Use of Computer Technology in Modernization of Head Covers for ПЛ 20-В-500 Kaplan Turbines
Journal Title: Проблеми машинобудування - Year 2018, Vol 21, Issue 1
Abstract
<p class="a">One of the problems faced by a designer in the modernization of operating generating units is the analysis of the feasibility of ensuring the strength and reliability of turbine parts and components in their further continuous operation under dynamic load or replacement of the turbine parts and components which would by optimal in terms of weight and dynamic behavior. It is possible to solve the above problem using computer technologies for dynamic study of load bearing structures of hydraulic turbines in various operating modes. This paper describes techniques developed to study the dynamic mode of deformation of hydraulic turbine head cover taking up the hydrodynamic pressure acting on its surface in contact with water and the weights of parts and components located on its surface. For the first time, the influence of added water masses of the structure is three-dimensionally considered using mathematical models based on hypersingular equations and combination of the finite element method and boundary element method. Application program packages are developed which are a powerful tool of automation in the determination of dynamic mode of deformation of the hydraulic turbine head cover. Numerical results are obtained allowing the evaluation of the dynamic mode of deformation taking into consideration the effect of water on the cast iron head cover of hydraulic turbine ПЛ 20-В-500 inoperation and subject to replacement as well as that on the welded steel head cover developed to replace the cast iron one. The numerical study is analyzed and recommendations are given for designing of the welded head cover which dynamical behavior allows preventing resonance phenomena and ensuring the operating reliability. The techniques used are validated by the regulatory document «Residual life prediction for water passage components of hydraulic turbines of HPPs and PSPs – Methodical Guidelines» SOU-N MEV 40.1–21677681–51: 2011.</p>
Authors and Affiliations
E. Strelnikova, T. Medvedovskaya, A. Linnik, O. Zelenskaya
Keywords
Related Articles
- EP ID EP622037
- DOI -
- Views 121
- Downloads 0
Stressed State in a Finite Cylinder with a Circular Crack at Non-stationary Torsion
This paper considers a solution to an axially symmetric dynamic problem of determining the stress-state in the vicinity of a circular crack in a finite cylinder. The cylinder lower base is rigidly fixed, and the upper on...
Minimization of the Stressed State of a Stringer Plate with a Hole and Rectilinear Cracks
As is known, thin plates with holes are one of the most common structural ele-ments. To increase their reliability and service life, it is of interest to find such a hole contour that ensures the minimum circumferential...
Methodology to Solve Multi-Dimentional Sphere Packing Problems
This paper discusses the problem of optimally packing spheres of various dimensions into containers of arbitrary geometrical shapes. According to the international classification, this problem belongs to Sphere Packing P...
Use of a Hydrogen Metal Hydride System to Increase Glass Production Efficiency
Today, the most effective means of using the energy potential of the secondary energy resources of industrial enterprises is the use of cogeneration utilization systems. This makes it possible to concurrently obtain both...
Higher order numerical method for aeroelastic problems
The accuracy of determining the conditions for the possible onset of uncontrolled oscillations of turbine blades depends on the accuracy and detail of the aerodynamic problem solution. An increased accuracy of the simula...