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Sand Effects On Engines  
User currently offlineDaViD b. From United States of America, joined Jun 2001, 3148 posts, RR: 5
Posted (11 years 5 months 1 day 20 hours ago) and read 1956 times:

War-tech related question. How well does a turbine stand up to sand ingestion? Turbojets and turboshafts mainly.

Can a plane like a F-15 or a helo fly during today's brutal sandstorm or do they have to be grounded?




Teenage-know-it-alls should be shot on sight
3 replies: All unread, jump to last
 
User currently offlineBroke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 1, posted (11 years 5 months 1 day 20 hours ago) and read 1941 times:

Sand can have a couple of effects on a turbine engine.

First, the sand can abrade the compressor blades resulting in reduced engine power and eventually compressor stalls due to reduce stall margin or, in extreme cases, blade failure due to the blades being abraded down to very thin airfoils.

The other problem is sand getting into the passages from the compressor that supply cooling air to the turbine vanes and blades. These passages are very small and can be plugged up or the sand can make its way into the blade and vane cooling passages, melt, and cause blade or vane failure due to contamination of the metals or coatings.

Vanes are airfoils that are fixed and blades are airfoils that rotate.

In modern turbine engines, inlet temperatures to the first stage turbine nozzle guide vanes can reach 2500 degrees F at high engine power.


User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 2, posted (11 years 5 months 1 day 9 hours ago) and read 1851 times:

Some engines are designed for such conditions though. The CT7 engines of the Apache are, for instance. They have a separator built into the inlet which picks out sand and other FOD from the intake air. On the CT7 equipped aircraft I worked with, the bypass duct sent it all into the oil cooler instead (if the prop and the engine didn’t get that sparrow, the oil cooler would!), but that’s a different story. The fact that the rotor blades of the Apaches can’t take the sand anyway is another different story...

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineTom775257 From United Kingdom, joined Dec 2000, 153 posts, RR: 0
Reply 3, posted (11 years 5 months 1 day ago) and read 1785 times:

On the Chinook, there is a centrifugal separator on the inlet that 'spins out' any small objects entering the inlet, these are then dumped over-board.

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