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| 微小音速喷嘴临界背压比测试装置 | |
| 引用本文： | 周立媛,李春辉,谢代梁.微小音速喷嘴临界背压比测试装置[J].计量学报,2020,41(1):43-47. |
| 作者姓名： | 周立媛 李春辉 谢代梁 |
| 作者单位： | 1. 中国计量大学 计量测试工程学院, 浙江 杭州 310018 2. 中国计量科学研究院, 北京 100029 |
| 摘 要： | 音速喷嘴工作时的背压比小于临界背压比是实现并保持临界流的关键。现行国际标准建议,对于喉部雷诺数Red小于2×105的音速喷嘴,需保持0.25的临界背压比或进行临界背压比的实际测量。基于此,建立了一套微小音速喷嘴临界背压比测试装置,该装置能够实现喉径为0.3~3mm,流量范围为0.05~5m3/h音速喷嘴临界背压比的测量,测量结果的扩展不确定度为0.56%(k=2)。 |
| 关 键 词： | 计量学 微小音速喷嘴 临界背压比 不确定度 |
| 收稿时间： | 2018-07-11 |
The Test Facility of the Critical Back-pressure Ratio for Small Sonic Nozzle |
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| ZHOU Li-yuan,LI Chun-hui,XIE Dai-liang.The Test Facility of the Critical Back-pressure Ratio for Small Sonic Nozzle[J].Acta Metrologica Sinica,2020,41(1):43-47. | |
| Authors: | ZHOU Li-yuan LI Chun-hui XIE Dai-liang |
| Affiliation: | 1. College of Engineering Measurement, China Jiliang University, Hangzhou, Zhejiang 310018, China 2. National Institute of Metrology, Beijing 100029, China |
| Abstract: | The back pressure ratio of sonic nozzle at work must be lower than critical back-pressure ratio to realize and maintain the critical flow for the sonic nozzle. Therefore, the back pressure ratio of the sonic nozzle when the Reynolds number Red of throat is less than 2×105 should be no bigger than 0.25, or is subjected to make the actual test, which is suggested in ISO 9300. A test facility was built, which can be used to measure the critical back-pressure ratio for the sonic nozzle with throat diameter of 0.3~3mm, while the flow range of sonic nozzle can be 0.05~5m3/h. The expanded uncertainty is 0.56% (k=2). |
| Keywords: | metrology small sonic nozzle critical back-pressure ratio uncertainty |
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