Analysis of cooling of the exhaust system in a small airplane by applying the ejector effect

Łukasz Złoty, Piotr Łapka, Piotr Furmański

Abstract


This paper presents a thermal analysis of elements of the exhaust system of the redesigned airplane I-23. In order to improve
the thermal performance of the exhaust system and decrease thermal loads inside the engine bay, modifications of the initial
geometry of the cover pipe were proposed. This pipe shields the nacelle interior from thermal interaction and direct contact
with the hot exhaust pipe. Several openings were created in its wall to increase the mass flow rate of the cold air sucked in
from the nacelle interior to the gap between the exhaust pipe and its cover due to the ejector effect. Then numerical models
were developed and simulations for flight conditions were carried out for the original and modified exhaust systems. The
results obtained for both geometries were compared, showing that openings in the cover duct resulted in a high mass flow
rate flowing through the gap between exhaust pipe and its cover and a lower exhaust pipe temperature. Even though the
number, locations and cross-section area of the openings were selected arbitrarily, better thermal performance was obtained
for the modified exhaust system.


Keywords


exhust system, heat transfer, numerical simulation, thermal model

Full Text:

PDF

References


P. Łapka, M. Seredy´ nski, P. Furma´ nski, A. Dziubi´ nski, J. Banaszek,

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.

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

(3) (2014) 250–258.

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–

P. Łapka, M. Bakker, P. Furma´ nski, H. van Tongeren, Comparison of

d and 3d thermal models of the nacelle ventilation system in a small

airplane, Aircraft Engineering and Aerospace Technology 90 (1) (2018)

–125.

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)

–125.

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.

J. Polewka, P. Krawczyk, P. Prusi ´ nski, Cfd modelling of low-emission

pulverized coal swirl burner, Journal of Power Technologies 96.

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.

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.

H. K. Versteeg, W. Malalasekera, An introduction to computational fluid

dynamics: the finite volume method, Pearson Education, 2007.

J. R. Howell, R. Siegel, M. Menguc, Thermal radiation heat transfer,

CRC press, 1992.

P. Łapka, P. Furma´ nski, Fixed grid simulation of radiation-conduction

dominated solidification process, Journal of Heat Transfer 132 (2)

(2010) 023504.

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.

International Standard Atmosphere Model

http://www.aerospaceweb.org/design/scripts/atmosphere/, 2017.


Refbacks

  • There are currently no refbacks.