摘要:
为了在风洞中发展新型的腹支撑方式,基于FD-09风洞现有的下大迎角机构,设计研制了一套新型的单点腹支撑系统。单点腹支撑系统具有系统简便实用、模型设计简单、支撑干扰相对稳定等特点。在地面效应试验中使用布置光栅尺位移传感器的新方法取代了传统的测量方法,大大提高了控制精度和试验效率。风洞试验表明:单点腹支撑系统的试验重复性精度较高,部分指标已经接近国军标的先进指标;单点腹支撑系统的支杆干扰量是稳定的,并且对大部分气动分量的干扰量是小量;与双点腹支撑系统比较而言,单点腹支撑系统具有支杆干扰较小的优势。
Abstract:
Because the flow around afterbody of transport airplane were badly disturbed by using general rear sting support,ventral support became important support form for transport airplane with upswept afterbody in wind tunnel.There are three kinds of ventral support form according to the support point amount,i.e.single point,double point,and three point.In order to reduce the interference of ventral support,a new-style single point ventral support system was designed and developed in FD-09 low speed wind tunnel based on existing underside high angle of attack experimental mechanism.The single point ventral support system has been completed and put in applications in 2011.It was used for the test of transport airplane and unmanned aerial vehicle.The single point ventral support system was consist of angle of attack mechanism, connecting joint,ventral support sting,and internal balance.The characteristics of single point ventral support system included:the system was simple and convenient for practical application, the model could be easily designed,support interference was relatively stable.The mainly per-formance index of single point ventral support system included:the range of angle of attack was-40°~40°,the range of angle of yaw was-30°~30°,the control precision of angle was 0.05°.The forced transition of support sting was obtained by covering nylon nets.In order to measure sup-port sting interference,the mirror support sting was also covered nylon nets for forced transi-tion.The traditional measurement method for the distances between model and floor was re-placed by a new method using grating ruler displacement sensors in ground effect test,and the control precision and test efficiency were greatly improved.The test results showed that the re-peated test precision of single point ventral support system was higher,and some precision index was close to advanced precision index of GJB.The support interference of single point ventral support system were relatively stable,and the mostly interference were small.The support inter-ference of single point ventral support system was less than the support interference of double point ventral support system.
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