Analysis of the effect of turbulent viscosity models on the calculation of rocket engine combustion product jet flows
Journal Title: Технічна механіка, Техническая механика, Technical Mechanics - Year 2018, Vol 4, Issue 4
Abstract
This paper reports the results of calculations of turbulent gas jet flows with the use of an algebraic turbu-lence model ( Safronov’s model) and two one-parameter differential turbulence models (Sekundov’s model and the Nut-90 model). The aim of this paper is to choose the model most appropriate for jet engine combustion prod-uct flow calculation out of the three above-mentioned models. A turbulent flow in a supersonic jet is calculated by solving the “viscous layer” equations by application of an implicit marching method along the jet axis. The turbulence model is chosen by comparing the calculated data with experimental data reported in the literature. Using this choice criterion, the algebraic turbulence model and the Nut-90 one-parameter differential turbulence model were chosen for the calculation of turbulent jet engine flows. Sekundov’s turbulent model overestimates turbulent mixing in comparison with the experimental data; because of this, that model was excluded from the subsequent analysis. Using the two chosen turbulence models, flows in combustion product jets were calculated for two jet engines differing both in the exit nozzle dimensions and in the combustion product composition. From the results of the study of flows in combustion product jets it may be concluded that none of the three turbulence models considered cannot be used as a universal model in the calculation of jet engine combustion product flows. The appropriate turbulence model can only be chosen based on experimental data.
Authors and Affiliations
V. Halynskyi
Keywords
Related Articles
- EP ID EP466797
- DOI -
- Views 99
- Downloads 0
Evaluation of vehicle motion for electrodynamic transport system with plane track on side track of turn-out
The research aim is to provide the possibility of the vehicle motion of an electric dynamic transportation system on the turnout of a plane track, using mathematical modelling. The research novelty is to estimate a safe...
Motion sensing by a two-probe implementation of microwave interferometry
This paper addresses the possibility of displacement measurement by microwave interferometry at an unknown reflection coefficient with the use of two probes mounted in a waveguide section. The aim of this paper is to sho...
Dynamic instability of stiffened conic fairings for launch vehicles in supersonic gas flow
Vibrations of launch vehicle conical fairings stiffened by rings in the gas flow are investigated. Fairings are simulated using thin conic shells stiffened by inner rings. Losses in a dynamic structural stability corresp...
Development of a combined technology for parts strengthening
The aim of this work is to develop a combined technological process for improving the performance characteristics of units and parts with moving contacting surfaces. The process is based on metal surface property modific...
Rational selection of parameters of dynamic damper of longitudinal vibrations of liquid launch vehicle
A significant increase in amplitudes of elastic longitudinal vibrations of a launch vehicle (LV) occurring in losses in longitudinal stability of liquid LVs may be responsible for an emergency. Measures for providing lon...