烧蚀后C-SiC复合材料隔离段内激波串长度预测

推进技术 ›› 2019, Vol. 40 ›› Issue (2): 285-294.

烧蚀后C-SiC复合材料隔离段内激波串长度预测

曹学斌,满延进,李大进,朱守梅

北京动力机械研究所激光推进及其应用国家重点实验室，北京 100074,北京动力机械研究所激光推进及其应用国家重点实验室，北京 100074,北京动力机械研究所激光推进及其应用国家重点实验室，北京 100074,北京动力机械研究所激光推进及其应用国家重点实验室，北京 100074

发布日期:2021-08-15
作者简介:国家自然科学基金青年基金(11502262)。通讯作者:曹学斌，博士，高级工程师，研究领域为内流气体动力学。

Prediction of Shock Train Length in C-SiC Composite Isolator after Thermal Ablation

State Key Laboratory of Laser Propulsion and Application，Beijing Power Machinery Institute，Beijing 100074，China,State Key Laboratory of Laser Propulsion and Application，Beijing Power Machinery Institute，Beijing 100074，China,State Key Laboratory of Laser Propulsion and Application，Beijing Power Machinery Institute，Beijing 100074，China and State Key Laboratory of Laser Propulsion and Application，Beijing Power Machinery Institute，Beijing 100074，China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究畸变气流影响下烧蚀后的C-SiC复合材料隔离段内激波串长度预测问题，设计了能够模拟进气道喉道流场畸变的隔离段直连台，并开展了马赫数2.5和3.5来流的两种不同烧蚀程度的C-SiC复合材料隔离段直连实验，获得了有效的纹影和压力数据，结合实验和理论分析，采用无量纲不平度[hs/Dhy]来表征烧蚀后C-SiC隔离段内壁面严重不规则粗糙特征，尝试在Waltrup公式中增加包含无量纲不平度的因子(1+4[hs/Dhy])，以此形成新的公式来预测烧蚀后C-SiC隔离段内激波串长度，预测精度较原来公式大幅提高，按照10%的误差带分析，修正后的Waltrup公式预测精度提高了33.3%。

关键词: 隔离段；激波串；畸变；不平度

Abstract: In order to investigate the prediction of shock train’s length in the ablated C-SiC isolator under the influence of distorted flow， the direct connect experiment equipment which could simulate the distorted flow was designed， and experiments of two different ablated C-SiC isolators were conducted in Mach 2.5 and 3.5 flows， schlieren pictures and wall pressure were obtained. Combined with experimental and theoretical analysis， it is proposed that the dimensionless unevenness [hs/Dhy] is used to characterize the severe irregular roughness of the walls of ablated C-SiC isolators. In order to create a new formula to accurately predict the shock train’s length in the ablated isolator， the dimensionless factor(1+4[hs/Dhy])was added to the Waltrup formula. The prediction accuracy of the new formula is significantly higher than the Waltrup formula. The accuracy is improved by 33.3% according to the error band of 10%.

Key words: Isolator；Shock train；Distortion；Unevenness

曹学斌,满延进,李大进,朱守梅. 烧蚀后C-SiC复合材料隔离段内激波串长度预测[J]. 推进技术, 2019, 40(2): 285-294.

CAO Xue-bin,MAN Yan-jin,LI Da-jin,ZHU Shou-mei. Prediction of Shock Train Length in C-SiC Composite Isolator after Thermal Ablation[J]. Journal of Propulsion Technology, 2019, 40(2): 285-294.

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