作者：陈鑫伟1, 谢代梁1, 徐志鹏1, 徐雅1, 曹松晓1, 刘铁军1, 黄震威2
作者单位：1. 中国计量大学，浙江 杭州 310018;
2. 浙江省流量计量技术重点实验室，浙江 杭州 310018
关键词：音速喷嘴;标准装置;小流量;流出系数
摘要：
音速喷嘴是广泛使用的一种传递标准，它具有重复性好、精度高、结构简单等特点，因此在气体流量测量领域中的地位非凡。而微小喉径的喷嘴研究则随着微小气体流量测量的迅速发展得到越来越广泛的关注，因此在研究微小音速喷嘴的基础上，同时针对气体流量标准装置的便携性进行设计改进。这套标准装置的主要组成部分是两个体积在 10 cm×10 cm×10 cm 之内的腔体容器，实验前需要对装置系统进行气密性检查，整体系统采用质量流量稳定、结构简单可靠的负压法，流出系数作为音速喷嘴研究的流动特性参数。将实验结果与传统的经验公式进行比对，发现误差在 5% 以内，该标准装置可以正常投入使用。该文研究对微小流量标准装置的研制具有一定的参考意义。
Design of portable gas small flow device based on sonic nozzle
CHEN Xinwei1, XIE Dailiang1, XU Zhipeng1, XU Ya1, CAO Songxiao1, LIU Tiejun1, HUANG Zhenwei2
1. China Jiliang University, Hangzhou 310018, China;
2. Key Laboratory of Flow Measurement Technology of Zhejiang Province, Hangzhou 310018, China
Abstract: As the extensively used transfer standards, sonic nozzles have characteristics such as good repeatability, high precision, simple structure etc., sonic nozzles have an extraordinary position in the flow measurement field. The research of sonic nozzles with small throat diameters is gaining more and more attention with the rapid development of low gas flow measurement, the design and improvement of the gas flow standard device are made on the basis of the study of the small sonic nozzles. The main components of this standard device are two cavity containers with a volume of 10 cm×10 cm×10 cm. Before the experiment, it is necessary to check the air-tightness of the device system. The system adopts the negative pressure method with stable mass flow, simple and reliable structure, and uses the discharge coefficient as the flow characteristic parameter for the sonic nozzles study. By comparing the experimental results with the data calculated by formula, it can be seen that the error is below 5%. The standard device is therefore ready for use. This is of certain reference significance to the development of micro flow standard devices.
Keywords: sonic nozzles;standard device;small flow;discharge coefficient
2022, 48(6):111-116 收稿日期: 2021-05-15;收到修改稿日期: 2021-06-29
基金项目: 国家重点研发计划项目（2018YFF0216001）
作者简介: 陈鑫伟（1996-），男，浙江湖州市人，硕士研究生，专业方向为小流量气体检定
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