Theoretical study of temperature regimes when flowing-around axisymmetric bodies being transported on the aircraft external suspension

DOI: 10.34759/trd-2020-111-4

Аuthors

Maskaykin V. A.

e-mail: vladimir.maskaykin@mail.ru

Abstract

The presented article considers the temperature regimes while flowing-round the transported axisymmetric bodies, which internal temperature is limited. Conditions at which axisymmetric bodies’ transportation happens are represented by the negative ambient temperature and air medium disturbances. The necessity for minimizing the impact of the external ambient effect on the state of the object being transported arises while this problem analysis. The air medium disturbance impact on the object is assumed being in horizontal plane. The set problem was being solved by modelling the solid body flow-around in gaseous medium, including non-stationary heat transfer, employing finite element method. The problem of external ambient static temperature impact was considered to evaluate external factors effect on the axisymmetric body transportation conditions. This problem was solved by modeling non-stationary heat transfer using the finite-difference method. Materials applied in aviation engineering were selected as an axisymmetric body material.

The results of the study demonstrate that cooling time of the axisymmetric body without air ambient disturbance passes faster. It can be assumed that with increasing of the air flow rate, acting on the solid body (excluding the airflow drag effect at a nose portion), its cooling time will be less. Axisymmetric body materials with poor thermal insulation properties compensate rapid body cooling by heat transfer with the external environment (if we consider the temperature regime with air ambient disturbance), in contrast to the axisymmetric body of material with high thermal insulation properties.

Keywords:

non-stationary thermal conductivity, air disturbance of the environment, transportation, aircraft external suspension, axisymmetric body

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