18 Questions
What is the purpose of installing a recuperator in a gas turbine system?
To preheat the air leaving the compressor by transferring waste heat
What is a key factor that enables a gas turbine system to benefit from a recuperator?
A high level of Tt5 compared to Tt3
What is the primary function of a counter-flow heat exchanger in a gas turbine system?
To transfer waste heat to the compressed air
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
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
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
What effect does using an inter-cooler have on the work input required for compression in gas turbines?
Decreases the work input
How does the amount of heat transfer achievable in a recuperator change with decreasing compressor delivery air temperature?
Increases
What is the thermal efficiency when using a recuperator without a heat exchanger and with a total pressure ratio of 40?
50%
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
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
What component can be used in gas turbines to reduce the work input required for compression?
Inter-cooler
What happens to the total enthalpy as the flow passes through the diffuser?
It remains constant at a higher level
In the context of turbomachinery, what is the Ram effect?
The effect of engine's forward speed on total enthalpy
Which component is responsible for increasing the total enthalpy and total pressure in the system?
Compressor
What is the role of the diffuser in the turbomachinery system?
To decelerate the flow at constant total enthalpy
How does forward speed of the aircraft affect the total enthalpy according to the text?
It raises the total enthalpy by adding kinematic term
What component adds to static quantities due to stagnation in the engine?
Compressor work input
Learn about the concept of heat exchangers, specifically recuperators, and how they improve efficiency in aerospace engineering. Explore how waste heat in exhaust can be transferred to compressed air to preheat it, reducing the energy needed from the combustion chamber.
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