【作者】

Jiri Klima,Vladimir Hort,Markus Haidn

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 New, stricter emission limits and engine development are continuously increasing the requirement to boost pressure level. Turbocharger manufacturers have been trying to fulfill this requirement by increasing the maximum pressure ratio of single-stage compressors, until material limits were achieved. The situation changed when engines with Miller timing were put into operation and showed their potential for additional emission reductions. As a consequence, a pressure ratio well above 6 was required. This was the impulse to start thinking about multistage com-pression with intercooling. From the start, the requirements of potential customers were included into the design. Based on application investigations, it was decided to keep the low pressure unit inside the standard product portfolio and develop a new high pressure turbocharger according to the special requirements. In reference to market potential, a medium size unit was chosen to be designed and tested as a pilot version. Highest efficiencies at low pressure ratios and increased mass flow capacities corresponding to high engine power density, together with higher mechanical load, were a considerable challenge in developing a new turbocharger. After the initial study, which de-fined operating conditions and ranges, the new com-pressor and turbine were designed using advanced CFD and FE tools. Some well-proven concepts from NR/S and TCR turbochargers were adopted for the project. The best versions were built by rapid prototyping methods and tested separately on compressor and turbine test benches. Simultaneously with production of prototypes, a new two-stage turbocharger test bench has been prepared capable of pressure levels up to 11 bar g, for which more sophisticated controls have been installed. The measuring system was up-graded for two-stage group measurements as well. The test of the main parameters confirmed the reliability of the design and thermodynamic expectations. Based on single stage and two-stage configuration measurements, a significant increase in the efficiency of the turbocharging system compared to just one stage was recorded. Special component tests were performed as well. In recent years, the TCX 14has been developed as the basis of a new series of high pressure turbochargers for two-stage turbocharging, suitable for the upcoming generation of reciprocating engines. The turbocharger performance fully covered the planned range and confirmed the potential of two-stage turbocharging to achieve charging group efficiencies far above max. single stage figures. PBSTurbo,a member of the MAN group, is ready to provide the new technology-comprising TCX as high pressure and TCR/TCA as low pressure turbochargers. In the paper the development steps are presented, with main focus on the TCX design features including comprehensive results of the component validation as well as test data in single stage and two-stage configuration.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

5

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