An experimental investigation of the effects of cyclic transient loads on a turbocharged diesel engine. (1st January 2017)

• Record Type: Journal Article
• Authors: Yum, Kevin Koosup; Lefebvre, Nicolas; Pedersen, Eilif
• Is Part Of: Applied energy. Volume 185:Part 1(2017)
• Page Start: 472
• Page End: 481
• Publication Date: 2017-01-01
• Subjects: Transient load -- Turbocharged diesel engine -- Efficiency -- NOx emissions; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2016.10.138
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: The effects of cyclic loads on the BSFC and NOx emissions of a CI engine are investigated. Compared to static loads, the largest deviations are 6.7% and 9.1%, respectively. For the quasi-steady estimations, the largest errors are 2.9% and 4.3%, respectively. The effects primarily depend on the average load level. The quasi-steady estimations show good results except for a low load with high frequency. Abstract: This paper presents the results of the experimental investigation on the effect of cyclic transient loads on a turbocharged diesel engine with respect to fuel efficiency and NOx emissions. The transient loads in this test program are time varying torque in the form of a sinusoidal wave with a fixed amplitude at different frequencies and different mean values. The measurements from the transient tests are compared to the cases of constant loads and to estimations provided by a quasi-steady mapping. The largest influences are found at the lowest mean load (24.6%) and the highest frequency (0.2 Hz). For fuel efficiency, the transient deviation is 6.7%, while the estimation error is −2.9%. For NOx measurement in volume fraction, they are −9.1% and 4.3%, respectively. The results also show that the magnitude of the effect grows as the mean power load decreases. Finally, a graphical method is presented to evaluate the effect of load shifting operations for a diesel engine using the steady-state fuel consumption rate curve.