调压井托马临界稳定断面计算补充因素修正

Research on Correction of Surge Shaft Thomas Critical Stable Section

对托马临界稳定断面计算补充电力系数、底部流速水头、水轮机效率变化等因素,采用加敦公式对托马临界稳定断面补充因素进行修正,并采用数学模型计算论证加敦公式计算临界稳定断面补充因素修正的合理性。结果表明:托马临界稳定断面计算补充电力系数、底部流速水头、水轮机效率变化等因素更为合理,机组转速、蜗壳压力和尾水管压力在安全可靠、经济合理范围内,加敦公式计算调压井的临界稳定断面是可行的。

Through Thomas critical stable sectional power coefficient,the bottom velocity head support water turbine efficiency changes and other factors correction,correction of various factors on the basis of the supplement,the London formula of Thomas critical stable section sup-plement comprehensive factors correction and calculation demonstration in London formula bymathematical model of critical stable sectional rationality.The results show that the critical section Thomas supplementary power coefficient,the bottom velocity head support water turbine efficiency changes and other factors on the fluctuations in the water surge tank is beneficial to reduce the critical stable sectional area of surge shaft.The unit speed,volute pressure and tail pipe pressure are in the safe,reliable,economic and reasonable range,so the calculation for-mula of critical stability and pier surge tank area is feasible.