1. A compressor discharge can comprising:
a transition piece; and
a flow redirector located about the transition piece defining an airflow space therebetween, the flow redirector configured to reduce recirculation of flow in the airflow space.
2. The compressor discharge can of claim 1, wherein an impingement sleeve is located between the transition piece and the flow redirector.
3. The compressor discharge can of claim 2, wherein the flow redirector is attached to the impingement sleeve.
4. The compressor discharge can of claim 1, wherein an offset dimension is consistent between the transition piece and a proximal surface of the flow redirector.
5. The compressor discharge can of claim 1, wherein the flow redirector is located radially outwardly relative to the transition piece with respect to an axis of a combustor.
6. The compressor discharge can of claim 1, wherein the flow redirector is configured to increase flow velocity in the airflow space.
7. The compressor discharge can of claim 1, wherein flow in the airflow space flows across a surface of the transition piece, wherein an average flow velocity across the surface is greater than an average flow velocity across an antipodal surface of the transition piece.
8. The compressor discharge can of claim 1, wherein the flow redirector includes at least one opening.
9. The compressor discharge can of claim 1, wherein the flow redirector is attached to a wall of the compressor discharge can.
10. The compressor discharge can of claim 1, wherein the flow redirector is attached to the transition piece.
11. The compressor discharge can of claim 1, wherein the flow redirector is attached to a sleeve of an airflow outlet.
12. The compressor discharge can of claim 1, where the flow redirector is positioned about a hot zone of the transition piece.
13. A compressor discharge can comprising:
a transition piece; and
a flow redirector located about the transition piece, an airflow space being located between the flow redirector and the transition piece, the flow redirector configured to increase flow velocity in the airflow space.
14. The compressor discharge can of claim 13, further comprising an impingement sleeve located between the transition piece and the flow redirector.
15. The compressor discharge can of claim 14, wherein the flow redirector is attached to the impingement sleeve.
16. The compressor discharge can of claim 13, wherein the flow redirector is attached to a wall of the compressor discharge can.
17. A method for cooling a transition piece comprising:
increasing velocity of a fluid flowing across a surface of a transition piece with a flow redirector; and
reducing recirculation of flow of the fluid across the surface of the transition piece with the flow redirector.
18. The method for cooling a transition piece of claim 17, further comprising moving a recirculation zone to a position adjacent to an antipodal surface of the flow redirector, the antipodal surface being antipodal to a surface facing the transition piece.
19. The method for cooling a transition piece of claim 17, further comprising increasing heat transfer from the surface of the transition piece to fluid flowing thereover.
20. The method for cooling a transition piece of claim 17, further comprising reducing a flow velocity gradient of the fluid flowing adjacent an outer wall of the transition piece.
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 specimen observing method, comprising the steps of:
irradiating a specimen supplied with a negative voltage with an electron beam to generate secondary electrons from the specimen,
forming a negative potential field such that the secondary electrons are retarded,
deflecting and detecting the retarded secondary electrons to obtain a specimen image on the basis of the retarded secondary electrons, and
adjusting the negative voltage so as to cancel charge-up of the specimen.
2. A specimen observing method according to claim 1, wherein the step of adjusting the negative voltage is so performed that the specimen image has a given image contrast.
3. A specimen observing method according to claim 1, wherein the step of adjusting the voltage is performed while monitoring an output of a secondary electron detector detecting the generated secondary electrons so that the output shows a maximum.
4. A specimen observing method, comprising the steps of:
irradiating a specimen supplied with a negative voltage with an electron beam to generate secondary electrons from the specimen,
forming a negative potential field such that the secondary electrons are retarded,
deflecting and detecting the retarded secondary electrons to obtain a specimen image on the basis of the retarded secondary electrons, and
adjusting the negative voltage while monitoring an output of a secondary electron detector detecting the secondary electrons to determine a value of the negative voltage at which the output has a maximum value.
5. A scanning electron microscope which comprises:
an electron source emitting a primary electron beam,
a focusing lens focusing the primary electron beam,
a deflector deflecting the primary electron beam to irradiate a specimen with the focused primary electron beam so as to generate secondary electrons from the specimen;
a detector detecting the secondary electrons;
a negative voltage supplying source supplying the specimen and the deflector with a negative voltage such that the secondary electrons are retarded, and
a controller adjusting the negative voltage to determine a value thereof at which the output shows a maximum.
6. A scanning electron microscope according to claim 5, wherein the secondary electron detector comprises a secondary electron multiplier and the controller adjusts the negative voltage while monitoring an output of the secondary electron multiplier.