考虑温度影响的PSP动态校准方法及特性研究OA

The dynamic characteristics and temperature effects of fast-response pressure-sensitive paint are the key factors for determining whether it is applicable to unsteady flow fields.This paper proposes a method for dynamic calibration of fast-response PSP(Pressure-Sensitive Paint),establishes a controllable calibration standing wave field through a dynamic calibration system that can adjust the temperature and frequency,and researches on the influence of temperature on pressure sensitivity and frequency response characteristics of the developed PC-PSP(Polymer Ceramic Pressure-Sensitive Paint).Dynamic calibration reflects the PSP characteris-tics more accurately than static calibration.Frequency changes have a significant effect on the pressure sensitivity of PC-PSP,and the influence of temperature on the pressure sensitivity of PC-PSP is not significant,while the temperature sensitivity of PC-PSP cannot be ignored in measure-ment.At the same temperature,the gain decreases and the phase lags behind as the frequency increases.At different temperatures,with the increase of the temperature,the cut-off frequency increases,and the phase lag gradually weakens.The dynamic pressure sensitivity at 20℃and 0.5 kHz is 0.59%/kPa,and at 20℃and 3 kHz is 0.51%/kPa,with the cut-off frequency being 4.8 kHz.Therefore,the performance of the tested PC-PSP is stable and meets the engineering requirements for unsteady flow field pressure measurement tests in low-speed wind tunnels.