In order to enhance the ultrasonic degradation rate of organic solutions,a metal plate is placed at the water–air interface of the ultrasonic cleaning tank.Initially,the distribution of the acoustic field in the ultr...In order to enhance the ultrasonic degradation rate of organic solutions,a metal plate is placed at the water–air interface of the ultrasonic cleaning tank.Initially,the distribution of the acoustic field in the ultrasonic water tank was calculated using the simulation software COMSOL.The simulation results demonstrated that the utilization of the metal plate can eliminate the standing-wave acoustic field to a certain extent.Subsequently,the pixel method was selected for a quantitative comparison of the cavitation area in the flume with and without the metal plate.The results demonstrated that,under specific conditions,the area of ultrasonic cavitation in the water tank can be expanded using a metal plate.Thereafter,an acoustic degradation experiment was designed to confirm the feasibility of the simulation method.Furthermore,the impacts of the amplitude of the incident ultrasonic pressure,frequency,and the height of the liquid level in the water tank on the cavitation area were investigated.展开更多
贵州省织金地区龙潭组煤层具有多、薄特点。与单一厚层状煤层相比,多煤层合采存在合采兼容性问题,易发生层间干扰,影响合采效果及资源动用程度。为了发挥煤层气井生产潜力,提高开发效益,亟需开展合采层位优选,建立多煤层开发序列。在研...贵州省织金地区龙潭组煤层具有多、薄特点。与单一厚层状煤层相比,多煤层合采存在合采兼容性问题,易发生层间干扰,影响合采效果及资源动用程度。为了发挥煤层气井生产潜力,提高开发效益,亟需开展合采层位优选,建立多煤层开发序列。在研究织金区块地质特征的基础上,开展了多煤层地质条件差异研究,结合排采实践及解吸理论,探讨了织金地区多煤层合采影响因素,优选了合采层位。多煤层合采主要受解吸液面高度、纵向跨度、压力梯度、供液能力、渗透率差异影响。织金区块上二叠统龙潭组主力煤层地层供液能力、压力梯度、渗透率差异较小,对合采效果影响较小。层间跨度和解吸液面高度差异是影响区块合层开采的关键因素,16,17,20,23,27,30号煤层90 m跨度可作为一个开发组合,大井组优选此6层煤合采获得2000 m 3/d稳定产量,证实合采层位优选方法正确。展开更多
Fuel and fuel quantity parameters provide important information for aircraft safe flight. The oil quantity measurement system is an important part of aircraft fuel test. Aiming at the high precision requirement of oil...Fuel and fuel quantity parameters provide important information for aircraft safe flight. The oil quantity measurement system is an important part of aircraft fuel test. Aiming at the high precision requirement of oil quantity measurement in aircraft ground fuel test, the oil quantity measurement system based on computer test is designed, which verifies the feasibility and rationality of the design scheme and control algorithm of the oil quantity measurement software, and saves a lot of time and manpower.展开更多
基金supported by the Doctoral Fund Program of Longdong University(Grant No.XYBYZK2219)the National Natural Science Foundation of China(Grant No.12274277)+1 种基金the Science and Technology Project of Gansu Province of China(Grant No.21JR11RM046)Young Doctor Fund of Gansu Education Department(Grant No.2022QB-171).
文摘In order to enhance the ultrasonic degradation rate of organic solutions,a metal plate is placed at the water–air interface of the ultrasonic cleaning tank.Initially,the distribution of the acoustic field in the ultrasonic water tank was calculated using the simulation software COMSOL.The simulation results demonstrated that the utilization of the metal plate can eliminate the standing-wave acoustic field to a certain extent.Subsequently,the pixel method was selected for a quantitative comparison of the cavitation area in the flume with and without the metal plate.The results demonstrated that,under specific conditions,the area of ultrasonic cavitation in the water tank can be expanded using a metal plate.Thereafter,an acoustic degradation experiment was designed to confirm the feasibility of the simulation method.Furthermore,the impacts of the amplitude of the incident ultrasonic pressure,frequency,and the height of the liquid level in the water tank on the cavitation area were investigated.
文摘贵州省织金地区龙潭组煤层具有多、薄特点。与单一厚层状煤层相比,多煤层合采存在合采兼容性问题,易发生层间干扰,影响合采效果及资源动用程度。为了发挥煤层气井生产潜力,提高开发效益,亟需开展合采层位优选,建立多煤层开发序列。在研究织金区块地质特征的基础上,开展了多煤层地质条件差异研究,结合排采实践及解吸理论,探讨了织金地区多煤层合采影响因素,优选了合采层位。多煤层合采主要受解吸液面高度、纵向跨度、压力梯度、供液能力、渗透率差异影响。织金区块上二叠统龙潭组主力煤层地层供液能力、压力梯度、渗透率差异较小,对合采效果影响较小。层间跨度和解吸液面高度差异是影响区块合层开采的关键因素,16,17,20,23,27,30号煤层90 m跨度可作为一个开发组合,大井组优选此6层煤合采获得2000 m 3/d稳定产量,证实合采层位优选方法正确。
文摘Fuel and fuel quantity parameters provide important information for aircraft safe flight. The oil quantity measurement system is an important part of aircraft fuel test. Aiming at the high precision requirement of oil quantity measurement in aircraft ground fuel test, the oil quantity measurement system based on computer test is designed, which verifies the feasibility and rationality of the design scheme and control algorithm of the oil quantity measurement software, and saves a lot of time and manpower.
