CAJ | 학술논문

用粒子图像测速技术(Particle image velocimetry，PIV)对光滑壁面和沟槽数量为18的模型内的流场进行测量，初步获得沟槽的存在对于环隙内流场的影响规律；同时利用数值计算获得沟槽数量为18的模型内的流场分布，通过对比试验结果和数值模拟结果，验证数值计算方法可靠性。通过数值计算研究沟槽数量0、6、12、18模型内的流场分布，在比较沟槽模型与光壁模型环隙内的速度场和涡量场的基础上，得出以下结论：较少的沟槽数量增加了泰勒涡的轴向尺寸，随着沟槽数的增加，沟槽结构对流场影响不断加剧，环隙内最大径向速度和轴向速度均有不同程度的增加；对比不同轴向位置的流场分布，发现沟槽区域内存在明显的旋涡流动，不同轴向位置沟槽内的流体存在着进出环隙内的运动。
용입자도상측속기술(Particle image velocimetry，PIV)대광활벽면화구조수량위18적모형내적류장진행측량，초보획득구조적존재대우배극내류장적영향규률；동시이용수치계산획득구조수량위18적모형내적류장분포，통과대비시험결과화수치모의결과，험증수치계산방법가고성。통과수치계산연구구조수량0、6、12、18모형내적류장분포，재비교구조모형여광벽모형배극내적속도장화와량장적기출상，득출이하결론：교소적구조수량증가료태륵와적축향척촌，수착구조수적증가，구조결구대류장영향불단가극，배극내최대경향속도화축향속도균유불동정도적증가；대비불동축향위치적류장분포，발현구조구역내존재명현적선와류동，불동축향위치구조내적류체존재착진출배극내적운동。
The taylor vortex flow in the plain and slit 18 models is studied by experimental measurement, the preliminary effect of slit wall on the flow field in annular space is obtained. The flow field in the slit 18 model is also studied by numerical simulation. The reliability of numerical simulation is verified by comparing the experimental and numerical simulation results. The flow field in plain,slit 6, slit 12 and slit 18 model is studied by numerical simulation. The following conclusion is obtained by comparing the velocity and vorticity distribution in different models. The small number of slits in the outer cylinder changed the axial size of the Taylor vortex. As the increasing of the slit number, the effect of slit wall became more obvious, the maximize axial and radial velocity also increases as the increasing of slit number. The vortex flow is found in the slit wall by comparing the flow field in different axial positions, and the flow in the slit wall space has the tendency of moving in and out the annular space.