无尾桨及其实验研究

NOTAR AND ITS APPLICATION

介绍了无尾桨概念及带环量控制尾梁的直升机模型在风洞中和旋翼下的测压实验，主要研究动量系数和缝隙几何参数对圆柱尾梁上气动力的影响；另外，对环量控制尾梁上的流动状态也进行了显示实验。通过对实验结果的分析，研究环量控制尾梁的原理及应用。

The concept of no tail rotor (NOTAR) was introduced in this paper.A helicopter model with circulation control tailboom was designed and tested to measure the pressure distribution on the tailboom surface in wind tunnel and under rotor respectively.The main purpose of the test was to study the effect of the momentum coefficient and the slot's geometry on the aerodynamic forces of the circulation control tailboom.The flow patterns on the tailboom were also visualized.By analyzing the test results,the circulation control and its application was studied.Reasonable explanations have been given about the test results and some new conclusions have been obtained.