A Comprehensive Theoretical Model for Carbon-Carbon Composite Nozzle Recession
A Comprehensive Theoretical Model for Carbon-Carbon Composite Nozzle Recession
复制标题
DOI：
10.1080/00102208508960374
复制
发表时间：
1985
影响因子：
1.9
通讯作者：
K. Kuo;S. T. Keswani
中科院分区：
文献类型：
--
作者：
K. Kuo;S. T. Keswani
建立了C/C喷管后退过程的综合空气热化学模型。该分析同时考虑了扩散和化学动力学对衰退过程的影响。对气相守恒方程进行了平均，以考虑变密度效应。湍流模拟包括最终平均气相守恒方程的两方程(K-ϕ)湍流闭合模型。固相方程组由带有凹面的C/C喷管的瞬时热传导方程组成。对控制方程组进行了数值求解。预测结果与盖斯勒的实验数据吻合较好。研究发现，后退过程受H2O和CO2等氧化性物质向喷嘴表面扩散的限制。化学动力学仅在喷管表面温度较低的初始阶段限制了后退速度。结果表明，随着氧化态物种浓度的增加，衰减率增大。
Abstract A comprehensive aerothermochemical model for the process of C/C nozzle recession has been developed. The analysis accounts for both diffusion and chemical kinetics effects on the recession process. The gas-phase conservation equations are Favre-averaged to account for variable density effects. The turbulence modeling consists of a two-equation (K-ϕ) turbulence closure model for the final averaged gas-phase conservation equations. The solid-phase equations consist of the transient heat-conduction equation For the C/C nozzle with a recessing surface. The governing set of equations is solved numerically. Predicted results compared well with Geisler's experiment data. The recession process was found to be limited by the diffusion of oxidizing species such as H2O and CO2 to the nozzle surface. Chemical kinetics limited the recession rate only in the initial period when the nozzle surface temperatures were low. The recession rate was found to increase with increasing concentration of oxidizing species ...