Experimental Study of Thermal Modeling for Stratospheric Platform Airship

High-Altitude Platforms - Present Situation and Technology Trends

“…This effect is called superheating, when the temperature of the internal gas is higher than that of external air, or supercooling, in the opposite case (Harada et al 2003). This difference of temperature may be caused by several factors, such as direct solar radiation, solar radiation reflection on Earth's surface or clouds (albedo), expansion of the lifting gas during climbing or compression in descent, changes in atmospheric temperature (day/night) and warming caused by operation of photovoltaic cells (Yao et al 2014).…”

Transient thermal behavior of stratospheric balloons at float conditions

“…The accuracy of the current model is evaluated by comparison with one of the experimental results on the thermal characteristics of a 35 m-long PV-equipped airship model (Harada et al, 2003). This 35 m airship had been developed since 2002 in Japan and the ground tests were performed in June 2003.…”

“…Louchev (1992) used a steady-state thermal model of airships and hot air balloons to study the shell temperature field and the average temperature of the lifting gas in several steady-state conditions. Harada et al (2003) conducted the numerical and experimental investigations on the circumferential temperature of airships. Franco and Cathey (2004) developed a thermal performance model on NASA's scientific balloons to investigate the temperature distribution of sphere, zero pressure balloons and ultra long duration balloons at float conditions neglecting convection.…”

Numerical Simulation and Thermal Analysis of Stratospheric Airship

“…(3) (4) (5) (6) According to the geometric relation of solar altitude angle H, solar azimuthal angle γ and solar vector , solar vector can be expressed as: (7) Considering that solar vector under body axes coordinate system is needed finally, therefore, solar vector under horizontal coordinate system should be converted to body axes coordinate system. Based on the definition of the two coordinate systems, let J is the transformation matrix from horizontal coordinate system to body axes coordinate system, and J can be given as: sin sin cos cos sin sin sin cos sin cos cos cos sin sin sin cos sin sin sin cos sin sin cos cos cos co cos co s s s co J (8) Where , , are the pitch angle, roll angle and course angle of stratospheric airship.…”

“…Currently, United States, Japan, and South Korea are the major countries to develop stratospheric airships. [1][2][3][4][5][6][7][8][9][10] Generally, solar energy is used for providing power to high-altitude long-endurance airships, and this type of power system is a PV array coupled to an energy storage system. [2] The PV array is an important component in the airship power system.…”