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七孔探针以其可对局部大流动角度下流场特性进行较高精度测量、便于外场使用等优势而在复杂流场的测量中得到广泛的应用.为了快速高效地获取空间速度场信息,提出了七孔探针移动扫描的测量方法.为了论证该方法的可行性,引入了七孔探针导压管的压力传递模型.通过对不同几何尺寸导压管的实验研究,测定了压力传递模型中的特性参数,并进一步讨论了导压管几何尺寸与特性参数的关系及其对传压特性的影响.以此为基础,将速度v(压力p)分布近似为一系列斜坡函数的叠加,研究了斜坡信号在导压管中的传输特性,给出了不同几何尺寸导压管对斜率为k的斜坡信号的响应函数及其对应的稳态误差,从而为移动七孔探针的设计及其扫描速度的确定提供了理论依据.通过对圆形射流出口速度分布的实验测量验证了文中方法的可行性.
The seven-hole probe has been widely used in the measurement of complex flow field because of its advantages of high accuracy for the flow field characteristics under local large flow angle and its convenient use in the field. In order to obtain space velocity field information quickly and efficiently, In order to demonstrate the feasibility of this method, the pressure transfer model of seven-hole probe pressure guiding tube was introduced. Through the experimental study of pressure guiding tubes of different geometrical dimensions, the pressure transmission Model, and further discusses the relationship between the geometry of the guide tube and its characteristic parameters and its effect on the pressure transmission characteristics.On the basis of this, the distribution of velocity v (pressure p) is approximated by the sum of a series of ramp functions , The transmission characteristics of the slope signal in the pressure guiding tube are studied. The response functions of the pressure guiding tube with different geometrical dimensions to the slope signal with the slope k and the corresponding steady-state errors are given. Therefore, the design of the moving seven-hole probe And its scanning speed to provide a theoretical basis for the circular jet outlet velocity distribution of the experimental measurement to verify the feasibility of the method in the paper.