• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Flow Measurement and Instrumentation >Improvement of the constant temperature anemometer and measurement of energy spectra in a turbulent jet
【24h】

Improvement of the constant temperature anemometer and measurement of energy spectra in a turbulent jet

机译：湍流射流恒温风速计的改进和能谱的测量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper presents a rearranged electrical circuit for a constant temperature anemometer (CTA), along with details of calibration results and velocity measurement results for a plane jet and square jet that were obtained by using the rearranged CTA. In this rearranged CTA, the ratio of the electrical resistance of the Wheatstone bridge was set at one, and the feedback circuit used two operational amplifiers whose gain-bandwidth product and slew rate were 110 MHz and 20V/μs, respectively. The results of a frequency response test showed that the roll-off frequency of the rearranged CTA was 20 kHz for a 5-μm hot-wire and 40 kHz for a 3-μm hot-wire, given a free stream flow velocity of 20 m/s; those of a basic CTA were 5 kHz and 6 kHz, respectively. It was also found that the energy spectra measured by the rearranged CTA yielded a power spectrum that agreed with the profile derived numerically from the Lagrangian direct-interaction approximation (LDIA) theory in the range of non-dimensional wave numbers smaller than 0.5. These results indicate that the rearranged CTA could be used for more accurate investigations of fine-scale structures in turbulent flows. Further, the profile obtained by the LDIA theory was valid and useful for discussing the turbulent flows.
机译：本文介绍了用于恒温风速计（CTA）的重新布置的电路，以及通过使用重新布置的CTA获得的平面射流和方形射流的校准结果和速度测量结果的详细信息。在重新排列的CTA中，惠斯通电桥的电阻比设置为1，反馈电路使用两个运算放大器，其增益带宽积和压摆率分别为110 MHz和20V /μs。频率响应测试的结果表明，在自由流流速为20 m的情况下，重新排列的CTA的滚降频率对于5μm热线为20 kHz，对于3μm热线为40 kHz。 / s;基本CTA的频率分别为5 kHz和6 kHz。还发现，通过重新排列的CTA测得的能谱产生的功率谱与在小于0.5的无量纲波数范围内从拉格朗日直接相互作用逼近（LDIA）理论数值导出的轮廓一致。这些结果表明，重新排列的CTA可用于更精确地研究湍流中的细尺度结构。此外，由LDIA理论获得的剖面对于讨论湍流是有效的和有用的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号