Abstract
The existing experimental methods and numerical models were difficult to get accurate aerodynamic characteristics of the anti-torque system of a NOTOR under rotor wake. To solve this problem, a new three-dimensional aerodynamic model with momentum source based on finite volume method was proposed in this paper. By means of time domain equalization and spatial interpolation, the complicated dynamic meshes on blade were replaced by the non-blade fixed rotor domain with momentum source. And the model was calculated by steady, compressible and three-dimensional Reynolds averaged N-S equation. In this paper, a typical NOTAR was took for research, the aerodynamic characteristics including flow field and variation regularity of lateral force with momentum coefficient of anti-torque system during hover condition was obtained by applying the above computational model, and the accuracy of which was verified by corresponding experimental data. In addition, the model was also used to analyze the key factors that influence working condition of the tail boom, including length of tail boom, area of nozzle and fan pressurization. And the curves of variation regularity were given. The model and work in this paper could provide reference for further research and design on anti-torque system for NOTAR.Keywords: Calculation model; CFD; circulation control; momentum source; NOTAR. DOI: http://dx.doi.org/10.5755/j01.mech.24.2.19740
Highlights
Group A consisted of 5 models and lateral force and moment generated by circulation controlled (CC) tail boom and thruster were calculated respectively
A three-dimensional aerodynamic model for antitorque system of NOTAR based on finite volume methods was proposed in this paper
The model consisted of rotor, variable pitch fan, CC tail boom and thruster
Summary
Vernard [2] tested on circulation control effect on anti-torque system and gave parameter influence including position and angle of slots on lateral force coefficient. Henry [6] gave position of separation point based on experiment and proposed a method to calculate inner and outer flow field separately of the tail boom. Holz [8] established an improved two-dimensional Baldwin-Lomax model to calculate aerodynamic characteristics of wall jet flow over slots. Most of the above numerical researches were limited to two-dimensional models, focused on only CC tail boom or wall jet instead of considering the aerodynamic characteristics of the whole anti-torque system. To overcome the limitations of referred numerical research, this paper proposed a new three-dimensional model with momentum source to calculate aerodynamic characteristics of anti-torque system. The parameter influence on anti-torque system, including length of tail boom, area of nozzle and fan pressurization was calculated
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