Research On Aerodynamic Interference Of Propeller And Inlet

Propeller slipstream is a complex unsteady phenomenon that affects the aerodynamic performance of the turboprop nacelle/inlet,and the presence of the nacelle/inlet also affects the aerodynamic performance of the propeller.Correct understanding of the flow structure and aerodynamic performance between them has important theoretical significance and engineering application value for the integrated design of propeller and engine nacelle/inlet.In this paper,the multi-reference frame?MRF?method and the slip grid unsteady method are used to simulate the propeller/navigation/inlet integrated configuration,and the propeller/navigation/inlet port integration is realized inside and outside.Flow-coupled flow field simulation was carried out to study the aerodynamic interference between the propeller slipstream and the inlet.Firstly,the design and integrated simulation method of the inlet port for turboprops at home and abroad are summarized,and the calculation results of the multiple reference frame?MRF?method and the slip grid method are compared.The results show that the error between the time-averaged value calculated by the MRF steady method and the mean value of the slip-mesh unsteady method is within5%;the multiple reference system method is shorter and the slip grid rule can be used.Study the unsteady phenomenon of propeller slipstream.Secondly,a S-shaped inlet for turboprops is designed.The flow field structure and aerodynamic performance of the non-paddle configuration and the paddle configuration inlet under different working conditions are compared and analyzed.The unsteady phenomenon of the aerodynamic interference of the road is analyzed.The results show that the total pressure recovery coefficient?and the distortion index DC₆₀ of the inlet outlet decrease with the increase of the Mach number of the outlet;the slip flow of the propeller increases the total pressure and distortion index of the inlet.The increase of the distortion index DC₆₀ at the inlet of the inlet is the result of the interaction between the circumferential speed of the propeller and the low energy flow near the wall of the inlet.Thirdly,the integrated flow structure under the propeller/small tank/inlet layout scheme and the intake air are studied under the axial relative position between the propeller and the inlet of the inlet and the different slip angles and angles of attack.The aerodynamic performance of the track and propeller is analyzed.The results show that the aerodynamic performance of the inlet port is optimal when the propeller is installed at the 0.0657D position.The inflow side slip angle has a great influence on the aerodynamic performance of the inlet port outlet,and the incoming flow angle of attack has little influence on the inlet performance of the inlet port.Finally,a numerical simulation of a propeller inlet with a particle separator is carried out to study the aerodynamic performance and flow field structure of the propeller slipstream on the inlet with particle separator.The results show that as the flow ratio of the inlet of the inlet to the outlet of the particle separator increases,the flow field separation zone in the inlet decreases.