Crank angle-resolved exergy analysis of exhaust flows in a diesel engine from the perspective of exhaust waste energy recovery

Mahabadipour, Hamidreza; Srinivasan, Koottalai; Krishnan, Sundar Rajan; Subramanian, Swami Nathan

doi:10.1016/j.apenergy.2018.02.037

Cited by 24 publications

(8 citation statements)

References 45 publications

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“…On the other hand, the mass flow rate based form accounts for the total amount of energy carried by the flow. This form has been applied to evaluate the energy utilization associated with flow devices, such as the pulsing flow exergy after exhaust valve opening [15], flow losses within the turbocharging system [16,17], and the energy efficiency of waste heat recovery systems [3,18].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Another approach for characterizing instantaneous flow energy is to integrate direct measurement with ICE flow simulation or estimation [32]. For instance, the flow exergy of exhaust pulsation is characterized, respectively, during blowdown and displacement phases of exhaust processes by Mahabadipour et al [15,33]. The evaluation of crank-angleresolved exhaust flow energy adopts pressure data from fast measurement, but the flow temperature, velocity, and other parameters still rely on 1D simulation.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Enthalpy is widely accepted to represent the flow energy based on the first law of thermodynamics. However, the enthalpy based approach in Equation (1) may not fully reflect the losses or work potential inside the flows, since it neglects the deterioration of flow energy quality [13,15]. Exergy, also known as available energy, denotes the maximum portion of flow enthalpy that can be converted to work by interacting with the surrounding conditions (also referred to as "dead state") [13].…”

Section: Flow Enthalpy and Exergymentioning

confidence: 99%

See 2 more Smart Citations

Numerical Analysis of Engine Exhaust Flow Parameters for Resolving Pre-Turbine Pulsating Flow Enthalpy and Exergy

2021

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Energy carried by engine exhaust pulses is critical to the performance of a turbine or any other exhaust energy recovery system. Enthalpy and exergy are commonly used concepts to describe the energy transport by the flow based on the first and second laws of thermodynamics. However, in order to investigate the crank-angle-resolved exhaust flow enthalpy and exergy, the significance of the flow parameters (pressure, velocity, and temperature) and their demand for high resolution need to be ascertained. In this study, local and global sensitivity analyses were performed on a one-dimensional (1D) heavy-duty diesel engine model to quantify the significance of each flow parameter in the determination of exhaust enthalpy and exergy. The effects of parameter sweeps were analyzed by local sensitivity, and Sobol indices from the global sensitivity showed the correlations between each flow parameter and the computed enthalpy and exergy. The analysis indicated that when considering the specific enthalpy and exergy, flow temperature is the dominant parameter and requires high resolution of the temperature pulse. It was found that a 5% sweep over the temperature pulse leads to maximum deviations of 31% and 27% when resolving the crank angle-based specific enthalpy and specific exergy, respectively. However, when considering the total enthalpy and exergy rates, flow velocity is the most significant parameter, requiring high resolution with a maximum deviation of 23% for the enthalpy rate and 12% for the exergy rate over a 5% sweep of the flow velocity pulse. This study will help to quantify and prioritize fast measurements of pulsating flow parameters in the context of turbocharger turbine inlet flow enthalpy and exergy analysis.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Flow Enthalpy and Exergymentioning

confidence: 99%

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Numerical Analysis of Engine Exhaust Flow Parameters for Resolving Pre-Turbine Pulsating Flow Enthalpy and Exergy

2021

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“…Mahabadipour et al [22] studied the exergy of exhaust flow in a diesel engine in an attempt to recover the waste energy. The exergetic analyze has taken place in crank-angle resolved base and it was indicated that the specific thermal exergy prevails at the primary period of the exhaust process.…”

Section: Introductionmentioning

confidence: 99%

Improved mixture quality by advanced dual-nozzle, included-angle split injection in HSDI engine: Exergetic exploration

Taghavifar

Nemati

Salvador

et al. 2019

Energy

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A Ford 1.8 l high speed diesel engine (HSDI) is utilized for a thorough investigation on split dual injection with two included-angle nozzles. The system is equipped with variablegeometry turbocharging (VGT) and high-pressure common-rail (HPCR) technologies which lets multi-injections per cycle. The share of fuel between pulses is divided in three portions of 70-30, 80-20, and 90-10 with included angles of 10, 20, and 30 while the dwell time between pulses are 5CA, 10CA, 15CA, and 20CA. The results demonstrate that the optimum option is 70 (5) 30-30deg with the best homogeneity of mixture (UI = 0.9742) and peak temperature (Tmax = 2011.58 K) that yield maximum thermo-mechanical exergy amounting to 439 J. In addition, the highest amount of accumulative irreversibility happens for 90 (10) 10-20deg. It is found that there is a relation between mixture uniformity and accumulative work/heat exergy, whereas high rate of pressure rise (RPR) contribute to irreversibility rate or exergy destruction in diesel engine, i.e. RPR (80-20) = 904.67 kPa/deg. More, the results are in agreement with literature reporting that higher in-cylinder temperature (Tmax (70 (5) 30-30deg) = 2011.58 K)) can possibly decrease the accumulative irreversibility (147.9 J).

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“…The effect of changing different parameters on the combustion and the profile of the gas pressure inside the combustion chamber has long been studied. These studies were mainly carried out by numerical simulations either using high accuracy CFD simulations (Mahabadipour et al, 2018;Shah et al, 2016) or single zone one-dimensional analysis (Mauro et al, 2018) or experimentally measuring the gas pressure using a piezoelectric sensor (Bąkowski et al, 2016;Payri et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Fatigue life assessment of crankshaft with increased horsepower

Sola

Alinejad

Rahimidehgolan

et al. 2019

IJSI

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Purpose The purpose of this paper is to analyze the fatigue life of the crankshaft in an engine with increased horsepower. Design/methodology/approach The applied load on the powertrain components was calculated through a dynamic analysis. Then, to estimate the induced stress in every crank angle, the calculated loads in different engine speeds were applied on the crankshaft. Finally, the critical plane fatigue theories in addition to URM standard were used to estimate the damage and fatigue life of the crankshaft with the increased power. Findings It was found that a simultaneous increase of gas pressure and engine speed by 30 percent will cause an increase of maximum applied load on the crankshaft by 25 percent. It was also found that while the results of finite element (FE) method predict an infinite life for the crankshaft after increasing the power, the URM method predicts an engine failure for the increased power application. In this study, the crankpin fillet is introduced as the most critical area of the crankshaft. Originality/value Increasing the power of the internal combustion engines without changing its main components has been of high interest; however, the failure associated with the increased load as the result of increased power has been a big challenge for that purpose. Moreover, although URM standard provided an efficient practice to evaluate a crankshaft fatigue life, using FE analysis may provide more reliability.

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Crank angle-resolved exergy analysis of exhaust flows in a diesel engine from the perspective of exhaust waste energy recovery

Cited by 24 publications

References 45 publications

Numerical Analysis of Engine Exhaust Flow Parameters for Resolving Pre-Turbine Pulsating Flow Enthalpy and Exergy

Numerical Analysis of Engine Exhaust Flow Parameters for Resolving Pre-Turbine Pulsating Flow Enthalpy and Exergy

Improved mixture quality by advanced dual-nozzle, included-angle split injection in HSDI engine: Exergetic exploration

Fatigue life assessment of crankshaft with increased horsepower

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