笛形管结构参数对热气防冰凹腔表面温度分布的影响

Influence of Piccolo Tube Parameters on Temperature Distribution on Hot-Air Anti-icing Concave Surface

运用数值模拟方法,研究了笛形管射流孔直径、射流孔间距、周向位置和笛形管位置等结构参数对凹腔表面温度的影响。研究结果表明:在本文所研究的结构参数范围内,笛形管射流孔直径对凹腔前缘表面的温度影响最大,不同孔径的热射流加热效率相对差值达7%。存在一定的射流孔间距范围,使得凹腔表面温度得到一较优值,其对热射流加热效率的影响幅度在4%左右。笛形管周向射流孔安装角为±35°时,凹腔前缘的热射流加热效率相对较高,笛形管中心接近于凹腔前缘可以取得更好的热射流加热效果,但其对热射流加热效率的影响仅在2%以内。

To investigate the influence of piccolo tube parameters on temperature distribution on a con- cave surface, a numerical simulation is performed considering the external and internal flows. The effects of jet-hole diameter, jet-to-jet spacing, circumferential orifice location, jet-hole arrangement, and piccolo tube position on the concave surface temperature distribution are analyzed. Results show that the jet-hole diameter has the greatest influence on the temperature distribution in the vicinity of concave leading edge among the presented research parameters. The relative difference of hot jet heating efficien- cy among different jet-hole diameters reaches about 7 %. There is an optimal value of jet-to-jet spacing at which the concave surface temperature distribution is more reasonable. The influence of jet-to-jet spac- ing on the hot jet heating efficiency is about 4%. When the piccolo circumferential holes are located at 35%, the hot jet heating efficiency in the vicinity of concave leading edge is relative higher. Also, when the piccolo tube is located close to the concave leading edge, the hot jet heating efficiency could be im- proved. However, the influence of either piccolo circumferential orifice location or the piccolo tube loca- tion on the hot jet heating efficiency is limited within 2%.