1-20. (canceled)
21. A threaded connection used in exploration and operation of hydrocarbon wells, comprising:
a first and a second tubular component, the first component comprising a male end comprising a threaded zone disposed on its external peripheral surface, the second component comprising a female end comprising a threaded zone disposed on its internal peripheral surface, the threaded zone of the male end being threaded up into the threaded zone of the female end,
the threaded zones comprising respective male and female threads, the threads comprising a root, a crest, a stabbing flank, and a load flank,
a groove being provided in the load flank of the threaded zone of the female end andor the male end respectively, adjacent to the root, and
a boss being provided which projects axially from the load flank of the threaded zone of the male end andor respectively from the female end adjacent to the crest, the boss comprising a convex surface and a concave surface, the boss being housed in the groove with, in a connected state, a radial clearance subsisting between the concave surface and the groove and an axial clearance subsisting between the end of the boss and the bottom of the groove.
22. A threaded connection according to claim 21, in which the boss is continuous.
23. A threaded connection according to claim 21, in which the boss is discontinuous.
24. A threaded connection according to claim 21, in which the axial clearance between the end of the boss and the bottom of the groove is in a range 0.011 mm to 2 mm in the connected state.
25. A threaded connection according to claim 21, in which the radial clearance between the concave surface of the boss and the groove is in a range 0.005 mm to 2 mm in the connected state.
26. A threaded connection according to claim 16, in which the threads have a constant axial dimension, an axial clearance subsisting in the connected state between the stabbing flanks of the male and female threads.
27. A threaded connection according to claim 26, in which the axial clearance between the stabbing flanks is in a range 0.05 mm to 1 mm in the connected state.
28. A threaded connection according to claim 21, in which the threads have a variable axial dimension.
29. A threaded connection according to claim 21, in which a radial clearance subsists in the connected state between the crests of the male threads and the roots of the female threads andor between the crests of the female threads and the roots of the male threads.
30. A threaded connection according to claim 29, in which the radial clearance between the crest of the threaded zone of the female end and the root of the threaded zone of the male end, andor the radial clearance between the crests of the male threads and the roots of the female threads, is in a range 0.05 mm to 0.5 mm, or is less than 0.2 mm, in the connected state.
31. A threaded connection according to claim 21, in which an interference is present in the connected state between the crests of the male threads and the roots of the female threads or between the crests of the female threads and the roots of the male threads.
32. A threaded connection according to claim 21, in which the stabbing flanks of the threaded zones of the male and female ends comprises a positively inclined rectilinear portion, at an angle in a range 10\xb0 to 35\xb0, or in a range 15\xb0 to 25\xb0.
33. A threaded connection according to claim 21, in which the load flanks of the threaded zones of the male and female ends comprise a negatively inclined rectilinear portion, at an angle in a range 3\xb0 to 15\xb0, or in a range 3\xb0 to 5\xb0.
34. A threaded connection according to claim 21, in which the axial length of the boss is in a range 0.1 mm to 1 mm, or in a range 0.2 mm to 0.4 mm.
35. A threaded connection according to claim 21, in which the axial length of the boss is in a range 50% to 150% of radial height of the boss, or in a range 80% to 120%.
36. A threaded connection according to claim 21, in which the radial height of the boss is in a range 0.1 mm to 1.5 mm, or in a range 0.2 mm to 0.5 mm.
37. A threaded connection according to claim 21, in which the radial height of the boss is in a range 5% to 45% of radial height of the thread, or in a range 10% to 30%.
38. A threaded connection according to claim 21, in which the female and male threaded zones are multiple start threads, or dual-start threads.
39. A threaded connection according to claim 21, in which the distal surface of the male end andor female end is brought into contact in axial abutment against a corresponding abutment surface.
40. A threaded connection according to claim 39, in which the male and female ends each comprises a sealing surface which cooperate with one another by tightening in a metalmetal seal.
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 fuel injection system comprising:
at least one component defining a surface;
an airflow passing along the surface, the airflow including a boundary layer;
at least one fuel nozzle disposed within the component, wherein the at least one fuel nozzle is positioned to inject fuel into the airflow substantially at the boundary layer;
a first turbulence generator positioned at least partially within the boundary layer, wherein the first turbulence generator is located downstream of the fuel nozzle, whereby the first turbulence generator causes disturbances in the boundary layer;
a second turbulence generator positioned at least partially within the boundary layer, wherein the second turbulence generator is located downstream of the fuel nozzle and wherein the second turbulence generator is spaced from the first generator in the direction of the airflow, whereby the second turbulence generator causes disturbances in the boundary layer,
one of the first and second turbulence generators being a protrusion extending from the surface, a passage extending through the protrusion from an upstream inlet with respect to the airflow to a downstream outlet with respect to the airflow, the inlet being in fluid communication with an upstream portion of the boundary layer and the outlet being in fluid communication with a downstream portion of the boundary layer, wherein a portion of airflow in the upstream portion of the boundary layer is received in the inlet and exits from the outlet into the downstream portion of the boundary layer; and
a combustion area receiving the fuel and airflow.
2. The system of claim 1 wherein the at least one component is a turbine engine combustor component.
3. The system of claim 1 further including at least one sensor attached to the surface so as to be substantially proximate to one of the first turbulence generator and the second turbulence generator, wherein the at least one sensor is responsive to temperature changes, whereby the sensor alerts an operator of temperature increases near the respective one of the turbulence generators indicative of flashback or flame holding.
4. The system of claim 3 wherein the at least one sensor is located downstream of the respective one of the turbulence generators.
5. The system of claim 3 wherein the at least one sensor is a thermocouple.
6. The system of claim 1 wherein the fuel nozzle has an outlet end, wherein the outlet end is substantially flush with the surface, whereby the fuel nozzle is located substantially outside of the airflow.
7. A fuel injection system comprising:
at least one component defining a surface;
an airflow passing along the surface, the airflow including a boundary layer;
at least one fuel nozzle disposed within the component, wherein the at least one fuel nozzle is positioned to inject fuel into the airflow substantially at the boundary layer;
a protrusion extending from the surface and into at least a portion of the boundary layer, wherein the protrusion is located downstream of the fuel nozzle, whereby the protrusion generates turbulence in the boundary layer, a passage extending through the protrusion from an upstream inlet with respect to the airflow to a downstream outlet with respect to the airflow, the inlet being in fluid communication with an upstream portion of the boundary layer and the outlet being in fluid communication with a downstream portion of the boundary layer, wherein a portion of airflow in the upstream portion of the boundary layer is received in the inlet and exits from the outlet into the downstream portion of the boundary layer; and
a combustion area downstream of the protrusion, the combustion area receiving the fuel an airflow.
8. The system of claim 7 wherein the at least one passage is angled relative to the surface.
9. The system of claim 1 wherein the other one of the first turbulence generator and the second turbulence generator is a cross-flow of a fluid into the boundary layer.
10. The system of claim 9 wherein the fluid is high pressure air.
11. The system of claim 9 wherein the fluid is introduced at about 90 degrees relative to the surface.
12. The system of claim 9 further including at least one sensor attached to the surface proximate the cross-flow, wherein the at least one sensor is responsive to temperature changes, whereby the sensor alerts an operator of temperature increases near the cross-flow indicative of flashback or flame holding.
13. The system of claim 12 wherein the at least one sensor is located substantially adjacently downstream of the cross-flow.
14. The system of claim 12 wherein the at least one sensor is a thermocouple.
15. The system of claim 9 wherein the cross-flow is introduced by a fluid nozzle disposed within the component, wherein the fluid nozzle has an outlet end, wherein the outlet end is substantially flush with the surface, whereby the fluid nozzle is located substantially outside of the airflow.
16. A method of introducing fuel to a fluid flow upstream of a combustion area comprising:
passing a fluid flow along a surface, wherein the fluid flow includes a boundary layer; injecting a fuel substantially at the boundary layer; and
disturbing the boundary layer downstream of where the fuel is injected and upstream of a combustion area by providing at least one protrusion on the surface, wherein the protrusion extends into the boundary layer such that turbulence is generated in the boundary layer downstream of the protrusion, a passage extending through the protrusion from an upstream inlet with respect to the airflow to a downstream outlet with respect to the fluid flow, the inlet being in fluid communication with an upstream portion of the boundary layer and the outlet being in fluid communication with a downstream portion of the boundary layer, wherein a portion of fluid flow in the upstream portion of the boundary layer is received in the inlet and exits from the outlet into the downstream portion of the boundary layer.