Journal of Aeronautical Engineering

Journal of Aeronautical Engineering

Numerical investigation of thermal and fluid analysis of the effect of flight altitude and porous metal foam on the oil cooler of training airplane

Document Type : Original Article

Authors
mohamad sedighi 1
ahmadreza ayoobi 2
Ehsan Aminian 3
1 Department of aerosapce.Aerospace faculty.shahid sattari aeronautical university.Tehran.Iran
2 Department of aerospace. Aerospace faculty. shahid Sattari aeronautical University. Tehran. Iran
3 school of mechanical engineering,iran university of science and technology.Tehran,Iran
10.22034/joae.2023.348694.1105
Abstract
using porous metal foams is one of the conventional methods to increase heat transfer in industrial systems, including heat exchangers. Porous media increase heat transfer and lead to an increase in pressure drop.. In this paper, the three-dimensional effects of flight altitude (1000m<H<5000m) and porous metal foam with Darcy number(0.1<Da<0.0001) in a training airplane oil cooler were investigated. The porosity coefficient was assumed to be 0.9 for all cases with porous foam.The Darcy-Brinkman-Fortheim equation was used to simulate a 20 W50 oil flow in a porous medium. The thermophysical properties of the oil including density, viscosity and thermal conductivity were extracted using laboratory data in terms of operating temperature. Hot oil with boundary condition enters the oil cooler. The boundary condition of the output oil is . The cooling wall is the boundary condition of non-slip and the heat transfer coefficient of air movement is proportional to the height. The governing equations are discrete based on the finite volume method using commercial computational fluid dynamics FLUENT. With increasing flight altitude, in pure oil mode, heat transfer, pressure drop and performance evaluation criteria increase by 0.65%, 0.45% and 0.49%, respectively. Porous metal foam with Darcy number having leads to increase of Nusselt number , increase of pressure drop and has the highest performance evaluation criterion PEC=31.75. Porous metal foam with Darcy number has the highest pressure drop and the highest heat transfer increase . According to the obtained results, Darcy's number is the most optimal performance evaluation parameter.
Keywords
Porous metal foam
Computational fluid dynamics
Bonanza plane
Flight altitude
Oil cooling

Subjects

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Journal of Aeronautical Engineering
Volume 25, Issue 2
September 2023
Pages 12-20

  • Receive Date 23 June 2022
  • Revise Date 04 December 2022
  • Accept Date 30 September 2023