某型飞机高原机场起飞滑跑距离的分析和计算

Analysis and Calculation of Aircraft Taking-off Running Distance on Plateau Airport

与平原机场相比,高原机场环境空气稀薄,飞机发动机推力减损,起飞离地速度增加,导致高原机场飞机起飞滑跑距离大幅度增加。本文分析了飞机发动机静态推力、升力、阻力和起飞离地速度随海拔升高的变化特性,根据发动机推力数据库的起飞状态推力数据拟合发动机推力随海拔高度、速度变化的曲面,将发动机推力和升阻力系数表示为速度的函数。采用解析积分法计算某型飞机在高原机场的起飞滑跑距离,并与实际起飞滑跑距离进行比较,发现计算值与实际值绝对误差在50 m范围内,能够为某型飞机高原机场的跑道长度设计计算提供理论参考。

Comparing with plain area,the air of plateau environment is thin and the thrust of the aircraft engine detracts,the take-off speed increases,and the taking-off running distances increase largely.This paper analyzes the static thrust,the lift-resistance and the degree of take-off speed change with increasing of elevation.According to fitting the surface of thrust changing with elevation and velocity based on the taking-off condition date,it expresses the thrust and lift-resistance coefficient of engine as speed function.The taking-off running distances on Plateau Airport which calculated by analytic integral method will be compared with actual taking-off running distances.Based on the comparative analysis,it can be found that the absolute error between calculated and realistic value keep within the limits of 50 meters.Above all,the conclusion of the paper can provide references for the design of runway length on plateau.