DE19600043C1 - Aerodynamic lining for an aeroplane fuel dumping system - Google Patents
Aerodynamic lining for an aeroplane fuel dumping systemInfo
- Publication number
- DE19600043C1 DE19600043C1 DE1996100043 DE19600043A DE19600043C1 DE 19600043 C1 DE19600043 C1 DE 19600043C1 DE 1996100043 DE1996100043 DE 1996100043 DE 19600043 A DE19600043 A DE 19600043A DE 19600043 C1 DE19600043 C1 DE 19600043C1
- Authority
- DE
- Germany
- Prior art keywords
- aerodynamic
- pipe
- dumping system
- lining
- polystyrene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 7
- 229920002223 polystyrene Polymers 0.000 claims abstract description 9
- 239000004793 Polystyrene Substances 0.000 claims description 7
- 238000005253 cladding Methods 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 239000003350 kerosene Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/14—Filling or emptying
- B64D37/20—Emptying systems
- B64D37/26—Jettisoning of fuel
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Die Erfindung betrifft eine aerodynamische Verkleidung aus Poly styrol mit Sollbruchstelle für das Endrohr des Treibstoffablaß system (Fuelpumpsystem) an Flugzeugen.The invention relates to an aerodynamic fairing made of poly styrene with predetermined breaking point for the tailpipe of the fuel outlet system (fuel pump system) on aircraft.
Die meisten Flugzeugtypen mit Langstreckeneignung sind mit einem Treibstoffablaßsystem (Fuelpumpsystem) zum Reduzieren des Flug zeuggewichtes ausgerüstet. Das zum Ablassen des Kerosins angebrach te Rohr (in der Regel pro Flügel ein Rohr) endet etwa 10 cm hinter der Hinterkante des Flügels. Bei einigen Herstellern befindet sich dieses Endrohr unterhalb des Flügels am hinteren Ende eines Lande klappenträgers. Gemeinsam haben alle Lösungen, daß die Rohre keine aerodynamische Verkleidung haben. Das heißt, daß die Luftströmung am Rohr abreißt und einen Luftwiderstand (Druckwiderstand) verur sacht.Most long-haul aircraft are with one Fuel drain system to reduce flight tool weight equipped. That started to drain the kerosene te pipe (usually one pipe per wing) ends about 10 cm behind the rear edge of the wing. With some manufacturers this tailpipe below the wing at the far end of a country flap carrier. All solutions have in common that the pipes do not have aerodynamic fairing. That is, the air flow tears off at the pipe and creates an air resistance (pressure resistance) gently.
Die Forderungen der Luftfahrtbehörden müssen erfüllt werden. Aero dynamische Verkleidungen müssen im Ernstfall das Rohrende vollstän gig freigeben und dürfen den Rohrquerschnitt nicht verkleinern. Außerdem muß ein ungehinderter Austritt des Kerosins sichergestellt sein; es dürfen keine Verwirbelungen entstehen.The requirements of the aviation authorities must be met. Aero In case of an emergency, dynamic cladding must completely fill the pipe end release gig and must not reduce the pipe cross-section. In addition, an unobstructed escape of kerosene must be ensured be; there should be no turbulence.
Bewegliche Funktionsteile sind zu vermeiden, weil die Gefahr der Ver eisung und damit der Fehlfunktion sehr groß ist. Keine Abhängigkei ten von Elektrik, Hydraulik oder Pneumatik für das Loslösen der Ver kleidung.Movable functional parts should be avoided because of the risk of ver icing and thus the malfunction is very large. No dependency of electrics, hydraulics or pneumatics for releasing the ver dress.
Das Abwerfen von Funktionsteilen ist generell verboten. Eine Ausnahme besteht nur, wenn durch das abzuwerfende Teil keine Gefährdung für Leib und Leben besteht.Throwing off functional parts is generally prohibited. An exception exists only if the part to be discarded does not endanger Life and limb exist.
Die Aufgabe der Erfindung ist es daher, eine Vorrichtung zu schaffen, die eine Treibstoffeinsparung bei Flugzeugen zur Folge hat, indem diese Vorrichtung den Luftwiderstand des Flugzeugs verringert.The object of the invention is therefore to create a device which results in aircraft fuel savings by this device reduces the aerodynamic drag of the aircraft.
Im folgenden wird die Erfindung anhand des Flugzeuges Boeing 747 näher erläutert.In the following, the invention is based on the Boeing 747 aircraft explained in more detail.
Ein aerodynamisch gestalteter Polystyrolkegel mit Sollbruchstelle wird über das Rohrende gestülpt und festgeklebt. Wird nun Kerosin über das Notablaßsystem zum Rohrende gebracht, drücken die Treib stoffpumpen in den Tanks mit einem Druck von 30 psi (2 kp/cm²) gegen das verschlossene Rohrende und bricht das massive Kegelende (Gewicht 20 g) vollständig ab. Der Weg für das Kerosin ist frei. Die maximale Zugfestigkeit im Bruchbereich vom zu verwendenden Polystyrol mit Härtegrad 25 liegt bei 3,3 kp/cm².An aerodynamically designed polystyrene cone with a predetermined breaking point is put over the pipe end and glued. Now becomes kerosene Brought to the end of the pipe via the emergency drainage system, the drive presses cloth pumps in the tanks with a pressure of 30 psi (2 kp / cm²) against the closed pipe end and breaks the massive cone end (Weight 20 g) completely. The way for the kerosene is clear. The maximum tensile strength in the fracture range of the one to be used Polystyrene with degree of hardness 25 is 3.3 kp / cm².
Der Pumpendruck auf den Polystyrolkegel beträgt etwa 86 kp. Die notwendige Kraft zum Wegbrechen des Kegels beträgt etwa 33 kp. Querschnittsfläche auf die der Pumpendruck wirkt: 43 cm².The pump pressure on the polystyrene cone is about 86 kp. The force required to break off the cone is approximately 33 kp. Cross-sectional area on which the pump pressure acts: 43 cm².
Bruchfläche des Polystyrolkegels: 10 cm².Fracture area of the polystyrene cone: 10 cm².
Fallversuch des abgesprengten Kegelendes ergab:
Fallgeschwindigkeit 7 m/s (25 km/h), Lage des Kegels stabil waagrecht.A drop test of the blasted off cone end showed:
Falling speed 7 m / s (25 km / h), position of the cone stable, horizontal.
Durch die aerodynamische Verkleidung wird der aerodynamische Wider stand am Rohrende drastisch verringert. Die dadurch erzielte Treib stoffeinsparung wird laut Boeing Company mit 0,012% vom Gesamttreib stoffverbrauch angenommen (B 747). Die Annahmen von Airbus Industrie liegen bei etwa 0,015% des Gesamtverbrauchs. Dies ergibt bei einer durchschnittlichen Einsatzzeit einer B 747 von 14 Stunden/Tag eine Einsparung von 18 kg/Tag an Kerosin.The aerodynamic fairing is the aerodynamic contradiction was drastically reduced at the end of the pipe. The resulting blowing According to the Boeing Company, material savings will be 0.012% of the total substance consumption accepted (B 747). Airbus Industrie's assumptions are around 0.015% of total consumption. This results in a average operating time of a B 747 of 14 hours a day Savings of 18 kg / day in kerosene.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1996100043 DE19600043C1 (en) | 1996-01-02 | 1996-01-02 | Aerodynamic lining for an aeroplane fuel dumping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1996100043 DE19600043C1 (en) | 1996-01-02 | 1996-01-02 | Aerodynamic lining for an aeroplane fuel dumping system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19600043C1 true DE19600043C1 (en) | 1997-04-30 |
Family
ID=7782069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1996100043 Expired - Fee Related DE19600043C1 (en) | 1996-01-02 | 1996-01-02 | Aerodynamic lining for an aeroplane fuel dumping system |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE19600043C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8888046B2 (en) | 2008-09-22 | 2014-11-18 | Airbus Operations Gmbh | Fuel management system |
-
1996
- 1996-01-02 DE DE1996100043 patent/DE19600043C1/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| NICHTS ERMITTELT * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8888046B2 (en) | 2008-09-22 | 2014-11-18 | Airbus Operations Gmbh | Fuel management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8100 | Publication of the examined application without publication of unexamined application | ||
| D1 | Grant (no unexamined application published) patent law 81 | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |