1. A turbine nozzle, comprising:
an airfoil;
the airfoil comprising a leading edge and a trailing edge; and
a flow fence;
the flow fence extending from the leading edge to the trailing edge of the airfoil.
2. The turbine nozzle of claim 1, wherein the flow fence extends along a suction side of the airfoil.
3. The turbine nozzle of claim 1, wherein the airfoil extends from a base to a tip and wherein the flow fence is positioned adjacent to the tip.
4. The turbine nozzle of claim 1, wherein the flow fence comprises a substantial V-like shape.
5. The turbine nozzle of claim 1, wherein the flow fence extends in a substantially linear direction.
6. The turbine nozzle of claim 1, wherein the turbine nozzle comprises a last stage nozzle.
7. The turbine nozzle of claim 1, wherein the flow fence comprises a uniform thickness.
8. The turbine nozzle of claim 1, wherein the flow fence comprises a forward leading flow
9. The turbine nozzle of claim 1, further comprising a plurality of flow fences.
10. The turbine nozzle of claim 1, wherein the flow fence comprises a pressure side flow fence.
11. The turbine nozzle of claim 1, wherein the flow fence comprises a middle bulge flow fence.
12. The turbine nozzle of claim 1, wherein the flow fence comprises a rear leading flow fence.
13. The turbine nozzle of claim 1, wherein the flow fence is shaped to reduce flow migration in a flow of hot combustion gases along the airfoil.
14. A turbine, comprising:
a plurality of nozzles; and
a plurality of buckets;
the plurality of buckets comprising an airfoil;
the airfoil comprising a leading edge, a trailing edge, and a flow fence extending therebetween.
15. The turbine of claim 14, wherein the flow fence extends along a suction side of the airfoil.
16. The turbine of claim 14, wherein the flow fence extends along a pressure side of the airfoil.
17. The turbine of claim 14, further comprising a plurality of flow fences.
18. The turbine of claim 14, wherein the airfoil extends from a base to a tip and wherein the flow fence is positioned adjacent to the tip.
19. The turbine of claim 14, wherein the flow fence is shaped to reduce flow migration in a flow of hot combustion gases along the airfoil.
20. A turbine nozzle airfoil, comprising:
a leading edge;
a trailing edge,
a pressure side;
a suction side; and
a flow fence extending from the leading edge to the trailing edge along the suction side.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device comprising:
a module comprising an output operable to provide a first signal indicative of a load current or a load voltage associated with a current consuming device;
first circuitry comprising:
an input operable to receive a second signal indicative of a variation of a load impedance associated with the current consuming device during an \u201cON\u201d phase and an \u201cOFF\u201d phase of the current consuming device and
an output operable to provide a over-load limit signal based on the second load signal; and
a comparator comprising a first input coupled to the output of the module, a second input coupled to the output of the first circuitry, and an output coupled to a current driver operable to provide a current to the current consuming device based on a comparison of the first load signal to the over-load limit signal.
2. The device of claim 1, further comprising second circuitry comprising an input to receive the first signal and an output coupled to the input of the first circuitry, the second circuitry operable to determine the load impedance based upon the first signal provide the second signal based on the first signal, and to provide the signal indicative of the variation of the load impedance at its output.
3. The device of claim 2, wherein the first circuitry comprises a digital-to-analogue converter.
4. The device of claim 3, wherein the second circuitry comprises:
a first frequency adjustable oscillator operable to provide an output signal having a pulse-width based on an amount of time the current consuming device is in the \u201cOFF\u201d phase; and
a counter comprising a first input coupled to the output of the first frequency adjustable oscillator and an output coupled to the input of the digital-to-analogue converter.
5. The device of claim 4, wherein the second circuitry further comprising:
a second frequency adjustable oscillator comprising an input coupled to the output of the module and an output operable to provide an output signal having a pulse-width based on an amount of time the current consuming device is in the \u201cON\u201d phase; and
wherein the counter comprises a second input coupled to the output of the second frequency adjustable oscillator.
6. The device of claim 2, wherein the output of the comparator is operable to control a lamp driver signal for driving a light emitting current consuming device.
7. The device of claim 6, wherein the second circuitry is operable to determine the load impedance based on a temperature of the light emitting current consuming device.
8. The device of claim 6, wherein the second circuitry is operable to determine the load impedance based on a variation in temperature of the light emitting current consuming device.
9. The device of claim 6, wherein the second circuitry comprises an integrator comprising an output operable to provide a signal indicative of a bulb filament temperature, the second circuitry operable to adjust the second signal based on the output of the integrator.
10. The device of claim 9, wherein the integrator is a digital integrator.
11. The device of claim 2, wherein the output of the comparator is operable to control a motor driver signal for driving a light emitting current consuming device.
12. The device of claim 2, wherein the second circuitry is operable to adjust the second signal by continuously monitoring the load impedance associated with the current consuming device.
13. The device of claim 2, wherein the second circuitry is operable to adjust the second signal by intermittently monitoring the load impedance associated with the current consuming device.
14. The device of claim 1, wherein the first signal is indicative of a load current.
15. The device of claim 1, wherein the first signal is indicative of a load voltage.