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| Numerical Simulation of Influences of Dual Electric Turbo Compound System on the Performance of a Marine Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2022.02.010 |
| Key Words:dual electric turbo compound system marine diesel engine low load performance transient characteristic |
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| Abstract:In order to improve the performance at low loads and transient characteristics of a traditional turbocharged diesel engine， a 1-D numerical simulation model of a marine diesel engine was developed and verified by experimental results. The dual electric turbo compound system operation strategies were proposed for the optimum fuel consumption rate， and the main performance and emissions of the optimized diesel engine was compared and analyzed. Results show that the comprehensive energy consumption of the system can reach the optimal level when the speeds of compressor and turbine under various working conditions are optimized by discrete-grid method， with restricts of limit parameters of the diesel engine. Since there are a large number of energy conversion processes in the dual electric turbo compound system， the comprehensive fuel consumption of the system at 50%， 75%， and 100% load shows an upward trend with the use of the system. But the fuel consumption of the system at 25% load is reduced by 3% compared with the traditonal turbocharger. The maximum allowable operating power of the diesel engine increases significantly at low speeds. It can increase by about 100% at speeds within the range of 400 r/min~600 r/min. In terms of transient characteristics， the time required for a diesel engine to load from 450 r/min to 1 000 r/ min is reduced from 70 s to 12 s with the use of the system. |
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