| 苏松飞,刘鹏展,胡俊辉.超声波空气污染物颗粒采样器的新结构及其特性研究*[J].,2018,37(1):114-120 |
| 超声波空气污染物颗粒采样器的新结构及其特性研究* |
| New structure of the ultrasonic air pollutant particle sampler and its characteristics |
| 投稿时间：2017-10-23 修订日期：2017-12-25 |
| 中文摘要: |
| 超声波空气污染物颗粒采样器具有可采集低浓度颗粒污染物、采样速度快、重复性好、结构简单、易分析被采集物以及不破坏污染物成分等优点。为了进一步提高其采样效率,本文提出了一种超声波空气污染物颗粒采样器的新结构。该采样器由超声换能器,被粘接在换能器声辐射面上的圆形声辐射板以及与声辐射板平行的采样板组成。该采样器利用声辐射力和声学流场驱动空气中的污染物颗粒快速聚集到采样板上。样机测试表明：该结构在空气污染物颗粒初始浓度为4mg/L以及辐射板中心位置的振动速度为0.29m/s时,对烟雾中PM2.5和PM2.5-10颗粒的采样效率为16.3mg/m2.min.W。与不采用高阶弯曲振动圆形声辐射板的结构相比,其采样效率增加了110%. |
| 英文摘要: |
| Ultrasonic sampler for aerial pollution particles (USAPP) has the merits such as being capable of sampling low-concentration particulate pollutants, high sampling speed, good repeatability, simple structure, easiness to analyze the samples and little damage to the sampled particles. In this work, we propose a new structure to enhance its sampling efficiency. In the structure, a circular radiation plate, which is parallel to the circular sampling plate, is attached at the center of the radiation face of the ultrasonic transducer. During the operation at the resonance, the circular plate vibrates in the higher order flexural mode. Our experiments show that the ultrasonic sampler with the new structure has a sampling capability of 16.3 mg/m2.min.W for PM2.5 and PM2.5-10 when the initial smog concentration is 4mg/L, and the vibration velocity at the center of radiation plate is 0.29m/s. Its sampling capability is 110% higher than the one which does not use the circular radiation plate. Also, the effects of the driving voltage (resonance) and sound field thickness on the sampled particle mass are experimentally clarified. |
| DOI：10.11684/j.issn.1000-310X.2018.01.017 |
| 中文关键词: 超声波,采样器, 污染物颗粒,声辐射力 |
| 英文关键词: Ultrasound, Sampler, Pollutant particles, Acoustic radiation force |
| 基金项目:国家重点基础研究发展计划项目 (973 计划, 2015CB057501), 江苏省普通高校研究生科研创新计划项目 (KYLX16_0331), 江苏省研 究生科研与实践创新计划项目 (KYCX17_0237), 中央高校基本科研业务费专项资金资助 |
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