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一种射流式冷却挡焰板的气动设计与数值分析 预览

Aerodynamic design and numerical analysis of jet cooling blast deflector
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摘要 [目的]目前,美、俄两国航空母舰的挡焰板均采用海水冷却系统,虽然水冷效果较好,但存在管路复杂、维修和维护不便等问题。因此,[方法]借鉴涡轮叶片气膜冷却的方式,利用气体射流可以带走和隔离发动机高温尾喷流的特点,提出不依赖冷却水的射流冷却式挡焰板方案。对挡焰板上形成冷却气膜的射流槽位置和开孔数进行研究,运用CFD方法对采用不同射流孔方案的挡焰板温度等指标进行计算,并对其冷却效果进行对比分析,以验证该方案的可行性。[结果]结果表明,射流冷却方式可将挡焰板上95%表面核心区的平均温度降至可接受的范围。[结论]该隔热冷却方式效果显著,可有效实现对挡焰板的热防护。所提设计方案和数值分析方法对新型挡焰板方案及冷却方式设计具有一定的借鉴作用。 [Objectives]At present,seawater cooling jet blast deflectors are used on American and Russian aircraft carriers to protect crew and equipment from aircraft engine blasts.Although seawater cooling is effective,seawater cooling jet blast deflectors require such complex facilities as pumps and pipelines,making their maintenance inconvenient.[Methods]With reference to the principle of film cooling on turbine vanes,this paper propose an alternative design of jet cooling for the blast deflector,using jet flows to remove and isolate high temperature flows from engine blasts.The location of slot and quantity of hole designed for film cooling on the deflector are investigated.The calculation of temperature and pressure on the deflector with different options of jet hole are made by CFD method,the cooling effect by this approach is then analyzed and validated.[Results]The calculation results show that the jet cooling effects are equivalent to those of seawater cooling jet blast deflectors,and can reduce the average temperature of the 95% core area to acceptable levels.[Conclusions]The jet flow cooling method is generally effective in achieving heat isolation.This numerical analysis and design method can be helpful in the research and design of passive jet blast deflectors.
作者 颜世伟 晋文超 谭大力 田云 Yan Shiwei;Jin Wenchao;Tan Dali;Tian Yun(Naval Research Academy,Beijing 100161,China;National Lab for Aeronautics and Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)
出处 《中国舰船研究》 CSCD 北大核心 2019年第2期99-106,共8页 Chinese Journal of Ship Research
关键词 航空母舰 射流冷却 喷气偏流板 数值分析 aircraft carrier jet cooling jet blast deflector numerical analysis
作者简介 颜世伟,男,1982年生,博士生,工程师。研究方向:飞行器设计,航空保障特种装置,舰机适配性。E-mail:2365215@163.com;通信作者:田云,男,1984年生,博士,讲师。研究方向:飞行器设计,计算流体力学。E-mail:tianyun@buaa.edu.cn.
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