In order to calculate flight attitude in space and measurement period of sounding humidity sensor rising with balloon

an approach based on computational fluid dynamics is proposed. Firstly

five kinds of sensor interval models are established

to obtain the optimal sensor interval. Secondly

four kinds of flight attitudes are set

to gain the optimal flight attitude angle by observing the wall shear stress of sensors. Finally

simulate heating and cooling time of high attitude from 0 to 32 km by using transient analysis

thereby determine measurement period. Simulation results show that the optimum interval is 3. 5

6 mm when inlet velocity is 8 m / s and second inlet velocity

is 10 m /s. When the sensor pitching angle is 45°

wall shear stress is much larger

as a result

ideal pitching angle is 43°

4

8°. Measurement period of the sensor is the time when heating power is 0. 53 W and the sensor temperature exceed environment temperature by 12 ℃.