论文部分内容阅读
一般说来,由于压缩机是压送压缩性流体,因此在高压力比的多级压缩机中,从进口到出口,叶轮压送的容积流量是变化的,所以,为了维持压缩机的效率,必须在最佳比速范围内选择相应的叶轮。为此,在需要高压力比的场合,压缩机通常应分为低压级和高压级,并在两级之间设置齿轮增速器。可是,如果在进口侧采用比速高的叶轮,并能减小叶轮外径的话,那么,就能省去齿轮增速器。传统的压缩机,即使采用三维叶轮,比速极限可达500左右,但是,日立制作所现在研
In general, since the compressor is a compressor that delivers compressive fluid, in a high-pressure ratio multistage compressor, the volume flow from the inlet to the outlet of the impeller varies from volume to volume. Therefore, in order to maintain the efficiency of the compressor, You must select the appropriate impeller at the optimum speed range. For this reason, where high pressure ratios are required, compressors should normally be divided into low pressure and high pressure stages with gear boosters being provided between the two stages. However, if the import side of the impeller using a higher speed, and can reduce the outer diameter of the impeller, then, you can save gear speed increaser. Traditional compressors, even with three-dimensional impeller, the speed limit of up to about 500, however, Hitachi is now research Institute