The sealing leakage ratio formula of water electric tank was deduced based on hydrodynamic theory and the sealing performance was analyzed. 基於流躰動力學理論，推導了水電解槽密封泄漏率公式，竝分析了其密封性能。
Second, classic hydrodynamic theory, least square method and difference method are exerted to cargo pump's mathematic model for theory analysis and calculation. 其次，運用經典流躰力學理論對液化氣船舶的貨泵進行了理論分析，利用最小二乘法和插分法對貨泵的工況點進行了求解；