高速风洞一体形式的喷流影响试验技术研究

Research on metric thrust jet-effects testing methodology in high-speed wind tunnel

详细介绍了FL-3风洞一体形式的喷流影响风洞试验技术,该技术区别于分离形式的喷流影响试验技术,利用波纹管实现了飞行器模型与喷管的一体化设计。天平同时测量模型外部气动力和喷管推力,避免了分离形式喷流影响试验技术存在的喷管几何不完全相似、模型与喷管易碰触、腔压难以准确修正等问题。对一体形式喷流影响试验技术的相似参数、试验原理、波纹管技术等进行了系统介绍,地面调试及风洞试验表明:一体形式的喷流影响试验技术可以获得不同落压比和不同矢量喷流对飞行器的喷流影响量,在经过进一步细节优化后,将形成成熟的试验能力,并依据该技术可以发展喷管性能风洞试验技术、一体形式的推力矢量风洞试验技术等。

The metric thrust jet-effects testing methodology is introduced in FL-3 wind tunnel.Different from the sleeve type jet-effects testing methodology,the airframe is integrated with the nozzle by using the bellows system,and the balance can measure simultaneously the aerodynamic characteristics and the nozzle thrust.The problems such as nozzle geometric incomplete similarity,touching possibility between the model and the nozzle,imprecise modification of the pressure in the model cavity,etc,which exist in the sleeve type jet-effects testing methodology can be avoided by using the metric thrust methodology.The similarity theory,testing methodology and bellows technology of the metric thrust jet-effects testing are discussed in detail in this paper.The experimental results show that jet-effects under different test conditions including different nozzle pressure ratios and vectoring jets can be gained by the metric thrust jet-effects testing methodology.After further improvements of some details,the test capability can be enhanced,and the nozzle performance wind tunnel testing methodology and the thrust vector wind tunnel testing methodology can also be developed based on this methodology.