CAJ | 학술논문

采用热线风速仪（hot wire anemometry，HWA）测量了?300 mm×2000 mm圆管内轴向旋转流瞬时切向速度随时间的变化，重点分析了切向速度湍流强度的分布特点和旋转流摆动对切向速度湍流强度的影响。测量结果表明，瞬时切向速度由高频的湍流脉动速度和低频的波动速度叠加构成。由于受旋转流旋转中心偏离圆管几何中心造成的旋转流摆动的影响，在圆管中心区域瞬时切向速度随时间的波动速度变化较大，边壁区域瞬时切向速度随时间的波动速度变化较小。通过对瞬时切向速度数据进行概率密度分析可知，切向湍流强度不仅受气流脉动的影响，还受旋转流中心摆动的影响，是由自身气流脉动产生的湍流强度和旋转流摆动产生的湍流强度两部分叠加构成。旋转流摆动导致了中心区域的湍流强度远大于边壁面区域的湍流强度。
채용열선풍속의（hot wire anemometry，HWA）측량료?300 mm×2000 mm원관내축향선전류순시절향속도수시간적변화，중점분석료절향속도단류강도적분포특점화선전류파동대절향속도단류강도적영향。측량결과표명，순시절향속도유고빈적단류맥동속도화저빈적파동속도첩가구성。유우수선전류선전중심편리원관궤하중심조성적선전류파동적영향，재원관중심구역순시절향속도수시간적파동속도변화교대，변벽구역순시절향속도수시간적파동속도변화교소。통과대순시절향속도수거진행개솔밀도분석가지，절향단류강도불부수기류맥동적영향，환수선전류중심파동적영향，시유자신기류맥동산생적단류강도화선전류파동산생적단류강도량부분첩가구성。선전류파동도치료중심구역적단류강도원대우변벽면구역적단류강도。
The real tangential velocity of swirling flow in a circular pipe with diameter 300 mm and length 2000 mm was measured by using hot wire anemometry (HWA), and analysis emphasized on turbulence intensity of the tangential velocity with the effect of oscillation of swirling flow. The real tangential velocity contained high frequency turbulent fluctuation velocity and low frequency fluctuation velocity. The real tangential velocity fluctuated obviously in the center region of the circular pipe, but fluctuated little near the wall of the circular pipe. By analyzing probability density of the real tangential velocity of swirling flow, fluctuation of the real tangential velocity changed greatly along the radial direction. This fluctuation was not only affected by turbulent fluctuation, but also by oscillation of swirling flow. Oscillation of swirling flow resulted in the phenomenon that turbulence intensity of the tangential velocity in the center region was higher than that near the wall.