风冷柴油机高原恢复功率的模拟计算与实验

研究柴油机恢复功率对提高高海拔地区涡轮增压柴油机的性能具有重要意义。使用模拟计算程序和模拟实验台对风冷BF8L413F增压中冷柴油机进行了海平面和高原的模拟计算与实验。提出了两种恢复功率技术方案:一种方案是把涡轮流通截面由16cm2减小到11cm2,另外一种方案是在减小涡轮流通面积的同时采用可调涡轮。模拟实验结果表明,高海拔对柴油机性能有很大影响;模拟计算结果表明,这两种方案均能把柴油机在海拔4.5km的功率恢复到海平面功率的85%水平。

Numerical and experimental investigation of turbocharged diesel engine power recovery at high altitudes

The performance of turbocharged diesel engine at high altitudes can be improved by improving the power recovery of diesel engines at high altitudes. In this work, the performance of an air cooled diesel engine with a turbocharger and cooler system was investigated experimentally and analytically at sea level and high altitudes. Two methods were developed to improve the power recovery. One method reduced the turbine through-flow area from 16 cm~2 to 11 cm~2. The other method was to design a variable geometry turbocharger system. The experimental results show that the high altitudes greatly influence the engine performance. The simulation results show that both methods can improve the diesel engine performance at high altitudes and realize the target of obtaining 85% of the sea-level power at 4 500 m.