A dual-flow choked nozzle based precise pressure controller for high-temperature gas systems. (November 2021)

• Record Type: Journal Article
• Authors: Wang, Wujun; Pan, Tianyao; Trevisan, Silvia; Laumert, Björn
• Is Part Of: Measurement. Volume 184(2021)
• Publication Date: 2021-11
• Subjects: Pressure controller -- Choked nozzle -- Gas pressure -- High temperature -- Mass flow controller; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2021.109913
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: A dual-flow choked nozzle based high precision pressure controller is developed. No moving component is exposed to the high-temperature airflow during operation. The precision of the pressure can reach ± 0.005 bar at ambient temperature. A precision value of ± 0.015 bar can be achieved in the range of 797.1–931.5 °C. The response time is within 23.1 s at ambient temperature and 70 s at 907 °C. Abstract: 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.