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Zhang P.-H.,China Aerodynamics Research And Development Center | Wang M.,Chengdu Aircraft Design Institute | Deng Y.-Q.,China Aerodynamics Research And Development Center | Chen X.-L.,China Aerodynamics Research And Development Center
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2013

The method based on overset unstructured grid technique is developed for the simulation of cavity flows and store separation. The numerical simulation for typical cavity flows and separation trajectory of WPFS model have achieved good agreement with experimental data and shown a promising capability for applications. The numerical simulation of door operation and store separation trajectory has been made to investigate the unsteady effects on aerodynamic characteristics of the door flap. It is found that under certain conditions, the door's movement has a strong effect on aerodynamic characteristics of the door flap, which must be seriously considered during the door flap and control system design procedure. Under current conditions, all the store separation procedure is safe. The present research provides a technical support for door flap design and store separation evaluation. Source

Tian Y.,Beihang University | Liu H.,Beihang University | Yin J.,Chengdu Aircraft Design Institute | Luo M.,Beihang University | And 2 more authors.
Chinese Journal of Aeronautics | Year: 2015

Simulation-based training is a promising way to train a carrier flight deck crew because of the complex and dangerous working environment. Quantitative evaluation of simulation-based training quality is vital to make simulation-based training practical for aircraft carrier marshalling. This paper develops a personal computer-based aircraft carrier marshalling simulation system and a cave automatic virtual environment (CAVE)-based immersive environment. In order to compare the training effectiveness of simulation-based training and paper-based training, a learning cubic model is proposed and a contrast experiment is carried out as well. The experimental data is analyzed based on a simplified Kirkpatrick's model. The results show that simulation-based training is better than paper-based training by 26.80% after three rounds of testing, which prove the effectiveness of simulation-based aircraft carrier marshalling training. © 2015 Production and hosting by Elsevier Ltd. Source

Zhan J.-X.,Beihang University | Zhan J.-X.,Chengdu Aircraft Design Institute | Wang J.-J.,Beihang University
Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics | Year: 2010

Force measurement experiment was conducted in a low speed wind tunnel to investigate the effect of the flexibility of common swift's wing on the longitudinal aerodynamics of wing with large aspect ratio. The result shows that the change of spanwise camber due to wing's flexibility enhances lift and reduces drag, increases the maximum lift-to-drag ratio and delays stall. The wing flexibility could improve the longitudinal aerodynamics of large-aspect-ratio wing, which is significant to birds' flight and the design of micro air vehicle. Source

Xia Z.,Northwestern Polytechnical University | Ma Y.,Northwestern Polytechnical University | Yun S.,Northwestern Polytechnical University | Xiong X.,Chengdu Aircraft Design Institute
Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University | Year: 2013

Constant amplitude tension-tension fatigue experiments were done on glass-fiber reinforced aluminium laminates. The fatigue crack growth and delamination growth were investigated on centre crack specimens. Crack growth rate almost kept constant with crack growing, and delamination length kept linear relation with crack length. Based on finite element method analysis method, the effective stress intensity factors were established at crack tip, and Paris-law was used to predict the crack growth rate. It is shown that the numerical results agree with experimental results; this agreement proves that this method can be used to predict fatigue crack growth rates in this hybrid laminate. Source

Zhang S.-L.,Nanjing University of Aeronautics and Astronautics | Shan Y.,Nanjing University of Aeronautics and Astronautics | Zhang Y.,Chengdu Aircraft Design Institute | Zhang J.-Z.,Nanjing University of Aeronautics and Astronautics
Tuijin Jishu/Journal of Propulsion Technology | Year: 2012

To get the structure of single expansion ramp nozzle (SERN) with good pneumatic performance and small infrared radiation, based on CFD/IR numerical calculations, the effects of slots area ratio, angle of slots and nozzle pressure ratio (NPR) on the aerodynamic and infrared radiation characteristics were revealed for the SERN. The results show that on the condition of low NPR, the slots form the "aerodynamic boundary" to improve the aerodynamic performances of the nozzle. On the condition of high NPR, the hot gas enters the slots to decrease the thrust coefficient. With the slots, the infrared radiation intensity of SERN is largely decreased. The infrared radiation intensity is decreased 90% at 0° on XOY plane. With increase of slots area ratio, the infrared radiation intensity is decreased. The angle of slots has little effect on infrared radiation intensity of SERN. Source

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