This paper investigates the pressure sensitivity of a temperature-sensitive paint (TSP) which uses a clear coat as binder and the Ru(dpp) as luminophore, and then discusses its effect on heat flux determination. Systematic static calibrations of three TSP samples with different thicknesses (7.5 μm, 10.3 μm and 13.1 μm) are carried out in a temperature range of 298 K to 373 K and a pressure range of 3.8 kPa to 15.2 kPa. Besides, dynamic pressure response calibrations are performed from 298 K to 373 K. The static calibration results show a significant growth in the pressure sensitivity as the temperature increases. For example, the pressure sensitivity of the 10.3 μm thick TSP at 3.8 kPa grows from 0.086% kPa⁻¹ to 0.412% kPa⁻¹ as the temperature rises from 298 K to 373 K. The dynamic calibration results show that the pressure response time is in the order of seconds, which decreases significantly with both the temperature and the paint thickness. For example, the pressure response time of the 10.3 μm thick TSP decreases from 11.55 s to 0.68 s as the temperature increases from 298 K to 373 K. The calibration results suggest that the pressure sensitivity of TSP would lead to noticeable temperature and heat flux errors in high-speed, long-duration wind tunnel tests. This pressure-induced effect is evaluated for three TSP samples by the simulations with varying local pressure and heat flux. The results show that the heat flux error increases as the paint thickness reduces because of faster pressure response. The error increases with the local pressure as expected, but it shows a negative correlation to the local heat flux.

本文研究了使用透明涂层作为粘合剂和 Ru(dpp) 作为发光体的温敏涂料 (TSP) 的压力敏感性，然后讨论了其对热通量测定的影响。在 298 K 至 373 K 的温度范围和 3.8 kPa 至 15.2 kPa 的压力范围内对具有不同厚度（7.5 μm、10.3 μm 和 13.1 μm）的三个 TSP 样品进行系统静态校准。此外，动态压力响应校准是在 298 K 到 373 K 之间进行的。静态校准结果显示，随着温度的升高，压力灵敏度显着增加。例如，10.3 μm 厚 TSP 在 3.8 kPa 下的压力灵敏度从 0.086% kPa ^-1增长到 0.412% kPa ^-1随着温度从 298 K 上升到 373 K。动态标定结果表明，压力响应时间在秒级，随着温度和油漆厚度的增加而显着下降。例如，随着温度从 298 K 增加到 373 K，10.3 μm 厚 TSP 的压力响应时间从 11.55 s 减少到 0.68 s。校准结果表明 TSP 的压力敏感性会导致明显的温度和热通量误差在高速、长时间的风洞试验中。通过具有不同局部压力和热通量的模拟，对三个 TSP 样品评估了这种压力诱导效应。结果表明，由于更快的压力响应，热通量误差随着涂料厚度的减小而增加。正如预期的那样，误差随着局部压力的增加而增加，