Heat Exchangers in Aerospace Engineering

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What is the purpose of installing a recuperator in a gas turbine system?

To increase the temperature of the compressed air leaving the compressor

To preheat the air leaving the compressor by transferring waste heat (correct)

To reduce the waste heat in the exhaust

To cool down the combustion chamber

What is a key factor that enables a gas turbine system to benefit from a recuperator?

A high level of Tt5 compared to Tt3 (correct)

A low level of Tt5 compared to Tt3

Equal temperatures at Tt5 and Tt3

The absence of a combustion chamber

What is the primary function of a counter-flow heat exchanger in a gas turbine system?

To lower the temperature of the compressed air leaving the compressor

To transfer waste heat to the compressed air (correct)

To cool down the waste gas before leaving the system

To increase the waste heat in the exhaust

Why can't the outlet temperature of the 'cold' gas in a heat exchanger reach the inlet temperature of the waste gas?

Because of a lack of temperature difference between the two gases Signup and view all the answers

In what way does installing a recuperator impact the workload of the combustion chamber in a gas turbine system?

Decreases the workload by reducing energy contribution Signup and view all the answers

What is a critical requirement for effective heat transfer in a heat exchanger within a gas turbine system?

A significant temperature difference between hot and cold gases Signup and view all the answers

What effect does using an inter-cooler have on the work input required for compression in gas turbines?

Decreases the work input Signup and view all the answers

How does the amount of heat transfer achievable in a recuperator change with decreasing compressor delivery air temperature?

Increases Signup and view all the answers

What is the thermal efficiency when using a recuperator without a heat exchanger and with a total pressure ratio of 40?

50% Signup and view all the answers

How does the use of a recuperator affect the thermal efficiency of a cycle compared to when no heat exchanger is used?

Increases the thermal efficiency Signup and view all the answers

In gas turbines, what impact does the total pressure ratio have on the thermal efficiency when using a recuperator?

Higher total pressure ratio leads to higher thermal efficiency Signup and view all the answers

What component can be used in gas turbines to reduce the work input required for compression?

Inter-cooler Signup and view all the answers

What happens to the total enthalpy as the flow passes through the diffuser?

It remains constant at a higher level Signup and view all the answers

In the context of turbomachinery, what is the Ram effect?

The effect of engine's forward speed on total enthalpy Signup and view all the answers

Which component is responsible for increasing the total enthalpy and total pressure in the system?

Compressor Signup and view all the answers

What is the role of the diffuser in the turbomachinery system?

To decelerate the flow at constant total enthalpy Signup and view all the answers

How does forward speed of the aircraft affect the total enthalpy according to the text?

It raises the total enthalpy by adding kinematic term Signup and view all the answers

What component adds to static quantities due to stagnation in the engine?

Compressor work input Signup and view all the answers

Heat Exchangers in Aerospace Engineering

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