An experimental rig was established to get the performance of high pressure turbine case with thermal deformation control

serving as one of the most important parts of active clearance control (ACC) system. The distribution of temperature and radial deformation was measured to show how the turbine case responded to the temperature variation. In experiments

the coolant mass flow rate of inlet was changed

then the information of temperature and radial deformation was recorded. The rules of those parameters varying in axial and circumferential directions were also studied. It was found in experiments that the temperature of case could be controlled with impingements formed by the staggered jet holes in cooling pipes

which were placed outside the case. Therefore the thermal deformations were also controlled due to those jet impingements. With the increase of coolant mass flow

the response time of thermal deformation decreased significantly at first and then tended to be a certain value. The experimental results showed that the radial thermal deformation of case was substantially uniform. But uneven circumferential distribution of coolant jetting from the pipes can still lead to some non-uniformity of radial thermal deformation in circumferential direction. The maximum relative deviation was about 8.75%. At the same time

the case's temperature in axial direction was also affected by the coolant flow and structural parameters. The maximum relative difference of radial deformation in axial direction as 6.99% was observed in experiments.