Experimental complex of supersonic wind tunnels for aerophysical tests

Аuthors

Abashev V. M.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

e-mail: abashevVM@mai.ru

Abstract

The article describes the “Experimental complex of supersonic wind tunnels for aero-physical tests”, which is operated in the MAI. It is intended for educational process, as well as research and development works. Both external and internal aerodynamic blowdowns are being performed with it. The complex includes two supersonic wind tunnels with interconnected systems: pneumatic system, exhaust vacuum system, as well asmeasuring and control systems. Aero-physical tests are being conducted for the models of a 30-300 mm diameter and a 0.35-1.5 m length. The duration of the experiment is 0.2-3.0 s. The airflow velocity is supersonic, ensuring the tests for modern operation conditions of atmospheric aircraft. The air consumption is up to 5.0-150.0 kg/s at the temperature up to 720-750 K.

The wind tunnels are of the same structural scheme and differ only in sizes. The principle of “sequential experiment” is being realized. Two series of aero-physical tests are being performed after preliminary numerical thermo- gas-dynamic study. At first, the required number of low-cost approximate tests on a small-size autonomous wind tunnel is conducted. The adjustment of equipment, rigging, various systems and measurements necessary for the main tube functioning is performed. Preliminary test results of the small-size model are being obtained. Further, a small number of full-size model tests are conducted in the main wind tunnel.

The tests specificity consists in their high economy and low cost due to the short time of the experiment and availability of the autonomous pressure systems.

The article describes the sensor, measuring static pressures of the supersonic flow in the inner duct of the experimental model. Small orifices serve as sensing elements, operating as stress concentrators. The stresses are being measured with polarizing-optical method of photoelasticity. Polarizing-optical installations intended for visualization and fixation of the principal stress difference bands pattern in the experimental model are presented. The stresses determining accuracy is 1-3%.

Static pressures are being determined by measured principal stress difference near the orifices.

Keywords:

experimental complex, supersonic wind tunnel, polarizing-optical installatioin, photoelasticity method, main stress difference band, photoelastic static pressure sensor, internal model duct

References

1. Kharitonov A.M. Tekhnika i metody aerofizicheskogo eksperimenta. Ch. 1 Aerodinamicheskie truby i gazodinamicheskie ustanovki (Technique and methods of aerophysical experiment. Part 1 Wind tunnels and gas-dynamic installations), Novosibirsk, NGTU, 2005, 217 p.

2. Zvegintsev V.I. Gazodinamicheskie ustanovki kratkovremennogo deistviya. Chast’ 1. Ustanovki dlya nauchnykh issledovanii (Gas-dynamic installations of short-time action. Part 1. Installations for scientific research), Novosibirsk, Parallel’, 2014, 550 p.

3. Kharitonov A.M. Tekhnika i metody aerofizicheskogo eksperimenta. Ch. 2 Metody i sredstva aerofizicheskikh izmerenii (Technique and methods of aero-physical experiment. Part 2 Methods and means of aero-physical measurements), Novosibirsk, NGTU, 2007, 456 p.

4. Petronevich V.V., Lyutov V.V., Manvelyan V.S. et al. Studies on six-component rotating strain-gauge balance calibration for aircraft propellers testing. Aerospace MAI Journal, 2021, vol. 28, no. 4, pp. 48-61. DOI: 10.34759/vst-2021-4-48-61

5. Lepeshinskii I.A. Gazodinamika odno- i dvukhfaznykh techenii v reaktivnykh dvigatelyakh (Gas dynamics of single- and two-phase flows in jet engines), Moscow, MAI, 2003, 276 p.

6. Petrunin A.N. Metody i tekhnika izmerenii gazovogo potoka. Priemniki davleniya i skorostnogo napora (Methods and techniques of gas flow measurements. Pressure and velocity pressure receivers), Moscow, Mashinostroenie, 1972, 332 p.

7. Petrunin A.V., Ponomarev L.F. Uchenye zapiski TsAGI, 1999, vol. XXX, no. 1-2, pp. 84–87.

8. Kiem L.K., Efimov I.P., Dyk M.S., Kuznetsov A.S. Issledovanie protochnykh priemnikov staticheskogo davleniya (The study of static pressure flow receivers), Ulyanovsk, UlGTU, 2022, 262 p.

9. Abashev V.M., Eremkin I.N., Zhivotov N.P. et al. Inzhenerno-fizicheskii zhurnal, 2018, vol. 91, no. 2, pp. 361-370.

10. Tupikin A.V., Tret’yakov P.K., Abashev V.M. Materialy XVII Vserossiiskogo seminara s mezhdunarodnym uchastiem “Dinamika mnogofaznykh sred” (27 August – 4 September 2021; Novosibirsk), Novosibirsk, ITPM SO RAN, 2021, p. 19.

11. Tretyakov P.K., Tupikin A.V., Abashev V.M. Modeling the effect of wave structures arising during the deformation of the channel wall on the supersonic flow with heat supply. Actual Problems of Continuum Mechanics: Experiment, Theory, and Applications (20-24 September 2023). vol. 2504. no.1: 030104. DOI: 10.1063/5.0132369

12. Khatuntseva O.N., Shuvalova A.M. On additional “multi- scale” similarity criteria for experimental work-out of aerospace engineering products. Aerospace MAI Journal, 2023, vol. 30, no. 1, pp. 91-97. DOI: 10.34759/vst-2023-1-91-97

13. Feodos’ev V.I. Soprotivlenie materialov (Resistance of materials), 16th ed. Moscow, MGTU im. N.E. Baumana, 2016, 543 p.

14. Mekheda V.A. Tenzometricheskii metod izmereniya deformatsii (Strain gauge method of strain measurement), Samara, SGAU, 2011, 54 p.

15. Abashev V.M. Osnovy metoda konechnykh elementov (Fundamentals of the finite element method), Moscow, MAI-Print, 2008, 82 p.

16. Frocht M.M. Photoelasticity. Vol. 1. Stresses and strains in two dimensions. Wiley and Sons, New York, 1941, 523 p.

17. Razumovskii I.A. Interferentsionno-opticheskie metody mekhaniki deformirovannogo tverdogo tela (Interference- optical methods of a deformed solid mechanics), Moscow, MGTU im. N.E. Baumana, 2007, 235 p.

18. Demidov A.S. Dvigatel’, 2018, no. 3(117), pp. 10–11.

19. Popov S.A., Pugachev Y. N. Wind tunnel Т-2 of MAI: history and perspectives. Aerospace MAI Journal, 2023, vol. 30, no. 1, pp. 9-22. DOI: 10.34759/vst-2023-1-9-22

20. Alyamovskii A.A., Sobachkin A.A., Odintsov E.V. et al. SolidWorks. Komp’yuternoe modelirovanie v inzhenernoi praktike (SolidWorks. Computer modeling in engineering practice), St. Petersburg, BHV- Petersburg, 2005, 800 p.

21. Abashev V.M. Materialy Mezhdunarodnoi shkoly–seminara “Modeli i metody aerodinamiki” (MMA-2023; 05–09 June 2023; Zhukovskii), Zhukovskii, TsAGI im. N.E. Zhukovskogo, 2023, pp. 5–6.

22. Alyamovskii A.A. SolidWorks/COSMOS Works. Inzhenernyi analiz metodom konechnykh elementov (SolidWorks/ COSMOSWorks. Engineering analysis by the finite element method), Moscow, DMK Press, 2004, 432 p.

23. Stepanov L.V., Dolgikh V.S. Vestnik Samarskogo gosudarstvennogo tekhnicheskogo universiteta. Seriya “Fiziko- matematicheskie nauki”, 2017, vol. 21, no. 4, pp. 717–735. DOI: 10.14498/vsgtu1544

24. Zhabbarov R.M. Vestnik Samarskogo universiteta. Estestvennonauchnaya seriya, 2019, vol. 25, no. 1, pp. 57–62. DOI: 10.18287/2541-7525-2019-25-1-57-62