Investigation of the influence of engine displacement along the aircraft wing on the propagation of a condensation trail

With the publication of this article, the authors continue their research into the interaction of vortex and condensation trails behind aircraft, which has begun in the previously published articles in the Civil Aviation High Technologies of the Moscow State Technical University of Civil Aviation. This paper presents the investigation results of the influence of engine displacement along the A320 aircraft wing on the development and propagation of a contrail. It should be clear that a contrail is a product of aviation fuel combustion in the engine and represents condensed moisture in the form of ice crystals, which is formed under certain conditions of the atmosphere. As numerous studies and observations have shown, contrails can affect the heat exchange processes in the atmosphere and deteriorate the environment contributing to the greenhouse effect. This is especially true for the areas where numerous airways pass. It was noted that inboard engine displacement or, vice versa, outboard affects the development and propagation of a contrail. Therefore, when forming the aerodynamic configuration of the future aircraft, designers should take this aspect into account. The fact is that a wake vortex, which is formed behind the aircraft, impacts the contrail in different ways, depending on the engine proximity to the vortices, trailing from the airframe. Let us point out that a wake vortex is the area of the disturbed airflow behind the aircraft, generated as a result of its movement. A contrail, interacting with a vortex one, dissipates in the atmosphere, and the substances, composing a contrail, lose their concentration. It is also significant that a contrail, interacting with a wake vortex, can reveal its structure and visualize the wake vortex propagation and decay processes. In this paper, a special computational software application, based on the discrete vortex method, was used to study the influence of engine displacement along the A320 aircraft wing on the development and propagation of a contrail. When calculating the characteristics of a wake vortex, it takes into consideration the aircraft weight, speed and altitude, flight configuration, ambient conditions, axial velocity in the vortex core and some other factors. This complex passed the required testing and the state registration. A variety of activities was undertaken to validate and verify the developed complex, confirming the operability of its programs and the reliability of the results obtained. The results obtained allow us to understand how engine displacement along the A320 aircraft wing influences the contrail development and propagation.

1. Zhelannikov, A.I., Zamyatin, A.N. & Chinyuchin, Yu.M. (2022). Influence of the state of the atmosphere on the interaction of vortex and condensation traces of aircraft. Civil Aviation High Technologies, vol. 25, no. 2, pp. 70–79. DOI:10.26467/2079-0619-2022-25-2-70-80

2. Grigorev, M.A., Zamyatin, A.N. & Rogozin, V. (2016). Airflow visualization during research of large scale vortex flows. ICAS 2016, 30th Congress of the International Council of the Aeronautical Science in Daejeon, Korea, pp. 1–7.

3. Ginevsky, A.S. & Zhelannikov, A.I. (2009). Vortex wakes of aircrafts. Springer-Verlag Berlin, Heidelberg, 154 p. DOI:10.1007/978-3-642-01760-5

4. Winckelmans, G., Cottin, C., Daeninck, G. & Leweke, T. (2007). Experimental and numerical study of counter-rotating vortex pair dynamics in ground defect. 18th Congress Français de Mécanique, pp. 28–33.

5. Winckelmans, G., Bricteux, L., Cocle, R., Duponcheel, M. & Georges, L. (2007). Assessment of multiscale models for LES: spectral behavior in very high Reynolds number turbulence and cases with aircraft wakes vortices. Proceedings 5th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-5), Garching, Germany, vol. 1, pp. 327–331.

6. Frech, M. & Holzapfel, F. (2008). Skill of an aircraft wake-vortex model using weather prediction and observation. Journal of Aircraft, vol. 45, no. 2, pp. 461–470. DOI:10.2514/1.28983

7. Holzapfel, F. & Steen, M. (2007). Aircraft wake-vortex evolution in ground proximity: analysis and parameterization. AIAA J, vol. 45, no. 1, pp. 218–227. DOI:10.2514/1.23917

8. Stephan, A., Rohlmann, D., Holzäpfel, F. & Rudnik, R. (2019). Effects of detailed geometry on aircraft wake vortex dynamics during landing. Journal of Aircraft, vol. 56, no. 3, pp. 974–989. DOI:10.2514/1.C034961

9. Barnes, C.J., Visbal, M.R. & Huang, P.G. (2016). On the effects of vertical offset and core structure in stream wise oriented vortex-wing interactions. Journal of Fluid Mechanics, vol. 799, pp. 128–158. DOI:10.1017/jfm.2016.320

10. McKenna, C., Bross, M. & Rockwell, D. (2017). Structure of a stream wise oriented vortex incident upon a wing. Journal of Fluid Mechanics, vol. 816, pp. 306–330. DOI:10.1017/jfm.2017.87

11. Unterstrasser, S. & Stephan, A. (2021). Far field wake vortex evolution of two aircraft formation flight and implications on young contrails. The Aeronautical Journal, vol. 124, issue 1275, pp. 667–702. DOI:10.1017/aer.2020.3

12. Stephan, A., Schrall, J. & Holzäpfel, F. (2017). Numerical optimization of plate-line design for enhanced wake-vortex decay. Journal Aircraft, vol. 54, no. 3, pp. 995–1010. DOI:10.2514/1.C033973

13. Zhelannikov, A.I. & Zamyatin, A.N. (2015). Design-a software package for the system of vortex-Reva security. Patent RU no. 2015614783, publ. April 28.

14. Belotserkovsky, S.M. & Nisht, M.I. (1978). [Separation and non-separation flow of thin wings with an ideal liquid]. Moscow: Nauka, 277 p. (in Russian)

15. Vyshinsky, V.V. & Sudakov, G.G. (2006). [Vortex trace of an airplane in a turbulent atmosphere]. Trudy TsAGI, issue 2667, 155 p. (in Russian)

16. Vyshinsky, V.V. & Sudakov, G.G. (2009). [The vortex track of the aircraft and flight safety issues]. Proceedings of Moscow Institute of Physics and Technology, vol. 1, no. 3, pp. 73–93. (in Russian)

17. Animitsa, O.V., Gaifullin, A.M., Ryzhov, A.A. & Sviridenko, Yu.N. (2015). [Modeling of refueling an airplane in flight on the pilot stand]. Proceedings of Moscow Institute of Physics and Technology, vol. 7, no. 1, pp. 3–15. (in Russian)

18. Bosnyakov, I.S. & Sudakov, G.G. (2013). [Modeling the destruction of a vortex wake behind a passenger plane using computational aerodynamics methods]. Trudy TsAGI, issue 2730, pp. 3–12. (in Russian)

19. Aparinov, V.A. & Dvorak, A.V. (1986). [The method of discrete vortices with closed vortex frames]. Trudy VVIA im. Prof. N.Ye. Zhukovskogo, issue 1313, pp. 424–432. (in Russian)

20. Belotserkovsky, S.M. & Ginevsky, A.S. (1995). [Modeling of turbulent jets and traces based on the discrete vortex method]. Moscow: Fizmatlit, 1995. 368 p. (in Russian)