狭缝型接受孔对径向预旋系统的影响

为提高径向预旋系统温降减少系统的流动损失,运用数值模拟方法对比分析不同长宽比的狭缝型接受孔及传统直孔型接受孔对预旋系统温降流阻特性的影响。结果表明,随着狭缝长宽比在1~10范围内增加,接受孔有效流通面积增大,喷嘴出口气流流速及系统无量纲质量流量均增大;当旋转雷诺数大于2.6×106时,系统温降随着狭缝长宽比的增加而增加,总压损失随之先增加后趋于稳定。长宽比为6~10的狭缝型接受孔较传统直孔型接受孔有更高的温降及较高的压力损失。当旋转雷诺数等于7.9×106,长宽比为10的狭缝式接受孔较传统直孔接受孔系统温降系数增加36.7%,总压损失系数增加2.2%。

Influence of slit type receiver holes on radial pre-swirl system

In order to improve the temperature drop of radial pre-swirl system and reduce the flow loss of the system, numerical simulation was carried out to compare the characteristics of temperature reduction and flow losses of different aspect ratio slits with traditional straight hole type receiver holes. Results indicated that the receiver hole effective flow area increased with the slit aspect ratio increase within the range of 1-10, the flow velocity of the nozzle outlet and the dimensionless mass flow of the system also increased; when the rotational Reynolds number was bigger than 2.6×106, the temperature drop of the system increased with the increase of slit aspect ratio, the total pressure loss increased at first and then became stable gradually. The slit-type receiver holes with aspect ratio of 6-10 had much higher temperature drop and higher pressure loss than traditional receiver holes. When rotational Reynolds number was 7.9×106 and the slit type receiver holes aspect ratio was 10, the temperature drop coefficient increased by 36.7% and total pressure loss coefficient increased by 2.2% compared with the traditional straight hole receiver holes.