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欧洲运载火箭阿里安4系列有六种结构型式,第一级有4台液体推进剂主发动机,周围按0、2、4个的数量捆绑固体或液体助推器。由于发动机排气与发射台周围的气流和排气彼此之间的相互作用,会产生一些重要的热、力、声载荷。为了研究这些复杂现象,法国国家航空航天局研制了几种缩此模型,这些模型均装有发动机并采用与实际发动机相同的推进剂和工作条件。——第一系列试验是把1/20缩比模型固定在阿里安发射台比例模型上面的几种不同高度位置上。——第二系列试验是用1/40缩比模型在国家航空航天局的风洞设备上作跨音速和超音速(马赫数为3)试验,并在真空室作模拟高度为60公里飞行条件的试验。
The European carrier Arion 4 series has six types of structure, the first stage has four liquid propellant main engine, around the number of 0,2,4 bundled solid or liquid booster. Due to the interaction between the exhaust gas and the exhaust gas around the engine exhaust and the launch pad, some important thermal, force and acoustic loads are generated. To study these complex phenomena, NASA developed several reduced models, each fitted with an engine and using the same propellant and working conditions as the actual engine. - The first series of experiments fixed the 1/20 scale model at several different height positions above the Alian launch pad scale model. - The second series of experiments was conducted on a 1/40-scale model at NASA wind tunnel facilities for transonic and supersonic (Mach number 3) tests and a simulated altitude of 60 km in a vacuum chamber Test.