圆管型与叶栅型去旋喷嘴流动对比分析

Comparative Analysis of Flow between Tube Typed and Cascade Typed De-Swirl Nozzles

关键词:  去旋喷嘴  共转盘腔  径向内流  数值模拟  压力损失

Key words:  De-swirl nozzle  Co-rotating cavity  Radial inflow  Numerical simulation  Pressure loss

摘要:

为了探索喷嘴结构优化对盘腔内流阻特性的影响规律,分别对去旋角度为28°的直叶栅与扩口叶栅型喷嘴下的径向内流共转盘腔在不同转速下开展数值研究,并与圆管型喷嘴作对比。获得了三种结构不同工况下的流场结构、旋流比与相对总压分布图及总压损失分布曲线。研究结果表明：随着转速增加,叶栅型与圆管型喷嘴总压损失系数的变化趋势一致；直叶栅与扩口叶栅的系统总压损失系数分别比圆管显著降低40%与27%以上；直叶栅与扩口叶栅喷嘴内的流场结构相似,喷嘴总压损失系数相近,且都随转速增大而缓慢减小。

Abstract:

To research the effects on drag reduction performance of the optimization of the de-swirl nozzle, both straight cascade and flared cascade with de-swirl angle of 28°were numerically simulated calculate the radial inflow of gas in co-rotating disc cavities under different rotational speeds and compared with tube nozzle. The flow structures, relative total pressure distribution and the diagrams of total pressure loss under varied condition were obtained. The trend of the total pressure loss coefficient of the cascade and tube nozzle is the same with the increase of the rotational speeds. The total pressure loss coefficient of the straight cascade and flared cascade nozzle are decreased by more than 40% and 27%, compared with that of the tube nozzle. The flow structure in the straight cascade and flared cascade nozzle is similar, the total pressure loss coefficient of the nozzle is similar, and both decrease slowly with the increase of the rotational speeds.