The Performance Study Of The Turbocharger Used In Diesel Locomotives

Based on the imported turbocharger VTC254 which is in operation, considering the high altitude in the west as well as continuously speed-raising need and the characteristic of our railway diesel locomotive, in this paper 16V280 diesel engine turbocharger, especially the compressor is discussed. For example, through calculation on the match of turbocharger and diesel engine, a brand-new technology for compressor wheel is introduced. This new technology changes from the traditional method by which the induced and compressor wheel separately are designed and produced to a new one by which the one-piece compressor is designed. On the basis of this new technology and the optimum blade profile, the performance of both the compressor and the turbocharger is largely improved. Through the heating power calculation of the compressor, the analysis of the surge and the block of the compressor, the test-bed performance test of the turbocharger, the matching test of turbocharger and diesel engine, the propulsion test of the turbocharger on plateau condition, it is proved that the newly-designed compressor not only has high efficiency, but also improves the flow distribution in the high efficiency area so that the propulsion line can run through the high efficiency area.Impeller changed from two-piece to one-piece because of the good base of the technology level. A five-axis milling machine is used to manufacture the blades, which are swept back at the impeller outlet and have a trailing edge which is inclined slightly in the axial direction. The one-piece impeller can effectively reduce the by-pass loss, friction loss, etc. and improve the efficiency of the compressor as well as the performance of the diesel engine. Since the successful development of this product, there have been more than 300 sets of the similar turbocharger put into operation. With this turbocharger on high altitude area, the power of diesel engine need not be modified or less modified, which meets the charging need of the diesel locomotive in the west plateau condition in China.