Powerplants Case

Exercise 1 Calculate the unknown pressures, temperatures as well as the power along the length of the engine shown below. Given P2=1bar, T2=288K, P3=45bar & T4=1700K. Assume a value of 1000J/KgK for the specific heat at constant pressure.

Exercise 2 How are the characteristics of the engine (from exercise 1) affected when the inlet temperature is lowered by 20K?

Exercise 3 Calculate the unknown pressures, temperatures as well as the power along the length of the engine shown below. Given P2=1bar, T2=268K, P3=35bar & T4=1700K. Assume a value of 1000J/KgK for the specific heat at constant pressure. Compare the results with those obtained in exercise 1 and comment on the effect of the pressure ratio on the performance of the engine

Exercise 1 In general, what is the definition of Aerodynamics?

Exercise 2 What is the difference between Aerodynamics and Fluid Mechanics in terms of their study?

Exercise 3 Fluids can be divided into two types. Name these two types and explain what causes them to behave in such a manner.

Exercise 4 What is the main difference between a gas and a liquid? (From an aerodynamic view-point)

a) The wing of an aircraft acts essentially as a cantilever beam subjected to a point force resulting from the engine mass and a force distribution resulting from the mass of the wing structure. The following schematic represents the section of a wing.

Using the information supplied in the diagram,

i) Calculate the shear force and bending moment at the root of the wing section?

[Ans V0=47088N, M0=-167751 Nm]

ii) Draw the shear force and bending moment diagram along the span of the wing?

The front spar of an aircraft wing is designed to resist the bending moments exerted by the wing mass and aerodynamic forces during flight. The front spar is formed from an 'I beam' and the dimensions of the cross-section are illustrated below.

i) What is the moment of inertia of the I beam?

Assuming that the beam is subjected to a pure positive bending moment of 3350Nm

[Ans IBeam = 1.2833X10-7 m4]

ii) What is the maximum tensile stress within the beam and where is it located?