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A STUDY OF AN USER AND ENVIRONMENTAL FRIENDLY STORED ENERGY BASED EPU/APU-SYSTEM FOR MILITARY AEROSPACE APPLICATIONS

Prisell, Erik; Brandin, Jan LU and Lyrsell, Owe (2008) 26th International Congress of Aeronatics Science In ICAS 2008 CD.
Abstract
Modern military multi-role combat aircrafts need an emergency power system (EPU) to maintain back-up power supply for all normal and degraded flight modes.

The reason for this requirement is that modern combat aircrafts are designed with built-in relaxed or negative stability. Inability of the Flight Control System to perform continuous, corrective control surface actuation, due to loss of power supply or other causes implies instantaneous departure with loss of A/C. An emergency system needs to have a quick response and provide high power, electrical or hydraulic or combined, to a low weight and volume for considered time

Different EPU systems have been tried over the years, hydrazine (monopropellant) driven turbines,... (More)
Modern military multi-role combat aircrafts need an emergency power system (EPU) to maintain back-up power supply for all normal and degraded flight modes.

The reason for this requirement is that modern combat aircrafts are designed with built-in relaxed or negative stability. Inability of the Flight Control System to perform continuous, corrective control surface actuation, due to loss of power supply or other causes implies instantaneous departure with loss of A/C. An emergency system needs to have a quick response and provide high power, electrical or hydraulic or combined, to a low weight and volume for considered time

Different EPU systems have been tried over the years, hydrazine (monopropellant) driven turbines, compressed air and all-electric battery systems are dominating in existing applications.

Gas generator systems however show advantages, but hydrazine for example is both toxic and carcenogenic.

The operation of coming electrical weapons demands short bursts of very high power. The requirement of power, from this emerging field of applications, is conveniently fulfilled by tailoring of the EPU/APU systems approach. A small stored energy based system can also be the power source solution for electrical weapons in medium UAV’s.



FMV has since 1999 performed a study of an EPU system based on stored energy together with a turbine solution. A novel gas generator system has been developed and demonstrated which is both a user and environmental friendly. The work-performing gas is generated from catalytically enabled and supported combustion of medium concentration hydrogen peroxide and methanol. The concept was evaluated by performing a feasibility study in three phases between 1999 and 2007. This paper will present the work performed and results from these three phases. The paper covers both the results from initial studies of different EPU system concepts/solutions and from the demonstrator programs of two turbine concepts where the second concept also incorporated a working novel hydrogen peroxide/methanol gas generator.

Specific focus will be given to this novel gas generator concept which operates with a mixture of medium concentration hydrogen peroxide and methanol. The hydrogen peroxide is catalytically decomposed into steam/water and free oxygen that are used to combust the added methanol by a combustion catalyst into a high temperature ( ~600 C) working gas. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
emergency power, hydrogen peroxide, stored energy
in
ICAS 2008
volume
CD
publisher
International Council of the Aeronautical Sciences
conference name
26th International Congress of Aeronatics Science
external identifiers
  • scopus:84878925731
ISBN
0-9533991-9-2
language
English
LU publication?
yes
id
f407d013-60bf-4ae3-84b2-dae8d892cf17 (old id 1270986)
alternative location
http://icas-proceedings.net/ICAS2008/PAPERS/633.PDF
date added to LUP
2008-12-02 17:50:24
date last changed
2017-01-01 08:03:13
@inproceedings{f407d013-60bf-4ae3-84b2-dae8d892cf17,
  abstract     = {Modern military multi-role combat aircrafts need an emergency power system (EPU) to maintain back-up power supply for all normal and degraded flight modes. <br/><br>
The reason for this requirement is that modern combat aircrafts are designed with built-in relaxed or negative stability. Inability of the Flight Control System to perform continuous, corrective control surface actuation, due to loss of power supply or other causes implies instantaneous departure with loss of A/C. An emergency system needs to have a quick response and provide high power, electrical or hydraulic or combined, to a low weight and volume for considered time <br/><br>
Different EPU systems have been tried over the years, hydrazine (monopropellant) driven turbines, compressed air and all-electric battery systems are dominating in existing applications.<br/><br>
Gas generator systems however show advantages, but hydrazine for example is both toxic and carcenogenic.<br/><br>
The operation of coming electrical weapons demands short bursts of very high power. The requirement of power, from this emerging field of applications, is conveniently fulfilled by tailoring of the EPU/APU systems approach. A small stored energy based system can also be the power source solution for electrical weapons in medium UAV’s.<br/><br>
<br/><br>
FMV has since 1999 performed a study of an EPU system based on stored energy together with a turbine solution. A novel gas generator system has been developed and demonstrated which is both a user and environmental friendly. The work-performing gas is generated from catalytically enabled and supported combustion of medium concentration hydrogen peroxide and methanol. The concept was evaluated by performing a feasibility study in three phases between 1999 and 2007. This paper will present the work performed and results from these three phases. The paper covers both the results from initial studies of different EPU system concepts/solutions and from the demonstrator programs of two turbine concepts where the second concept also incorporated a working novel hydrogen peroxide/methanol gas generator. <br/><br>
Specific focus will be given to this novel gas generator concept which operates with a mixture of medium concentration hydrogen peroxide and methanol. The hydrogen peroxide is catalytically decomposed into steam/water and free oxygen that are used to combust the added methanol by a combustion catalyst into a high temperature ( ~600 C) working gas.},
  author       = {Prisell, Erik and Brandin, Jan and Lyrsell, Owe},
  booktitle    = {ICAS 2008},
  isbn         = {0-9533991-9-2},
  keyword      = {emergency power,hydrogen peroxide,stored energy},
  language     = {eng},
  publisher    = {International Council of the Aeronautical Sciences},
  title        = {A STUDY OF AN USER AND ENVIRONMENTAL FRIENDLY STORED ENERGY BASED EPU/APU-SYSTEM FOR MILITARY AEROSPACE APPLICATIONS},
  volume       = {CD},
  year         = {2008},
}