翼身融合民机背撑发动机安装效应对推力影响研究

doi:10.13675/j.cnki.tjjs.190024

推进技术 ›› 2020, Vol. 41 ›› Issue (2): 260-267.DOI: 10.13675/j.cnki.tjjs.190024

翼身融合民机背撑发动机安装效应对推力影响研究

顾文婷¹,陈迎春²,陈真利¹,桑为民¹,张彬乾¹

1.西北工业大学航空学院，陕西西安 710072;2.中国商用飞机有限公司上海飞机设计研究院，上海 200120

发布日期:2021-08-15
作者简介:顾文婷，博士生，研究领域为飞行器气动布局设计与数值模拟。E-mail： waiinggu@mail.nwpu.edu.cn

Investigation of Engine Installed Effect on Thrust of Blended Wing Body Transport with Podded Engines

1.School of Aeronautics,Northwestern Polytechnical University, Xi’an 710072, China;2.Shanghai Aircraft Design and Research Institute,Commercial Aircraft Corporation of China Limited, Shanghai 200120, China

Published:2021-08-15

摘要/Abstract

摘要： 针对背撑发动机布置的翼身融合布局(Blend wing body,BWB)民机，为了研究机体对发动机周围流场的干扰和安装效应对有效推力的影响，通过对单独发动机短舱和飞机-发动机安装状态三维流场进行数值模拟，采用推阻力划分方法提取安装和非安装状态下发动机推阻力相关参数，获得了巡航状态和低速12°迎角状态下发动机安装效应对背撑式BWB民机推力的影响规律。结果表明：高速巡航状态，机体对发动机表面压力分布的影响导致短舱外表面吸力降低，发动机阻力增大是造成有效推力损失的主要原因；低速12°迎角状态，内、外涵喷流受机体流动影响压力降低，引起内推力减小，其降低量占有效推力安装效应影响的比例约95%，且机体边界层和分离流动并未影响发动机进气品质。在背撑式BWB民机设计中，需要考虑不同飞行状态下BWB机体对安装状态发动机流场的干扰，减小安装效应对有效推力的影响。

关键词: 翼身融合布局;背撑发动机;安装效应;推力损失;有效推力

Abstract: To investigate the airframe flow interaction on flowfield around engine nacelles and the installed effect on effective thrust of the blend wing body (BWB) transport with podded engines, the numerical method was applied to simulate the three-dimensional flowfield of the isolated and installed configuration. The thrust and drag related parameters of the isolated and installed nacelles were obtained by the thrust drag bookkeeping. The influence of engine installation effect on thrust components of the podded BWB transport was achieved at cruise and low speed condition with 12° angle of attack. The results indicate that the major reason for effective thrust loss at cruise condition is the increment of nacelle drag due to the reduction of suction force on the nacelle external surface. At low speed condition with 12° angle of attack, the decrease of pressure at fan and core nozzle exit causes the reduction of installed net thrust, which accounts for about 95% of the effective thrust loss. Meanwhile, the quality of engine intake flow is not affected by boundary layer flow and separation flow. In the design of podded BWB transport, the interference of airframe on installed nacelle should be taken into account at different flight conditions to reduce the influence of installed effect on effective thrust.

Key words: Blend wing body configuration;Podded engines;Installed effect;Thrust loss;Effective thrust

顾文婷,陈迎春,陈真利,桑为民,张彬乾. 翼身融合民机背撑发动机安装效应对推力影响研究[J]. 推进技术, 2020, 41(2): 260-267.

GU Wen-ting¹,CHEN Ying-chun²,CHEN Zhen-li¹,SANG Wei-min¹,ZHANG Bin-qian¹. Investigation of Engine Installed Effect on Thrust of Blended Wing Body Transport with Podded Engines[J]. Journal of Propulsion Technology, 2020, 41(2): 260-267.

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翼身融合民机背撑发动机安装效应对推力影响研究

Investigation of Engine Installed Effect on Thrust of Blended Wing Body Transport with Podded Engines

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