Influence of diffuser angle on discharge coefficient of sonic nozzles for flow-rate measurements

被引：19

作者：

Li, C. H. ^{[1
]}

Peng, X. F. ^{[2
]}

Wang, C. ^{[1
]}

机构：

[1] NIM, Flow Lab, Heat Div, Beijing 100013, Peoples R China

[2] Tsinghua Univ, Dept Thermal Engn, Lab Phase Change & Interfacial Transport Phenomen, Beijing 100084, Peoples R China

来源：

FLOW MEASUREMENT AND INSTRUMENTATION | 2010年 / 21卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Sonic nozzle; Discharge coefficient; Effective diameter; Diffuser angle;

D O I：

10.1016/j.flowmeasinst.2010.09.003

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A series of numerical simulations were conducted to investigate the influence of diffuser angle on discharge coefficient of sonic nozzles for gas flow-rate measurements satisfied with the regulation of ISO-9300 and operated at atmospheric condition with throat diameter from 0.15 to 5 mm and 2.0 x 10(3) <= Re(d) <= 6.6 x 10(4). When throat diameters are larger than 1 mm, the discharge coefficients are almost the same for nozzles with different diffuser angles, while they increase with increasing diffuser angle for smaller nozzles. A concept or effective critical flow was introduced to explore the effect of diffuser angle on discharge coefficient. Using a new parameter, effective throat diameter or deviation of effective throat diameter from the minimum effective diameter delta, a very good description is derived to discuss the effect of diffuser angle on the discharge coefficient. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：531 / 537

页数：7

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