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Influence of Hydraulic Excitation on Dynamic Characteristics of the Main Shaft System of Francis Turbine-Generator Units

Author: ZhangYongHui
Tutor: CaiGanWei
School: Guangxi University
Course: Mechanical Design and Theory
Keywords: Water incentive Francis turbine generator units Rotating eccentric Dynamic characteristic Natural frequency Critical speed Response
CLC: TK733.1
Type: Master's thesis
Year: 2008
Downloads: 59
Quote: 0
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Abstract


For a long time, the intense vibration phenomenon of hydro-generating unit has been hovering at around the hydropower station, seriously affect the safe operation of the hydropower stations. Together in high head and large discharge and the strong electromagnetic field, the law is very mysterious, one has yet to completely solve the problem. Incentives affect the dynamic characteristics of the spindle system of hydro-generating unit with the applicable head and the continuous improvement of the unit capacity of the turbine runner flow more and more important. Therefore, to study the flow of the Francis turbine runner flow characteristics and water incentive runner investigated predecessors had a runner water under the eccentric movement analysis to determine the flow of water at this time to encourage respect for fundamental improve the dynamic characteristics of the hydro-generating unit has an extremely important significance. Turn turns the flow state of the water flow in the tract and flow excitation in the previous literature, is not considered turning vibration eccentric and rotation of the eccentric case, while the operation of the unit in the runner vibration eccentric and rotating eccentric is actually exist, and the two runner channel water flow status and flow incentives also exist, so turn research into account two turns when the water flow within the channel state of motion and flow incentive necessary. This article analyzes the movement from the flow within the runner, by analyzing the flow of water in the turbine runner blade inlet and at the outlet of the flow velocity triangles, obtained the water flow in the runner blade into the circumferential component of the absolute speed of the exit flow, consider wheel vibration eccentric and rotating eccentric state of motion of the runner flow occurred not consider these factors change, and deduce this time water flow within the runner of Francis turbine generator units flow excitation of the spindle, the flow excitation here includes the hydraulic parameters of the generator electromagnetic parameters and the structural parameters of the spindle system, not only associated with the electromagnetic torque of the generator, but also the system with the the hydrogenerator group spindle rotational inertia associated, This next step coupling dynamics analysis to provide some reference. Taking into account the water incentives and other radial load on the Francis turbine generator units spindle system. Simulation of the typical position of the spindle system response trajectory consider turning vibration eccentric and rotation of the eccentric and not considering both the case of steady-state unbalance.

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CLC: > Industrial Technology > Energy and Power Engineering > Water, energy, hydraulic machinery > Hydraulic prime mover,turbine > The counterattack hydraulic prime mover > Francis turbine
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