacement by edge water from naturally fracturedreservirs.
文摘棒材是国内产量占比较大的钢材品种,为了保证棒材质量,需对其实施无损检测。相控阵超声换能器基于惠更斯原理设计,通过电子激发控制实现超声声束的聚焦和偏转。水浸相控阵超声设备扫查效率快、灵敏度高,能够实现棒材全截面扫查,适用于棒材产品的无损检测。使用相控阵超声设备前要对所有聚焦法则进行均一性校准,保证各聚焦法则的检测灵敏度差异在既定范围内。通过棒材检测实践,验证了水浸相控阵超声设备能够在500 mm/s进给速度下检测出棒材中大于0.7 mm FBH当量的夹杂物。
