Thermodynamic Analysis and Benchmark of Various Gasoline Combustion Concepts

Kulzer, André; Christ, Ansgar; Rauscher, Martin; Sauer, Christina; Würfel, Gernot; Blank, T.L.

doi:10.4271/2006-01-0231

Cited by 32 publications

(5 citation statements)

References 5 publications

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“…Therefore, HCCI is considered as a high-efficiency alternative to spark-ignited (SI) gasoline operation [1] and as a low-emissions alternative to traditional diesel compression ignition (CI) combustion [2]. However, several technical hurdles need to be overcome before HCCI can be widely implemented in production engines.…”

Section: Introductionmentioning

confidence: 99%

Comparing late-cycle autoignition stability for single- and two-stage ignition fuels in HCCI engines

Sjöberg

Dec

2007

Proceedings of the Combustion Institute

151

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The characteristics of autoignition after top-dead-center (TDC) for both single-and two-stage ignition fuels have been investigated in a homogeneous charge compression ignition (HCCI) engine. The singlestage ignition fuel was iso-octane and the two-stage ignition fuel was PRF80 (80% iso-octane and 20% n-heptane). The results show that the heat-release rate and pressure-rise rate both decrease as the combustion is retarded later into the early expansion stroke. This is an advantage for high-load HCCI operation. However, for both fuel-types, cycle-to-cycle variations of the ignition and combustion phasing increase with combustion-phasing retard. Also, the cycle-to-cycle variations are higher for iso-octane compared to PRF80. These observations can be explained by considering the magnitude of random temperature fluctuation and the temperature-rise rate just prior to thermal run-away. Furthermore, too much combustionphasing retard leads to the appearance of partial-burn or misfire cycles, but the responses of the two fuels are quite different. The different behaviors can be explained by considering the thermal and chemical state of the residual exhaust gases that are recycled from one cycle to the next. The data indicate that a partialburn cycle with iso-octane produces residuals that increase the reactivity of the following cycle. However, for the already more reactive PRF80 fuel, the partial-burn products present in the residuals do not increase the reactivity enough to overcome the retarding effect of cool residual gases. Published by Elsevier Inc. on behalf of The Combustion Institute.

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Section: Introductionmentioning

confidence: 99%

Comparing late-cycle autoignition stability for single- and two-stage ignition fuels in HCCI engines

Sjöberg

Dec

2007

Proceedings of the Combustion Institute

151

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“…The exact mass amount of each component is obtained with a thermodynamic gas exchange analysis. A more detailed description about this analysis can be found elsewhere [17, 21, 22]. The calculation was carried out with the computer program ‘GT Power’ [23] by using intake, cylinder, and exhaust pressure, exhaust temperature, geometric engine data, and information about the fuel as already known parameters.…”

Section: Introductionmentioning

confidence: 99%

Investigation of compression temperature in highly charged spark-ignition engines

Birkigt

Michels

Theobald

et al. 2011

International Journal of Engine Research

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One of the critical parameters for the occurrence of spark-knock and pre-ignition of highly charged spark-ignition (SI) engines is the compression temperature. The investigation of the compression temperature and a better understanding of the combustion behaviour inside the combustion chamber are of great importance for avoiding these phenomena and also for further downsizing of engines. Pure rotational coherent anti-Stokes Raman spectroscopy (RCARS) is an innovative tool providing information on the compression temperature by using only two small line-of-sight optical accesses on the cylinder wall. In this work, RCARS measurements were performed in motored and fired operation, and the results obtained from RCARS spectra have been used in combination with isentropic calculations to improve the accuracy of the compression temperature determination. Studies on the compression temperature by the variation of the intake temperature, the engine load, and the fuel were conducted and the influence of evaporation enthalpy on the compression temperature is discussed.

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“…Its fuel air mixture is premixed, as in a traditional SI engine, while its combustion is initiated by self-ignition, which is like a CI combustion. Therefore, HCCI is considered a high-efficiency alternative to SI engine [1] and as a low-emission alternative to CI engine [2]. However, it still faces the challenge of its operating range, difficulty in controlling the ignition timing [3,4], too high of a combustion rate at high loads [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The possibility of running homogeneous charge compression ignition in spark ignition and compression ignition small-scale engines

Chen

Tsai

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Homogeneous charge compression ignition (HCCI) is known as an advanced combustion system. Due to cost limitations, small-scale engines are not equipped with features and devices, such as variable valve timing, intake heater, etc. which facilitate HCCI combustion. This study implemented HCCI on two small-scale engines, 150 cc spark ignition (SI) and 224 cc compression ignition (CI) engines. Only minor modifications were made for keeping costs low. The compression ratio of the SI target engine was increased from 10.5 to 12.4 to enhance the compression temperature. A low-pressure injector was installed near the intake port for supplying fuel for HCCI operation both on the SI and CI target engines. From initial tests, kerosene and butanol were chosen as the major fuel for HCCI operation on SI and CI target engines, respectively. Then, a serial experiment was performed to identify methods for controlling HCCI combustion on small-scale engines. Results show that exhaust gas recirculation and blended fuel were suitable methods for controlling HCCI combustion phasing on small-scale engines and could successfully extend the torque range of HCCI combustion.

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Thermodynamic Analysis and Benchmark of Various Gasoline Combustion Concepts

Cited by 32 publications

References 5 publications

Comparing late-cycle autoignition stability for single- and two-stage ignition fuels in HCCI engines

Comparing late-cycle autoignition stability for single- and two-stage ignition fuels in HCCI engines

Investigation of compression temperature in highly charged spark-ignition engines

The possibility of running homogeneous charge compression ignition in spark ignition and compression ignition small-scale engines

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