Gasturbine Performance Deel 2

The purpose of a turbine is to extract (1) … from the gas so it can deliver work to drive the compressor, and possibly the fan or propeller. The specific power supplied by the gas is the largest by (2) … turbine.

Passive Clearance Control (PCC) means cooling the:

The tension in a turbine blade caused by the centrifugal force is the largest at the … the leading- and trailing edge.

The result of fatigue is a crack, occurring as a result of a:

At what fuel-air ratio at the beginning of the combustion chamber will the NOx-production in the entire combustion chamber be the lowest?

What type of combustion chamber is the most suitable for the construction of a compact engine?

Both a … make the use of high-pressure air from the APU at start-up unnecessary.

The following four events take place at the start-up of the engine: (I) turn on fuel flow (II) turn on detonator (III) reaching idle velocity (IV) shut-off the starting engine In what order?

At start-up, the N2-shaft is set in motion by the:

What is the last parameter to increase at the start-up of the engine?

During take-off, approximately 12% more air flows through the engine than during cruise. How much more fuel does that cost according to the graph?

One of the prohibited areas in the fuel metering graph is labelled as ‘Over Temp Area’. What problem does arise in this area?

The heat exchanger heats the fuel to: (I) avoid the formation of ice crystals (II) prevent a shut-down of the pump in the fuel tank

What signal is NOT used by an MEC?

Because the gas flow of a turbofan at the outlet has a lower (1) …, it has at the same TAS, a (2) … propulsive efficiency than a turbojet.

The gas in cylinder number 3 leaves the cylinder. In cylinder number 2 the gas:

No (1) … during an (2) … process.

If we increase the RPM of a reciprocating engine and do not change the fuel-air ratio, then the work done (1) … and the SPECIFIC work done (2) …

Place the engine types below in order of decreasing aircraft velocity.

What thermodynamic processes take place in a IDEAL turbojet?

At what modules we find the highest efficiencies?

When the BPR is decreases the propulsive efficiency will (1) … and the thermal efficiency will (2) …

A drum-type rotor is … compared to a disc-type rotor.

A twist is a change in the … at different blade heights.

During the progress of the start-up of the gas turbine engine on the ground the VBVs (1) … and the VSVs (2) …

In an impulse turbine the degree of reaction is:

A kerosine-air mixture has a stoichiometric ratio. That is, we need (1) … of air for (2) … of kerosine.

If no … are present, then the start-up-cycle can be initiated with the help of a battery.

What is a dry start?

The risk to end up in the stall area of the fuel metering graph is the largest when you (1) … when there is a (2) … ambient temperature.

How many pumps does the fuel pass from tank to fuel nozzle?

What does the ECU of the FADEC NOT control?

What illustration gives the correct sizes and directions of the forces of airflow on the engine and the engine on the airflow?

The propulsive efficiency is the ratio between the power absorbed by the (1) ... and the power delivered by the (2) …

In a reciprocating Diesel engine, energy is released during an ... process.

A Diesel engine has a (1) … efficiency than a gasoline engine. That is partly because the Diesel engine has a much (2) … compression ratio than a gasoline engine.

The (1) … is powered by the (2) …

Which form of energy is included in total enthalpy, but NOT in enthalpy?

In the last part of a high-bypass turbofan, due to the convergence of the outlet the (1) ... of the air (2) ...

What should be the pressure's value at the end of the compressor to achieve the highest possible thermal efficiency?

The critical pressure increases by the ... of the outlet.

(I) By increasing the CPR, the TSFC increases (II) By increasing the Mach number, the TSFC increases

(I) When the BPR is increased, the propulsive efficiency will decrease (II) When the BPR is increased, in general, the thermal efficiency will increase

… gives the most robust connection between the disc and the rotor blade.

The amount of power that is transferred to the air in an axial compressor stage, is smaller than that extracted from the gas in a turbine stage. A factor which does NOT contribute to this, is the smaller ... in the compressor.

What conclusion can you draw if the degree of reaction of a compressor's stage increases?

An axial compressor has significantly more stages than a turbine. This is because ...

The purpose of the VBVs is …

If we compare the stage of a radial compressor with that of an axial compressor, then at the stage of the radial compressor the …

Crack (on a rotor blade) is a result of fatigue, which occurs as a result of a …