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| 1 | Steady-state coupled analysis of flowfields and thermochemical erosion of C/C nozzles in hybrid rocket motors显示文摘A hybrid rocket can be used in various applications and is an attractive propulsion system.However,serious erosion of nozzles is common in motor firing operations,which could restrict the application of hybrid rocket motors.Usually,the serious erosion is attributed to the high concentration of oxidizing species in hybrid motors,while the details of flowfields in the motors are not paid special attention to.In this paper,first the thermochemical erosion of C/C nozzle is simulated coupled with the flowfields in a 98%H2O2/hydroxyl-terminated polybutadiene(HTPB)hybrid rocket motor.The simulation is made on a typical axisymmetric motor,including a pre-combustion chamber,an aft-combustion chamber and nozzle structures.Thermochemical reactions of H2O,CO2,OH,O and O2with C are taken into account.Second,the change of flowfields due to fuel regression during motor firing operations is considered.Nozzle erosion in different flowfields is evaluated.Third,the results of nozzle erosion in the coupled simulation are compared with those under uniform and chemical equilibrium flow and motor firing test results.The results of simulation and firing tests indicate that the thermochemical erosion of nozzles in hybrid motors should be calculated coupled with flowfields in the motor.In uniform and chemical equilibrium flowfields,the erosion rate is overestimated.The diffusion flame in hybrid motors protects the nozzle surface from the injected oxidizer and high temperature products in flowfields,leading to a relatively fuel-rich environment above the nozzle.The influence of OH and the geometry of motor should also be considered in the evaluation of nozzle erosion in hybrid motors. | ZHAO Sheng TIAN Hui WANG PengFei YU NanJia CAI GuoBiao | 2015 | Science China(Technological Sciences)2015，58，3： | 2 |
| 2 | Comparison of ablative and compressive mechanical behavior of several PICA-like ablative materials显示文摘It is significant to compare the ablative and compressive mechanical behavior of different PICA-like materials in the engineering applications.The plasma wind tunnel ablation tests with high-entropy air and CO2 atmospheres,and compressive experiments in the ambient and 150℃,were conducted for three kinds of PICA-like materials(CF/PR-Si,CBCF/PR-SiOC and NQF/PR-Si composites).The traditional carbon/phenolic(C/PR)braided composites were also used for comparison.PICA-like materials have the better thermal insulation than traditional C/PR composite,especially for CBCF/PR-SiOC composite.The ablation behavior of CF/PR-Si and CBCF/PR-SiOC PICA-like materials in the CO2 atmosphere can produce a large amount of SiO2 in the form of coatings,oxide layers and skeletons on the ablated surface,which are greatly different from that in the air atmosphere.The compressive behavior of PICA-like material is greatly depended on the fiber fabrics,and exhibits the large discrete characteristics.The longer fiber in the PICA-like materials plays the role in maintaining the material integrity,while it may increase the thermal conductivity. | ZHANG Jun FANG GuoDong YANG LingWei LI Wei HONG ChangQing MENG SongHe | 2020 | Science China(Technological Sciences)2020，63，8： | 2 |
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