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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Study of the Variations in Cylinder-Exhaust-Gas Temperature Over Inlet Air and Operation-Input Parameters of Compression-Ignition Engines

[+] Author and Article Information
Gong Chen

Department of Mechanical Engineering,
Gannon University,
Erie, PA 16541

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 11, 2013; final manuscript received December 19, 2013; published online January 30, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(6), 061502 (Jan 30, 2014) (6 pages) Paper No: GTP-13-1409; doi: 10.1115/1.4026368 History: Received November 11, 2013; Revised December 19, 2013

Cylinder-exhaust-gas temperature (Texh) of a turbocharged compression-ignition engine indicates the levels of engine thermal loading on cylinder and exhaust components, thermal efficiency performance, and engine exhaust emissions. In consideration that Texh is affected by engine air inlet condition that primarily includes inlet air temperature (Ti) and pressure (pi), this paper studies the variation (ΔTexh) of Texh over varying the engine inlet air parameters of compression-ignition engines. The study is to understand ΔTexh with appropriate relations between the inlet parameters and Texh being identified and simply modeled. The regarded effects on Texh and ΔTexh for both naturally aspirated and turbocharged engines of this type are analyzed and predicted. The results indicate that Texh increases as Ti increases or pi decreases. The rate of variation in ΔTexh over varying Ti or pressure pi is smaller in a turbocharged engine than that in a naturally aspirated engine, as reflected from the model and results of the analysis. The results also indicate, for instance, Texh would increase approximately by ∼2 °C as Ti increases by 1 °C or increase by ∼35 °C as pi decreases by 10−2MPa, as predicted for a typical high-power turbocharged diesel engine operating at a typical full-load condition. The design and operating parameters significant in influencing ΔTexh along with varying Ti or pi are studied in addition. These include the degree of engine cylinder compression, the level of intake manifold air temperature, the magnitude of intake air boost, and the quantity of cycle combustion thermal input. As those parameters change, the rate of variation in Texh varies. For instance, the results indicate that the rate of ΔTexh versus the inlet air parameters would increase as the quantity of cycle combustion thermal input becomes higher. With the understanding of ΔTexh, the engine output performances of thermal loading, efficiency, and exhaust emissions, concerning engine operation at variable ambient temperature or pressure, can be understood and evaluated for the purpose of engine analysis, design, and optimization.

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Figures

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Fig. 1

Schematics of inlet/intake air parameters and cylinder-exhaust-gas temperature of typical compression-ignition engine

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Fig. 2

Predicted ΔTexh and ΔTexh/Texh0 versus Ti of naturally aspirated engine (Qmep = 1.65 MPa, n = 1.32, Ti0 = 25 °C)

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Fig. 3

Predicted ΔTexh and ΔTexh/Texh0 versus pi of naturally aspirated engine (Qmep = 1.65 MPa, n = 1.32, pi0 = 0.1 MPa)

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Fig. 4

Predicted ΔTexh versus Ti of turbocharged engine (Qmep = 5.5 MPa, n = 1.32, h = 0.7, Tm0/Ti0 = 1.14, pm0/pi0 = 3.4)

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Fig. 5

Predicted ΔTexh versus pi of turbocharged engine (Qmep = 5.5 MPa, n = 1.32, m = 0.4, Tm0/Ti0 = 1.14, pm0/pi0 = 3.4)

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Fig. 6

Effects of Qmep on ΔTexh over varying Ti of turbocharged engine (Tm0/Ti0 = 1.14, pm0/pi0 = 3.4, h = 0.7, CR = 15)

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Fig. 7

Effects of Qmep on ΔTexh over varying pi of turbocharged engine (Tm0/Ti0 = 1.14, pm0/pi0 = 3.4, CR = 15, m = 0.4)

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Fig. 8

Effects of Tm/Ti0 on ΔTexh with Ti varying of turbocharged engine (pm/pi0 = 3.4)

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Fig. 9

Effects of air boost ratio on ΔTexh with pi varying of turbocharged engine (Tm0/Ti0 = 1.14)

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