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Propeller Theory
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Terms in this set (16)
Blade Shank
The portion of a propeller blade that is nearest to the hub
Blade Tip
The portion of a propeller blade that is farthest from the hub
Blade Back
The curved, or cambered, side of the propeller blade
Blade Face
The flat side of a propeller blade
Blade Angle
The acute angle formed by a propeller's plane of rotation and the blade's chord line
Blade Station
A reference position on a propeller blade that is measured from the centre of the hub in inches
Angle of Attack
The angle formed by the chord line of the blade and the relative wind
6 Types of Propellers
- Fixed pitch
- Ground adjustable
- Controllable pitch
- Reversible
- Feathering
- Constant speed
2 Types of Fixed Pitch Propellers
- Cruise propellers
- Takeoff propellers
Pitch
The theoretical distance that a propeller advances longitudinally in one revolution
2 Types of Pitch
- Geometric pitch
- Effective pitch
Geometric Pitch
The distance, in inches, that a propeller would move forward in one revolution if it were moving through a solid medium and didn't encounter any loss of efficiency
Effective Pitch
The actual amount a propeller moves forward in one revolution
Slip
The difference between geometric pitch and effective pitch
6 Forces Acting on a Propeller
- Centrifugal force
- Thrust bending
- Torque bending
- Aerodynamic twisting
- Centrifugal twisting
- Blade vibration
2 Propeller Postitions
- Pusher
- Tractor
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A nuclear reactor fuel element consists of a solid cylindrical pin of radius $r_{1}$ and thermal conductivity $k_{f}$. The fuel pin is in good contact with a cladding material of outer radius $r_{2}$ and thermal conductivity $k_{c}$. Consider steady-state conditions for which uniform heat generation occurs within the fuel at a volumetric rate $\dot{q}$ and the outer surface of the cladding is exposed to a coolant that is characterized by a temperature $T_{\infty}$ and a convection coefficient h. (a) Obtain equations for the temperature distributions $T_{f}(r)$ and $T_{c}(r)$ in the fuel and cladding, respectively. Express your results exclusively in terms of the foregoing variables. (b) Consider a uranium oxide fuel pin for which $k_{f}=2\mathrm{W} / \mathrm{m} \cdot \mathrm{K}$ and $r_{1}=6 \mathrm{mm}$ and cladding for which $k_{c}=25 \mathrm{W} / \mathrm{m} \cdot \mathrm{K}$ and $r_{2}=9 \mathrm{mm}$. If $\dot{q}=2 \times 10^{8}\mathrm{W} / \mathrm{m}^{3}, h=2000 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$ and $T_{\infty}=300 \mathrm{K}$, what is the maximum temperature in the fuel element? (c) Compute and plot the temperature distributio T(r), for values of h=2000, 5000, and 10,000 $\mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$. If the operator wishes to maintain the maintain the 1000 K, can she do so by adjusting the coolant flow and hence the value of h?
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