Power is adjusted in a gas turbine engine by
- increasing fuel flow.
- increasing air and fuel flow.
- increasing airflow to the combustion chamber.
Explanation from PART66Online
Power in a gas turbine is controlled by metering fuel: opening the throttle increases fuel flow to the combustion chamber, raising gas temperature, RPM and thus thrust. Airflow is not directly controlled by the pilot; it follows automatically from the change in engine speed produced by the altered fuel flow.
J
JD2016 asked · 31 Oct 2016
How exactly is the air flow increased? Is it not the case that to draw more air into the engine, the compressor needs more power which needs more power output from the turbine which means higher fuel flow first.
Community Comments (3)
J
JD2016
20 Nov 2016
Another version of this question gives adjusting fuel flow only, as the answer.
J
JD2016
8 Dec 2016
Page 96 of "The Jet Engine" - published by Rolls Royce:
"The control of power or thrust of the gas turbine engine is effected by regulating the quantity of fuel injected into the combustion system. When a higher thrust is required,the throttle is opened and the pressure to the fuel spray nozzles increases due to the greater fuel flow. This has the effect of increasing the gas temperature, which in turn increases the acceleration of the gases through the turbine to give a higher engine speed and a correspondingly greater airflow, consequently producing an increase in engine thrust."
"The control of power or thrust of the gas turbine engine is effected by regulating the quantity of fuel injected into the combustion system. When a higher thrust is required,the throttle is opened and the pressure to the fuel spray nozzles increases due to the greater fuel flow. This has the effect of increasing the gas temperature, which in turn increases the acceleration of the gases through the turbine to give a higher engine speed and a correspondingly greater airflow, consequently producing an increase in engine thrust."
J
Jordi
5 Jul 2020
so it this question wrong?
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