UAV, Propeller and Rotor - Tutorial

Question 1

Name 5 types of hybrid propulsion systems

Answer 1

1. Series Hybrid system
2. Parallel hybrid system
3. Series-parallel hybrid driven train
4. Complex hybrid system
5. Fuel cell hybrid electric system

Question 2

Name 3 types of engines and 2 types of electric motors

Answer 2

Engines:

1. Reciprocating
2. Rotary
3. Brayton cycle

Motors:

1. AC
2. DC

Question 3

List 3 losses neglected ny actuator-disc model

Answer 3

• fluid is incompressible
• disc has no yaw or incidence
• flow is irrigational and isentropic

Question 4

Derive thrust as a function of a, rho, u, A

Answer 4

U2 = U1(1+A)
U3 = u1(1+B)
T = m(u3-u1)
m=rhoAu2

Question 5

Prove propulsive efficiency is only a function of ‘a’

Answer 5

np = Tu/P

Question 6

Draw velocity triangles of blade element analyses. Draw AoA and B

Answer 6

Pic1

Question 7

Derive the torwue force as a function of lift and drag force

Answer 7

deltaF = ///