基于圆柱绕流速度场的压强梯度计算.pdf

免的要接触流体，从而影响到被测流域的流动状态，本课题利用圆柱绕数值 模拟得到速度场数据，通过直接积分法重构压强梯度，为压力场的非接触测量提 供新的技术支持。 圆柱绕流问题的研究主要分为风洞实验和数值模拟两大研究方式。用风洞实 验研究圆柱绕流问题存在实验费用高，实验环境要求严格等问题。因此数值模拟 是现在的主要研究方式。 本设计首先运用 ANSYS Fluent 软件进行圆柱绕流的数值模拟，提取速度场 与压力场的数据，软件数值仿真结果可以较为准确的表达出圆柱绕流的特性；其 次运用直接积分法进行速度场到压力场的转换计算的理论验证，然后再次通过采 用 MATLAB 编程进行直接积分法与编程结果的对比，分析误差。 本文通过 MATLAB 编程实现了圆柱绕流压强梯度的重构，减小了接触式测量 由于传感器或探针测量所带来的误差。 关键词：圆柱绕流；压强梯度；直接积分法； Abstract Fluid motion pressure measurement of conventional method mainly is to use all kinds of pressure sensor or probe, inevitable to contact with the fluid, which affects the flow state of the measured river, this topic columns around the numerical simulation are used to get the velocity field data, by direct integral method to reconstruct the pressure gradient, the non-contact measurement for pressure field provides a new technical support. The study of circular flow around a cylinder is mainly divided into two research methods: wind tunnel experiment and numerical simulation.There are some problems such as high cost of experiment and strict requirement of experiment environment in wind tunnel experiment.Therefore, numerical simulation is now the main research method. In this design, the software Fluent ANSYS is firstly used for the numerical simulation of cylindrical flow around, and the data of velocity field and pressure field are extracted. The numerical simulation results of the software can accurately express the characteristics of cylindrical flow around.Secondly, the direct integration method is used to carry out theoretical verification of the conversion calculation from velocity field to pressure field, and then the direct integration method is compared with the programming results through MATLAB programming again to analyze the e