民用飞机防冰系统笛形管热、流量分配研究

Research on Piccolo Heat and Flow Distributionof Civil Aircraft Anti-ice System

从笛形管设计原理出发,介绍了笛形管全尺寸热、流量分配计算方法,并给出了计算实例,反映笛形管在流向上热量、流量的变化。结果表明:当笛形管限流孔孔距、孔径不变时,笛形管前段由于通过流量较大,热、流量参数变化比较平稳,随着笛形管流向距离的增加,管内通过流量变小,热、流量参数变化逐渐加剧,当到达笛形管末端时,热气温度迅速下降,导致限流孔热功率随之迅速衰减;并且,同一笛形管入口压力相同时,随着入口温度的下降,热气流量逐渐增加,但每个限流孔热功率逐渐下降。

Based on the design principal of piccolo, a full scale calculation method of piccolo heat and flow distribution was advanced. A piccolo instance was demonstrated to reflect the change of the heat and flow of piccolo in the flow direction. The results show that： when the piccolo orifices diameter and interval remain the same, the heat and flow parameters of the front part piccolo change a little for the high bypass flow. With the distance along the flow direction increases, the heat and flow parameters change obviously since the bypass flow decreases. At the end part of piccolo, the temperature of hot air decreases quickly. This can reduce the heat power of each orifice quickly. When the inlet pressure of piccolo is the same, the total hot air flow will increase with the inlet temperature decreases, but the heat power of each orifice will decrease gradually.