CAJ | 학술논문

为了简便地使用测量模型表面脉动压力特征的方法探测边界层转捩位置，需要研究脉动压力传感器接在传统测压模型外的适用性，即通过长细管将模型表面的脉动压力信号传递到脉动压力传感器上的方式是否可得到转捩的特征信号。首先采用信号发生器驱动扬声器，在无风条件下，测量了长细管对不同频率声压信号的传递损失情况。证明了所采用的长细管系统具有合适的工作频带。然后在西北工业大学NF-3低速风洞二元实验段、实验风速为30m／s的条件下，对弦长为800mm、展长为1．6m的翼型模型沿弦向进行了脉动压力信号测量，并通过改进的数据处理技术判断了模型表面的转捩位置。研究结果表明，采用长细管系统进行脉动压力方法转捩探测具有一定应用价值，值得进一步深入研究。
위료간편지사용측량모형표면맥동압력특정적방법탐측변계층전렬위치，수요연구맥동압력전감기접재전통측압모형외적괄용성，즉통과장세관장모형표면적맥동압력신호전체도맥동압력전감기상적방식시부가득도전렬적특정신호。수선채용신호발생기구동양성기，재무풍조건하，측량료장세관대불동빈솔성압신호적전체손실정황。증명료소채용적장세관계통구유합괄적공작빈대。연후재서북공업대학NF-3저속풍동이원실험단、실험풍속위30m／s적조건하，대현장위800mm、전장위1．6m적익형모형연현향진행료맥동압력신호측량，병통과개진적수거처리기술판단료모형표면적전렬위치。연구결과표명，채용장세관계통진행맥동압력방법전렬탐측구유일정응용개치，치득진일보심입연구。
Low speed flow transition zone of boundary layer can be detected by means of pres-sure fluctuation measurement over the surface of the test model.It is convenient that fluctuation pressure transducers are arranged outside the model through long-fine tubing system.The distor-tion of pressure signal caused by the tubing system should be recognized.Under the static condi-tion(V= 0m/s),the authors measured a series of sound signals over an airfoil model surface through the tubing system.The sound signal source come from a speaker actuated by a signal generation.The model chord length is 0.8m and the model span is 1.6m in length.The tubes are about 1.2m long and their inner diameters are 0.8mm.The tubing system has proved to be able to transmit the characteristics of the surface pressure fluctuation for the transition detection.Un-der the condition of section flow velocity V= 30m/s,signals of the surface pressure fluctuation transmitted along the chord of the model were measured and the boundary layer transition zones were located.This experiment was conducted in NF-3 low-speed wind tunnel of Northwestern Polytechnical University.The authors suggest that the pressure fluctuation transition diagnostic method with long-fine tubing system is promising and further researches should be carried out.