翼身融合布局机体对发动机进气品质影响

Influence of Airframe on Engine Inlet flow Quality of Blended Wing Body

为评估发动机安装后,机体是否对发动机进气存在不利影响,本文通过数值模拟方法,研究了高低速情况下BWB300机体对发动机进气品质的影响。结果表明:高速情况下,发动机前高速气流能完全满足BWB300进气需求,故BWB300机体不会对发动机进气品质造成明显影响;而低速时,由于发动机进气流量需求大且其前方气流流速低,机体表面若存在流动分离,分离气流会较易被发动机吸入,从而降低其进气品质。故对类似BWB300的上置式发动机布局飞机而言,飞发一体化设计时应避免机体表面流动分离首先发生在发动机位置附近处。

In order to evaluate whether the body has an adverse effect on the engine inflow after the engine is installed,the influence of the BWB300 body on the engine inflow quality at high and low speeds is studied by using the numerical simulation.The results show that at high speed,the influence of the BWB300 body on the engine inlet flow quality is very small,because of the high speed flow at the front of the engine can fully meet the BWB300 intake demand;while at low speed,due to the large engine mass flow inlet demand and the airflow speed is low at the front of engine,if there is flow separation on the surface of the body,the separated flow will be more easy sucked in by the engine,thus reducing its inlet flow quality.Therefore,for the upper mounted engine layout aircraft like BWB300,the engine-airframe integration design should try to avoid the flow separation on its upper surface occurring near the engine location.