Emission Formation Study of HCCI Combustion with Gasoline Surrogate Fuels

Truedsson, Ida; Tunér, Martin; Johansson, Bengt; Cannella, William

doi:10.4271/2013-01-2626

“…The range of fuels investigated here is similar to that studied by Truedsson et al [23,[50][51][52] in their experiments on the compression ratio required for autoignition; however, unlike the current computational approach those experiments held equivalence ratio and engine speed constant. Following the general procedure first introduced by Niemeyer et al [42], we performed driving cycle simulations for a typical light-duty passenger vehicle to generate steady-state operating points in terms of engine speed and torque, and also obtained the corresponding baseline SI engine fuel consumption for these operating points.…”

Section: Introductionmentioning

confidence: 66%

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Niemeyer

¹

,

Daly

²

,

Cannella

³

et al. 2015

Fuel

View full text Add to dashboard Cite

A new metric for ranking the suitability of fuels in LTC engines was recently introduced, based on the fraction of potential fuel savings achieved in the FTP-75 light-duty vehicle driving cycle. In the current study, this LTC fuel performance index was calculated computationally and analyzed for a number of fuel blends comprised of n-heptane, isooctane, toluene, and ethanol in various combinations and ratios corresponding to octane numbers from 0 to 100. In order to calculate the LTC index for each fuel, computational driving cycle simulations were first performed using a typical light-duty passenger vehicle, providing pairs of engine speed and load points. Separately, for each fuel blend considered, single-zone naturally aspirated HCCI engine simulations with a compression ratio of 9.5 were performed in order to determine the operating envelopes. These results were combined to determine the varying improvement in fuel economy offered by fuels, forming the basis for the LTC fuel index. The resulting fuel performance indices ranged from 36.4 for neat n-heptane (PRF0) to 9.20 for a three-component blend of n-heptane, isooctane, and ethanol (ERF1). For the chosen engine and chosen conditions, in general lower-octane fuels performed better, resulting in higher LTC fuel index values; however, the fuel performance index correlated poorly with octane rating for less-reactive, higher-octane fuels.

show abstract

“…The current study builds on an earlier effort [42] that introduced a new LTC fuel performance index by determining the indices for a number of fuel blends comprised of n-heptane, isooctane, toluene, and ethanol in various combinations and ratios. The range of fuels investigated here is similar to that studied by Truedsson et al [23,[50][51][52] in their experiments on the compression ratio required for autoignition; however, unlike the current computational approach those experiments held equivalence ratio and engine speed constant. Following the general procedure first introduced by Niemeyer et al [42], we performed driving cycle simulations for a typical light-duty passenger vehicle to generate steady-state operating points in terms of engine speed and torque, and also obtained the corresponding baseline SI engine fuel consumption for these operating points.…”

Section: Introductionmentioning

confidence: 69%

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Daly¹,

Cannella²,

Hagen³

2016

Preprint

Self Cite

View full text Add to dashboard Cite

A new metric for ranking the suitability of fuels in LTC engines was recently introduced, based on the fraction of potential fuel savings achieved in the FTP-75 light-duty vehicle driving cycle. In the current study, this LTC fuel performance index was calculated computationally and analyzed for a number of fuel blends comprised of n-heptane, isooctane, toluene, and ethanol in various combinations and ratios corresponding to octane numbers from 0 to 100. In order to calculate the LTC index for each fuel, computational driving cycle simulations were first performed using a typical light-duty passenger vehicle, providing pairs of engine speed and load points. Separately, for each fuel blend considered, single-zone naturally aspirated HCCI engine simulations with a compression ratio of 9.5 were performed in order to determine the operating envelopes. These results were combined to determine the varying improvement in fuel economy offered by fuels, forming the basis for the LTC fuel index. The resulting fuel performance indices ranged from 36.4 for neat n-heptane (PRF0) to 9.20 for a three-component blend of n-heptane, isooctane, and ethanol (ERF1). For the chosen engine and chosen conditions, in general lower-octane fuels performed better, resulting in higher LTC fuel index values; however, the fuel performance index correlated poorly with octane rating for less-reactive, higher-octane fuels.

show abstract

“…19,48 Since the HCCI combustion is a type of LTC a high intake temperature (Tin) will not have a significant effect on the NOx formation and therefore would not be a limiting factor. 42,49,50 The other methods for preparation of homogeneous mixture of an HCCI combustion are injection timing, using high EGR and negative valve overlap (NVO). 48,[51][52][53][54][55] NVO method benefits from variable valve timing and traps the exhaust gases inside the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Understanding the effect of Intake temperature on the ϕ-sensitivity of toluene-ethanol reference fuels and neat ethanol

Alemahdi

¹

,

Martı́nez

²

,

Tunér

³

2022

International Journal of Engine Research

View full text Add to dashboard Cite

The low-temperature combustion (LTC) is an attractive concept that enables the modem combustion engines to move toward sustainability mainly by increasing the efficiency and decreasing the emissions. The modern combustion engines which are working based on the LTC concept have specific fuel requirements. Fuel ϕ-sensitivity is a key factor to be considered for tailoring fuels for these engines. Fuel with a high ϕ-sensitivity are more responsive to thermal or fuel stratifications; the auto-ignition properties of different air-fuel mixtures of these fuels, with different equivalence ratio (ϕ), are more diverse. This diversity provide a smoother heat release rate in stratified condition. In this study 11 different toluene–ethanol reference fuels (TERFs) in three research octane number (RON) groups of 63, 84, and 105 together with neat ethanol are evaluated. The Lund ϕ-sensitivity method is used to evaluate these fuels in a cooperative fuel research (CFR) engine. The effect of variation of intake temperature on pressure sensitivity of fuel at a constant combustion phasing is evaluated. This evaluation is performed at two intake temperature of 373 and 423 K, and the results are compared with the outcome of the Lund ϕ-sensitivity number with the intake temperature of 323 K. This study shows that the CR sensitivity response of different blends to the intake charge temperature variation depends on the fuel composition. Accumulated low temperature heat release and latent heat of vaporization. It proves that the fuel ϕ-sensitivity will vary under different thermodynamic conditions. There was a clear link between the accumulated heat released during the early reaction and CR sensitivity of the blends at different intake temperature of 373 and 423 K but the link with the latent heat of vaporization (HoV) found to be inexplicit.

show abstract

Emission Formation Study of HCCI Combustion with Gasoline Surrogate Fuels

Cited by 11 publications

References 11 publications

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Understanding the effect of Intake temperature on the ϕ-sensitivity of toluene-ethanol reference fuels and neat ethanol

Contact Info

Product

Resources

About