Flying model instead of aerodynamic pipe
DOI:
https://doi.org/10.34169/2414-0651.2020.4(28).66-74Keywords:
flying model, flight and tube experiment, polar, aerodynamic quality, efficiencyAbstract
The article deals with the methodology for using a flying model with an electric motor to determine the aerodynamic characteristics of an aircraft with a propulsion system. This category includes a rather large class of unmanned vehicles operating at subcritical flight speeds. The advantages of this method of obtaining aerodynamic characteristics are shown. The main one is that the experiment is carried out under conditions close to those where the full-scale analogue of the model is operated. In addition, the method is cheaper tube experiment and it is available not only for professional designers, but also for many fans. An advantage should also be attributed to the fact that the full-scale aircraft itself can be used as an experimental model. The methodology is based on a method for measuring the power of a power plant by electrical parameters: current and voltage. This power is compared with the required power to move the aircraft in the air and the result is a formula for drag coeffi cient. A lift coefficient is added to it and a polar is built. To calculate propeller thrust and efficiency, the method of successive approximations is used. A flight program has been developed to obtain the necessary flight parameters and a technique for processing them. Since the model, unlike a pipe, functions in a real air flow and it is free from restrictions imposed on a pipe experiment, the final result obtained may not be so expensive and more reliable.
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References
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