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Engine Icing

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sevrien
Whisky Quebec

Engine Icing

Message par sevrien le Mer 24 Juin 2009 - 2:45

Bonsoir, bonjour, chers tous !

Aah, ... aah ! Article intéressant !

Maintenant que Boeing s'est joint à RR, pour reconnaître "engine icing" comme un "Industry-Wide problem", certains adeptes du DPO, propagandistes et autres spécialistes du véhicularg des idées reçues sur les Forum vont peut-être avoir la décence de changer de discours, ... ou simplement de se taire et de réfléchir un certain temps, avant de venit parler de nouvrau de "Engine Icing" !

Bien sûr, l'aspect traité dans l'article EST PLUS DANS LA LIGNE DE "core icing" ! Mais là n'est pas le sujet ! Le sujet est que ceux, pénétrés de parti pris, n'ont jamais voulu reconnaître le bien fondé, la nécessité même de l'approche et la pertinence des arguments de RR ! Devinez pourquoi !

Lien et commentaires (et David LEARMOUNT de Flight International ne raconta pas de bobards !).
http://www.flightglobal.com/articles/2009/06/23/328694/boeing-and-canadian-researchers-make-engine-icing-research.html
DATE:23/06/09. SOURCE:Flight International
Boeing and Canadian researchers make engine icing research breakthrough
By David Learmount
Boeing and the National Research Council of Canada believe they may have cracked the mystery of how ice can form in jet engine compressors despite internal temperatures being well above freezing, causing engine failure.
This phenomenon, which caused both engines in a Qatar Airways Airbus A330 to shut down in flight near Shanghai in 2006, has been imperfectly understood, but now the Boeing-NRCC partnership has managed to reproduce the process in a test rig.
Trop de personnes ont oublié cette histoire de Qatar (moteurs concernés : GE -CF6).
"These results are an important first step in understanding what's happening at the particle level with engine icing in ice crystal conditions," NRCC president Pierre Coulombe says. "Now we can begin the process of modelling the phenomenon to predict and prevent it."
Il y a des pilotes de ligne que ceci devraient intéresser, au plus haut point !
Coulombe is referring to the conditions under which internal engine icing has occurred, causing engine stall or flameout. At high level, in the vicinity of thunderstorms, ice crystals are believed to form in smaller sizes than is normally the case, making them less detectable to aircraft equipment such as weather radar, and changing their behaviour when they are ingested into an engine.

At the NRCC's Ottawa altitude research centre, the organisation reveals, it has been able to recreate realistic high-altitude conditions, including the freezing ambient temperatures, low pressure and the warmer conditions inside the engine.
Researchers then produced ice crystals "in the range of 70 to 200 microns in concentrations up to 15g/m3" and blew them into the simulated engine rig.
NRCC-Boeing says the result was more promising than expected. "Although the goal of the project was to create ice accretion in any quantity in a simulated engine S-duct in temperatures above 0°C [32°F], the researchers...were able to build ice formations of the size which could offset engine performance. In addition, because the tests were recorded using regular and high-speed video, they were able to determine some conditions in which accretion will and will not occur," they say.
Intéressant de lire l'approche.
Boeing's aviation safety director Corky Townsend says: "This is a critical part of Boeing's multi-step plan to tackle this important industry safety issue." There have been 14 incidents involving business jets and airliners in which the engines lost power or failed in flight. In almost all cases - including the Qatar A330 - they were successfully restarted.
D'où la pertinence des "mesures conservatoires", que nous connaissons ou apprenons, ailleurs, en attendant les solutions qui frappent les "root causes" !
Mais, surtout, il convient de remarquer la phrase, "This is a critical part of Boeing's multi-step plan to tackle this important industry safety issue."
Il est regrettable qu'il faille avoir à subir les spcialistes du parti pris, et les plémiques qu'ils génèrent, malgré l'évidence même ! Maintenant, les faits prennent le dessus !

Il est un fait que Boeing reconnaisse officiellement ce que Sir John ROSE, CEO de RR, dit depuis un certain temps ! Wink
This issue is critical because more high-level, long-range flights than ever are crossing oceanic areas via the tropics where high-altitude storm activity is normal, so the engine icing risk is increased, and this challenges the premises on which extended twin-engine operations (ETOPS) rules are based.
Réactions ?

    La date/heure actuelle est Sam 3 Déc 2016 - 10:35