摘要: Most commercial transport aircraft configure the high-lift settings stepwise. The timing when the slats/flaps are deployed by the automatic system varies from the standard conventional approach. In the standard procedure, the airs... 展开 Most commercial transport aircraft configure the high-lift settings stepwise. The timing when the slats/flaps are deployed by the automatic system varies from the standard conventional approach. In the standard procedure, the airspeed is reduced to the maximum allowable speed of the next slat/flap configuration, then the pilot commands the next higher slat/flap setting. Thus, most of the time the aircraft does not fly in its optimal aerodynamic configuration, when it maneuvers in the terminal area during approach. This paper describes the development of two different slat/flap deployment functions to optimize the landing approach in terms of fuel consumption. The effects of a high-lift system with continuously moving slats and flaps and with an automatic stepwise system are investigated. Different wind scenarios and different airspeed schedules are simulated and discussed. The investigated high-lift system with continuously moving high-lift devices automatically adapts the slat/flap setting based on the airspeed and aircraft mass and enables the aircraft to fly in an aerodynamic configuration close to optimum with minimal power. The automatic system is optimized on an approach with a previously set stabilization height, i.e. the height where an a priori defined low velocity for landing must be reached and no configuration change is needed. The simulation comparisons showed that the automatic slat/flap function is beneficial, when there are no airspeed restrictions and the aircraft can configure correspondingly to its optimal airspeed schedule, resulting in a similar fuel saving than the continuous function. However, in high-density traffic scenarios with strict airspeed commands by ATC to guarantee safe spacing between two aircraft, the continuous function should be employed instead. 收起