No-Bleed Systems

No-Bleed Systems.

Progress aircraft and ballistic capsule systems are, so far, one of the most revise countries in air power industry. From the really beginnings, these system are twine together to the aircraft’s public presentation. Every twelvemonth, more systems are tested, reappraisal, and redesign into better progress applications. A response to guarantee the continuity for aircraft public presentations in air power industry, is still to be consider, a first line of responsibility. Aircraft’s designs and systems, allocate many applications such as the following coevals in avionics and other sub-systems. With new methodological analysiss and technological promotion in aerospace industry, aircraft’s systems can turn to better operational executions and supply feedback for safety environments.

In recent old ages, most aircraft’s systems shaped the manner in which air power is heading. A chief focal point on these developments is the systems redesigning stage. A redesigning stage, reenforce the aircraft public presentation by agencies of old penetration to achieve aircraft lack. By admiting system’s background, it allows better proactive and reactive procedures in the line of safety and public presentation. A really of import facet, is the overall endurance. Endurance attack must convey through all aircraft’s systems. These systems are the driving motor of the aircraft ; without a proper integrating, it could take to a entire structural failure. When a system ( s ) is non decently turn toing and/or moving as the demand provinces, it is consider to be inefficient. Supplying efficient work capacity through all systems is a minimal and indispensable status. As portion of an ageless procedure, air power industry is repeating to research executions to turn to situational consciousness sing aircraft’s systems and public presentation. The continuity of supplying support to research countries, are really advantageous to this industry. It leads to turn to lacks in merchandises, systems, services, safety factors, and human developments.


One of the most of import cardinal constituent in an aircraft’s systems, is the APU. Currently, the subsidiary power unit ( APU ) is chiefly a ‘gas turbine engine’ , which supplies energy to different systems. It is besides a self-sufficing system, when the aircraft is in land operations. Among the current APUs, there is the 131-9 Honeywell series. “The 131-9 Honeywell series measures 32.8 inches/cm in the forepart and 52.0 in/cm on the sides ; it is rated EGT is 1100 grades Fahrenheit and a rotor velocity of 48,800 revolutions per minute for upper limit rated ( Honeywell Aerospace, January 2008, pg. 2/2 ) .” This APU is light weight and low-cost care operational cost in comparing to other commercial trade names.

With a great trade of service hours ( & A ; gt ; 10,000 hour. ) for MTBCR and MTBUR, this APU meets the minimal noise demand and is besides cost efficient. The design cost for low cost on aircraft care, with a entire one-year cost of $ 1,946 V other rivals high monetary values ( Honeywell Aerospace, November 2007, pg. 2/4, 2nd paragraph ) .

Another radical construct has being develop by Airbus DLR German Aerospace Centre and Parker Aerospace, a proton exchange membrane fuel cell system ( PEMFCs ) . Similar fuel cell constructs has comes from the aerodynamic rules and extended work to better the overall aircraft public presentation. “This new fuel cell system consist a H armored combat vehicle, heat money changers, and fans in the tail subdivision ; while the fuel cells will be positioning in the lading clasp ( The Flying Engineer in General Aviation, September 18, 2012, 3rd paragraph ) .” Fuel cell systems can better the aircraft design, from gas engine to better subsidiary power system. Leading to environmental friendly and efficient systems since green goodss low emanations and better noise attainment.

A little but easy to rectify mistake was found in this system, when making an disposition trial. “The system decreases the electromotive force of the cell when is positioning at an angle of 30 grades. Since the byproduct of the system is H2O ( 10 litre of pure H2O ) , its direction creates an instability ( G. Renouard-Vallet, J. Kallo, A.K. Friedrich, J. Schirmer, M. Saballus, and G. Schmithals, 2010, Pg. 273-276 ) .”

As an attack to a conceptual aircraft, a airy design will let room to a wide class of actions. The general thought, is to prosecute systems that contributes to reenforce old designs ; while leting new constructs for progress aircrafts. A design will mean to turn to constructs for cost, environmental factors, public presentation, and design comparing. Let start by comparing the old two theoretical account, as they will supply penetration for best choosing.

The 131-9A APU is a singular attack for this conceptual design. To get down, the 131-9A care cost, makes it low-cost and the overall design has proven to be an efficient one ; with new execution to do it environmental friendly, this design is a great pick. Furthermore, the stuffs used complement the construct for light weight systems and fuel ingestion. Light weight system, allows room for more lading or riders, and better fuel public presentation. These APU theoretical account provides power to the pneumatic system. The following coevals of fuel cell systems is headed into a new attack, to extinguish the gas engine APU system. By redesigning the current APUs operational facets, these fuel cell besides meet the demand of light weight systems. This last attack non merely allows room for other executions as for the 131-9A, but besides betters the chief engines public presentation. The PEMFC system is still on a research stage. Its accomplishments, will be address by the twelvemonth 2015, with the Airbus A320 flight trial. The environmental factors of this design are the one of the best applications. This fuel cell construct, is based on a H and O chemical interactions. Leaving the environmental factors in a good quality criterion, for non-pollutant systems.

“Currently, the Airbus, A 320 APU emits 0.15 HC ( g/kg ) , 2.05 of CO ( g/kg ) , and 10.10 of Noten( g/kg ) ( Antonio Filippone, 2012, pg. 148, table 5.5 ) .” With a new attack to fuel cell system, this APU will be absorbed wholly by an progress system. “It Acts of the Apostless as an independent beginning, capable of supplying power to other systems ( The Flying Engineer in General Aviation, September 18, 2012, 3rd paragraph ) .” Furthermore, the criterions addressed by the PEMFC’s can be stated as follow.

With the production of H2O, H2O vapour, electrical power, heat and inert gas ; it does non bring forth CO2or NOten. The H2O can be used to make full H2O armored combat vehicles and be distribute for toilets, galley, and humidification. Minor accommodation to the pH of the H2O are needed to do it potable ( Martin Keim, Josef Kallo, K. Andreas Friedrich, Claudia Werner, Martin Saballus, Florian Gores, 2013, Pg.330-338 ) .

A conceptual fuel cell system, will be ideal for this for a commercial blended flying aircraft design. Conceptual cost and public presentation for this system, is per se related to overall aircraft design. Cost is ever a subject to be address by the air power industry, inquiries as: It is low-cost? What about the care and other operational cost? Are the maker willing to treat such executions? And, will the FAA allowed such designs ( safety factors involve ) ? All these inquiries can non be answer if the first measure to progress system is non pursue. With better research applications, the operational, safety and public presentation this inquiries are address. “The cost for the Honeywell 131-9A APU, the one-year labour cost per APU is $ 1,946 ( Honeywell Aerospace, November 2007, pg. 2/4, bottom figure ) .”

The expected cost for the H fuel cell is still considerable high because of the refined dodo fuel system. More companies are presently concentrating on this facet, with composite stuff that allows better and more low-cost parts and other agencies to get H fuel from resources such as other fuel combinations that provides adequate energy to power the aircraft’s systems. This conceptual fuel cell is an equal pick for the conceptual aircraft design. Therefore, the care inspection and repair will be stated to be the same as the engines care or every 2,800 hours as upper limit is requirement. This design will pull off fuel ingestion, engine efficiency, environmental factors, and lading capablenesss.

Pneumatic vs. No-Bleed Systems. A typical pneumatic power system, is provided by the followers: chief engine bleed systems, subsidiary power unit ( APU ) , and land power unit system ( GPU ) . Before the bleed air passes through this systems, it must be heated and pressurized. After the air is conditioned to proper criterions, it will be used by other sub-systems such as the anti-ice, H2O, engine starting, hydraulic, air conditioning ( AC ) , and pressurization of the cabin. The pneumatic system contains a manifold system which collects all the air driven by all other bleed systems and two air battalions for each side of the aircraft. In this system, a valve divides the left side from the right side. If one side is closed from the other, the bleed air can still be provided by the one of the chief engines, APU, and land power unit when available.

The pilot controls the pneumatic system from the cabin by the flight control system. In the flight control system, the valve can be set to be unfastened, car, and near. In an unfastened cringle or entree, the valves will let a complete air flow from any constituent of the bleed system. On car, the system provide bleed air as requires. When the valve are closed, the left side is wholly closed from the right side of the pneumatic system. An independent electro-pneumatic or pneumatic system is compose of fans, heat money changer, air rhythm unit, air starting motor, and valves. This pneumatic system with pipes and valves add a considerable weight to the aircraft. Furthermore, this system is non fuel efficient and requires bleed air taken from the engines.

In a no-bleed system, the air coming from the engines causes a Loos of push. Since the conceptual aircraft does non requires the anti-ice and the hydraulic system to be powered by the pneumatic system, this allows better public presentation. The pneumatic system is so replace by an electrical system ( no-bleed air ) , similar to the B787. With the incorporation of an electrical system, a light weight capableness is besides achieved. This electric system besides needs a goaded generator and an electrical driven compressor, for a uninterrupted force per unit area and air flow. “The goaded generator will be connected in series to the chief engines and supply power to most of the aircraft’s systems ( Boeing, 2008, Article 02, pg.2, paragraph 2 ) .” The electrical system is powered by the engine driven and fuel cell generator ( see figure a ) . A typical compressor, approved by the FAA uses two to three phases ; for the conceptual design this last one will be used as a safety demand. Further research application will let this system to utilize composite stuff to let a down-size version with a light weight and operational accomplishments. Care for the conceptual compressor will be perform day-to-day, to guarantee safety. The day-to-day care demands include alteration of oil, replenish air armored combat vehicle and force per unit area testing, and cleansing every bit stated in the direction manual. Therefore, in a conceptual design, a compressor under the FAA ordinance will be used.

For high force per unit area, the demand for the air bottle must be between 1,000 pounds per square inchs and 3000 pounds per square inch. Average force per unit area ( 50-150 pounds per square inch ) : it draws air from the compressor subdivision of the engines. For low force per unit area, a four chamber pump can provide a uninterrupted compressed air ( FAA, 2012, Chap. 12, pg. ( 12-48 ) – ( 12-53 ) ) .

Environmental Control ( Air conditioning and cabin pressurization ) . The environmental control system is compose of high efficient air and gaseous filters, four electric cabin compressors and air conditioning battalions. “The cabin air comes from the random-access memory air recesss on each side of the planes’ belly and won’t base on balls through the engines, says Mike Sinnett, the 787 undertaking manager ( Marilyn Adams, 2006, paragraph 14 ) .” The air coming from this recesss into the cabin pressurization and A/C. A light weigh criterions for ozone riddance and O convertor are indispensable for the conceptual design. The air inside the cabin and the humidification must go through through two procedures: a catalytic air pollution control ( an ozone remotion abater ) and the high efficient filters. For optimal accomplishment, the ozone and O convertors are reinforce by a ceramic stuffs. “Moreover, these ceramic stuff allows residuary atoms attainment at a considerable activity of 20,000 flight hours ( Ronald M. Heck, Robert J. Farrauto, Suresh T. Gulati, 2012, Pp. 361-372 ) .”

The catalytic air pollution control unit and random-access memory air recesss will be located under the aircraft’s belly. The air conditioning and cabin pressurization are electrically dependent from the driven compressor. In add-on, “the electrical compressor drives the compress air by a velocity motor. It flows through low force per unit area and the air conditioning battalions for efficiency ( Boeing, 2008, Article 02, pg.2-4, paragraph 3 ) .” The pressurization and humidification procedure are set to be automatic and altered when needed. If the maximal passenger’s capacity is non achieve, this machine-controlled system compensates by seting the sum of force per unit areas and humidification. A really of import construct to be included, is the fuel ingestion ; which is achieved by this adjustable system.


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