Subjects: Engineering and technical science >> Technology of Instrument and Meter Subjects: Engineering and technical science >> Metrology Subjects: Energy Science >> Survey of Energy Sources submitted time 2024-01-31
Abstract： This text mainly introduces the development and application of the remote online detection system of smart meters using "instrument cloud" high-precision computing. Firstly, the development process of traditional smart meter remote online detection system technology, as well as the limitations and challenges of these systems are introduced. Then, the origin of this topic is introduced, including the proposal of instrument virtualization technology in the "instrument cloud" environment, the research of instrument virtualization technology in the cloud computing environment, and the needs and challenges of the State Grid. This paper focuses on the development project of the remote online detection system of smart meters using "instrument cloud" high-precision computing, including the principle and application of instrument virtualization technology in the cloud computing environment, as well as the advantages and market prospects of the system. The development of this system will help solve the limitations and challenges of the traditional smart meter remote online detection system, improve the accuracy of measurement and intelligent diagnosis, and reduce the cost of the system, which is conducive to the popularization and application of the system.
Peer Review Status:
Awaiting Review
Subjects: Engineering and technical science >> Metrology Subjects: Engineering and technical science >> Technology of Instrument and Meter Subjects: Energy Science >> Survey of Energy Sources submitted time 2024-01-29
Abstract： This paper mainly introduces the remote automatic meter reading system technology of the State Grid in the early 90s of the 20th century, and with the introduction of electronic meters and smart meters, the local and remote communication technology has been rapidly updated, which has promoted the development of remote automatic meter reading system technology. From 2010 to 2018, the State Grid carried out the large-scale construction of the provincial power grid electricity information collection system, and invested a lot of money in the construction of collection equipment and user projects. By the end of 2018, the number of smart meters operated by the State Grid reached 458 million, and the user coverage rate of the electricity information collection system reached 99.87%. In the area of communication technology, the text refers to the development of local and remote communication methods. The local communication mode has undergone the evolution from narrowband powerline carrier communication technology to broadband powerline carrier communication technology, while the long-distance communication mode has successively adopted GPRS and 4G public network wireless communication. This paper also introduces the origin, development and gradual fading out of the market of narrowband CLC technology, as well as the rise and development of broadband CLC technology.
Peer Review Status:Awaiting Review
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics Subjects: Energy Science >> Survey of Energy Sources submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract：液体射流雾化常见于印刷、农业、燃烧设备中，然而雾化现象涉及到气液界面复杂的拓扑变化，使得雾化过程极其复杂。目前针对一次雾化的机理研究及模型尚不够准确，由于数值计算方法的快速发展，越来越多的研究者采用数值方法来研究一次雾化。本文采用大规模的直接数值模拟手段和Level Set追踪气液界面的方法模拟旋转射流的一次雾化过程，以揭示旋流雾化的机理和界面不稳定波的贡献。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics Subjects: Energy Science >> Survey of Energy Sources submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract： 致动面模型利用无厚度的平面代替风力机叶片，在平面上施加不连续压力来模拟叶片对气流的作用，结合N-S方程,在FLUENT中进行数值模拟计算，是对致动线方法的延伸与改进。运用该方法能够简化风力机的模型，从而减少网格数量和计算时间。采用线性分布下的致动面模型，提出一种致动面网格的辨识方法，对单台Nibe A型风力机的远近尾流区域进行模拟计算，包括尾流风速变化，湍流强度，涡结构,并将数值模拟的结果与致动线模型计算结果以及实验数据进行对比分析，主要是风轮后特定距离截面的风速变化，验证了致动面方法的优越性以及用于风力机尾流场计算的可行性。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics Subjects: Energy Science >> Survey of Energy Sources submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract：本文以压比为6.1的跨音速离心叶轮为研究对象，采用定常和非定常数值模拟分析了叶尖区域激波与泄漏涡的相互作用和泄漏涡的非定常特征。随着流量减小，激波与泄漏涡的相互作用增强，最终导致泄漏涡破裂。小流量下泄漏涡的破裂引起叶片载荷的变化，叶片载荷的变化反过来影响泄漏涡的强弱，如此形成一个非定常循环过程。单通道模拟得出非定常流动的频率为0.668 BPF, 双通道和三通道模拟得到的频率则为0.88 BPF。但三种模型得出的非定常机理相同。
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