航空学报
航空學報
항공학보
ACTA AERONAUTICA ET ASTRONAUTICA SINICA
2010年
2期
217-222
,共6页
王翼%范晓樯%何继宏%陈逖%梁剑寒%王振国
王翼%範曉檣%何繼宏%陳逖%樑劍寒%王振國
왕익%범효장%하계굉%진적%량검한%왕진국
高超声速%进气道%侧板构型%启动性能%自由射流%数值模拟
高超聲速%進氣道%側闆構型%啟動性能%自由射流%數值模擬
고초성속%진기도%측판구형%계동성능%자유사류%수치모의
hypersonic%inlet%sidewall geometry%starting characteristics%free-jet%numerical simulation
对侧板前掠和侧板后掠两种构型的二维高超声速进气道开展了自由射流试验和数值模拟,考察了侧板构型对进气道启动性能的影响.结果表明,侧板前掠进气道的启动性能要明显优于后掠构型.通过对壁面压力分布、油流试验和数值模拟结果进行分析,发现侧板后掠进气道不启动流场大规模流动分离位于底板一侧,而前掠侧板对底板附近的流动分离具有限制作用,使得前掠构型不启动流场大规模分离形成于外罩一侧.外罩一侧边界层更薄,抵抗反压能力更强,更不容易发生分离,这正是造成前掠构型启动性能更优的原因.
對側闆前掠和側闆後掠兩種構型的二維高超聲速進氣道開展瞭自由射流試驗和數值模擬,攷察瞭側闆構型對進氣道啟動性能的影響.結果錶明,側闆前掠進氣道的啟動性能要明顯優于後掠構型.通過對壁麵壓力分佈、油流試驗和數值模擬結果進行分析,髮現側闆後掠進氣道不啟動流場大規模流動分離位于底闆一側,而前掠側闆對底闆附近的流動分離具有限製作用,使得前掠構型不啟動流場大規模分離形成于外罩一側.外罩一側邊界層更薄,牴抗反壓能力更彊,更不容易髮生分離,這正是造成前掠構型啟動性能更優的原因.
대측판전략화측판후략량충구형적이유고초성속진기도개전료자유사류시험화수치모의,고찰료측판구형대진기도계동성능적영향.결과표명,측판전략진기도적계동성능요명현우우후략구형.통과대벽면압력분포、유류시험화수치모의결과진행분석,발현측판후략진기도불계동류장대규모류동분리위우저판일측,이전략측판대저판부근적류동분리구유한제작용,사득전략구형불계동류장대규모분리형성우외조일측.외조일측변계층경박,저항반압능력경강,경불용역발생분리,저정시조성전략구형계동성능경우적원인.
Two-dimensional hypersonic inlets with a forward-swept sidewall and an aft-swept sidewall are tested experimentally and simulated numerically to examine the effect of sidewall geometry on the starting characteristics of a two-dimensional hypersonic inlet.The result shows that the forward-swept sidewall inlet exhibits significantly better capability of self-starting.The bottom wall pressure distribution,surface oil flow pattern and numerical result all reveal that the unstarted flowfield structures of the two inlets are quite different.Largescale flow separation occurs at the bottom wall side in the unstarted flowfield of an aft-swept sidewall inlet,while it is at the cowl side in the unstarted flowfield of a forward-swept sidewall inlet because of the constraint on the separation bubble by the forward-swept sidewall leading edge.The cowl side boundary layer is much thinner than the bottom wall side boundary layer and it can resist stronger reverse pressure gradient before theseparation occurred.That accounts for the fact that the forward-swept sidewall inlet has better starting characteristics.