Fan blade or vane with improved bird impact capability
A gas turbine engine is provided and includes a first fan blade including a suction surface, a second fan blade comprising a pressure surface and neighboring the first fan blade and a throat region interposed between the suction surface of the first fan blade and the pressure surface of the second fan blade. The throat region includes a passage throat located at a minimum distance between the pressure and suction surfaces. The first and second fan blades are configured such that a pre-compression region is defined in the throat region ahead of the passage throat. Each of the first and second fan blades includes a mean camber line defining a flattened suction surface.
1. A fan blade of a gas turbine engine, comprising:
a body having an airfoil shape and exhibiting:
a range of thickness-over-chord (T/B) values of 0.0761 at 20% span to 0.0465 at 50% span,
an average location of max thickness (LMT) of 0.3778 at 0-20% span, and
an average of leading edge (LE) thickness at 10% chord-over-total chord of 0.0494 at 0-20% span.
2. The fan blade according to claim 1 , wherein:
in a 0%-20% span, the airfoil shape exhibits an average T/B of 0.0887 (−8% to +8%),
in a 20%-50% span, the airfoil shape exhibits an average T/B of 0.0596 (−8% to +8%),
in a 50%-90% span, the airfoil shape exhibits an average T/B of 0.0394 (−8% to +8%), and
in a 90% to 100% span, the airfoil shape exhibits an average T/B of 0.0296 (−8% to +8%).
3. The fan blade according to claim 1 , wherein:
in a 0%-20% span, the airfoil shape exhibits an average LMT of 0.378 (−8% to +8%),
in a 20%-50% span, the airfoil shape exhibits an average LMT of 0.406 (−8% to +8%),
in a 50%-90% span, the airfoil shape exhibits an average LMT of 0.478 (−8% to +8%), and
in a 90% to 100% span, the airfoil shape exhibits an average LMT of 0.587 (−8% to +8%).
4. The fan blade according to claim 1 , wherein:
in a 0%-20% span, the airfoil shape exhibits an average LE thickness at 10% chord-over-total chord of 0.0494 (−12% to +12%),
in a 20%-50% span, the airfoil shape exhibits an average LE thickness at 10% chord-over-total chord of 0.0292 (−5% to +10%),
in a 50%-90% span, the airfoil shape exhibits an average LE thickness at 10% chord-over-total chord of 0.0198 (−5% to +10%), and
in a 90% to 100% span, the airfoil shape exhibits an average LE thickness at 10% chord-over-total chord of 0.0135 (−8% to +8%).
5. The fan blade according to claim 1 , wherein the airfoil shape exhibits an increasing radial LE angle from a 25% (−5% to +5%) span to a 75% (−5% to +5%) span.
6. The fan blade according to claim 5 , wherein the airfoil shape exhibits an inflection in the radial LE angle at the 75% (−5% to +5%) span above which the radial LE angle decreases.
7. The fan blade according to claim 1 , wherein the airfoil shape exhibits an increasing radial LE angle from a 35% (−5% to +5%) span to a 85% (−5% to +5%) span.
8. The fan blade according to claim 7 , wherein the airfoil shape exhibits an inflection in the radial LE angle at the 85% (−5% to +5%) span above which the radial LE angle decreases.
9. The fan blade according to claim 1 , wherein the airfoil shape exhibits a thickness-to-chord value at a 10% chord location at 0% LE span of 0.0688 (−15% to +15%), which tapers to 0.0442 (−12% to +12%) at 11% LE span.
10. The fan blade according to claim 1 , wherein the airfoil shape exhibits a chord distribution that has an inflection point between 50% and 70% span, the inflection point having a magnitude 1.45-1.55 times a magnitude of the chord at 0% span, and 1-1.1 times a magnitude of the chord at 100% span.