A novel dual-flow choked nozzle based pressure controller is developed to achieve high-precision pressure control. The primary air flow is mainly used for offering the required mass flow to the test section, and the secondary air flow is used for regulating the total mass flow through the choked nozzle to achieve required pressure levels. The test results show that the precision of the stabilization of the pressure can reach ± 0.005 bar for cold-state environments with air flow at ambient temperature, and ± 0.015 bar for hot-state environments with air flow temperature in the range of 797.1–931.5 °C. Besides, this pressure controller has fast response. A new pressure steady state can be reached within 23.1 s for air flow at ambient temperature and 70 s for high-temperature scenario. Since no moving component exposed to the high-temperature air flow, it is very suitable for the pressurized test rigs with extremely high-temperature gas flow.

开发了一种基于双流节流喷嘴的新型压力控制器，以实现高精度压力控制。一次空气流量主要用于向测试段提供所需的质量流量，二次空气流量用于调节通过节流喷嘴的总质量流量，以达到所需的压力水平。测试结果表明，常温下空气流动的冷态环境压力稳定精度可达±0.005 bar，空气流动温度在797.1-931.5范围内的热态环境压力稳定精度可达±0.015 bar ℃。此外，该压力控制器响应速度快。环境温度下的气流可在 23.1 s 内达到新的压力稳态，高温情况下可在 70 s 内达到新的压力稳态。