Questions from Thermal Fluid Science

Q: Can the mean effective pressure of an automobile engine in operation be

Can the mean effective pressure of an automobile engine in operation be less than the atmospheric pressure?

Q: Define the effectiveness of a regenerator used in gasturbine cycles.

Define the effectiveness of a regenerator used in gasturbine cycles.

Q: Somebody claims that at very high pressure ratios, the use of

Somebody claims that at very high pressure ratios, the use of regeneration actually decreases the thermal efficiency of a gas-turbine engine. Is there any truth in this claim? Explain.

Q: In an ideal regenerator, is the air leaving the compressor heated

In an ideal regenerator, is the air leaving the compressor heated to the temperature at (a) the turbine inlet, (b) the turbine exit, (c) slightly above the turbine exit?

Q: In 1903, Aegidius Elling of Norway designed and built an 11

In 1903, Aegidius Elling of Norway designed and built an 11-hp gas turbine that used steam injection between the combustion chamber and the turbine to cool the combustion gases to a safe temperature f...

Q: Develop an expression for the thermal efficiency of an ideal Brayton cycle

Develop an expression for the thermal efficiency of an ideal Brayton cycle with an ideal regenerator of effectiveness 100 percent. Use constant specific heats at room temperature.

Q: A gas turbine for an automobile is designed with a regenerator.

A gas turbine for an automobile is designed with a regenerator. Air enters the compressor of this engine at 100 kPa and 30°C. The compressor pressure ratio is 8; the maximum cycle temperatu...

Q: Rework Prob. 9–85 when the compressor isentropic efficiency is

Rework Prob. 9–85 when the compressor isentropic efficiency is 87 percent and the turbine isentropic efficiency is 90 percent. Data from Prob. 9-85: A gas turbine for an automobile...

Q: The specific weight of a system is defined as the weight per

The specific weight of a system is defined as the weight per unit volume (note that this definition violates the normal specific property-naming convention). Is the specific weight an extensive or int...

Q: A gas-turbine engine operates on the ideal Brayton cycle with

A gas-turbine engine operates on the ideal Brayton cycle with regeneration. Now the regenerator is rearranged so that the airstreams of states 2 and 5 enter at one end of the regenerator and streams 3...