Abstract
Limited longitudinal control authority due to the absence of a horizontal tail and short lever arm is a critical challenge for blended-wing-body (BWB) aircrafts, especially during take-off and landing conditions. To address this issue, an extended external blown elevon is promoted as an alternative. The control capability of this new type of elevon is studied using computational fluid dynamics (CFD) methods. A parameter study is performed on the extended position. The control authority of the blown elevon is more efficient than that of the conventional plain elevon under different flight conditions because of the lengthened lever arm, flow-separation suppression and jet-blowing effects. The effects of a one-engine inoperative (OEI) condition on the control capability is also evaluated. The results indicate that the blown elevon can alleviate the directional moment caused by OEI. It is concluded that the external blown elevon can be a potential option for longitudinal control in practical BWB design.
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