NOx Reduction Strategies for DI Diesel Engines

Herzog, Peter L.; Bürgler, Ludwig; Winklhofer, Ernst; Zelenka, Paul; Cartellieri, Wolfgang

doi:10.4271/920470

Cited by 85 publications

(28 citation statements)

References 5 publications

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“…First, the effects of injection rate shaping on the combustion and emissions characteristics are investigated. Injection rate shaping provides appropriate mixing conditions of fuel and air for increased efficiency and emissions reduction while injection pressure and duration are maintained [42][43][44]. Figure 8 shows the simulation result of combustion and emissions characteristics when implementing injection rate shaping and the varying the opening rate of the injector needle to change the injection rate.…”

Section: Numerical Analysis On the Effect Of Injection Rate Shaping Omentioning

confidence: 99%

Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

et al. 2017

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Abstract:The multiple injection strategy has been widely used in diesel engines to reduce engine noise, NO x and soot formation. Fuel injection developments such as the common-rail and piezo-actuator system provide more precise control of the injection quantity and time under higher injection pressures. As various injection strategies become accessible, it is important to understand the interaction of each fuel stream and following combustion process under the multiple injection strategy. To investigate these complex processes quantitatively, numerical analysis using CFD is a good alternative to overcome the limitation of experiments. A modified 2-D flamelet model is further developed from previous work to model multi-fuel streams with higher accuracy. The model was validated under various engine operating conditions and captures the combustion and emissions characteristics as well as several parametric variations. The model is expected to be used to suggest advanced injection strategies in engine development processes.

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Section: Numerical Analysis On the Effect Of Injection Rate Shaping Omentioning

confidence: 99%

Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

et al. 2017

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“…The decrease of the BSFC was about 1-6% [1,9,10,12]. But, at full load and high-speed conditions, there was only a little increase of specific fuel consumption (Figs.…”

Section: Brake Specific Fuel Consumptionmentioning

confidence: 99%

Experimental study of NOx emissions in a low heat rejection diesel engine

Raj.P¹,

Velmurugan²

2016

IJMTER

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-In this study, an experimental study of the effects of injection timing on nitrogen oxide (NO x ) emissions of a low heat rejection (LHR) Turbo charged direct injection diesel engine was conducted. The injection timing and brake specific fuel consumption (BSFC) trade-off must be considered together in performance and NO x emissions analysis. For the original injection timing of the 20 • before top dead centre, the brake Specific fuel consumption value of the LHR engine was approximately 6% lower than the original engine. NO x emissions were also higher (about 9%) than the original engine. To reduce NO x emissions released by diesel engines, the method of injection timing retard was utilized. Thus, the LHR engine was tested for two different injection timings; 18 • and 16 • crank angle before top dead centre (BTDC), at the same engine speeds and load conditions. The results showed that the BSFC and NO x emissions were reduced 2% and 11%, respectively by retarding the injection timing. Optimum injection timing for the LHR engine was obtained through decreasing by 2 • BTDC.

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“…Other pollutions such as hydrocarbon (HC) and carbon monoxide (CO) are also present in diesel engine exhaust but not at the levels of particulate and NOx. This is why major importance has been given to decreasing emission levels and breaking the widely observed NOx-particle trade-off, i.e., without reducing the efficiency of the engine (Herzog et., Al., 1992, Erlach, H. et., Al., 1995, Needham et., Al., 1990.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on advanced injection rate measurement of a marine engine using the Zeuch method

Lee

2016

JTST

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In this study, an injection rate meter that can be used to measure marine engine nozzle injection rates is developed and the results obtained using this equipment are presented. This main focus is on differences resulting from changing the rack stroke using marine diesel oil. In addition, marine engine injection system design variables are shown to be related to by the shape of the cam profile to nozzle geometry and to the control parameters influencing the injection quantity (fuel rack position) and timing. Changing the load and fuel rack position, we calculated the injection rate by using the Zeuch method, simultaneously measuring the amount of fuel injected from the marine nozzle for 10 minutes. The difference between calculated and measured quantities is less than 1%. Comparison demonstrated the reliability of the developed injection meter. In addition, injection rate characteristics of a marine nozzle under various conditions were investigated. This study shows that it is possible to measure the injection rate and quantity of the complete marine engine using the Zeuch method

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NOx Reduction Strategies for DI Diesel Engines

Cited by 85 publications

References 5 publications

Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

Experimental study of NOx emissions in a low heat rejection diesel engine

An experimental study on advanced injection rate measurement of a marine engine using the Zeuch method

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