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Active clearance control systems for gas turbine engines are disclosed. An example active clearance control system may include a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a ca

Active clearance control systems for gas turbine engines are disclosed. An example active clearance control system may include a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a case; a rigid mounting assembly substantially rigidly coupling the spray tube to the case; and/or a sliding mounting assembly coupling the spray tube to the case while permitting limited relative movement between the spray tube and the case in a direction generally parallel with an engine axis. The sliding mount may be coupled to the case generally axially forward of the rigid mount. A ratio of the stand-off distance to the impingement hole diameter may be less than about 8. A ratio of the arc spacing to the impingement hole diameter may be less than about 15.

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1. An active clearance control system for a gas turbine engine, the active clearance control system comprising: a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a case;wherein an i

1. An active clearance control system for a gas turbine engine, the active clearance control system comprising: a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a case;wherein an individual impingement hole has an impingement hole diameter;wherein the individual impingement hole of the spray tube is spaced apart from the clearance control component by a stand-off distance; andwherein a ratio of the stand-off distance to the impingement hole diameter is less than about 8; further comprising: a rigid mounting assembly substantially rigidly coupling the spray tube to the case and a sliding mounting assembly coupling the spray tube to the case while permitting limited relative movement between the spray tube and the case in a direction generally parallel with an engine axis;wherein the sliding mount is coupled to the case generally axially forward of the rigid mount. 2. The active clearance control system of claim 1, wherein the ratio of the stand-off distance to the impingement hole diameter is less than about 5. 3. The active clearance control system of claim 1, wherein the ratio of the stand-off distance to the impingement hole diameter is less than about 3. 4. The active clearance control system of claim 1, wherein the first individual impingement hole of the spray tube is spaced apart from a circumferentially adjacent second individual impingement hole by an arc spacing; andwherein a ratio of the arc spacing to the impingement hole diameter is less than about 15. 5. The active clearance control system of claim 1, wherein the first individual impingement hole of the spray tube is spaced apart from a circumferentially adjacent second individual impingement hole by an arc spacing; andwherein the ratio of the arc spacing to the impingement hole diameter is between about 2 and about 9. 6. The active clearance control system of claim 1, wherein the first individual impingement hole of the spray tube is spaced apart from a circumferentially adjacent second individual impingement hole by an arc spacing; andwherein the ratio of the arc spacing to the impingement hole diameter is between about 4 and about 7. 7. The active clearance control system of claim 1, wherein a pressure ratio across an individual impingement hole is greater than about 1.3. 8. The active clearance control system of claim 1, wherein a pressure ratio across an individual impingement hole is greater than about 1.4. 9. The active clearance control system of claim 1, wherein a pressure ratio across an individual impingement hole is about 1.5. 10. An active clearance control system for a gas turbine engine, the active clearance control system comprising: a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a case;wherein a first individual impingement hole has an impingement hole diameter; wherein the first individual impingement hole is spaced apart from a circumferentially adjacent second individual impingement hole by an arc spacing; and wherein a ratio of the arc spacing to the impingement hole diameter is less than about 15; further comprising: a rigid mounting assembly substantially rigidly coupling the spray tube to the case and a sliding mounting assembly coupling the spray tube to the case while permitting limited relative movement between the spray tube and the case in a direction generally parallel with an engine axis;wherein the sliding mount is coupled to the case generally axially forward of the rigid mount. 11. The active clearance control system of claim 10, wherein the ratio of the arc spacing to the impingement hole diameter is between about 2 and about 9. 12. The active clearance control system of claim 10, wherein the ratio of the arc spacing to the impingement hole diameter is between about 4 and about 7. 13. The active clearance control system of claim 10, wherein a pressure ratio across an individual impingement hole is greater than about 1.3. 14. The active clearance control system of claim 10, wherein a pressure ratio across an individual impingement hole is greater than about 1.4. 15. The active clearance control system of claim 10, wherein a pressure ratio across an individual impingement hole is about 1.5. 16. An active clearance control system for a gas turbine engine, the active clearance control system comprising: a generally circumferentially mounted spray tube comprising a plurality of impingement holes arranged to impinge thermal control air on a clearance control component of a case;a rigid mounting assembly substantially rigidly coupling the spray tube to the case; anda sliding mounting assembly coupling the spray tube to the case while permitting limited relative movement between the spray tube and the case in a direction generally parallel with an engine axis;wherein the sliding mount is coupled to the case generally axially forward of the rigid mount;wherein a first individual impingement hole has an impingement hole diameter;wherein the first individual impingement hole is spaced apart from the clearance control component by a stand-off distance;wherein the first individual impingement hole is spaced apart from a circumferentially adjacent second individual impingement hole by an arc spacing;wherein a ratio of the stand-off distance to the impingement hole diameter is less than about 8; andwherein a ratio of the arc spacing to the impingement hole diameter is less than about 15. 17. The active clearance control system of claim 16, wherein the ratio of the stand-off distance to the impingement hole diameter is less than about 3. 18. The active clearance control system of claim 16, wherein the ratio of the arc spacing to the impingement hole diameter is between about 4 and about 7. 19. The active clearance control system of claim 16, wherein the spray tube is at least partially constructed of a roll formed channel.