International Journal of Astronautics and Aeronautical Engineering

ISSN: 2631-5009   Impact Factor = 0.52*   DOI: 10.35840/2631-5009

Research Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7512

Safety Analysis for Resilient Complex Socio-Technical Systems with an Extended Functional Resonance Analysis Method

Takayuki Hirose, Tetsuo Sawaragi, Yukio Horiguchi and Hiroaki Nakanishi
Abstract

The safety of complex Socio-Technical Systems highly depends on the non-linear interaction of variabilities between task performances in human, machines and working environments and proper management of those is essential to ensure the safety.

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Research Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7511

Design and Testing of a Cooling Fan for Electro-Mechanical Actuators for Aerospace Applications

W Wu, YR Lin, O Mesalhy, JP Kizito, QH Leland and LC Chow
Abstract

Air cooling with wing bay air circulated by axial flow fans is the most suitable and viable way in cooling aircraft Electro-mechanical Actuators (EMAs) used for flight control surfaces. The main objective of the cooling fan is to deliver high static pressure head and high volumetric flow rate overall operating ambient conditions (ambient pressure from 0.2 to 1 atm).

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Review Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7510

Studies on Two-Mode Spray Combustion

Lixing Zhou and Fang Wang
Abstract

Up to now the mechanism of spray combustion is considered as the un-ignited droplets evaporating in continuous gas flames, both in RANS modeling, LES and point-particle DNS. However, still in the 50's of the last century, experiments indicated that the spray combustion has different modes; it may be brush-like droplet diffusion flame-lets or cold droplets evaporating in blue gas flames. In this paper preliminary studies are made for two-mode spray combustion. At first a simplified analytical 1-D model for two-mode spray flame propagation is presented. The predictions are in agreement with the experimental results. The results indicate that different pre-vaporization fraction and different droplet sizes produce different flame modes.

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Review Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7509

Analysis of Accelerating Devices for Enclosure Wind Turbines

Ahmad Sedaghat, Rafat Al Waked, M El Haj Assad, Khalil Khanafer and Muath NA Bani Salim
Abstract

There are fundamental differences between internal and external flows over short hollow devices. For internal flows, the outflow velocity in a pipe with constant cross section is unchanged, in a nozzle is accelerated, and in a diffuser is retarded. This is tempting for general wind turbine practitioners to develop enclosure type wind turbines for accelerating wind speed and augmenting wind power. In this study, the short hollow accelerating devices without interaction of wind turbines is investigated in vertical orientation using analytical and CFD (Computational Fluid Dynamics) techniques.

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Research Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7508

On 'Initial Regime' Cross Flow-Induced Vibration Predictions of Rigid Cylindrical Structures with High Wake Turbulence

AY Elbanhawy and A Turan
Abstract

Numerical simulations are studied for a circular cylinder undergoing Flow-Induced Vibration (FIV) in highly turbulent cross-flow. The study focuses on wake turbulence and its interaction with the structural response being set in a single degree of Freedom. A novel contribution is presented, where a Reynolds number of 140,000 is numerically studied for FIV-Wake interaction. An unsteady numerical framework is employed for the simulations, incorporating an Arbitrary Lagrangian Eulerian (ALE) method for the associated grid deformation to simulate the coupled motion of the circular cylinder at the starting zone in a typical cylinder-flow response map or what is termed `initial regime'.

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Review Article  |   Volume 2, Issue 2 DOI: 10.35840/2631-5009/7507

Interstellar Travel by Hyper-Space Navigation System

Yoshinari Minami
Abstract

An interstellar travel within a human lifetime is considered as utterly impossible. The interstellar travel used Special Relativity is well known. However, there exists the problem of the twin or time paradox. In addition, although space warp using wormhole is also well known, the size of the wormhole is smaller than the atom, and moreover, the wormhole is predicted to fluctuate theoretically due to instabilities. Assuming hyperspace as being characterized by imaginary time, it is shown that the limitations due to the extremely long time required for interstellar travel are removed.

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