摘要
确定满足适航要求的严酷工况是机翼结冰适航审定过程中的必要环节,传统的防冰严酷工况计算方法需要大量重复计算,因此,本文结合拉丁超立方抽样和严酷评估指数提出了一种基于CCAR-25附录C(简称附录C)的考虑全飞行阶段、全冰积聚条件确定严酷工况的简化方法,并利用计算流体力学模型验证其可行性。首先,基于附录C明确了结冰工况参数区间,利用拉丁超立方抽样实现了连续参数区间的离散化,获得组合工况;其次,引入严酷评估指数,对结冰工况进行排序,并通过单变量结冰条件及连续最大结冰条件下机翼结冰的计算流体力学仿真计算,验证了在相同冰型下该严酷评估指数可以以结冰量(包括结冰总质量和最大结冰厚度)作为评价指标,用于严酷程度评估,证明了其绝对值越大,工况越严酷;等待阶段由于飞行时间远大于其他飞行阶段,导致其结冰严酷程度最高,严酷工况均在等待阶段;最后,通过本文提出的严酷工况确定方法给出了基于附录C的严酷工况。
Determining the severe working conditions that meet the airworthiness requirements is a necessary step in the air-worthiness certification process of wing icing,and traditional calculation methods of severe anti-icing working conditions require a large amount of repetitive calculations,therefore,this article proposes a simplified method for determining severe working conditions based on Appendix C of CCAR-25(Appendix C)by combining Latin hy-percube sampling and severity assessment index,considering the entire flight phase and full ice accumulation conditions,and its feasibility is verified by computational fluid dynamics model.Firstly,based on Appendix C,the parameter intervals for icing working conditions were clarified,and Latin hypercube sampling was used to discrete the continuous parameter intervals and obtain the combined working conditions.Secondly,the severity assessment index is introduced to rank the icing working conditions,and the computational fluid dynamics simulation calcula-tion of wing icing under univariate icing working conditions and continuous maximum icing working conditions is used to verify that the severity assessment index can be used as an evaluation index for severity assessment under the same ice type,with the amount of icing(including the total mass of icing and the maximum icing thickness).It is proved that the larger the absolute value,the more severethe working working conditions.Due to the significantly longer flight time compared to other flight phases,the waiting phase has the highest degree of icing severity,and all severe working conditions are in the waiting phase.Finally,the severe condition based on Appendix C are given by the severe condition determination method proposed in this paper.
作者
胡雪兰
王艺丹
牛一凡
姚佳伟
HU Xuean;WANG Yidan;NIU Yifan;YAO Jiawei(Sino-European Institute of Aviation Engineering,CAUC,Tianjin 300300,China)
出处
《中国民航大学学报》
2025年第1期11-19,共9页
Journal of Civil Aviation University of China
基金
中国民用航空局安全能力建设基金项目(ASSA2022/11)
中央高校基本科研业务费专项自然科学类重点项目(3122020082)。
关键词
严酷工况
拉丁超立方抽样
严酷评估指数
机翼结冰
适航
severe conditions
Latin hypercube sampling
severity assessment index
wing icing
airworthiness
作者简介
胡雪兰(1982-),女,山东济宁人,教授,博士,研究方向为复合材料电热除冰数值分析.
