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一般开口系能量方程中的功可以区分为有用功δWu和克服大气压力P_o所作功P_odV。在此基础上,结合一般开口系的熵方程导出在限定性约束条件下,不涉及化学反应和相变的一般开口系的有效能平衡方程和有效能表达式。 显然,闭口系和稳态稳定流动是一般开口系的特殊情况,因此闭口系和稳态稳定流动的有效能和有效能平衡方程是一般开口系有效能和有效能平衡方程的特殊情况。从而导出了有效能的统一表达式。 本文还举例说明一般开口系有效艇平衡方程和有效能的应用。
The general work of the opening energy equation can be divided into useful work δWu and overcome the atmospheric pressure P_o work P_odV. Based on this, the effective energy balance equation and effective energy equation of general opening system without chemical reaction and phase transition under the constraint condition are derived based on entropy equation of general opening system. Obviously, the closed system and the steady state steady flow are special cases of the general open system. Therefore, the effective energy and effective energy balance equations of the closed system and the stable steady flow are the special cases of the general open system effective and effective energy balance equations. Thus deriving a unified expression of effective power. This paper also illustrates the application of the general open-mouth effective boat balance equation and effective energy.