Investigating the conjugate heat transfer phenomena on various ducts for aircraft environmental control system

Marimuthu, Karthigairajan; Umanath, K.; Krishnan, S. Suseel Jai

doi:10.1016/j.matpr.2021.01.651

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Its safety and reliability affect the function of the whole air management system. An unreliable air duct system can even pose potential safety hazards to other surrounding systems because the air ducts are distributed in multiple areas, such as the wing, engine suspension and fuselage [1][2][3][4][5]. Furthermore, the high temperature and pressure in the air ducts cause periodic mechanical stretching, compression and thermal fluctuations during the flight of the aircraft, and are liable to cause fracture and failure.…”

Section: Introductionmentioning

confidence: 99%

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

et al. 2022

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The aero ball joint is pivotal in aircraft duct systems due to its favorable properties, including displacement compensation and flexibility. In the stress assessment of air ducts, ball joints are usually simplified by using “Joints” connections to reduce the convergence problems caused by non-linearity, which requires a high degree of accuracy in the characteristic parameters of the ball joint. Accordingly, this paper builds a high temperature and pressure fatigue test platform to investigate the bending characteristics of the ball joint at different temperatures and pressures and points out the limitations of the current method. Then, a method combining finite element analysis (FEA) and the BP neural network is proposed to obtain the characteristic parameters of the ball joint. The results showed that the bending process of the ball joint tended to have two typically different stiffness properties, which were high rigidity and low rigidity. The bending characteristics were strongly influenced by pressure, but less influenced by temperature. The existing test platform increased the force reaction at the contact areas of the ball joint, resulting in errors in the measurement of characteristic parameters. The BP neural network prediction method could effectively alter the ball joint properties and reduce errors.

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Section: Introductionmentioning

confidence: 99%

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

et al. 2022

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“…In these methods, the mathematical model of each component and the variable transfer relationship between components are constructed, and the traditional numerical solution is used to solve these equations. CFD analysis is also used to study the aircraft air duct system, but the research object is the system model composed of a small number of pipes with simple geometric structures [15], or a single local pipe [16]. However, the air distribution system includes a large number of pipes, valves, joints, orifices, pressure sources, and local flow resistances.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Air Distribution System for a Passenger Aircraft Based on 1D and 3D Coupling

Chen

Wang

et al. 2022

International Journal of Aerospace Engineering

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The air distribution system is one of the key systems for ensuring the safety and comfort of the passenger aircraft. The large number of components poses a severe challenge to the efficiency, accuracy, and convergence of system simulation. For the 3D CFD method, the complex and large number of meshes leads to low computational efficiency. The 1D simulation has high efficiency, but the local accuracy is inadequate. To solve this problem, the 1D Fluid System Simulation Software Flomaster with the linearization algorithm is used to establish the system-level model. The flow characteristic curve is obtained by the CFD (computational fluid dynamics) method for the local irregular ducts and introduced into the 1D system model for iteration. The effects of local flow resistance and thermal insulation on the flow distribution and thermal performance of the system are studied using this simulation model. The results show that the local flow resistance affects the total flow and uniformity of the cabin distribution, the improvement of insulation performance is weakened with increasing insulation layer thickness, and the application of thicker insulation layers on the downstream pipeline is more advantageous to limit the maximum temperature change of the conditioned air.

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Investigating the conjugate heat transfer phenomena on various ducts for aircraft environmental control system

Cited by 2 publications

References 11 publications

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

Numerical Study of Air Distribution System for a Passenger Aircraft Based on 1D and 3D Coupling

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