Analysis and Research on Flow Characteristics ofan Ejection Escape System for a Fighter

摘要

In this paper, a numerical simulation method is introduced to analyze and research the flowcharacteristics of the ejection escape system for a fighter. Based on Jameson' s finite volume method, we havedeveloped a highly precise Euler equation solution with hybrid grid to calculate the aerodynamiccharacteristics of an ejection escape system, whose configuration is very complex, abnormal andunstreamlined. On the base of Euler equation solution, we have also developed a hybrid grid N-S equationsolution using S-A turbulent flow model. Therefore, we have set up a set of numerical simulation methods,especially suitable for a complex ejection escape system on a fighter, and some quicken convergencemeasures taken and a suitable dissipation model used to strengthen the resolver robust in software. Throughchoosing the suitable beginning angle of attack, a successful calculation on the flow above the ejectionescape system has been carried at high angles of attack and high slide angles. There is a good agreementbetween the calculations results and the test results. From the calculation, we can observe the details in theflow field about Mach number, pressure distributions on every part on the ejection escape system. Thecalculation has significance on the analysis of the aerodynamic characteristics for the ejection escape system.The simulation result shows that the flow characteristics around the ejection escape system gained bythe numerical simulation explain and reveal the developing trends of aerodynamic characteristics of anejection escape system at the conditions of high angle of attack and high slide angle.