免费皮托管速度计算器
根据皮托管测得的压差计算流速。
流速
33.1970 m/s
Flow Velocity vs Total (Stagnation) Pressure
公式
## Pitot Tube A pitot tube measures airspeed by comparing stagnation (total) and static pressure. ### Formula **v = sqrt(2 (P_total - P_static) / rho)** where the difference (P_total - P_static) is the dynamic pressure q = 0.5 rho v^2. Pitot tubes are standard instruments on aircraft for measuring airspeed.
计算示例
Aircraft: P_total = 102 000 Pa, P_static = 101 325 Pa, rho = 1.225 kg/m3.
- 01dP = 102000 - 101325 = 675 Pa
- 02v = sqrt(2 * 675 / 1.225)
- 03v = sqrt(1102)
- 04v = 33.2 m/s = 119.5 km/h
常见问题
What is stagnation pressure?
It is the pressure at a point where the flow is brought to rest (stagnated). It equals static pressure plus dynamic pressure.
How does a pitot-static system work on an aircraft?
The pitot port faces forward to capture total pressure. Static ports on the fuselage measure ambient pressure. The difference gives dynamic pressure and hence airspeed.
Does this work for supersonic flow?
For supersonic flow, a bow shock forms ahead of the pitot tube. A modified (Rayleigh) equation accounting for the shock must be used.
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