Determination of parameters of cavitation self-oscillation in hydraulic system under simultaneous longitudinal oscillation of pipe structure and fluid
Journal Title: Технічна механіка, Техническая механика, Technical Mechanics - Year 2014, Vol 3, Issue 3
Abstract
The paper deals simultaneous longitudinal oscillation of feed pipes of liquid rocket engines (LRE) and flu-ids. Cavities, normally occurring in operations of LRE pumps, can result in self-excited low-frequency of the fluid flow and pressure oscillation designated as cavitation oscillations. They may be hazardous because cavitation oscillation can disturb the normal operation of the propulsion system. A range of frequencies of cavitation oscillation (from 0 to 50 Hz) and a range of proper frequencies of oscillation of the pipe structure in a longitudinal direction can cross each other. The goal of this work is to develop a nonlinear mathematical model of simultaneous longitudinal oscillation of the feed pipe structure and the fluid and to derive parameters of self-excited cavitation oscillation. Simultane-ous longitudinal oscillation of the LRE feed pipe and fluid are modeled mathematically for the bench hydraulic system with the cavitating centrifugal impeller pump of the LRE. It is shown that the most interaction of oscillatory circuits of the fluid and the pipe structure is found with closely related partial frequencies of oscillation of the fluid and the pipe structure. It is accompanied by the drop in values of oscillatory amplitudes of the fluid pressures at the pump inlet as well as maximum values of oscillato-ry amplitudes of longitudinal force and longitudinal displacement of the pipe structure. The calculating results are in good agreement with the experimental results.
Authors and Affiliations
S. Dolgopolov
Keywords
Related Articles
- EP ID EP359150
- DOI -
- Views 64
- Downloads 0
Synthesis of observer of extended state vector considering requirements for closed loop of control given in frequency domain
To consider a closed loop of a combined control system, a procedure for the synthesis of an extended state observer is proposed. Requirements for the specified quality and the stability of the closed loop of the control...
Effects of high-speed cooling on physical and mechanical properties of AMg6 aluminum alloy after high-temperature heating
The effects of high-speed cooling on the physical and mechanical properties of the AMg6 aluminum alloy after high-temperature heating have been examined. An experimental procedure for improving the material viscosity in...
Effect of working portion slope of worn wheel flange for a comprehensively retrofitted bogie of freight car on wheel wear
The work objective was to estimate the effects of an increase in the slope of the working portion of the flange of an unworn wheel for a comprehensively retrofitted bogie of the freight car on wear of its wheels. Meth-od...
Numerical analysis of stresses of bone and implant system of hip joint acetabulum
Hip replacement has need for an analysis of biomechanics of components of a prosthetic implant after a surgical procedure. Studies of the behavior of the bone-implant system with methods of a mathematical analysis are ur...
Effects of intermediate thermo-mechanical treatment in creep on strength characteristics and microstructure of AMg6M alloy
The effects of the intermediate thermomechanical treatment in creep on the strength characteristics and the microstructure of the AMg6M aluminium-magnesium alloy were studied. Mechanical tests were carried out at 160ºC a...