摘要
探空气象观测中湿度传感器表面结冰、结霜等污染物会降低其测量精度,双加热湿度传感器为该问题的解决提供了可能。为了实现对双加热湿度传感器加热策略进行优化设计,必须研究其稳态及瞬态工作状况。本文采用计算流体动力学(CFD)方法针对测量周期的四个阶段进行了优化设计。利用稳态分析模拟出两个湿度传感器不同间距下的相互影响情况。利用瞬态分析模拟出升温时间和冷却时间特性。传感器测量周期随气压不同在45 s～145 s之间变化。在探空仪上升速度为6 m/s的条件下,两个传感器之间的距离不小于3 mm时,两者互不影响。提出高空和低空两种模式加热策略,分别采用温度降幅为40℃和46℃的测量周期。
In the field of upper air meteorological observation,cloud droplets,ice and frost contamination on the surface of radiosonde humidity sensor may compromise the measurement accuracy.Heated twin humidity sensor opens up a new opportunity to tackle this problem.In order to optimize the heating strategy of heated twin humidity sensor,studying the steady and transient characteristics of the sensor is of great interest.The parameters of the four stages in a measurement cycle have been optimized by using a computational fluid dynamics（CFD）method in this work.Steady-state analysis has been implemented to simulate the interaction of the twin sensors with different spacing.Transient analysis has been carried out to obtain dynamic parameters,including the lengths of heating and cooling stages.The results show that the ranges of the measurement period of heated twin humidity sensor is 45 s～145 s.For cases where the radiosonde rising velocity is 6 m/s,the temperatures of two sensors do not affect each other,if their distance is no less than 3 mm.Two different heating strategies,high-altitude and low-altitude modes,are proposed to optimize the measurement cycle,where 40 ℃ and 46 ℃ are selected as the amplitudes of temperature drop,respectively.
出处
《传感技术学报》
CAS
CSCD
北大核心
2012年第8期1039-1044,共6页
Chinese Journal of Sensors and Actuators
基金
国家公益性行业(气象)科研专项项目(GYHY200906037
GYHY201106048)
国家自然科学基金项目(41075026)
江苏高校优势学科建设工程项目
江苏省科技支撑计划重点项目(BE2011006)
关键词
双加热湿度传感器
加热策略
计算流体动力学
高空气象观测
瞬态分析
heated twin humidity sensor
heating strategy
computational fluid dynamics
high-altitude meteorological observations
transient analysis
