【摘要】 如何在流体力学教学中避免较多的数学推导,让学生更多地关注原理本身的物理意义和应用是本文要探讨的问题。根据能量守恒思想直接得到伯努利能量方程,即元流中流入的机械能等于流出的机械能,而流体机械能正好是动能、位能和压能之和。与两种传统教学方法的对比中看出,该方法避开了传统功能原理应用过程的繁琐推导,同时也绕过了学生直接接触更困难的N-S方程这一障碍。从而使之易懂易学,并为流体力学教学改革和教材更新提供了更好的思路和方法。更多还原

【Abstract】 How to avoid more mathematical deduction in the teaching of fluid mechanics, to make students pay more attention to the physical meaning and application of the principle itself is the problem to be discussed in this paper. According to the idea of conservation of energy, the Bernoulli energy equation is directly obtained, that is, the inflow mechanical energy is equal to the outflow mechanical energy, and the fluid mechanical energy is just the sum of kinetic energy, potential energy and pressure energy.Compared with the two traditional teaching methods, this method avoids the tedious derivation, and also bypasses the obstacle of students’ direct contact with the more difficult N-S equation. So that, it is easy to understand and easy to learn, and provides better ideas and methods for the teaching reform of fluid mechanics and the renewal of teaching materials.更多还原