Method of Improving Pressure Fluctuation of Francis Pump Turbine

A water pump turbine, pressure pulsation technology, applied in hydropower, machine/engine, reaction engine, etc., can solve the problems of plant structure resonance, damage, and affecting the operation stability of the unit

Active Publication Date: 2016-01-20
HARBIN ELECTRIC MASCH CO LTD +3
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first phenomenon may cause hydraulic resonance between the rotating radial pressure mode and the runner or top cover structure, which may cause strong vibration, noise, cracking or damage to the moving vane bearing
The second phenomenon can cause resonance in the plant structure, generating unacceptable vibration and noise
The standing wave phenomenon may also affect the pressure steel pipe, thereby causing vibration of the hydraulic pipeline and affecting the operation stability of the unit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of Improving Pressure Fluctuation of Francis Pump Turbine
  • Method of Improving Pressure Fluctuation of Francis Pump Turbine
  • Method of Improving Pressure Fluctuation of Francis Pump Turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] A method for improving the pressure pulsation of a Francis water pump turbine, the implementation steps of which are as follows:

[0055] (1), determine the appropriate number of movable guide vanes, the specific method is as follows:

[0056] First, determine the pressure fields in the stationary and rotating parts,

[0057] The pressure field at rest is expressed as: P s ( θ s , t ) = Σ n = 1 ∞ B n cos ( nZ g θ s + φ n ) - - - ( 1 )

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for improving pressure pulsation of a mixed-flow type pump turbine. The method for improving the pressure pulsation of the mixed-flow type pump turbine comprises choosing the appropriate number Zg of movable guide vanes, defining the reasonable diameter Dg of a distribution circle of the guide vanes, defining the reasonable distance delta from a rotating wheel to a fixed edge and the like. The method for improving the pressure pulsation of a mixed-flow type pump turbine aims at achieving the purpose of improving forward pressure pulsation of a back rotating wheel of the guide vanes of the mixed-flow type pump turbine and improving the operational stability of a pump storage group.

Description

Technical field: [0001] The invention relates to a method for improving the pressure pulsation of a mixed flow water pump turbine. Background technique: [0002] With the increase of the operating head and unit capacity of the pumped storage unit, people pay more and more attention to its operation stability and vibration, which makes it very important to study a method to reduce the pressure fluctuation of the pump turbine. A pump-turbine operating under steady conditions causes pressure pulsations due to the interaction of rotating and stationary components. The interaction between the disturbance of the rotating flow caused by the runner blades (also known as the potential flow disturbance) and the disturbance of the water flow caused by the movable guide vane is called dynamic and static interference (RSI). This interaction causes pressure waves to propagate throughout the hydraulic machine. As a result of the RSI phenomenon, two different pressure pulsations can occur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): F03B3/18F03B3/12
CPCY02E10/20
Inventor高苏杰王国海李正林铭山陈元林王焕茂覃大清魏显著赵越刘万江吴喜东史千夏溢
OwnerHARBIN ELECTRIC MASCH CO LTD