Supersonic Flutter Analysis Based on a Local Piston Theory

Supersonic Flutter Analysis Based on a Local Piston Theory
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基于局部活塞理论的超音速​​颤振分析

DOI:
10.2514/1.37750
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发表时间:
2009-10
期刊:
影响因子:
2.5
通讯作者:
Ye, Zheng-Yin
Ye, Zheng-Yin
中科院分区:
工程技术3区
文献类型:
--
作者:
Zhang, Wei-Wei;Zhang, Chen-An;Liu, Feng;Ye, Zheng-Yin

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DOI:10.2514/1.37750提出了一种用于预测超音速和高超音速时无粘非定常压力载荷的高效局部活塞理论。首先用欧拉方法得到定常平均流解。本文对经典活塞理论作了改进,在局部平均流场的翼型表面上局部地设置一个示教点,以获得翼型表面平均位置偏差引起的非定常压力扰动,而不需要进行非定常欧拉计算。将二维和三维非定常空气载荷和颤振预测结果与经典活塞理论和非定常欧拉方法所得结果进行比较,以评估翼型厚度、飞行马赫数和攻角以及钝前缘存在情况下的准确性和有效性范围。与经典活塞理论相比,局部活塞理论具有上级精度和更宽的适用范围,其计算时间仅为非定常欧拉方法的一小部分。
DOI: 10.2514/1.37750 A highly efficient local-piston theory is presented for the prediction of inviscid unsteady pressure loads at supersonic and hypersonic speeds. A steady mean flow solution is first obtained by an Euler method. The classical pistontheoryismodifiedtoapplylocallyateachpointontheairfoilsurfaceontopofthelocalmean flowtoobtainthe unsteadypressureperturbationscausedbythedeviationoftheairfoilsurfacefromitsmeanlocationwithouttheneed of performing unsteady Euler computations. Results of two- and three-dimensional unsteady air loads and flutter predictions are compared with those obtained by the classical piston theory and an unsteady Euler method to assess theaccuracyandvalidityrangeinairfoilthickness, flightMachnumber,andangleofattackandwiththepresenceof blunt leading edges. The local-piston theory is found to offer superior accuracy and much wider validity range compared with the classical piston theory, with the cost of only a fraction of the computational time needed by an unsteady Euler method.
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