Instantaneous Average Structure of a Supersonic Underexped Jet

Мұқаба

Дәйексөз келтіру

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Рұқсат жабық Тек жазылушылар үшін

Аннотация

The instantaneous and average structure of a supersonic underexpanded jet is studied numerically and experimentally. The photos obtained in experiments with different exposure times and the Pitot pressure measurements are compared with the results of the numerical modeling performed using an implicit large-eddy method. We note that the jet flow instability, disturbance growth, and transition to turbulence lead to the situation, in which the instantaneous flow structure can be considerably different from the average structure. The flow pattern observable in the calculations is in good agreement with that presented in the experimental photos obtained with short exposure times. Both calculated and experimental data indicate that an important role in the jet flow dynamics is played by large-scale vortex structures that exist against the background of small-scale turbulence. The calculated and experimental Pitot pressure distributions are similar with each other, up to a certain distance from the nozzle exit section. Further downstream, the experimental and calculated Pitot pressures start to increase rapidly but the calculations predict the onset of this growth at a greater distance from the nozzle than it is observable in the experiments.

Толық мәтін

Рұқсат жабық

Авторлар туралы

V. Zapryagaev

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: zapr@itam.nsc.ru
Ресей, Novosibirsk

I. Kavun

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: zapr@itam.nsc.ru
Ресей, Novosibirsk

N. Kiselev

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: zapr@itam.nsc.ru
Ресей, Novosibirsk

A. Kudryavtsev

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: alex@itam.nsc.ru
Ресей, Novosibirsk

A. Pivovarov

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: zapr@itam.nsc.ru
Ресей, Novosibirsk

D. Khotyanovsky

Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: khotyanovsky@itam.nsc.ru
Ресей, Novosibirsk

Әдебиет тізімі

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Жүктеу
2. Fig. 1. Schlieren photograph of supersonic jet expulsion from an axisymmetric convergent nozzle of 30 mm diameter at Npr = 5 with 10 ms exposure (a) and 3 µs exposure (b).

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3. Fig. 2. Photographs of the flow structure obtained by laser knife method with 10 ns exposure at two different moments of time (a, b) in the diametral plane of a supersonic jet flowing from an axisymmetric convergent nozzle of 60 mm diameter at Npr = 5.

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4. Fig. 3. Supersonic jet flow from an axisymmetric convergent nozzle with a diameter of 30 mm at Npr = 9: Schlieren photograph with a long exposure time (a) and a photograph obtained by the laser knife method (b).

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5. Fig. 4. Numerical schlieren visualisation in the y = 0 plane of an under-expanded jet, Npr = 5, flowing from a circular nozzle: full instantaneous flow pattern (a), instantaneous flow pattern near the nozzle (b), mean flow near the nozzle (c).

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6. Fig. 5. Distributions of Pitot pressure related to the pressure in the forechamber along the jet axis in the experiment (symbols) and in the calculation (solid curve) at Npr = 5.

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7. Fig. 6. Pitot pressure profiles in experiment (square symbols) and in calculation (solid curves) at Npr = 5 at cross sections x / D = 0.833 (a), 1.5 (b) and 3.5 (c).

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