| 恒定微压下微小流量的非定常流测量方法 |
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| 引用本文： | 魏列江,冀宏,李少年,强彦,魏中英.恒定微压下微小流量的非定常流测量方法[J].机械工程学报,2009,45(5). |
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| 作者姓名： | 魏列江 冀宏 李少年 强彦 魏中英 |
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| 作者单位： | 1. 兰州理工大学流体动力与控制学院,兰州,730050
2. 兰州兰飞医疗器械有限公司,兰州,730070 |
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| 基金项目： | 国家自然科学基金，甘肃省自然科学基金 |
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| 摘 要： | 为了精确测量微小流道中的微小流量,提出了用非定常流等效定常流进行恒定微压下微小流量测量的新方法,推导出了非定常流等效定常流进行微小流量测量时的水头适用条件.利用流体力学拉格朗日积分建立非定常流的非线性微分方程,用Matlab软件对非线性微分方程进行了数值解析,得出该测量方法的理论误差,数值结果表明在不考虑测试管段沿程阻力的条件下,被测试件过流面积与测试管断面积比值越小,非定常流与定常流条件下的测量结果差别越小.依据所提出的测量方法建立微小流量非定常流测量装置,实测结果与理论计算结果吻合良好.计算和试验表明:在满足水头适用条件且被测试件过流面积与测试管断面积比值小于3.422%时,非定常流测量方法测试精度可保证在2.27%以内.
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| 关 键 词： | 微小流量 微压 非定常流 测量方法 精度 |
Non-steady Flow Method for Measuring the Micro Flow at Constant Micropressure |
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| WEI Liejiang,JI Hong,LI Shaonian,QIANG Yan,WEI Zhongying.Non-steady Flow Method for Measuring the Micro Flow at Constant Micropressure[J].Chinese Journal of Mechanical Engineering,2009,45(5). |
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| Authors: | WEI Liejiang JI Hong LI Shaonian QIANG Yan WEI Zhongying |
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| Affiliation: | 1. College of Flow Power and Control Engineering;Lanzhou University of Technology;Lanzhou 730050;2. Lanzhou Lanfei Medical Instrument Co. Ltd.;Lanzhou 730070 |
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| Abstract: | In order to measure the micro flow in micro channel precisely and easily, a new measuring method based on the idea of utilizing non-steady flow state to be equivalent to steady flow state used in traditional measurement is proposed. The applicable condition of pressure head for the new measuring method is derived. Based on Lagrange integral principle in fluid dynamics, a mathematic model in form of non-linear differential equation is built and analyzed numerically by using MATLAB software, so the theoretica... |
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| Keywords: | Micro flow Micropressrue Non-steady flow Measurement method Precision |
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