飞艇模型腹撑支架干扰修正方法研究

对某型飞艇刚性模型的腹撑支架干扰进行了试验研究和数值计算研究。风洞试验采用单点腹撑系统支撑模型,获得飞艇的气动力数据,并通过镜像两步法获得支架干扰量,但是试验无法扣除镜像支架与主支架之间的二次干扰,会给试验数据的支架干扰修正带来一定误差。故采用数值计算方法,对飞艇模型、飞艇模型带腹撑支架、反装模型带腹撑支架、反装模型带腹撑支架和镜像支架等状态下的气动特性进行模拟,获得支架对飞艇绕流场的影响,以及净支架干扰量和二次干扰量的大小,并将计算结果与试验结果对比。对比结果表明,在支架对飞艇气动特性的影响规律上试验与计算结论一致,但在具体数值上二者存在明显差异,表明二次干扰量不可忽视,应在飞艇试验数据的支架干扰修正中予以扣除。

Research on ventral support interference correction for airship model

The wind tunnel test and numerical calculation of ventral support interference for a rigid airship model are conducted in this paper.In the wind tunnel test,the one-point ventral support system is used for sustaining the airship model,the aerodynamic data are acquired,and the support interference values are obtained by the two-step mirror method.However,in the test the secondary interference between the main support and the mirror support can not be deducted, which would bring some errors to the support interference correction.So the numerical method is introduced to calculate the aerodynamic properties in the situations of airship model only,model with support,reverse model with support,and reverse model with main support and mirror sup-port,respectively.Based on the work,the net support interference and the secondary interfer-ence are acquired.By comparing the test and numerical results,some conclusions are drawn as follows:the test and numerical results are consistent about the way in which the support affects the airship aerodynamic properties,but there are obvious differences in the interference values, which shows that the secondary interference can not be ignored and must be considered in the process of support interference correction for the airship wind tunnel test.