Specificities of landing propulsion system jets’ gas dynamic effects on re-entry vehicle and ground surface during landing

2021 ◽  
pp. 5-13
Author(s):  
Aleksandr O. PAVLOV ◽  
Tatyana V. Simakova
Keyword(s):  
Numerical Simulation ◽  
Gas Dynamics ◽  
Ground Surface ◽  
Combustion Products ◽  
Propulsion System ◽  
Dynamic Effects ◽  
Pressure Distributions ◽  
Gas Dynamic ◽  
Propulsion Unit ◽  
New Generation

The re-entry vehicle that is part of the new generation piloted spacecraft being developed in RSC “Energia” is designed to land on ground with the help of parachute-reactive landing system. One of the parts of this system is the propulsion unit that helps reduce the descend velocity just before touchdown. Knowledge of gas dynamics of jets formed by combustion products of working propulsion unit is essential for designing its regime. This paper contains results of numerical simulation of the landing process of re-entry vehicle with active propulsion unit near the ground. Among the acquired data are pressure distributions over the landing area and over the surface of the re-entry vehicle. Obtained results are necessary for determining optimal configuration and regime of the propulsion unit. Key words: landing propulsion system, re-entry vehicle, jet gas dynamics.

scholarly journals Numerical simulation of gas dynamic and physical-chemical processes in hypersonic flows past bodies

2017 ◽  
pp. 387-405
Author(s):  
К.Н. Волков ◽  
В.Н. Емельянов ◽  
А.Г. Карпенко
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Finite Difference ◽  
Gas Dynamics ◽  
Hypersonic Flows ◽  
Chemical Processes ◽  
Difference Schemes ◽  
Finite Difference Schemes ◽  
Gas Dynamic ◽  
Physical Chemical

Рассматриваются вопросы, связанные с численным моделированием газодинамических и физико-химических процессов, сопровождающих гиперзвуковое обтекание тел различной формы. Математическая модель включает в себя уравнения газовой динамики, записанные для реального газа, и уравнения химической кинетики, описывающие равновесные процессы в высокотемпературном воздухе. Для дискретизации основных расчетных соотношений применяется метод конечных объемов и различные разностные схемы для дискретизации конвективных потоков. Возможности разработанной вычислительной процедуры показываются на примере решения ряда задач физико-химической газовой динамики. Расчеты проводятся с использованием графических процессоров общего назначения. Обсуждается время счета, достигнутое при использовании различных разностных схем и подходов к описанию свойств высокотемпературного воздуха. Numerical simulation of gas dynamic and physical-chemical processes in hypersonic flows past bodies of various shapes is considered. The mathematical model includes the gas dynamics equations of real gases and the equations of chemical kinetics describing equilibrium processes in high-temperature air. The finite volume method and various finite difference schemes for the discretization of convective fluxes are used to discretize the governing equations. The capabilities of the numerical procedure are demonstrated by the solution of a number of problems in physical-chemical gas dynamics. The calculations are performed using general-purpose graphics processor units. The computational time achieved with the use of various finite difference schemes and the approaches to describe the properties of high-temperature air are discussed.

scholarly journals Design Method for Channel Diffusers of Centrifugal Compressors

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Mykola Kalinkevych ◽  
Andriy Skoryk
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Inverse Problem ◽  
High Pressure ◽  
Gas Dynamics ◽  
Design Method ◽  
Compressor Stage ◽  
Centrifugal Compressors ◽  
Vaned Diffuser ◽  
Gas Dynamic

The design method for channel diffusers of centrifugal compressors, which is based on the solving of the inverse problem of gas dynamics, is presented in the paper. The concept of the design is to provide high pressure recovery of the diffuser by assuming the preseparation condition of the boundary layer along one of the channel surfaces. The channel diffuser was designed with the use of developed method to replace the vaned diffuser of the centrifugal compressor model stage. The numerical simulation of the diffusers was implemented by means of CFD software. Obtained gas dynamic characteristics of the designed diffuser were compared to the base vaned diffuser of the compressor stage.

scholarly journals Numerical simulation of the interaction between combustion products of a cartridge pressure accumulator and oxygen in the launch container

2019 ◽  
pp. 68-73
Author(s):  
R. A. Peshkov ◽  
D. R. Ismagilov
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Combustion Products ◽  
Computational Domain ◽  
Two Dimensional ◽  
Dynamic Parameters ◽  
Gas Dynamic ◽  
Three Dimensional Models ◽  
Main Components ◽  
Research Show

The paper introduces a mathematical model for calculating the gas-dynamic parameters in the launch container. The model takes into account chemical interactions between the main components of the combustion products, i.e. carbon monoxide and hydrogen, and oxygen. The resulting energy can be used to increase the initiating pulse of the rocket. Within the research, we described the basic requirements for the grid model, and analyzed the accuracy of the results obtained. Furthermore, we compared calculation data of pressure in the launch container with the results of the known method. Findings of research show that the use of two-dimensional and three-dimensional models makes it possible to obtain not only medium-volume gas-dynamic parameters, such as pressure, temperature, density, but also the distribution of these parameters over the computational domain. The developed method of numerical simulation will allow us to estimate the effect of changes in the configuration of the sub-rocket volume and other parameters on the dynamics of the rocket movement without conducting an expensive experiment

Masers as probes of the gas dynamics close to forming high-mass stars

2017 ◽  
Vol 13 (S336) ◽  
pp. 201-206 ◽  
Author(s):  
Luca Moscadelli ◽  
Alberto Sanna ◽  
Ciriaco Goddi
Keyword(s):  
Gas Dynamics ◽  
Very Long Baseline Interferometry ◽  
High Mass ◽  
Powerful Technique ◽  
Long Baseline ◽  
Vlbi Observations ◽  
Massive Forming ◽  
Typical Distances ◽  
New Generation ◽  
Better Than

AbstractImaging the inner few 1000 AU around massive forming stars, at typical distances of several kpc, requires angular resolutions of better than 0″.1. Very Long Baseline Interferometry (VLBI) observations of interstellar molecular masers probe scales as small as a few AU, whereas (new-generation) centimeter and millimeter interferometers allow us to map scales of the order of a few 100 AU. Combining these informations all together, it presently provides the most powerful technique to trace the complex gas motions in the proto-stellar environment. In this work, we review a few compelling examples of this technique and summarize our findings.

scholarly journals Numerical Simulation of Intrachamber Processes in the Power Plant

2021 ◽  
Vol 11 (11) ◽  
pp. 4990
Author(s):  
Boris Benderskiy ◽  
Peter Frankovský ◽  
Alena Chernova
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Flow Structure ◽  
Power Plants ◽  
Control Volume ◽  
Conjugate Problem ◽  
Topological Features ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

Improvement of the Operating Processes in Boiler Furnaces of TÉTs-21 with the Help of Numerical Simulation of Thermal Gas Dynamic Processes

2003 ◽  
Vol 37 (5) ◽  
pp. 297-301
Author(s):  
A. P. Tishin ◽  
I. T. Goryunov ◽  
Yu. L. Gus'kov ◽  
D. A. Barshak ◽  
G. V. Presnov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Dynamic Processes ◽  
Gas Dynamic
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