Nozzles of Jet Engines

Pirumov, U. G.; Roslyakov, G. S.

doi:10.1007/978-3-642-86790-3_5

Cited by 4 publications

(7 citation statements)

References 12 publications

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“…It is known [24][25][26][27][28] that a decrease in the degree of non-design n below a certain value n cr leads to the irregular reflection of the incident shock from the jet axis with the formation of a Y-shaped system of shocks, consisting of two oblique and one direct shocks. Spatial distributions of the Mach number, pressure and longitudinal velocity in combustion products and wake air corresponding to the first point of the ARIAN 5 flight trajectory (flight altitude 6 km), which are presented in Figures 6 and 7, illustrate this fact.…”

Section: Some Results Of Calculations Of Gas-dynamic Parameters Of a ...mentioning

confidence: 99%

The Adaptive Composite Block-Structured Grid Calculation of the Gas-Dynamic Characteristics of an Aircraft Moving in a Gas Environment

2022

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This paper considers the problem associated with the numerical simulation of the interaction between the cocurrent stream occurring near a monoblock moving in the gas medium and solid fuel combustion products flowing from a solid fuel rocket engine (SFRE). The peculiarity of the approach used is the description of gas-dynamic processes inside the combustion chamber, in the nozzle block, and the down jet based on a single calculation methodology. In the formulated numerical methodology, the calculation of gas-dynamic parameters is based on the solution of unsteady Navier–Stokes equations and the application of a hybrid computational grid. A hybrid block-structured computational grid makes it possible to calculate gas flow near bodies of complex geometric shapes. The simulation of the main phase of interaction, corresponding to the stationary mode of rocket flight in the Earth’s atmosphere, has been carried out. A conjugated simulation of the internal ballistics of SFRE and interaction of combustion products jets is conducted.

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Section: Some Results Of Calculations Of Gas-dynamic Parameters Of a ...mentioning

confidence: 99%

The Adaptive Composite Block-Structured Grid Calculation of the Gas-Dynamic Characteristics of an Aircraft Moving in a Gas Environment

2022

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“…The model is based on the equations of mass, momentum, and energy transfer, written in differential form within the regions of the solution smoothness, and in integral form, namely in the form of dynamic and kinematic compatibility conditions, at the areas of strong and weak discontinuities. The corresponding hyperbolic system of quasilinear differential equations in partial derivatives in the regions of flow continuity can be stated in the characteristic form, as follows [6,9]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…When passing through a shock wave (SW) and a contact discontinuity (CD), the following Rankine-Hugoniot relations are followed [9,10]:…”

Section: Mathematical Modelmentioning

confidence: 99%

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Grid-Characteristic Method for Calculation of Discontinuous Non-Steady Flows of a Multicomponent Reacting Gas in Channels

Gidaspov,

Severina

2023

Fluids

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This paper is devoted to the description of computational algorithms for modeling quasi-one-dimensional non-steady flows of a multicomponent reacting gas. The particularity of the developed modeling technique is that the paths of strong and weak discontinuities are mobile computational nodes, and the parameters for them are calculated using special algorithms. A set of programs has been developed, which can be used to solve the problems of the reacting gas dynamics that are of applied importance, as well as serve as an illustrator for physical gas dynamics training courses. The paper provides the results of the numerical modeling of the supersonic flow in a flat channel simulating the operation of experimental facilities of the Institute for Problems in Mechanics and the Institute of Physics and Technology. A satisfactory correlation between the calculated and experimental data has been obtained.

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“…Experimental data on CO rotational relaxation at low temperature (T<80 K) have been derived from measurements in supersonic expansions, 26,27,29,33,34 mostly free jets, that are specially suited for the generation of very cold gas phases. The determination of relaxation rate coefficients or cross sections from the analysis of the free jet data requires a description of the supersonic flow, which can, in principle, be obtained from the solution of the hydrodynamic equations, 59 although in practice this is not always feasible. In some cases, a detailed experimental characterization of free jet flow fields is also becoming possible thanks to recent experimental progress.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Rotational Relaxation of CO in Self-Collisions and in Collisions with Ne and He

et al. 2005

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The low-temperature rotational relaxation of CO in self-collisions and in collisions with the rare-gas atoms Ne and He has been investigated in supersonic expansions with a combination of resonance-enhanced multiphoton ionization (REMPI) spectroscopy and time-of-flight techniques. For the REMPI detection of CO, a novel 2 + 1' scheme has been employed through the A(1)Pi state of CO. From the measured data, average cross sections for rotational relaxation have been derived as a function of temperature in the range 5-100 K. For CO-Ne and CO-He, the relaxation cross sections grow, respectively, from values of approximately 20 and 7 A(2) at 100 K to values of approximately 65-70 and approximately 20 A(2) in the 5-20 K temperature range. The cross section for the relaxation of CO-CO grows from a value close to 40 A(2) at 100 K to a maximum of 60 A(2) at 20 K and then decreases again to 40 A(2) at 5 K. These results are qualitatively similar to those obtained previously with the same technique for N(2)-N(2), N(2)-Ne, and N(2)-He collisions, although in the low-temperature range (T < 20 K) the CO relaxation cross sections are significantly larger than those for N(2). Some discrepancies have been found between the present relaxation cross sections for CO-CO and CO-He and the values derived from electron-induced fluorescence experiments.

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Nozzles of Jet Engines

Cited by 4 publications

References 12 publications

The Adaptive Composite Block-Structured Grid Calculation of the Gas-Dynamic Characteristics of an Aircraft Moving in a Gas Environment

The Adaptive Composite Block-Structured Grid Calculation of the Gas-Dynamic Characteristics of an Aircraft Moving in a Gas Environment

Grid-Characteristic Method for Calculation of Discontinuous Non-Steady Flows of a Multicomponent Reacting Gas in Channels

Low-Temperature Rotational Relaxation of CO in Self-Collisions and in Collisions with Ne and He

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