Analysis of the work performance of the lift mode crosswind kite power system based on aerodynamic parameters

Abstract

High-altitude wind power generation mainly collects wind energy at a certain altitude through tethered aircraft. This article discusses the current status of the research on the power system of the cut wind flying kite, and derives the relationship between the drag coefficient and the solidity factor and aerodynamic coefficient χ of the towed kite in the lift mode. Furthermore, the formulas of lift-type working power coefficient and waste power coefficient are discussed. It is pointed out that the power coefficient CPLkwill increase with the increase of the aerodynamic coefficient χ and increase with the decrease of the Solidity factor σ, but the drag coefficient will be a≤1/2. The product of the Solidity factor and the aerodynamic coefficient σχ≤4. Analyzed the characteristics of each system parameter, and then used the concepts of effective power and waste power to derive the efficiency formula of the system, and pointed out that the range of reasonable work efficiency is 0.33∼0.5.

Keywords

• Airborne wind energy
• Crosswind kite power system
• Solidity factor
• Aerodynamic coefficient
• Lift mode
• Pumping kite