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Effect of Altitude Conditions on Combustion and Performance of a Multi-Cylinder Turbocharged Direct-Injection Diesel Engine
Technical Paper
2016-01-0742
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The objective of the study is to characterize combustion and performance of a multi-cylinder turbocharged direct-injection (DI) diesel engine at altitude conditions according to the International Standard Atmosphere (ISA). Experiments were performed on the 6.6-liter turbocharged DI diesel engine, a model similar to that of the Army’s Joint Light Tactical Vehicle. The engine was installed in the US Army Research Laboratory Small Engine Altitude Research Facility. Outside air temperature (OAT) and outside air pressure were independently controlled to match the ISA-OAT at selected altitude conditions: sea level, 1524, 3048, and 4572 m. The test engine is equipped with a single-stage variable nozzle turbocharger and Bosch CRIN 3 common-rail injection system. Three load conditions (i.e., low, mid, and high) were selected at 1400 rpm to investigate combustion and performance of the engine using Jet Propellant-8 (JP-8) fuel. JP-8 (now F-24) is the primary Army fuel used in most air and ground platforms. An injection timing sweep was performed at each engine load and altitude condition to characterize engine combustion for varying altitude conditions. For all experiments, brake mean effective pressure (BMEP) was held constant at each injection timing and altitude condition. The results show that engine combustion and performance were significantly impacted by the altitudes above 3048 m. Peak heat release rate increased with increasing altitudes and steeply increased at the altitudes above 3048 m. Higher-altitude operation significantly increased equivalence ratio, leading to richer combustion at the same BMEP and higher exhaust gas temperatures. Low load presented completely different reaction paths from the mid to high loads. Indicated specific fuel consumption increased by up to 8.7% at the high load, and indicated thermal efficiency decreased by as much as 8% at the same load condition. The highest efficiency point at each load and altitude condition was observed at the highest temperature at fuel injection and the shortest ignition delay injection timing.
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Citation
Szedlmayer, M. and Kweon, C., "Effect of Altitude Conditions on Combustion and Performance of a Multi-Cylinder Turbocharged Direct-Injection Diesel Engine," SAE Technical Paper 2016-01-0742, 2016, https://doi.org/10.4271/2016-01-0742.Also In
References
- Data summarized from Wikipedia https://en.wikipedia.org/wiki
- Benjumea , P. , Agudelo , J. and Agudelo , A. Effect of Altitude and Palm Oil Biodiesel Fueling on the Performance and Combustion Characteristics of a HDSI Diesel Engine Fuel 88 725 731 2009
- Wang , X. , Ge , Y. , Yu , L. and Feng , X. Comparison of Combustion Characteristics and Brake Thermal Efficiency of a Heavy-Duty Diesel Engine Fueled with Diesel and Biodiesel at High Altitude Fuel 107 852 858 2013
- Liu , S. , Shen , L. , Bi , Y. and Lei , J. Effects of Altitude and Fuel Oxygen Content on the Performance of a High Pressure Common Rail Diesel Engine Fuel 118 243 249 2014
- Feng , X. , Ge , Y. , Yu , L. and Feng , X. Effects of Altitude on the Thermal Efficiency of a Heavy-Duty Diesel Engine Energy 59 543 548 2013
- Dennis , J. Turbocharged Diesel Engine Performance at Altitude SAE Technical Paper 710822 1971 10.4271/710822
- He , C. , Ge , Y. , Tan , C. M. , Liu , Z. et al. Emission Characteristics of a Heavy-Duty Diesel Engine at Simulated High Altitudes Science of the Total Environment 409 3138 3143 2011
- Xiaoping , B. , Gengyun , Z. , and Xiaojing , Z. Predicting Vehicle Turbocharged Diesel Engine Performance at Altitude SAE Technical Paper 961826 1996 10.4271/961826
- Husaboe , T. D. , Polanka , M. D. , Rittenhouse , J. A. , Litke , P. J. et al. Dependence of a Small Internal Combustion Engine's Performance on Altitude AIAA Journal 30 1328 1333 2014
- Lizhong , S. , Yungang , S. , Wensheng , Y. , and Junding , X. Combustion Process of Diesel Engines at Regions with Different Altitude SAE Technical Paper 950857 1995 10.4271/950857
- ICAO Manual of the Icao Standard Atmosphere DSU Montreal, Quebec, Canada 1993