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Engine jet
How ul start a Jet engine in higher altitudes ?
Usually Jet engine's are started with GTSU(Gas Turbine Starter Unit) but GTSU's work with in the altitude of 6km's... beyond that if the power plant is turn'd off how you'l start it?
A jet engine GTSU only provides air to rotate the jet engine to provide rotation -
In flight, at high altitude, the engine rotates due to the airspeed -
So a start unit is not required -
All that is required, is fuel and ignition -
In a 747 - we can restart windmilling engines succesfully at 30,000 feet -
Procedure: Ignition ON - Start Lever ON - Monitor Rising EGT, RPM, OIL P -
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Jim's Valveless Pulsejet Engine
How do you calculate the ratio of core thrust vs bypass thrust at various altitudes on a jet engine...?
More specifically what variables do I need to know to figure these two ratings from total thrust? I tried using NASA's jet engine simulator but the basic version doesn't give me enough parameters and the download version I cant get to work. Any jet propulsion engineers floating around out there!? 
Look up the engine on the manufacturers website.
high bypass engines usually have 10x the core thrust, its more efficient that way. also, the goal is to not have lots of core thrust (keep the air subsonic through all 10-12 stages of compresor and 10 or so stages of turbine.
if you want to estimate the core thrust then look for the optimum fuel consumption schedule in pounds per hour, then determine the airmass flow requirement for combustion...factor 60-75% overall efficiency. the best fuel mixture is fairly rich with respect to stoiciometry. too hot and you start stressing things.
wer
{ 1 comment }
Dear,
Can I ask a small question about the eclipse plugin (last version) usage.
Is it possible to export a GWT 1.6 project to a jar or to deploy the GWT-application to a glassfish-server direct in stead of deploy to the Google Applic Engine? (I don't have a Google Applic Engine (jet), and I need ssh connection to our systems)
thanks.
Patrick.
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