Analysis of flow and heat characteristics of seal structure with gap and cavity under the impact of high speed airflow

作者：Shen Chun; Xia Xinlin^*; Cao Zhanwei; Yu Mingxing

来源：Acta Aeronautica et Astronautica Sinica, 2012, 33(1): 34-43.

DOI：CNKI:11-1929/V.20110615.1322.005

• Air flow fields
• Characteristic parameter
• Experimental test
• Field temperature
• Heat characteristics
• High speed airflow
• Seal structure
• Structural layout
• Temperature variation
• Thermal condition
• Unsteady process

In view of the fact that the characteristic parameters of a high Mach flow field vary much faster than those of the solid field, a program of approximate numerical simulation of the semi-decomposd fluid and solid coupling is developed and compiled. The calculating error of the method is analyzed by numerical simulation, and the results show that this method can accurately simulate the fluid and solid coupling in a high speed airflow field during a long unsteady process. The process of a high speed airflow impacting the seal structure is simulated by this method and the program is proved to be feasible after a comparison of the calculated results with the related experimental test. And then the features of the airflow invading the seal structure are analyzed. The contours of the flow field temperature, pressure and velocity inside and outside the seal structure and the their variation during the course of an unsteady process are summarized. The variation of the aerodynamic heat flux of the heating board with time is analyzed. The rules of the temperature variation of the seal structure with time are investigated. Finally, the results show that the structural layout of the seal plays a decisive role in the seal structure's thermal conditions.

• 出版日期2012