MATHEMATICAL MODEL OF HOT-AIR BALLOON STEADY-STATE VERTICAL FLIGHT PERFORMANCE
نویسندگان
چکیده
Vertical flight performance of Lighter-than-Air free hot-air balloons is derived and discussed. Novel mathematical model using lumped-parameters has been used to balloon dynamics steady-state in particular. Thermal was not treated as the super-heat under control aeronauts/pilots. Buoyancy or gross lift, net effective specific excess lift were for a general single envelope can be applied hot-air, gas hybrid balloons. Rate-of-climb, absolute ceiling, rate-of-descent, maximum rate-of-descent uncontrolled terminal descent have all modeled sample computations performed AX8 AX9 FAI-class Lifting index net/effective computed treating ambient hot air ideal gases at various pressure altitudes representative temperatures. Drag coefficient upward downward vertical flights chosen based on best available data. Experimental scale full-scale tests are suggested more accurate estimates external aerodynamics flights. CFD coupled inner- external-flows also recommended future efforts. Knowledge balloon’s essential planning operational safety flight.
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ژورنال
عنوان ژورنال: Aviation
سال: 2021
ISSN: ['1648-7788', '1822-4180']
DOI: https://doi.org/10.3846/aviation.2021.15330