5 Consider a gas turbine If the isentropic efficiency of the

5. Consider a gas turbine. If the isentropic efficiency of the turbine is reduced, how will the properties at the exit be affected? (Write “increase”, “decrease”, or “remain the same” in each of the blanks below.)

a) The pressure will ____________________________.

b) The temperature will ____________________________.

c) The specific volume will ____________________________.

d) The enthalpy will ____________________________.

Solution

If the isentropic efficiency of the turbine is reduced.

(d)

The enthalpy difference of the turbine is decreased.

Thus the final enthalpy of the fluid is increased.

(a)

The pressure of the fluid remains same.

(b)

The temperature of the fluid is increased.

(c)

The specific volume of the fluid also increases.