CAJ | 학술논문

提出了一种新的壁面剪切应力测量方法,使用锯齿状排布的MEMS传感器作为敏感元件,在高速风洞中对研制的剪切应力测量设备进行了原理验证实验.实验结果显示湍流中的局部壁面剪切应力大小是层流中的两倍以上,监测局部剪切应力可以作为一种有效的边界层转捩的实验判定方法.利用这一方法测得的转捩区与使用脉动压力测试技术测得结果一致,验证了通过MEMS元件监测局部剪切应力作为边界层转捩测量手段的可行性和可靠性.
제출료일충신적벽면전절응력측량방법,사용거치상배포적MEMS전감기작위민감원건,재고속풍동중대연제적전절응력측량설비진행료원리험증실험.실험결과현시단류중적국부벽면전절응력대소시층류중적량배이상,감측국부전절응력가이작위일충유효적변계층전렬적실험판정방법.이용저일방법측득적전렬구여사용맥동압력측시기술측득결과일치,험증료통과MEMS원건감측국부전절응력작위변계층전렬측량수단적가행성화가고성.
This paper presents a direct measurement technique for wall shear stress.The capacitive MEMS sensor with pectinate floating element Was developed.The techniques of static and dynamic calibration are in-troduced.The demonstrative experiment wag carried out in a high-speed wind tunnel.The experiment results in-dicate that the local shear stress in turbulent flow is noticeably higher than in laminar flow.Monitoring localshear stress on a model can be also used for determining transition zone.In the present experiment,the transi-tion zone detected by the MEMS sensor is identical with what by the pressure transducer.