Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Derive the equation below
ah ap
ax 12μ ax,
+(
ah
ap
ay 12μ ay
Where P P (x, y) is the oil film pressure.
1..ah
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Monthly exam
13
2021-2022
Power plant
Time: 1.5 Hrs
Q1. A The gas-turbine cycle shown in Fig. is used as an automotive engine. In the first
turbine, the gas expands to pressure Ps, just low enough for this turbine to drive the
compressor. The gas is then expanded through the second turbine connected to the
drive wheels. The data for the engine are shown in the figure, and assume that all
processes are ideal. Determine the intermediate pressure Ps, the net specific work
output of the engine, and the mass flow rate through the engine. Find also the air
temperature entering the burner T3 and the thermal efficiency of the engine.
Exhaust
Air
intake
Φ
www
Regenerator
www
Bumer
Compressor
Turbine
Power
turbine
et 150 kW
Wompressor
P₁ = 100 kPa
T₁ = 300 K
PP₁ =60
P-100 kPa
T₁ = 1600 K
Q2. On the basis of a cold air-standard analysis, show that the thermal efficiency of an
ideal regenerative gas turbine can be expressed as
77 = 1-
where
- () ()
гp is the compressor pressure ratio, and T₁ and…
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