论文部分内容阅读
三菱重工至今在其MET废气涡轮增压器上使用的是径向直叶片压气机。虽然,径向直叶片压气机的性能是良好的,就象用于MET-S和更先进的MET-SA增压器上那样,最大效率高达85％,但是,其固有的缺点是喘振点和最大效率点非常接近。由于需要考虑安全系数,以便避免喘振,故实际的工作点变得比最大效率点约低3-4％。 通过比较表明,后弯叶片压气机的优点是,它能限制其效率偏离最大效率点并留有较大的喘振安全系数,从而使实际工作点的效率相应地得到了提高。 为此,三菱重工最近设计了增压器的高性能后弯叶片压气机,其最大压比高达4.0。
Mitsubishi Heavy Industries so far in its MET exhaust turbocharger is used radial straight blade compressor. Although radial straight vane compressors perform well as well as up to 85% efficiency for MET-S and more advanced MET-SA turbochargers, their inherent drawback is the surge point And the maximum efficiency point is very close. Since the safety factor needs to be considered in order to avoid surge, the actual operating point becomes about 3-4% below the maximum efficiency point. The comparison shows that the advantage of backward blade compressor is that it can limit its efficiency from the maximum efficiency point and leave a large surge safety factor, so that the efficiency of the actual operating point is correspondingly improved. To this end, Mitsubishi Heavy Industries recently designed turbocharger high-performance back bending blade compressor, the maximum pressure ratio up to 4.0.