A new type of tidal unit-vertical shaft tubular turbine is designed with high efficiency, large flow rate and low water head ,which has large power under the 2~3 meters water head. According to the data of the being installed tidal units and principles of tubular turbine’s design, the high efficiency vertical shaft tubular turbine was designed under large discharge and low head, which was suitable for the tidal power station. The design also considered the requirements of turbine’s size and the details of flow through the whole flow passage were attained. The turbine’s property was predicted by the 3-d numerical simulation software on the whole flow passage. Moreover, the influences of vertical shaft’s sizes were analyzed. And the terminal of vertical shaft with or without transverse brace and longitudinal brace were analyzed to get the influence. Considering the hydraulic performance of various methods, the best guide vane opening was chosen. The results show that, the turbine unit has the best performance on efficiency, hydraulic loss, etc. with the guide vane opening 62°, meeting the power station’s design requirements. The results show that the optimal designed flow passage’s efficiency reaches up to 88.4%, the flow rate becomes much larger and the power reaches 174.63kW. Without partial vortex, the flow pattern is smooth through the whole passage also with lower hydraulic loss.
In order to effectively extract nonstationary and nonlinear fault signature of hydropower units’ signals, a new method, based on Hilbert–Huang transform (HHT), is proposed. This method is used to carry out EMD (Empirical Mode Decomposition) analysis and Hilbert transform of signals firstly and then extract Hilbert spectrum to provide a basis for signal feature extraction. The vibration signal of upper brackets in hydropower units has been put forward with experimental analysis. The results suggest that the EMD can decompose vibration components in different frequency domain, which has intuitive physical meaning. Moreover, Hilbert spectrum also has a good resolution in time domain and frequency domain. Thus, HHT can be used to depict the fault signals effectively and lay the foundation of the fault pattern recognition.
With the development of industrialization,water pollution is becoming more and more serious,fresh water supplying is becoming more and more inadequate.Some specialists have already researched the methods and developed new equipments which can extract water from air,but considering the large size and weight, the equipments were not convenient carry for field drinking by people.To overcome the shortcomings, the portable photoelectric water extraction device from air is studied, it consists of four parts,there are solar energy supply system, control system, refrigeration system and purification system.The device adapts the advanced method by the solar energy refrigeration to dew, it has four folding solar panels to get the energy and two shells which size could be changed along a slider and fixed by pins.Therefore, the new device has some advantages such as high refrigeration coefficient, high water intake rate, continuous operation long time without sunshine and excellent portability.
Sustainable energy generation is becoming increasingly important. Our oceans are largely an untapped source of energy. This paper presents an innovative design method for converting the linear motion of ocean waves into electricity energy. The design principle and the construction details have been presented.
The digital imaging technology based on underwater laser line-scanning is one of the developing and effective technologies for underwater electro-optical imaging. According to the requirements of ocean salvages, rescues and marine resources explorations, the technical features of the digital imaging system are analyzed comprehensively, the structural characteristics are discussed and the hardware components are introduced. The design gives the supports to develop the digital imaging system using underwater laser line-scanning technology and has great significance for application.
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