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介绍了在电弧风洞上发展的一种新型试验技术。针对某型飞行器,了解其在飞行条件下天线窗烧蚀透波特性对于了解及掌握“黑障”问题及通信信号特点至关重要。在电弧风洞内开展热/透波联合试验考核是地面试验考核的最佳选择,但存在若干技术难点。为此在电弧风洞开展热/透波联合试验技术研究,使用半椭圆喷管,改进进气方式,提升能量利用率;改进电弧加热器结构解决了铜离子对测试的干扰;设计定向天线,在关键部位布设吸波材料解决了试验段内微波反射问题;将收发天线均置于试验段内部,保证天线同频振动,解决了风洞启动时天线抖动导致的信号波动;设计水冷箱体解决了天线窗口长时间气动加热下天线的热防护问题。经试验验证,研究内容是有效的、成熟的、可行的。目前该技术已成功用于指导在电弧风洞上开展的数项试验。
A new type of experimental technique developed on arc wind tunnel is introduced. For a certain type of aircraft, it is very important to understand the characteristics of the antenna window in flight under the conditions of ablation and wave penetration for understanding and mastering the problem of “black barrier” and the characteristics of communication signals. In the arc wind tunnel to carry out joint test heat / penetration test is the best choice for ground test, but there are a number of technical difficulties. To this end in the arc wind tunnel heat / wave joint test technology research, the use of semi-elliptical nozzle, improve the intake mode, improve energy efficiency; improve the structure of the arc heater to solve the interference of copper ions on the test; design directional antenna, Microwave absorbing materials are arranged in the key parts to solve the problem of microwave reflection in the test section. The receiving and transmitting antennas are placed inside the test section to ensure the same-frequency vibration of the antenna and solve the signal fluctuation caused by the antenna jitter when the wind tunnel is started. Antenna window prolonged aerodynamic heating of the antenna under the heat protection issues. The experimental verification, the content of the study is effective, mature and feasible. This technique has now been successfully used to guide several tests conducted in arc tunnels.