Regularities of Physical Processes in Hybrid Solid-Propellant Rocket Engines

et al. 2016

Section: Introductionmentioning

confidence: 99%

Energy and Propulsion Optimization of Solid-Propellant Grain of a Hybrid Power Device

Бондарчук

Bondarchuk

et al. 2016

“…The real flow is may be accompanied by chemical transformations, the nature of which significantly complicates the mathematical description of the process. However, if the calculation of the equilibrium flow is not an end in itself, its design is in the of practical calculation method in most cases you can restrict a simple and technologically advanced approach "frozen" flow [1]. This approach assumes that the gas "constant" R and the heat capacity are determined by the mass concentration of additive components of the mixture.…”

mentioning

confidence: 99%

“…Often the calculation of stationary flow regimes often leads by the method establishing [1]. In this approach, the stationary solution is seen as the limit to which seeks unsteady solution for stationary conditions of flow and mass transfer area of the environment defined by the saturation level of the medium-pressure gas flow in the cavity of the device calculated.…”

mentioning

confidence: 99%

“…As for spatial calculations, the effect of the acceleration of finding the stationary solutions with this approach to the method of establishing observed, but was less noticeable. The existing experience of the author this paper and proposed approaches for solving various problems of gas dynamic [1,2,6] allows to offer them to build effective methods of numerical simulation of gas-dynamic parameters of real devices to significantly reduce the time spent on carrying out calculations.…”

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confidence: 99%

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Features Applications of the Approaches When Constructing Efficient Algorithms During the Modelling of Some Intracanal Flows

2016

Abstract. The methods of increasing the efficiency of the numerical solution of non-stationary problems of gas dynamics for a multicomponent mixture and acceleration the processes of detection of stationary solutions by the establishment method are discussed. Here is considered the relevant algorithms and are shown evaluations of increasing the effectiveness of numerical solutions.Despite the impressive progress in the capabilities of computer technology for many practical applications, there is not least for the important value of the effectiveness of the algorithms. They should reflect as accurately as possible the physical reality and to have the minimum for the one time step for calculate. In this case, these techniques can be widely used in the preliminary evaluation of selectable technical structures or techniques that require multivariate numerical studies. The same time, the economical use of a single calculation requires on-line tracking technology processes. This is especially true for different streams of high-energy working body of the flow path. The high gas velocity causes intensive heat exchange the working fluid of with different structural elements of power aggregate, which ultimately determines the basic parameters of the transient and stationary modes, and thermodynamic properties and viscosity of a multicomponent gas mixture for specifying dynamics of the process.The system of equations expressing the basic conservation laws are often written in the integral form that is independent of the coordinate system with respect to the control volume V, bounded by a closed surface, partially or wholly permeable to gas surface A and impermeable S, at which have the heat and mass transfer between gases flow and structural elements:

“…This the pressure behavior is explained due to on the one hand the strong diffusion properties of Lax's schemes, and on the other hand, the special features determining the pressure according to of the obtained values of density and internal energy [1]. Authors have the experience the use for determine of gas-dynamic parameters in difficult areas and in conditions of high gradients of pressure due to monotone SK Godunov scheme of decay of a discontinuity [3,4]. This method of determining the values of flows calculated on the channel border and at the borders of cells is well physically justified.…”

mentioning

confidence: 99%

Numerical Simulation of Methane Under Phase Transfer Conditions with its Real Properties

Бондарчук

Skryabinsky

et al. 2016

Abstract.The technique and results of calculation of parameters of the flow of methane in single and two-phase state is discussed. The flow is described by the one-dimensional nonstationary equations of a continuous medium. Is taken into account the processes of friction, heat transfer and phase transitions. The results of the application of various schemes of numerical integration of the equations are discussed.