Development of pulse-type skin friction balance use in shock tunnel.

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Penghao Zhang, Yue Wang, Yunpeng Wang
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引用次数: 0

Abstract

The wall shear stress significantly affects the aerodynamic characteristics and flight safety of hypersonic aircraft. More accurate and reliable diagnostic instruments are required to fully understand and optimize the distribution of wall shear stress in hypersonic high-enthalpy flow. Two types of assembled and integrated skin friction balances for high-enthalpy impulse facilities were developed. The integrated balance was processed using additive manufacturing, also known as 3D printing. The static calibration uncertainty of the two types of skin friction balances is lower than 0.2% FS at 95% confidence. The first-order vibration frequency is about 50 Hz. The applicability and reliability of the developed skin friction balance were verified in the JF-12 shock tunnel built by the Institute of Mechanics, Chinese Academy of Sciences. A series of wall shear measurement tests for flat-plate boundary layers were carried out, in a freestream with a nominal Mach number of 7 and a unit Reynolds number of about 106. The wall shear results were in good agreement with the numerical simulation and empirical formula results. The minimum deviation can reach 3.67% of the measured value, which verifies the applicability and reliability of the two types of skin friction balances for accurate wall shear stress in high-enthalpy pulse flow, especially providing experimental support for the feasibility of the additive-manufactured balance.

激波隧道中脉冲式蒙皮摩擦平衡装置的研制。
壁面剪切应力对高超声速飞行器的气动特性和飞行安全有着重要的影响。为了充分了解和优化高超声速高焓流中壁面剪应力的分布,需要更准确、可靠的诊断仪器。研制了两种用于高焓冲量装置的装配式和集成式表面摩擦天平。集成天平使用增材制造(也称为3D打印)进行加工。两种皮肤摩擦天平的静态校准不确定度在95%置信度下均低于0.2% FS。一阶振动频率约为50hz。在中国科学院力学研究所建造的JF-12激波隧道中,验证了所研制的蒙皮摩擦天平的适用性和可靠性。在名义马赫数为7、单位雷诺数约为106的自由流中,对平板边界层进行了一系列的壁面剪切测量试验。墙体剪力计算结果与数值模拟和经验公式计算结果吻合较好。最小偏差可达实测值的3.67%,验证了两种蒙皮摩擦天平在高焓脉冲流中精确测量壁面剪应力的适用性和可靠性,尤其为增材制造天平的可行性提供了实验支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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