大坝与安全
大壩與安全
대패여안전
LARGE DAM & SAFETY
2014年
1期
6-8
,共3页
沿程糙率系数%断面面积%水力半径
沿程糙率繫數%斷麵麵積%水力半徑
연정조솔계수%단면면적%수력반경
roughness coefficient%section area%hydraulic radius
就锦屏二级电站引水隧洞,根据实测水头损失、反算沿程水头损失糙率系数过程中的一些经验和认识进行总结,提出了:(1)应尽量选取局部损失所占比例较小的洞段来计算沿程水损,并应计入测点底部流速头,以提高计算精度;(2)在引水隧洞平均水力半径的计算过程中,不能采用等动量或者等体积的方法,必须遵循水损相等的原则进行当量等观点,供参考。
就錦屏二級電站引水隧洞,根據實測水頭損失、反算沿程水頭損失糙率繫數過程中的一些經驗和認識進行總結,提齣瞭:(1)應儘量選取跼部損失所佔比例較小的洞段來計算沿程水損,併應計入測點底部流速頭,以提高計算精度;(2)在引水隧洞平均水力半徑的計算過程中,不能採用等動量或者等體積的方法,必鬚遵循水損相等的原則進行噹量等觀點,供參攷。
취금병이급전참인수수동,근거실측수두손실、반산연정수두손실조솔계수과정중적일사경험화인식진행총결,제출료:(1)응진량선취국부손실소점비례교소적동단래계산연정수손,병응계입측점저부류속두,이제고계산정도;(2)재인수수동평균수력반경적계산과정중,불능채용등동량혹자등체적적방법,필수준순수손상등적원칙진행당량등관점,공삼고。
Calculation method for roughness coefficient of water conveyance tunnel in JinpingⅡhydro-power station is summarized in this paper. Two viewpoints are presented:(1) in order to improve the cal-culation accuracy, we should select the section of tunnel where local loss is smaller to calculate rough-ness coefficient and the bottom velocity head should be included;(2) during the calculation of average hydraulic radius of the diversion tunnel, the method of equal volume or equal momentum cannot be used. The principle of equal equivalent water loss should be followed.