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中文摘要：
不对称双调压井引水系统的出现，导致传统的托马稳定断面计算公式已无法满足设计要求。通过理论推导得到引水系统小扰动特征方程，并根据霍尔维茨稳定性判据得到引水系统小扰动稳定的近似判别公式。采用了托马稳定断面公式方法和本文提出的近似判别公式方法、求解特征方程系数方法计算了某电站双调压井稳定断面，说明本文提出的判别公式方法能够比较精确地得到双调压井的稳定断面，而采用托马稳定断面公式计算双调压井稳定断面存在局限。
英文摘要：
Since new asymmetric water diversion system emerged, the traditional computational formula for Thoma stable section area has been unable to meet the design requirement. This paper formulates a characteristic equation for stability under small disturbances and obtains an approximate discriminant formula by using theoretical derivation and Hurwitz stability criterion. We show that this formula is more accurate in calculation of the stable section area of double surge tanks by comparing it with the Thoma formula and the method of characteristic equation coefficients calculation. And the Thoma formula that is suitable for single surge tank design, would produce limitational results in the calculation of the stable section area of double surge tanks.
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