# How much air does a GE90 ingest at sea level and at cruise level per meter?

I just wanted to know how much air PER METER a GE90 turbofan engine sucks in considering the same thrust output at different altitudes to better understand how the engine can travel further while burning the same amount of fuel at cruise level.

As we all know, air gets thinner as we go higher. The engine operates at a certain air-fuel ratio, and that means that at ground level where air is thicker the engine needs to travel less metres to ingest enough air to combust a unit of fuel then when it is at, say, 35.000 feet.

I found elsewhere that the GE90 operates at an air-fuel ratio of 33,3:1 meaning that it needs 33,3kgs of air to combust 1kg of fuel.

What I'd like to know is how many metres it has to travel to ingest said mass of air at ground (sea)level with a density of 1,2985 kg/m3 at 19C° and at 11.000 metres with a density of 0,3639 kg/m3 at -56,5C° (values taken from the table at this page)

Can anybody provide any help?

• This has to be something to do with a university assignment. That data is so specialized you need to contact someone at GE tech support or their engineering organization that can help you out. – John K Jun 4 '18 at 17:15
• Can you expand on why you think an engine needs to travel to ingest air? – ymb1 Jun 4 '18 at 17:59
• The reason it can travel further with the same amount of fuel has to do with the drag of the aircraft being lower, it can go faster with the same thrust. – TomMcW Jun 4 '18 at 18:53
• I'm voting to close this question as off-topic because the premise of the engine needing to travel a certain distance to be able to consume air for combustion is incorrect, therefore any answer would have to rewrite the question entirely. – Ron Beyer Jun 5 '18 at 1:04
• The question is about the operation of an aircraft engine. It doesn't turn into another topic just because OP's assumptions are incorrect. It does make it unclear what is being asked, and that needs clarification. If he asked about mass flow instead of meters it might work. – Pilothead Jun 5 '18 at 5:42