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从流体动力学出发，应用动量定理研究汽轮机直叶片由于间隙引起的气流激振力问题，综合考虑了叶片的各项设计参数并应用理论分析的方法导出普遍适用的计算公式，解决了Ａｌｆｏｒｄ公式中需人为选取效率系数的困难。通过与Ａｌｆｏｒｄ公式计算结果的对比计算表明该计算公式是正确的，计算结果是可信的。
Starting from the hydrodynamics, the momentum theorem is used to study the airflow excitation force caused by the gap in the turbine blades. The design parameters of the blades are comprehensively considered and the general calculation formulas are derived by theoretical analysis. Difficulties in choosing efficiency factor artificially. Comparisons with Alford formula results show that the formula is correct and the calculation result is credible.