飞机最优巡航条件的确定

续航性能是飞机的主要战术技术指标之一。从飞机巡航段航程的基本公式出发，利用导数求极值的性质，推导出确定飞机巡航爬升和平流层内最佳巡航条件的方程，证明了最优巡航马赫数出现在飞机阻力增加区段，最优巡航高度存在于飞机阻力最小处。最后以某型飞机的巡航爬升条件和平流层平飞最优马赫数和高度的确定作为算例，说明用此方法确定飞机巡航条件，将使飞机获得最大航程。

Determination of Optimal Cruise Conditions for Aircraft

Range and endurance are the major tactical and technical index of aircraft.Proceed from the basic formula of aircraft cruise range, the equations for determinating the cruise climb and the best cruise conditions in stratosphere have been reachedby making advantage of the nature of derivative.it is demonstrated that the optimalcruise Mach number occurs in the drag rise region and the optimal cruise heisht exists atthe point where the aerodynamic drag of aircraft is minimal. An example is given todeterminate the cruise climb conditions and the optimal Mach number and the optimalaltitude of level flight segment in stratosphere for a certain type of aircraft.