Gasturbine Performance Deel 3

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What is a property of a TAPS combustion chamber?

Combustion takes place at the stoichiometric ratio.

Mixing of fuel and air takes place before atomization. (correct)

Through holes in the casing cooling air is supplied.

When atomizing the fuel all nozzles are used.

One of the prohibited areas in the fuel metering graph is labelled as 'Stall Area'. In this area the fuel-air ratio increases too much. As a result, the ...

air expands too much in the turbine (correct)

air ignites too early in the combustion chamber

flame is extinguished

TIT becomes too high

The principle of propulsion by aircraft gas turbines is the increase of the … of the air.

density

pressure

temperature

velocity (correct)

How many times does the piston move up during the thermodynamic cycle of a 4-stroke engine?

2 Signup and view all the answers

Molecules of an ideal gas …

have zero volume Signup and view all the answers

In a petrol engine whose thermodynamics is described by the Otto-cycle, the ignition is:

isochoric Signup and view all the answers

Due to the divergence of a turbofan inlet, the (1) … of the air (2) …

(1) temperature (2) increases Signup and view all the answers

I Enthalpy and total enthalpy have the same value in a gas flow with zero velocity II Temperature and total temperature have the same value in a gas flow with zero velocity

(I) right (II) right Signup and view all the answers

Applying the First Law of Thermodynamics to the combustion chamber means:

Δ𝐻 = 𝑄 Signup and view all the answers

What can be determined in a p-V diagram from the area encircled by the Brayton-cycle?

Specific work Signup and view all the answers

If we consider the losses in the combustion chamber, then the total temperature immediately after the combustion chamber is … when we don’t consider losses.

as high as Signup and view all the answers

(I) When cruise altitude increases the thrust decreases (II) When cruise altitude increases the specific thrust increases

(I) right (II) right Signup and view all the answers

What percentage of the air flows through the core of a turbofan with a BPR of 4?

20% Signup and view all the answers

What type of mounting is shown in the picture?

An axial firtree Signup and view all the answers

In the compressor the absolute velocity in the rotor (1) … and in the stator (2) …

(1) increases (2) decreases Signup and view all the answers

The picture shows a velocity triangle at which (1) … can occur. This is caused by a too (2) … axial velocity.

(1) stall (2) low Signup and view all the answers

The function of the VSVs is to prevent stall in the …

LPC Signup and view all the answers

Not every component of a gas turbine has as many stages. Rank the following components to an (average) increasing number of stages!

radial compressor; turbine; axial compressor Signup and view all the answers

During which phase of flight is Active Clearance Control of interest?

Cruise Signup and view all the answers

What is NOT a function of the air surplus that is fed to the combustion chamber?

To ensure complete combustion of the fuel in the primary Signup and view all the answers

If the RPM increases, and the airflow increases with 10%, the fuel flow increases with …

more than 10% Signup and view all the answers

What component is part of FADEC?

ECU Signup and view all the answers

What is prevented by the use of a drain point?

The build-up of static charge that might cause a spark Signup and view all the answers

If the ambient temperature increases the (1) ... rotates. This (2) ... the fuel flow.

(1) 3D-cam; (2) decreases Signup and view all the answers