Experimental Investigations to Extend the Load Range of Premixed Charge Compression Ignited Light Duty Diesel Engine through Fuel Modifications

doi:10.4271/2019-01-0953

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Experimental Investigations to Extend the Load Range of Premixed Charge Compression Ignited Light Duty Diesel Engine through Fuel Modifications

Proceedings Article•DOI•

Experimental Investigations to Extend the Load Range of Premixed Charge Compression Ignited Light Duty Diesel Engine through Fuel Modifications

Saurabh Gupta¹, Anand Krishnasamy¹•Institutions (1)

Indian Institute of Technology Madras¹

02 Apr 2019-

About: The article was published on 2019-04-02. It has received 2 citation(s) till now. The article focuses on the topic(s): Diesel engine.

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Journal Article•DOI•

Prospective fuels for diesel low temperature combustion engine applications: A critical review:

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Anand Krishnasamy¹, Saurabh Gupta¹, Rolf D. Reitz²•Institutions (2)

Indian Institute of Technology Madras¹, University of Wisconsin-Madison²

01 Jul 2021-International Journal of Engine Research

TL;DR: Low Temperature Combustion (LTC) strategies are most promising to simultaneously reduce oxides of nitrogen (NOx) and soot emissions from diesel engines along with offering higher thermal efficiency as discussed by the authors.

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Abstract: Low Temperature Combustion (LTC) strategies are most promising to simultaneously reduce oxides of nitrogen (NOx) and soot emissions from diesel engines along with offering higher thermal efficiency...

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12 citations

Cites background or methods from "Experimental Investigations to Exte..."

...A major limitation of this strategy is that it can result in higher fuel impingement and cylinder wall wetting, especially, when operated with heavy distillate fuels.(72) Also, since the fuel injection event takes place after intake valve closure timing, there is less time available for fuel-air mixing and thus it causes higher NOx and soot emissions than PFI HCCI....
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...The required engine modifications to achieve early DI HCCI include a flexible common rail direct injection (CRDI) system for varying the fuel injection timings, provision for varying the compression ratio of the engine and an EGR loop for better combustion control.(72) The pros of early DI HCCI over PFI HCCI include enhanced fuel vaporization, lower mixture preparation time owing to higher in-cylinder temperatures and higher gas density at the time of fuel injection....
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...Apart from this, it allows transition from low load HCCI to high load conventional combustion.(44,72) A major limitation of this strategy is that it can result in higher fuel impingement and cylinder wall wetting, especially, when operated with heavy distillate fuels....
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...However, use of EGR can provide some degree of control over combustion phasing in this strategy.(72)...
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...Further, utilizing oxygenated fuels like butanol is also found to be beneficial to reduce unburned emissions.(72) High volatility fuels reduce smoke emissions at higher loads, and low cetane fuels result in better control over in-cylinder temperatures and lower NOx emissions....
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Journal Article•DOI•

Numerical Study on the Effect of Diesel Injection Parameters on Combustion and Emission Characteristics in RCCI Engine

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Yun-Young Ham, Sunki Min

01 Jan 2021-Journal of the Korea Academia Industrial Cooperation Society

TL;DR: In this paper, the effects of the injection timing and two-stage injection ratio of diesel fuel, a highly reactive fuel, on the performance and exhaust gas of RCCI engines using gasoline as the low reactive fuel and diesel as the high reactive fuel.

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Abstract: Low-temperature combustion (LTC) strategies, such as HCCI (Homogeneous Charge Compression Ignition), PCCI (Premixed Charge Compression Ignition), and RCCI (Reactivity Controlled Compression Ignition), have been developed to effectively reduce NOx and PM while increasing the thermal efficiency of diesel engines. Through numerical analysis, this study examined the effects of the injection timing and two-stage injection ratio of diesel fuel, a highly reactive fuel, on the performance and exhaust gas of RCCI engines using gasoline as the low reactive fuel and diesel as the highly reactive fuel. In the case of two-stage injection, combustion slows down if the first injection timing is too advanced. The combustion temperature decreases, resulting in lower combustion performance and an increase in HC and CO. The injection timing of approximately -60°ATDC is considered the optimal injection timing considering the combustion performance, exhaust gas, and maximum pressure rise rate. When the second injection timing was changed during the two-stage injection, considering the combustion performance, exhaust gas, and the maximum pressure increase rate, it was judged to be optimal around -30°ATDC. In the case of two-stage injection, the optimal result was obtained when the first injection amount was set to approximately 60%. Finally, a two-stage injection rather than a single injection was considered more effective on the combustion performance and exhaust gas.

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1 citations

Additional excerpts

...HCCI의 장점은 연소 온도가 낮아 NOx 및 PM 형성이 발생하는 당량비와 온도 영역을 피 하여 이들 배출물의 동시 저감이 가능한 것이다....
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...저온연소 전략은 HCCI(Homogeneous Charge Compression Ignition), PCCI(Premixed Charge Compression Ignition), RCCI(Reactivity Controlled Compression Ignition) 등의 신개념 연소방식으로 분 류할 수 있다....
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...RCCI방식은 HCCI나 PCCI방식보다 연소 제어에 유리하기 때문에 보다 넓은 작동영역에서 운전이 가능한 것으로 알려져 있다....
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...PCCI는 압축과정에 연료를 분 사하여 예혼합시키며 상대적으로 낮은 압력상승률 갖고 HCCI 방식보다 높은 부하조건 영역까지 확장되지만 전 부하 조건에는 역시 한계가 있다[3]....
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...이중 HCCI는 가장 먼저 연구되어온 저온 연소 전략이다....
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