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第九十六章 试车

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()在航空工业界,有句话曾经流传很广:如果说航空工业是一个国家制造业的皇冠,那么航空发动机就是皇冠上那颗最璀璨的明珠。龙腾小说ltxsba.com

航空发动机的生产研制成本都很高,因此,如何降低零件的材料成本和制造成本,而降低成本的同时又不能影响发动机的使用寿命一直是一个非常大的难。

由于技术水平所限,国内一般规定军用航空发动机涡轮部件的使用寿命为不低于2000小时,而国外军用航空发动机的使用寿命基本上在10000小时以上。

不过让钢镚来制造F119,陈新的要求只会更高。

陈新将钢锭、镍板、五氧化二钒、钛粉等材料分门别类地放在cāo作台上,对一旁正在看着这些金属材料两眼放光的钢镚道:“钢镚,上吧!”

钢榈阃罚朔艿溃骸袄隙梗次业睦玻?

说着,它身子发出咔嚓咔嚓的声音,很快如水银般化开,在不锈钢cāo作台上变成了一滩流动的液体,这滩液体仿佛活物一般朝它面前的金属材料蔓延过去。

金属材料与液体接触的瞬间,便仿佛遇到开水的冰块一般,以肉眼可见的速度飞快地融化开来。

钢镚所要制造的涡轮盘又称为“涡轮叶片盘”,外形看上去就是带扇叶的高温合金盘子组(不是发动机外面那个能看见的大叶子片的外风扇,而是后面的那些组,就是x级叶片的意思),主要负责疏导空气、预压缩等。

早期“盘子”和“扇叶”是分离的,主要依靠榫头来拼合。

上世纪70年代,美国英国苏联的涡扇等发动机都采取了“一体盘”(或整体盘)技术,美国通用公司首先完成产品化,到了80年代,F22、F35等项目促进了整体盘的发展。

涡轮叶片盘是发动机加工工艺的核心技术,基本要求是“均匀、纯粹、密致、轻巧、强忍、耐热、耐拉、耐压”,大推力的军用涡扇发动机涡轮盘普遍采用的是镍基或者钛基高温合金材料,这是当前的主流,所谓镍基、钛基其实就是合金钢的一种,就像大飞机的锂基材料等一样。

事实上,涡轮盘所用的材料不仅仅是这些,从早期的普通合金钢到后来的镍基、钛基单晶合金材料再到复合基、陶瓷基材料。

复合基材料主要是碳纤维复合基材,这个材料比较难搞,最早是英国人在50-60年代实验的,后来因为碳纤维的拉伸力太大,风扇转速一快,扇叶就变形,结果英国人投入了天价后失败。

由于错科技树,英国从此在涡扇发动机上的研究开始落后于美国人。

当然这个和一个国家的综合国力有关,美国人当时有钱有能力,同时开展N个型号N种不同技术路线的发动机研制,不怕摔跟头。

至于陶瓷基涡轮盘,这个技术难更高,代表着未来推重比达到20的航空发动机发展方向。

目前欧洲人的进展并不明朗,苏联人倒是搞过,rì本人有没有出实验室还不知道。

陈新知道的也只有美国的“综高推项目”实验了,听说效果不错。

所谓的“综高推”并不是为了研制出一款发动机,而是为了探索发动机研制技术(美国人技术领先全球,就是因为他们有几十年如一rì的大规模可持续xìng基础投入,并不仅仅为了武器型号而投资,更为了基础理论及其工程化花费了巨资),最终就是探索1:20推比的涡扇发动机的可行xìng技术。

至于中国航空工业界的科研院所有没有在搞这个项目,陈新就不是特别清楚了。

………………

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