Electromagnetic &amp; thermal analysis of synchronous generator with different rotor structures for aircraft application

Kurt

International Journal of Aerospace Engineering

et al. 2021

On-board electrical systems are the key components of each modern aircraft. They enable its safer, more comfortable, and environmentally friendlier operation. The strict regulations to reduce pollution and noise are produced by aircraft eventuated in projects like Clean Sky or ICAO Global Coalition for Sustainable Aviation. One solution to environmentally friendlier operation is the full electric propulsion of the aircraft, which enables the reduction of both noise and pollution. Such a concept requires a total change of all on-board power systems and enables the profound change in aircraft design. This paper presents the evolution of aircraft power systems into the so-called more electric aircraft (MEA) and discusses the state-of-the-art electrical systems. Furthermore, the concept of all-electric aircraft (AEA) is presented here.

“…The speed of S/G proposed in [115] is in the range of 20000 to 32000 rpm. The effect of temperature on electrical machines is investigated in [117,118].…”

Section: Evolution To More/all-electric Aircraft Conceptmentioning

confidence: 99%

Perspectives and Development of Electrical Systems in More Electric Aircraft

Kurt

International Journal of Aerospace Engineering

et al. 2021

“…What is worse, the small volume hinders massive heat dissipation for the limited heat removal area. Thus, the issue of thermal protection will become an increasingly critical concern for its operation [ 6 ], where an effective heat dissipation method and thermal analysis based on that heat dissipation method are critically needed for BLSG operation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Thermal Performance of Nanofluid-Based Cooling System for Synchronous Generators

Xiong

et al. 2019

Entropy

This paper presents a nanofluid-based cooling method for a brushless synchronous generator (BLSG) by using Al2O3 lubricating oil. In order to demonstrate the superiority of the nanofluid-based cooling method, analysis of the thermal performance and efficiency of the nanofluid-based cooling system (NBCS) for the BLSG is conducted along with the modeling and simulation cases arranged for NBCS. Compared with the results obtained under the base fluid cooling condition, results show that the nanofluid-based cooling method can reduce the steady-state temperature and power losses in BLSG and decrease the temperature settling time and changing ratio, which demonstrate that both steady-state and transient thermal performance of NBCS are improved as nanoparticle volume fraction (NVF) in nanofluid increases. Besides, although the input power of cycling pumps in NBCS has ~30% increase when the NVF is 10%, the efficiency of the NBCS has a slight increase because the 4.1% reduction in power loss of BLSG is bigger than the total incensement of input power of the cycling pumps. The results illustrate the superiority of the nanofluid-based cooling method, and it indicates that the proposed method has a broad application prospect in the field of thermal control of onboard synchronous generators with high power density.

“…Due to the increasing number of daily flights around the world, enhancing flight efficiency would result in huge savings for aircraft operators [1][2]. Many researchers tried to increase the efficiency of aircraft operation using various approaches; Park et al [3] proposed an efficient design process based on Collaborative Optimization (CO).…”

Section: Introductionmentioning

confidence: 99%

Boosting Aircraft Efficiency by Reversing the Load on the Horizontal Stabilizer

Al-Habahbeh¹,

Abu-Elola²,

Rousan³

et al. 2019

IJRTE

This work aims at finding how reversing the direction of THS force improves aircraft performance. In most airplanes, the trimmable horizontal stabilizer (THS) is subjected to downward air force. This downward force acts in the same direction as the weight and opposite to the lift. The produced extra lift can be used to increase the payload or extend the range of the aircraft by carrying more fuel. The proposed design is based on shifting the wings location forward in order to make the force on the THS upward instead of downward. However, the stability of the airplane will be adversely affected. To address this issue, modern control theory is applied to the airplane elevator so as to maintain longitudinal stability. An airplane model based on longitudinal dynamics was used to investigate the stability of the airplane. Both current and proposed designs are simulated first without controllers and then with active controllers. The longitudinal dynamics’ equations are used to design the controllers so as to make the aircraft stable. The payload gain due to the proposed design is calculated; For a typical airliner, it is found that up to 21% increase in payload can be achieved using the proposed design. The proposed design where the load on the THS becomes upward instead of downward results in improving flight efficiency; that is, we can choose between increasing payload, extending the range, reducing the thrust, or using a smaller wing, or any combination of these benefits. In all these cases, there is an operational advantage. This advantage is translated to cost savings or higher revenues.