pitot tube is made by a vertical cylindrical flow on strut head of tubular device. There are some static pressure around this device in the wall hole, the top one incident flow total pressure of the hole. When both ends of a differential pressure gauge, respectively, and the total pressure tube and static tube connection, the sample can show out on differential gauge pressure values.

pitot tube measurement principle is based on the Bernoulli equation in an instance of application of the air, as shown in figure to the right. When the ideal fluid uniform parallel flow to the stationary object, imagine one of the streamline bump on the object ( The point A of figure right) Bifurcation in the fluid, A point called stagnation or stagnation, point A velocity is zero, the vA = 0.

if we choose two section Ⅰ Ⅰ, Ⅱ Ⅱ, Ⅰ Ⅰ cross section flow is not affected by any of a beam is parallel to the velocity of formation rules of velocity distribution and static pressure of each point on the cross section is equal. Affected Ⅱ Ⅱ cross section flow, flow tight beam, flow speed, the static pressure is reduced. The two surfaces of the Bernoulli equation for