民机起飞跑道限制重量的影响因素分析

Analysis on Factors Influencing Field Limit Weights of Civil Aircrafts

场道条件是最大起飞重量的主要限制因素之一,为了深入理解场道条件对最大起飞重量的限制并为起飞性能分析提供依据,对跑道限制重量的影响因素进行了研究。对跑道限制重量的影响因素进行了分类,给出了跑道限制重量确定方法,并依据此方法以某型民用运输机为例确定了不同情况下的跑道限制重量;分析得到了跑道长度、气压高度和大气温度对跑道限制重量的影响规律。研究表明:随大气温度升高跑道限制重量分两段线性下降,且先下降慢,后下降快;随气压高度的降低和跑道长度的增长,跑道限制重量明显增大;在较长跑道长度和较低气压高度时,跑道限制重量的温度影响范围减少。

In order to deeply understand the limitation of runway conditions on the maximum take-off weight（MTOW）and in order to provide basis for takeoff performance analysis,field limit weight（FLW）is analyzed because it is an important factor influencing MTOW. Firstly,the influence factors of FLW were classified and the method to determine MTOW was provided.Secondly,by this method the FLWs in varied conditions were determined for a civil transporter and the law how the runway length,pressure altitude and outside air temperature（OAT） influence FLW was analyzed. The result shows that： the field weight limit decreases first slowly and then sharply with increasing outside air temperature; the decrease of pressure altitude or the increase of runway length results a more field limit weight; in the lower air pressure altitude and the longer runway,the temperature range influencing field limit weight reduces.