Analysis of cooling of the exhaust system in a small airplane by applying the ejector effect
Abstract
This paper presents a thermal analysis of elements of the exhaust system of the redesigned airplane I-23. In order to improvethe thermal performance of the exhaust system and decrease thermal loads inside the engine bay, modifications of the initialgeometry of the cover pipe were proposed. This pipe shields the nacelle interior from thermal interaction and direct contactwith the hot exhaust pipe. Several openings were created in its wall to increase the mass flow rate of the cold air sucked infrom the nacelle interior to the gap between the exhaust pipe and its cover due to the ejector effect. Then numerical modelswere developed and simulations for flight conditions were carried out for the original and modified exhaust systems. Theresults obtained for both geometries were compared, showing that openings in the cover duct resulted in a high mass flowrate flowing through the gap between exhaust pipe and its cover and a lower exhaust pipe temperature. Even though thenumber, locations and cross-section area of the openings were selected arbitrarily, better thermal performance was obtainedfor the modified exhaust system.References
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Simplified thermo-fluid model of an engine cowling in a small airplane,
Aircraft Engineering and Aerospace Technology: An International
Journal 86 (3) (2014) 242–249.
[2] W. Stalewski, J. ˙ Zółtak, The preliminary design of the air-intake system
and the nacelle in the small aircraft-engine integration process, Aircraft
Engineering and Aerospace Technology: An International Journal
86 (3) (2014) 250–258.
[3] T. Goetzendorf-Grabowski, Formulation of the optimization problem for
engine mount design–tractor propeller case, Aircraft Engineering and
Aerospace Technology: An International Journal 86 (3) (2014) 228–
233.
[4] P. Łapka, M. Bakker, P. Furma´ nski, H. van Tongeren, Comparison of
1d and 3d thermal models of the nacelle ventilation system in a small
airplane, Aircraft Engineering and Aerospace Technology 90 (1) (2018)
114–125.
[5] P. Łapka, M. Seredynski, P. Furmanski, Investigation of thermal interactions
between the exhaust jet and airplane skin in small aircrafts,
Progress in Computational Fluid Dynamics 2017, in print. 90 (1) (2017)
114–125.
[6] A. Iwaniuk, W. Wi´sniowski, J. ˙ Zółtak, Multi-disciplinary optimisation approach
for a light turboprop aircraft-engine integration and improvement,
Aircraft Engineering and Aerospace Technology: An International
Journal 88 (2) (2016) 348–355.
[7] J. Polewka, P. Krawczyk, P. Prusi ´ nski, Cfd modelling of low-emission
pulverized coal swirl burner, Journal of Power Technologies 96.
[8] W. Smuga, L. J. Kapusta, A. Teodorczyk, Numerical simulations of nheptane
spray in high pressure and temperature environments, Journal
of Power Technologies 97 (1) (2017) 1.
[9] M. Chmielewski, M. Gieras, Planck mean absorption coecients of h2o,
co2, co and no for radiation numerical modeling in combusting flows,
Journal of Power Technologies 95 (2) (2015) 97.
[10] H. K. Versteeg, W. Malalasekera, An introduction to computational fluid
dynamics: the finite volume method, Pearson Education, 2007.
[11] J. R. Howell, R. Siegel, M. Menguc, Thermal radiation heat transfer,
CRC press, 1992.
[12] P. Łapka, P. Furma´ nski, Fixed grid simulation of radiation-conduction
dominated solidification process, Journal of Heat Transfer 132 (2)
(2010) 023504.
[13] P. Łapka, P. Furma´ nski, Fixed cartesian grid based numerical model
for solidification process of semi-transparent materials i: modelling and
verification, International Journal of Heat and Mass Transfer 55 (19-20)
(2012) 4941–4952.
[14] International Standard Atmosphere Model
http://www.aerospaceweb.org/design/scripts/atmosphere/, 2017.
Published
2018-05-04
How to Cite
ZŁOTY, Łukasz; ŁAPKA, Piotr; FURMAŃSKI, Piotr.
Analysis of cooling of the exhaust system in a small airplane by applying the ejector effect.
Journal of Power Technologies, [S.l.], v. 98, n. 1, p. 121–126, may 2018.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1043>. Date accessed: 19 apr. 2024.
Issue
Section
Thermodynamics
Keywords
exhust system, heat transfer, numerical simulation, thermal model
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