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Ablation characteristics of insulator under high-temperature gas dual-pulse erosion

Defence Technology（防务技术） 2022年第10期18卷 1875-1885页

作者： Yang Liu Xiao-cong Li Peng-fei Zhu Kun Xi Northwestern Polytechnical University 710072Xi'anPR China Xi'an Modern Chemistry Research Institute 710065PR China Department of Aerospace Propulsion Technology Science and Technology on CombustionInternal Flow and Thermal-Structure LaboratoryShaanxiPR China

This study numerically simulated and investigated the flow field characteristics of a typical dual-pulse solid rocket motor with a soft pulse separation device through thermal insulation ablation under high-temperature dual-pulse *** ablation rate of ethylene-propylene-diene monomer(EPDM)insulator was measured after the *** results were analyzed through scanning electron microscopy and microcomputed *** ablation mechanism of the EPDM insulator under the operation conditions of a dual-pulse solid rocket motor was evaluated by analyzing the *** results reveal that the internal flow field of the motor with a soft pulse separation device is *** original charred layer existing on the EPDM insulator surface in the first pulse combustor is the decisive factor affecting the final ablation rate of the dual-pulse motor during the second pulse operation,and the ablation characteristic region is easily formed with the exfoliation of the charred *** ablation rate difference of the insulator increases with gas velocity.

关键词： Dual-pulse solid rocket motor high temperature gas Ablation PSD Charred layer

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PRECURSOR IONIZATION AHEAD OF STRONG SHOCK WAVES IN ARGON

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Acta Mechanica Sinica 1993年第4期9卷 354-362页

作者：崔季平范秉诚何宇中 Institute of Mechanics Academia Sinica Beijing China 100080

The mechanism of precursor ionization ahead of strong shock waves has been studied in a low density shock tube. The experimental results are illustrated with Arrhenius plots with kink points dividing them into two parts with apparent activation energy ratio 1:2, namely with the values 7.7 eV and 15.3 eV, and varying with first and third power of the density respectively. A model is proposed to interpret the facts where the process taking place in the precursor region is a two step photo ionization accompanied with the drift flow effect of the gas relative to the shock wave or the ionization recombination effect according to whether the shock speed and initial density are low enough. The product of the A-A collision excitation cross section coefficient S* multiplied by the radiation cross section Q of Argon S×Q=1×10^(-36)(cm^4eV^(-1)) and the three body recombination coefficient of Argon at room temperature k_(ra)=1×10^(-24)(cm^(-6)s^(-1)).

关键词： shock wave precursor ionization high temperature gas ionization process

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Numerical and Experimental Studies of an Arc-heated Nonequilibrium Nozzle Flow

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Journal of Thermal Science 2003年第4期12卷 289-293页

作者： Michio Nishida Ken-ichi Abe Hisashi Kihara Department of Aeronautics and Astronautics Kyushu University Fukuoka 812-8581 JapanDepartment of Aeronautics and Astronautics Kyushu University Fukuoka 812-8581 JapanDepartment of Aeronautics and Astronautics Kyushu University Fukuoka 812-8581 Japan

The arc-heated high-temperature gas is rotationally and vibrationally excited, and partially dissociated and ionized. When such gas flows inside a nozzle, energy transfers from rotational and vibrational energy modes to translational energy mode, and, in addition, recombination reactions occur. These processes are in thermal and chemical nonequilibrium. The present computations treat arc-heated nonequilibrium nozzle flows using a six temperature model (translational, rotational, N2 vibrational, O2 vibrational, NO vibrational and electron temperatures), and nonequilibrium chemical reactions of air. From the calculated flow properties, emission spectra at the nozzle exit were re-constructed by using the code for computing spectra of high temperature air. On the other hand, measurements of N2+(1-) emission spectra were conducted at the nozzle exit in the 20 kW arc-heated wind tunnel. Vibrational and rotational temperatures of N2 were determined using a curve fitting method on N2+(1-) emission spectra, with the vibrational and rotational temperatures for N2 and N2+ being assumed equal. Comparison of the measured and computed results elucidated that the experimental temperatures were larger than the computed ones. At present, we are trying to reveal the main reason for the discrepancy between the computed and measured N2 vibrational and rotational temperatures.

关键词： nozzle flow high temperature gas nonequilibrium flow arc-heated gas.

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