Influence of wall temperature distribution on discharge coefficient of sonic nozzle

Peijuan Cao, Yuhan Xiang, Chunhui Li, Han Zhang

Abstract

To investigate the influence of complex body temperature distribution, especially the temperature drop near the throat on the discharge coefficient Cd of sonic nozzles, an adiabatic sonic nozzle with the throat of 2 mm and temperature acquisition systems including insulation sleeve with 15 mm Polytetrafluoroethylene (PTFE) and 5mm pearl cotton, multichannel data collector, three T type thermocouples, were established. Moreover, this system can be directly installed on the 100 L pVTt facility with or without insulation sleeve at National Institute of Metrology of China (NIM), to obtain these characteristics of body temperature distribution near the throat and Cd for sonic nozzle. Then, the influence of temperature distribution at throat on the Cd was qualitatively analyzed.

Keywords

Sonic nozzles; Thermal effects; Temperature distribution; Thermocouple

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IMEKO-TC9-2019-095.pdf

DOI

10.21014/tc9-2022.095

IMEKO TC

TC9 - Flow Measurement

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