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本文分析放宽静稳定度对改善飞机性能的影响及其气动原理,着重介绍它对飞机平衡阻力影响的计算方法。以歼七为例的计算结果与国外资料、国内型号试验结果相比较在量级上是相符的。计算方法易于作工程估算。计算结果表明放宽静稳定度对改善飞机性能的影响,其量级超音速范围比亚音速的大2倍。本方法还可对其它气动导数如m_z~φ、m_(zo)等对飞机平衡阻力的影响进行敏感性研究。
This paper analyzes the effect of relaxation of static stability on the improvement of aircraft performance and its aerodynamic principle, emphasizing its calculation method of the impact on the aircraft’s balancing resistance. The calculation result of J-7 is consistent with that of foreign data and domestic model test results on the order of magnitude. Calculation method is easy to make engineering estimates. The calculated results show that the relaxation of the static stability can improve the performance of the aircraft. The magnitude range of the supersonic speed is 2 times larger than the subsonic speed. This method can also study the sensitivity of other aerodynamic derivatives such as m_z ~ φ, m_ (zo) to the aircraft’s balancing resistance.