Homogeneous Charge Compression Ignition (HCCI) Using Isooctane, Ethanol and Natural Gas - A Comparison with Spark Ignition Operation

Christensen, Magnus; Johansson, Bengt; Einewall, Patrik

doi:10.4271/972874

Cited by 327 publications

(147 citation statements)

References 7 publications

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“…Our own earlier research on HCCI showed that the indicated efficiency was much higher with HCCI than with SI operation at part load [12]. Very little NO X was generated with HCCI, but HCCI generated about twice the amout of HC.…”

Section: Introductionmentioning

confidence: 99%

Supercharged Homogeneous Charge Compression Ignition

Christensen¹,

Johansson²,

Amnéus

et al. 1998

SAE Technical Paper Series

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297

150

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The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the reciprocating engine. Here, a homogeneous charge is used as in a spark ignited engine, but the charge is compressed to auto-ignition as in a diesel. The main difference compared with the Spark Ignition (SI) engine is the lack of flame propagation and hence the independence from turbulence. Compared with the diesel engine, HCCI has a homogeneous charge and hence no problems associated with soot and NO X formation. Earlier research on HCCI showed high efficiency and very low amounts of NO X , but HC and CO were higher than in SI mode. It was not possible to achieve high IMEP values with HCCI, the limit being 5 bar. Supercharging is one way to dramatically increase IMEP. The influence of supercharging on HCCI was therefore experimentally investigated. Three different fuels were used during the experiments: isooctane, ethanol and natural gas. Two different compression ratios were used, 17:1 and 19:1. The inlet pressure conditions were set to give 0, 1 or 2 bar of boost pressure. The highest attainable IMEP was 14 bar using natural gas as fuel at the lower compression ratio. The limit in achieving even higher IMEP was set by the high rate of combustion and a high peak pressure.Numerical calculations of the HCCI process have been performed for natural gas as fuel. The calculated ignition timings agreed well with the experimental findings. The numerical solution, is however, very sensitive to the composition of the natural gas.

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Section: Introductionmentioning

confidence: 99%

Supercharged Homogeneous Charge Compression Ignition

Christensen¹,

Johansson²,

Amnéus

et al. 1998

SAE Technical Paper Series

Self Cite

297

150

View full text Add to dashboard Cite

show abstract

“…The low heating value of lean mixtures and the high heat capacity of EGR can lower the maximum temperature of combustion, which therefore reduces the NOx emission. Up to 95% reduction in NOx emission has been achieved experimentally [83,84]. At low load, the combustion efficiency is the most important one in HCCI combustion which is increased by EGR [85].…”

Section: Exhaust Gas Recirculation (Egr)mentioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Combustion Engine- A Review

Kumar¹,

Rehman²

2014

IOSRJMCE

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“…It also another significant research purposes to combine the advantages of HCCI combustion mode using alternative renewable oxygenated fuels. Tongroon et al [12] found that methanol showed fastest and earliest auto-ignition, followed by ethanol using optical methods investigated in HCCI combustion mode .Christensen et al [13] used a lean air-fuel mixture for HCCI engine that operated unthrottled, producing an ultra-low NO x emission result.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling on homogeneous charge compression ignition combustion engine fueled by diesel-ethanol blends

et al. 2016

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Abstract. This paper investigates the performance and emission characteristics of HCCI engines fueled with oxygenated fuels (ethanol blend). A modeling study was conducted to investigate the impact of ethanol addition on the performance, combustion and emission characteristics of a Homogeneous Charge Compression Ignition (HCCI) engine fueled by diesel. One dimensional simulation was conducted using the renowned commercial software for diesel and its blend fuels with 5% (E5) and 10% ethanol (E10) (in vol.) under full load condition at variable engine speed ranging from 1000 to 2750 rpm with 250 rpm increment. The model was then validated with other researcher's experimental result. Model consists of intake and exhaust systems, cylinder, head, valves and port geometries. Performance tests were conducted for volumetric efficiency, brake engine torque, brake power, brake mean effective pressure, brake specific fuel consumption, and brake thermal efficiency, while exhaust emissions were analyzed for carbon monoxide (CO) and unburned hydrocarbons (HC. The results showed that blending diesel with ethanol increases the volumetric efficiency, brake specific fuel consumption and brake thermal efficiency, while it decreases brake engine torque, brake power and brake mean effective pressure. In term of emission characteristics, the CO emissions concentrations in the engine exhaust decrease significantly with ethanol as additive. But for HC emission, its concentration increase when apply in high engine speed. In conclusion, using Ethanol as fuel additive blend with Diesel operating in HCCI shows a good result in term of performance and emission in low speed but not recommended to use in high speed engine. Ethanol-diesel blends need to researched more to make it commercially useable.

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Homogeneous Charge Compression Ignition (HCCI) Using Isooctane, Ethanol and Natural Gas - A Comparison with Spark Ignition Operation

Cited by 327 publications

References 7 publications

Supercharged Homogeneous Charge Compression Ignition

Supercharged Homogeneous Charge Compression Ignition

Homogeneous Charge Compression Ignition (HCCI) Combustion Engine- A Review

Numerical modeling on homogeneous charge compression ignition combustion engine fueled by diesel-ethanol blends

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