Hydrodynamic Model of Cavitation Oscillation for Modelling Dynamic Processes Within Pump Systems at High Cavitation Number
Journal Title: Технічна механіка, Техническая механика, Technical Mechanics - Year 2017, Vol 2, Issue 2
Abstract
The paper deals with mathematical modelling the low-frequency dynamic processes within liquid rocket engines (LRE). Attention in the work is devoted to developing the mathematical model of the cavitation oscillation for modelling the dynamic processes within the pump systems at the high cavitation number. To attain this objective, the experimental and calculated dependences of the cavities elasticity on the pump parameters at the high cavitation number are corrected including the cavitation number resulting in cavities within the centrifugalimpeller pump. The dependence of the cavities volume on the operating conditions of the pump is determined using the experimental and calculated method of the measurement of the elasticity and the cavities volume within the centrifugal-impeller pumps. The dynamic cavity equation is derived in the differential form. In the calculations of LRE starting, it allows to use the derived analytical dependences for a nonlinear hydrodynamic model and to take into account the fluid compliance (under cavitation-free conditions of the pump operation) within the supply line without changing the structure of the mathematical model of the LRE starting and discontinuous changing the values of the equation coefficients. The research results can be used to take into account the cavitation effects within the pumps for calculating LRE starting
Authors and Affiliations
S. Dolgopolov
Keywords
Related Articles
- EP ID EP342485
- DOI -
- Views 106
- Downloads 0
. On the aerodynamic optimization of impellers of supersonic compressor stages.
The study deals with the pressing problem of diminution in the computer time for an aerodynamic optimization of blade rims of axial compressors when a numerical simulation of the flow based on the full averaged Navier-St...
Bifunctional system of thrust-vector control of liquid rocket engine with turbine gas injection into nozzle
The results of the study of a bifunctional thrust- vector control system of a liquid rocket engine based on the combined use of the mechanical (engine swinging) and gas-dynamic (the gas turbine injection into the nozzle)...
Analysis of ways and models of deployment of space tethered systems
Space tethered systems consisting of satellites conducting with flexible wires (tethers) can form the basis for advanced facilities for removing space debris from near-earth orbit. This raises the question of the deploym...
Оutstanding scientist in mechanics Viktor Vassilievich Pylypenko
This paper is dedicated to the memory of Academician of the NAS of Ukraine Viktor V. Pylypenko
Features of mathematical simulation of gas path dynamics in the problem of the stability of low-frequency processes in liquid-propellant rocket engines
One of the important problems in the designing of liquid-propellant rocket engines (LPREs) is the study of the stability of low-frequency processes in LPREs by mathematical simulation. In the low-frequency range, the dyn...