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在可压缩流体中利用热线技术进行湍流度测量时,其输出不仅与脉动速度有关,也和流体温度、密度紧密相关。因此,需要建立与高速可压缩流体特征相似的校准装置,在使用前对热线探针进行准确校准。基于亚跨声速可压缩流体,对热线探针校准风洞的气动总体方案、关键结构设计、测控处系统研制等做了介绍和说明。风洞流场校测结果表明,模型区Ma最大偏差0.002,风洞速压可以降低至常规速压的50%以下,也可增至常规速压的1.7倍以上,温度和密度调节范围宽,流场均匀性好,满足热线探针校准需求。
Turbidity measurements using hot-wire technology in compressible fluids are not only related to pulsation velocity but also to fluid temperature and density. Therefore, there is a need to establish a calibration device that is similar in character to a high-speed compressible fluid and to accurately calibrate the hot wire probe prior to use. Based on subsonic compressible fluid, the general scheme of hot wire probe calibration wind tunnel, the key structural design and the development of the monitoring and control system were introduced and explained. Wind tunnel flow field test results show that the model area Ma maximum deviation of 0.002, wind tunnel pressure can be reduced to less than 50% of conventional speed, but also increased to 1.7 times the conventional pressure, temperature and density adjustment range, Flow field uniformity, to meet the hotline probe calibration needs.