Experiment of High Pressure Turbine Case Based on Active Clearance Control System

In order to obtain the performance of one active clearance control (ACC) system, the experimental rig of model high pressure turbine case was designed and established. According to the analysis of the thermal environment of active clearance control system and error analysis of the test scheme, a temperature-control method was used to simulate the heat source, a verification of test data was presented by repeatability experiments. The tests under different heating temperature with/without the ACC system were carried out, the corresponding temperature field and displacement field of the case were measured. The experimental results showed that in the case the ACC did not work, the thermal deformation of the case in the radial direction was at a near-liner trend along with the growth of temperature, the thermal deformation of case increased about 3.5μm when the temperature grew 1℃; in the case the ACC worked, the temperature field along the circumferential direction was in a 'peak' shape distribution, also, the circumferential deformation difference grew bigger, the maximum is 335μm in this paper, an 'IOI-like' distribution which represented wall flow area and spring flow area was observed. Based on the analysis of the test data under different conditions, it is concluded that the working efficiency of the ACC system is negatively correlated with the thermal deformation of the casing. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.