Aerodynamics-based Light Aircraft Fuselage Design Research

After the intensive introduction of policies related to general aviation in China,emergency rescue,short-haul transportation,medical ambulance,business aviation,low altitude economy and other business sectors have become the focus of the industry layout.The visual differences from different light general aviation aircraft are mainly affected by the difference of aerodynamic layout（for example,the upper monoplane and lower monoplane layout will cause obvious visual differences）.Obvious,due to complex aerodynamics and other reasons,as well as different processes and performance,aircraft models usually have very low degrees of freedom.In this paper,we will focus on the optimal aerodynamic performance of light airplane fuselage shapes.First of all,we will summarize the existing small general aviation fuselage shapes into two categories:wedge and tadpole.The "RuiXiang RX4E" was chosen as the representative wedge-shaped fuselage,and its fuselage was modeled in the reverse direction.A suitable calculation domain was established,and Fluent simulation was used to measure the air resistance under certain conditions of the model.Based on this,the tadpole-shaped fuselage was used as the target,and iterative modifications were made gradually to derive seven gradient fuselage models.Using the same size calculation domain and calculation conditions,the air resistance of these models was simulated and measured to obtain the corresponding trend change diagrams,and the range of the minimum air resistance values in the research target was obtained to implement the final design.For the future light airplane fuselage modeling,a design evaluation method based on optimal aerodynamic performance is provided.