Inlet Passage’s Development and Optimization of New Tidal Unit-Shaft Tubular Turbine

Abstract

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.

Effect of Tip Clearance Size on Tubular Turbine Leakage Characteristics

“…As a resource for sustainable development, green energy has attracted increasing attention from researchers and industries [1][2][3]. Therefore, in recent years, the trend of developing renewable and clean energy has been increasing, with hydropower playing an important role and developing at an unprecedented rate [4][5][6]. Among them, the tubular turbine has the advantages of a short construction period, small investment, large excess flow, high efficiency, good cavitation performance, and fewer blades.…”

Optimization Study of Shaft Tubular Turbine in a Bidirectional Tidal Power Station

“…Tidal power generated by falling and rising water, which is a kind of potential energy [1], can transform mechanical energy into electricity. More specifically, a dam is built to back up the water located adjacent to bays or estuaries which are separate from the ocean and therefore form a reservoir.…”