Takeshi Tagashira

Simplified Analysis on Electromagnetic-Driving Fan for Aircraft Propulsion

An experimental and analytical investigation into a newly proposed electromagneticdriven fan concept is described. Environmental friendliness in aviation is a key feature in the development of future air-breathing engines, and a desirable technology to be introduced is an electromagnetic motion fan system, because it will tremendously reduce the total operating emission as well as reduce weight and increase maintainability increase energy efficiency compared to conventional aero engines. The proposed fan concept has a potential to fulfill the requirements for environmental compatibility and also possesses many other applications such as vector thrust operation. The present paper shows the results of the test on a concept verification model and the result revealed the importance of the controlling parameters to produce efficient power transmission. The accompanying analytical result further explains the motion mechanisms and gives suggestions for the novel design of the fan system.

Performance Analysis of a Fuel Cell Hybrid Aviation Propulsion System

So-called Blended Wing Body (BWB)-type aircraft can accommodate electric fan driven propulsion systems as propulsion devices, providing distributed propulsion. Our earlier report presented a motor concept that is suitable for driving propulsion fans for that aircraft configuration. This report describes an analytical model of a propulsion system power source with size based on the reference vehicle design presented previously by the authors. Take-off and in-flight conditions are presented. The combined fuel-cell and gas-turbine system shows different features in each case.

Investigation of FC/GT Hybrid Core in Electrical Propulsion for Fan Aircraft

Distributed propulsion systems have been investigated by many researchers because the propulsion system can enhance the benefits of unconventional airframe concepts such as blended wing body (BWB) aircraft. The core-separated fan propulsion system mostly considered for use in the distributed propulsion is unique compared to conventional jet engines because the propulsion fans are separated and the driving power is delivered from the core engines placed apart from the propulsion fans. Several power sources might be used, but the most promising one to realize ultralow fuel emission aircraft is electrical. This paper presents the background and the potential for research activities for the core-separated fan propulsion systems. One referenced turboelectric propulsion system was evaluated for validation using a new analytical tool. The authors are emphasizing the configuration of electric fan propulsion system powered by a SOFC-GT core. Benefits and challenges of that core configuration are explained.

Performance Analysis of Fan-Driving Electric Motors in a Fuel-Cell Hybrid Powered Propulsion System for Aviation

So-called Blended Wing Body (BWB)-type aircraft can accommodate electric fan driven propulsion systems as propulsion devices, providing distributed propulsion. Our earlier report presented a motor concept that is suitable for driving propulsion fans for that aircraft configuration, and provided preliminary sizing of the fan and motor requirement to a given reference vehicle. This paper describes a numerical simulation model of a driving-fan motor with size based on the reference vehicle design the authors presented previously. Numerical simulation is applied first to existing experimental data of the present electric motor concept. Preliminary design and analysis of the motor are provided with dimensions of the 0.71-m-diameter class fan module to be applied to the distributed propulsion system installed in the reference vehicle. Numerical simulation shows that the originally proposed shape of the rotating coil is favorable for the designated purpose, suggesting the basic configuration of the motor driving system.

ATF Test Evaluation of Model Based Control for a Single Spool Turbojet Engine

This paper introduces a model based control system for a single spool turbojet engine. It consists of a feedback control (FBC) and a component level model (CLM) enhanced by the Constant Gain Extended Kalman Filter (CGEKF). The control system is implemented on a rugged PC, and verified to run in much faster than real time, which is essential requirement for a model based control. Then, the model based control system developed is applied to an actual engine and evaluation test is conducted by using an Altitude Test Facility (ATF). Several types of model based feedback controls are evaluated under various flight conditions, giving intentional engine performance change by varying nozzle area, and intentional sensor failure. It is concluded that the model based control using CGEKF is stable and shows good control performances over the whole flight envelope.Copyright

Preliminary Design Investigation of Electromagnetic Motors for Turbofan-Drive Assist

This paper describes the procedure and status of the preliminary design investigation of a motor-assisted turbofan propulsion system used for scheduled testing. The applied motor configuration was described earlier for use of turbo/hybrid electric propulsion device. Review of earlier research emphasized the potential of the motor configuration for motor motion assistance of a conventional and/or near future turbofan propulsor. Earlier studies showed the motor configuration’s potential for motor motion assistance of a conventional turbofan propulsor or one developed in the near future. The experiment plan uses a miniaturized turbofan engine model developed at JAXA to assess multi-variable model-based optimization control with an actual turbofan engine. The modification and preliminary design procedure and analytical results are then shown in order. In the context of numerical analysis, the present design motor is expected to be applicable as an independently powered assist measure for turbofan engine control. Finally, some perspectives are given of the potential of this motor configuration for use in multi-dimensional applications.

Electromagnetic-Driving Fan for Aircraft-Propulsion Application

Recently electric and Fuel Cell ground transportation systems have been gaining importance in terms of improvement in environmental compatibility and of an increase in propulsion efficiency. There are several efforts to introduce battery and fuel cell to aviation, but the present propeller driven method has difficulty in weight and limited speed. In this paper, a newly proposed outer shell electromagnetic-driven fan is explained as an application to aero-engine use, and then for verification, the test result of fan motion mechanism and a realistic-size fan circuit analysis are presented.

Numerical Analysis of Large-Scale Tip-Driving Electric Motors for Thrust Fan

This paper shows numerical simulation results of a motor configuration suited to driving aircraft propulsion fans to elucidate the effects of the motor control parameters. Two experimental model results are shown to compare the present parametric analysis with the qualitative tendency of the motor concept. The parameters determined in the simulation were onset timing of the pulse, phase shift of the enamoring coils, rotation speed and input current. The results revealed several important control variables and underscored the possibility of optimizing the performance by changing the number of variables.

Investigation on the Potential of Hybrid Aero-Engine System with Electromagnetic-Driving Fan

The so-called Blended Wing Body (BWB)-like aircraft configuration might accompany an electric fan driven propulsion system as a propulsion device. Electromagnetic fans are good for distributed propulsion. Our earlier paper presented a motor concept suited to driving propulsion fans for the aircraft configuration. By introducing a reference vehicle with hydrogen as the fuel, a system arrangement and other key technological issues are addressed to realize a future passenger aircraft propulsion system using the fan concept. Also this paper introduces several propulsion system configurations for future passenger-aircraft propulsion systems with the fan system. Two promising arrangements of the combined system of gas turbine and fuel cell are introduced.