一个非常规前体机身的流动显示研究

Flow Visualization For An Unconventional Forebody

描述了有类似Ｅｒｉｃｋｓｏｎ前体的非常规机身的初步流动显示研究结果，包括测力、表面油流和激光片光流动显示结果和用层流Ｎ－Ｓ方程进行数值模拟的结果。计算和试验的参数范围：α＝０°～５０°，β＝０°～２０°，虽然计算与试验所用的外形在后部有一些不同，但是两者在涡的位置方面显示了良好的一致性。同时研究也表明，大攻角的流动特性可以通过改变机身前体形状进行控制。通过研究还表明，这类前体在改善大攻角横侧方向安定性方面具有很大的潜力。

Some investigation results of flow visualization are described for an unconventional fuselage with Erickson like forebody in this paper.The experiment includes force measurements,surface oil flow visualizations,and laser sheet flow visualizations.The results are also obtained using CFD code to solve laminar N S equations.Although there are some differences between the experimental model and computation model,the results for the location of vortex exhibit good agreements and the results also show that the flow characteristics at high angles of attack can be controlled by variation of the forebody shape of faselage.It is shown through this investigation that this kind of forebody has the potential to improve the lateral direction stability of the aircraft at high angles of attack.