A Computational Model for Chemical Vapor Infiltration

化学蒸气渗透的计算模型

• 批准号: 9461609
• 负责人: Kanchan Kelkar
• 金额: $ 7.5万
• 依托单位: Innovative Research Incorporated
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9461609&HistoricalAwards=false
• 关键词: Computational; Model; Chemical; Vapor; Infiltration

This Small Business Innovation Research Phase I project is directed toward the development and validation of a comprehensive computational model for chemical vapor infiltration (CVI). It involves a macro model that describes the transport processes in a porous preform. The macroscopic properties of the preform that are needed in the macro model are determined from a micro model in which detailed calculations are made for fluid flow, heat transfer, and mass transfer in a generalized unit cell comprising of fibers of rectangular cross section. The technical objectives of the Phase I effort will be to demonstrate the validity of the crucial ingredients of the model for two-dimensional infiltration process. The specific topics to be considered are: (a) validation of the equivalent unit cell approach, (b) evaluation of preform properties as functions of the density, (c) validation of the overall model for a two-dimensional preform by demonstrating that the results of the proposed model compare well with those obtained from full numerical simulation that accounts for all geometric details, and (d) a case study to demonstrate the usefulness of the proposed model as a design/optimization tool. Use of the proposed computational model will lead to lower manufacturing cost and increased use of ceramic composite materials.

该小型企业创新研究第一阶段项目旨在开发和验证化学蒸汽渗透 (CVI) 的综合计算模型。它涉及一个描述多孔预制件中传输过程的宏观模型。宏观模型中所需的预制件的宏观特性由微观模型确定，在微观模型中，对由矩形横截面的纤维组成的广义晶胞中的流体流动、传热和传质进行详细计算。第一阶段工作的技术目标将是证明二维渗透过程模型关键成分的有效性。要考虑的具体主题是：（a）等效晶胞方法的验证，（b）作为密度函数的预成型件特性的评估，（c）通过证明所提出的模型的结果与考虑所有几何细节的完整数值模拟获得的结果相比较来验证二维预成型件的整体模型，以及（d）案例研究以证明所提出的模型作为设计/优化的有用性 工具。使用所提出的计算模型将降低制造成本并增加陶瓷复合材料的使用。